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HP Error Code 59.F0: Meaning, Causes & Fix

HP Printer display showing 59.F0 — FixCode Guide error code graphic

Transfer alienation failure — Color LaserJet (HP's 59.F0 document: 'primarily caused by a transfer alienation failure in which the ITB is stuck and unable to rotate'; the service-manual 59.XX list defines the family as an error with one of the internal motors, and 59.F0 within it as 'Transfer alienation failure'). The intermediate transfer belt (ITB) cannot engage, disengage or rotate as the printer expects.

59.F0 is a mechanical-reporting code from the colour imaging system, and its key word is alienation — the term HP uses for moving a transfer roller into and out of contact. In a Color LaserJet, toner images are built on the intermediate transfer belt (ITB) and then transferred to paper; the primary transfer rollers must press the belt against the cartridges' drums for colour printing and retract at other times. That engage/disengage movement is the alienation mechanism, and 59.F0 reports that the printer commanded it and the mechanism did not do what the sensors say it should. HP's dedicated 59.F0 document for the CP4025/CP4525/CM4540 family gives the three causes in its own order: the ITB is stuck and unable to rotate, the SR9 sensor — the primary transfer-roller disengagement sensor, also called Sensor K — has gone bad, or the fuser drive assembly (which drives the mechanism) has failed. Around those three sits the mechanism's small moving hardware: the ITB's gear and flag, and the sensor flag/lever that tells the controller where the alienation pusher is. A second HP document line, for the CP4525 family again, shows the flag/lever stuck in the up position as the concrete failure: free it, work it a few times, reinstall the ITB and fuser and reboot — with the explicit note that the ITB itself is typically not the cause. The Pro-class machines (M452/M477 and siblings) present the same code through a different first remedy: there, HP attributes many 59.F0s to the ITB position sensor's electrical behaviour — the sensor switch develops variable resistance as it actuates — and issued a DC controller (DCC) firmware update that makes the controller tolerant of it, with a documented USB procedure to flash that DCC firmware while 59.F0 is on the screen; replacing the ITB was the earlier fix and the firmware is tried first because it is quick. These are not contradictory stories: they are one fault — the controller cannot confirm transfer alienation — reported on two hardware generations, one where the mechanism physically sticks and one where its sensor reports unreliably. 59.F0 also has numbered relatives in the same 59.XX motor family (59.A0 ITB motor rotation error, 59.C0 developer motor rotation error, 59.90 ITB motor start error and the fuser and developer motor codes), and on newer machines the same fault is logged in the xx.xx.xx event format as 59.00.F0. Read 59.F0 as 'the colour transfer system cannot prove it moved' — then find out whether it truly didn't move, or merely failed to report moving.

Applies to: HP Color LaserJet printers and MFPs with an intermediate transfer belt — verified in HP documents for the Color LaserJet CP4025/CP4525 and CM4540 families, the M750 (as 59.00.F0), and the LaserJet Pro M452/M477 family. Monochrome LaserJets have no ITB and do not produce 59.F0. The event-log rendering 59.00.F0 is the same fault in the newer format.

Safety first. Safety first: disconnect power before any internal check, and never defeat a safety switch or sensor to 'test' an appliance. LaserJet safety is dominated by two things owners underestimate: mains electricity inside the covers, and the fuser. The fuser runs hot enough to fuse toner to paper and stays hot after the printer stops — HP's own fuser-error procedure builds in a cool-down (power off and wait at least 25 minutes before retrying on a 50.X that persists) — so never reach into the fuser area to pull a jam immediately after printing, pull jammed paper gently and in the direction of travel rather than tearing it backwards, and let a printer that smells of scorching cool, powered off, before investigating. Toner is a fine powder: avoid breathing it, vacuum spills only with a toner-rated vacuum (a household vacuum's filter passes toner and its motor can be damaged by it), and wash spilled toner off skin with cold water — hot water sets it. On all HP printers: unplug before any covers-off work, never defeat cover interlocks to watch the mechanism run, and treat formatter, power-supply and fuser replacement as service work. Ink models add small cautions of their own — do not leave cartridges out of the printer for more than 30 minutes (HP's warning in its contact-cleaning steps), and never press down on a closed printhead latch on ink-tank models (HP flags this in its carriage-jam steps).

