P0655 code meaning
Engine Hot Lamp Output Control Circuit
What P0655 means
The engine module switches this hard-wired output with its own driver and checks the circuit electrically (open, short to ground or voltage) – it cannot see whether the lamp lights; on CAN-based cars such faults appear as U codes. P0655 concerns the engine hot or coolant warning lamp that the engine module switches by wire from the coolant temperature signal. CARB links overtemperature protection strategies to this lamp: a protective reaction that only starts after the hot lamp lights needs no MIL. No manufacturer document available to us uses this code; the description follows CARB and the component. If the circuit fails, the driver may not be warned of overheating – check it promptly even though the check engine light usually stays off. Actual overheating is P0217; the coolant sensor circuit is P0117/P0118.
P0655 at a glance
- Check engine lightUsually not
- Emissions testNot an emissions code
- Limp modeNot expected
- Repair difficultyMedium
- Typical labor0.5 to 2 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0655
- Temperature warning lamp does not light at bulb check or when overheating
- Warning lamp stays on without overheating
- Code stored, check engine light depending on the maker
Common causes of P0655
- Most likelyWire or connector between module and receiver open, corroded or shorted
- PossibleBulb/LED or instrument cluster faulty
- PossibleLamp supply missing (fuse)
- Less likelyOutput