What causes the 59.F0 code on a HP printer?

The ITB is stuck and unable to rotate

HP's first named cause in its 59.F0 document: the intermediate transfer belt is physically stuck — mis-seated after a cartridge or ITB change, bound by debris in the transfer path, or its drive not engaged — so the alienation cycle cannot complete.

The sensor flag/lever is stuck or returning slowly

HP's CP4525 field document isolates this precisely: the sensor flag/lever (actuated by the ITB's primary transfer roller alienation pusher) sticks in the up position or drags on its return, so the controller reads the mechanism as never having moved. The document's verdict after freeing it: if it sticks again in a short period, inspect/replace the POSITION DETECT assembly — and 'the ITB is typically not the cause of this issue.'

The SR9 (primary transfer-roller disengagement) sensor has failed

HP's diagnostic endpoint for the sensor branch: run the MANUAL SENSOR TEST, actuate the SR9 flag by hand and watch the control panel — the sensor value (under K) must toggle between 0 and 1 (0 is the normal state). A sensor that does not toggle is replaced. Its connectors are part of the same check: SR9 at connector J19, and the DC controller PCA at J128 on the CP4525 family.

The ITB position sensor's electrical behaviour (Pro M452/M477 generation)

On the Pro-class machines HP's explanation is a sensor switch inside the ITB assembly whose resistance varies as it is activated, confusing the DC controller about whether the belt has been pressed into contact for colour printing. HP's remedy was a new DC controller firmware that ignores the faulty behaviour — which is why a firmware update, not a part, is the documented first fix on these models.

The fuser drive / main drive assembly has failed

The drive assemblies turn the mechanism the sensors watch. HP's documents end both diagnostic branches here: if SR9 tests good on a CP4525-family machine, 'the error would then be the result of the fuser/transfer drive assembly not rotating the belt — replace the fuser drive assembly'; the M750 document's equivalent branch replaces the fuser drive assembly (or the main drive assembly where its T1 alienation switch test fails).

Checks to run before you replace anything

Note exactly when 59.F0 appears: at power-on during initialisation, at calibration, or after a few pages of colour printing (the Pro-family reports cluster at 'after printing 4 or 5 pages'). Timing plus model tells you which HP document line you are in — mechanism-stick (Enterprise) or sensor-reporting (Pro DCC firmware).
Power off, remove and reseat the ITB, exactly as HP's document orders it (its step 1 on both the CP4525 and M750 lines). A surprising share of 59.F0s are an ITB that was refitted slightly out of home after cartridge work.
With the ITB removed, manually test the ITB gear and flag as HP directs: rotate the gear and check that the flag actuates when the white gear is turned. A broken or damaged flag, or a flag that does not move, convicts the ITB itself — that is HP's stated replacement condition.
Run the MANUAL SENSOR TEST (Diagnostics/Troubleshooting menu) and actuate the SR9 flag by hand from inside the ITB/fuser cavity while watching the display: the K value must toggle between 0 and 1. No toggle = replace the sensor (HP documents the sensor and its connectors — J19 at the sensor, J128 at the DC controller — as the check order). Also check those connectors are fully seated before condemning the sensor.
Look for the stuck flag/lever with the fuser removed, per HP's CP4525 document: the sensor flag/lever sits in its holder on the left (front) side; if it is stuck in the up position, free it carefully with your fingers and actuate it a few times to be sure it is loosened, then reinstall the ITB and fuser and reboot before ordering anything.
On Pro M452/M377/M477 models, check the DC controller firmware revision before any mechanical work: print a configuration report and compare the DCC revision against HP's documented update for the 59.F0 issue (the HP procedure updates DCC from a USB thumb drive via the front USB port, even with 59.F0 displayed). An un-updated DCC on these models makes sensor hardware verdicts premature.

How to fix hp error code 59.f0?

Reseat the ITB and reboot — HP's first action on every documented branch. If the error clears and stays cleared through colour calibration and a colour job, the ITB was simply out of home.
Free a stuck sensor flag/lever (fuser removed, work the flag by hand until it moves and returns freely), reinstall the fuser and ITB, and reboot. HP's condition for escalation: if the error returns in a short period, the flag is dragging or sticking again — remove the top cover, inspect the POSITION DETECT assembly to confirm its photo interrupter is seated correctly, check the flag's movement, and replace the POSITION DETECT assembly if it still misbehaves.
On Pro M452/M477-class machines, flash the DC controller (DCC) firmware update first, exactly per HP's procedure (the .prn update file on a FAT32 USB drive in the front port, printed via USB > Print Documents; the printer reboots itself after roughly 3-5 minutes, and the configuration report should then show the updated DCC revision). HP's field experience behind the update: it resolves the sensor-reporting 59.F0s that previously led to ITB replacements.
Replace the ITB only on HP's stated conditions: its gear/flag test fails (flag broken, damaged, or not actuating when the gear turns). An ITB that passes its gear-and-flag test is, per HP, typically not the cause — replacing it first is the expensive way to learn that.
Replace the SR9 sensor if the Manual Sensor Test shows it does not toggle 0/1 with its connectors proven seated. Note the M750 variant honestly: on that model HP's document routes a failed T1 alienation switch (SW5) test to the main drive assembly instead — follow your own model's document, not another family's.
Replace the drive assembly last, per HP's order: fuser drive assembly (CP4525/M750 lines) when the sensor tests good and the belt demonstrably is not being rotated/engaged; main drive assembly on the M750 where its switch test directs there. Drive replacement is covers-off service work — if the diagnostics above are beyond the machine's owner-serviceable design, this is the hand-off point to a technician, with your sensor-test results as the brief.

The part that usually fails: The part depends on which test fails — HP's order is flag/lever and POSITION DETECT assembly, SR9 sensor, ITB (only on a failed gear/flag test), then the fuser/main drive assembly; on Pro models the 'part' is usually a firmware file

HP's documents are unusually explicit about parts discipline here: the ITB is typically NOT the cause, and it is replaced only when its own gear-and-flag test fails. The sensor-side parts are the POSITION DETECT assembly (photo interrupter + flag, CP4525 family) and the SR9 sensor itself (HP documents its part number in the service procedure). Drive assemblies (fuser drive; main drive on M750) are the last resort after sensor tests pass. Part numbers for your exact model come from its service manual/parts list — they differ between the CP4525, M750 and Pro families and are not interchangeable.

How to reset / clear the 59.F0 code

59.F0 has no software reset and no button sequence: it clears when the printer next runs its alienation check and the mechanism reports correctly. The documented recovery motions are the power cycle after reseating the ITB (power off, reseat, power on and let it initialise through calibration) and, on the Pro models, the DCC firmware update's automatic reboot. A 59.F0 that returns at the next calibration or the next colour job has not failed to reset — the alienation check has failed again, and the checks above, not more power cycles, are the next step.

HP's documented reset for its printers is a power reset, and HP repeats the same procedure in document after document (ink-system errors, blue screens, E6/E8 states, event codes): with the printer turned on, disconnect the power cord from the rear of the printer; unplug the power cord from the power source; wait at least 60 seconds; reconnect the power cord to a wall outlet and to the printer — HP expressly recommends plugging the printer directly into a wall outlet rather than a surge protector or power strip — then turn the printer on and wait until it is idle and silent. For ink models HP's ink-system flow adds one step before the reset: remove the ink cartridges first, perform the power reset, and only reinsert the cartridges after the printer powers back on, printing a calibration/alignment page if prompted. Two things a power reset is not: it is not a factory restore (on touchscreen models that is a separate, documented action — Setup > Printer Maintenance > Restore > Restore Factory Defaults — which returns settings to defaults and is HP's step for persistent firmware-crash screens, not a first move), and it is not a cure for a standing fault. Any code whose cause is still physically present — a jammed sheet, a stalled carriage, a failed printhead, a transfer belt that cannot move — is re-detected at the next self-check and returns, which is the printer working as designed.

Why does the 59.F0 code keep coming back?

A 59.F0 that returns within days of being freed is the flag/lever pattern HP describes: it drags and returns slowly, or sticks again — escalate from freeing it to inspecting/replacing the POSITION DETECT assembly rather than freeing it weekly. A return on a Pro model that never had the DCC update is the firmware pattern: flash it before replacing anything. A return immediately at power-on after a full pass of sensor tests points down the drive chain (fuser/main drive). And a 59.F0 that only ever follows cartridge or ITB removal is a seating pattern — the ITB's home position and its flag are being disturbed by the refit, so slow down on the reseat before suspecting parts.

Can you still use the printer with 59.F0 showing? No — 59.F0 stops the colour imaging system: the printer cannot trust its transfer belt position, so colour printing (and on most models printing generally) halts until the alienation check passes. It is not a run-and-monitor code; every power-on and calibration re-runs the failing check.

How to stop 59.F0 coming back

The ITB is stuck and unable to rotate: HP's first named cause in its 59.F0 document: the intermediate transfer belt is physically stuck — mis-seated after a cartridge or ITB change, bound by debris in the transfer path, or its drive not engaged — so the alienation cycle cannot complete.
The sensor flag/lever is stuck or returning slowly: HP's CP4525 field document isolates this precisely: the sensor flag/lever (actuated by the ITB's primary transfer roller alienation pusher) sticks in the up position or drags on its return, so the controller reads the mechanism as never having moved. The document's verdict after freeing it: if it sticks again in a short period, inspect/replace the POSITION DETECT assembly — and 'the ITB is typically not the cause of this issue.'
The SR9 (primary transfer-roller disengagement) sensor has failed: HP's diagnostic endpoint for the sensor branch: run the MANUAL SENSOR TEST, actuate the SR9 flag by hand and watch the control panel — the sensor value (under K) must toggle between 0 and 1 (0 is the normal state). A sensor that does not toggle is replaced. Its connectors are part of the same check: SR9 at connector J19, and the DC controller PCA at J128 on the CP4525 family.

When to call a pro. Book service if: the Manual Sensor Test or component tests are not accessible on your model or you are not equipped for covers-off work; the SR9 sensor or a drive assembly is convicted (both are internal replacements); the error survives the DCC firmware update on a Pro model AND a clean ITB gear/flag pass; or the printer is under warranty — HP's community guidance for 59.F0 is to call it in under warranty rather than open the machine. Hand over the exact code (59.F0 vs 59.00.F0), when it occurs, and your sensor-test results.

Retrieving stored fault codes on HP printers

How an HP code reaches you depends on the family's display. LaserJets with text displays show the code and a short instruction on the control panel ('49 Error — Turn off then on', '13.XX Jam in <location>'), and newer LaserJet/MFP models log the fuller xx.xx.xx event form of the same fault: the panel may show the short form while the event log holds the long one (an MFP can hang at the logo with 49.4C02 visible only in the Embedded Web Server, per HP's own document). HP documents event-log retrieval on LaserJets through the printer's menus: older models PRINT EVENT LOG / SHOW EVENT LOG from the Information or Service menu (the printed log lists the most recent events — 50 on the 4200/4300-era machines — with error number, page count at the time of the error, and description/personality, and the configuration page itself carries the last three event-log entries); Enterprise models print the event log from the Troubleshooting/Diagnostics menu, and the same history is visible in the Embedded Web Server. Ink OfficeJets with touchscreens show the 0x code or event code together with a plain-language message ('Ink System Failure', 'There is a problem with the printhead'), and the HP Smart app mirrors the message with more detail. Display-less DeskJet/ENVY models cannot show any of that: they encode the fault as a blinking letter E plus a digit in the copies display, with the Resume and Ink Alert lights blinking in documented combinations — on those models the light pattern is the code, and HP's user guides and its 'Blinking lights and error codes' support documents are the decoder. Practical rule: photograph or write down the code exactly as shown, including suffixes and which lights blink — HP's troubleshooting is keyed to the exact form.

Other HP printer error codes

Code	Meaning	First fix
0x83C0000A	NOS_LOADER_APP firmware/bootloader failure — OfficeJet 4630-era ink models (the display shows 'ERROR CODE 0x83C0000A NOS_LOADER_APP'): HP's support answers define it consistently as a critical firmware boot error — firmware corruption or bootloader failure, so the printer cannot load its operating system	Hard reset first (disconnect power while on, wait 60 seconds, reconnect directly to a wall outlet). If the model supports it, attempt firmware recovery via the HP Firmware Update Utility over USB. HP's prognosis is honest: a 0x83C0000A that survives reset and recovery usually means the system board cannot load firmware at all — service or replacement
0xC4EB827F	Internal system failure — ENVY 4500-series ink models (HP's Knowledge Base troubleshooting for 0xC4EB827F associates it with printhead/ink-system malfunction, an electrical or firmware communication issue inside the printer, carriage/paper-movement obstruction, or a sudden interruption during a print cycle). HP publishes no narrower per-code definition	HP's flow: confirm the correct genuine cartridges for the model/region, load plain paper, open the cartridge access door, wait for the printer to go idle, remove and reseat each cartridge (colour left, black right on the ENVY 4500), and power-reset. A code that returns after reseating and reset is an internal-failure service case
0xC19A0003	Printhead Failure — OfficeJet Pro 6978 ink models (the code is displayed with 'Printhead Failure'): a hardware issue with the printhead or its connection to the printer	Restart with a full power reset; remove the cartridges and clean the printhead and cartridge contacts with a lint-free cloth dampened with distilled water, let them dry 5-10 minutes, refit; update firmware. A 0xC19A0003 that survives cleaning and firmware is a printhead replacement/service case
0xC19A0013	Ink System Failure — OfficeJet 6500A-era ink models: a member of the same 0xC19A ink-system family as 0xC19A0020, reported with ink-system failure behaviour including loss of a colour (black) channel	Work the family's HP flow: reseat cartridges, run the automated printhead cleaning, clean the printhead manually if the code persists, and power-reset the printer. HP community guidance for this code is blunt: a printhead already replaced once that returns to 0xC19A0013 points to a failed printer needing service
0xC19A0015	'The printhead appears to be missing, not detected, or incorrectly installed' — OfficeJet Pro 8610/8730 ink models: a printhead detection failure	Full power reset (unplug from printer and wall, wait at least 60 seconds, plug directly into a wall outlet); remove cartridges, lift the printhead latch, remove and inspect the printhead, clean its gold contacts with a lint-free cloth slightly dampened with distilled water, reseat firmly, refit cartridges, update firmware. Persistent = printhead/service
0xC19A0020	Ink System Failure — Photosmart/ink models (the display pairs the code with 'Ink System Failure ... Please turn printer off and then on'): the ink system/printhead has faulted	HP's flow (support document c03081973 family): update firmware, clean the printhead (automated tool, then manually if needed), check cartridges are vented and seated — then remove the cartridges and reset the printer (printer on, disconnect power, unplug, wait at least 60 seconds, reconnect to a wall outlet, power on, reinsert cartridges, align if prompted). Persistent 0xC19A0020 = service or replace the product
0xC19A0022	'Ink system has failed' — ink models: a member of the 0xC19A ink-system family (displayed as 0xC19a0022 with the ink-system-failed message)	HP's steps for this code: verify every cartridge is correctly installed and snapped firmly into place (press down a cartridge that sticks out farther than the others), then clean the electrical contacts — cartridge copper contact and the contacts inside the printhead, one cartridge at a time, with a lint-free cloth — and power-reset. Persistent = service
10	Supply memory error — LaserJet (P2055-era user guides: '10.X Supply memory error — the e-label for the print cartridge cannot be read or is missing'; the M9040/M9050 service manual renders it 10.10 with the same sense, and the current Enterprise table renders the family 10.WX.YZ 'Supplies — supply error or supply memory error'): the printer cannot read or write to at least one cartridge's memory tag, or a tag is missing. On colour models the suffix identifies the cartridge (the 4700-era table: 10.00.00 = black, .01 cyan, .02 magenta, .03 yellow)	Reinstall/reseat the cartridge and turn the printer off and then on; clean the cartridge chip and slot contacts. Press OK to override and keep printing where the model offers it (supplies and status features stay unavailable). If the error follows the cartridge, replace the cartridge; if it stays with the slot, the contacts/reader are service
11	Paper out — legacy LaserJet (II/III/4-era service literature): the paper tray is empty. Do not confuse with the newer rendering 11.XX, which HP's M3027 user guide defines as an internal real-time clock error (set date/time after each power-on; persistent = formatter)	Load paper and seat the tray fully. Still showing 11 with paper loaded = paper-present sensor/flag check, service territory. An 11.XX clock error instead needs date/time reset, then formatter service if it persists
12	Printer open — legacy LaserJet (II/III/4-era): the top cover is not correctly closed, or the toner (EP) cartridge is not correctly installed; on IIP/IIIP/4P-era models the same message also covers a missing/defective cartridge or a non-running cooling fan	Reseat the cartridge until it sits fully, then close the cover firmly. HP's legacy note: plugging a 220V model into a 120V supply can also produce this message. Persistent 12 with cover and cartridge proven = service
13	Paper jam — LaserJet across generations, the jam family head: legacy displays read '13 PAPER JAM' (paper is jammed inside the printer); newer guides add a location suffix ('13.XX Jam in <location>' in the P2055 guide; current Enterprise models use 13.WX.YZ and 13.B2-style codes naming the tray, door or fuser area — see the 13.B2.D2 row; the current repair-manual table heads the family '13.WX.YZ — Jam: paper jam or open door jam error'). Never read it with an ink-model table	Clear the jam from the location indicated (trays, top-cover/cartridge area, rear door, duplexer or fuser area, as the model directs), removing every torn scrap, reload paper correctly and resume or reprint the job. A 13 that persists with a proven-clear path is a sensor-flag/roller check — service territory
13.B2.D2	Jam in Tray 1 (the multipurpose tray) — newer LaserJet xx.xx.xx event format (LaserJet Enterprise 8601 user guide lists '13.B2.A1, 13.B2.D2 jam error in tray 1 (multipurpose tray)'; the 13.B2 family is the registration/top-cover jam family, with the final group naming the tray/location)	Follow the control-panel animation: remove the jammed paper from Tray 1 (open the right door if it will not come from the tray), check tray guides are set to the loaded size and the tray is not overfilled, then open and close the front door to resume. If the error persists with a clear path, clean the Tray 1 rollers; a sensor fault after that is service
14	No EP cartridge — legacy LaserJet (II/III/4/5-era): no toner cartridge is detected in the printer	Install/reseat a cartridge and confirm it clicks home. Check the cartridge's sensing tab (legacy models) and clean/check the high-voltage contacts; a cartridge still not seen after that points at the high-voltage power supply — service
16	Toner low — legacy LaserJet (II/III/4/5-era): the toner cartridge is running low on toner	Rock the cartridge gently side to side to redistribute toner for a short reprieve (HP-era guidance puts it at roughly 50-100 pages), and fit a new cartridge soon. A 'low' reading on a fresh cartridge = contacts/connector check

See the full list on the HP Printer error codes hub.

Codes 59.F0 gets confused with

49 — Critical firmware error — LaserJet (HP's service-manual wording for 49.XXXX: 'A critical firmware error has occurred that caused the processor on the formatter to abort operation'). The printer's formatter has crashed; the display typically reads '49 Error — Turn off then on' or a suffixed form such as 49.4C02. Error 49 is the LaserJet family's firmware crash report, and understanding what crashed is the whole diagnosis.

Frequently asked questions

What does HP error code 59.F0 mean?

HP's definition: a transfer alienation failure. The Color LaserJet's intermediate transfer belt (ITB) must engage and disengage its primary transfer rollers ('alienation') for colour printing; 59.F0 means the printer commanded that movement and could not confirm it — HP's document gives three causes: the ITB stuck and unable to rotate, the SR9 disengagement sensor gone bad, or the fuser drive assembly failed. On Pro M452/M477 models, HP's first fix is a DC controller firmware update for the sensor's behaviour.

How do I fix HP error 59.F0?

In HP's documented order: (1) power off, reseat the ITB, reboot; (2) with the ITB out, turn its gear by hand and confirm the flag actuates — a broken or non-moving flag means replace the ITB; (3) run the Manual Sensor Test and actuate the SR9 flag — it must toggle 0/1 on the display, or the sensor (check connectors J19/J128 first) is replaced; (4) check for the sensor flag/lever stuck up in its holder (fuser removed), free and work it — recurrence means the POSITION DETECT assembly; (5) on Pro M452/M477 machines, flash HP's DCC firmware update before mechanical parts; (6) sensor good + belt not rotating = fuser drive assembly. Do not start by replacing the ITB — HP states it is typically not the cause.

What is 59.00.F0 — is it different from 59.F0?

No. 59.00.F0 is the same transfer alienation failure written in the newer xx.xx.xx event-code format (it appears in HP's troubleshooting for the M750 in exactly that form, with the same fix order: verify the ITB is correctly installed, test the T1 roller alienation switch SW5 in the Manual Sensor Test, test the T1 engagement/disengagement drive in the Component Test). Quote whichever form your printer shows; the diagnosis is identical.

Is the ITB itself faulty when I get 59.F0?

Usually not — HP's own field document says so in as many words ('The ITB is typically not the cause of this issue'), and its diagnostic gives the ITB exactly one conviction route: remove it, rotate its gear, and if the flag is broken/damaged or does not actuate, replace the ITB. A belt that passes that test should stay in the printer while you test the SR9 sensor, the flag/lever and (on Pro models) the DCC firmware.

What are 59.A0 and 59.C0 — relatives of 59.F0?

Yes: they are members of the same 59.XX internal-motor family in the service-manual list. 59.A0 is an ITB motor rotation error and 59.C0 is a developer motor rotation error (the same list carries 59.90 ITB motor start error and the fuser motor codes 59.30/59.40). They are drive/motor faults in adjacent mechanisms, not alienation faults: a printer showing 59.A0 or 59.C0 is reporting that a motor failed to rotate, so the alienation-specific checks (flag/lever, SR9 disengagement sensing) do not apply — those codes follow their own motor/drive diagnosis and are service work.

My M477 shows 59.F0 after a few pages, then clears on reboot. Why?

That is the Pro-family pattern HP documented: the ITB position sensor switch develops variable resistance as it actuates during operation, so the DC controller intermittently loses track of the belt's engagement and raises 59.F0 mid-run; a reboot passes the startup check until the sensor misreports again. HP issued a DC controller (DCC) firmware update specifically to make the controller ignore this behaviour, applied via the front USB port even with 59.F0 displayed — HP's guidance is to flash that update first, ahead of the ITB replacement that was the earlier fix.

What is hp error code 59.f0?

How to fix hp error code 59.f0?

Start here: Reseat the ITB and reboot — HP's first action on every documented branch. If the error clears and stays cleared through colour calibration and a colour job, the ITB was simply out of home. Free a stuck sensor flag/lever (fuser removed, work the flag by hand until it moves and returns freely), reinstall the fuser and ITB, and reboot. HP's condition for escalation: if the error returns in a short period, the flag is dragging or sticking again — remove the top cover, inspect the POSITION DETECT assembly to confirm its photo interrupter is seated correctly, check the flag's movement, and replace the POSITION DETECT assembly if it still misbehaves.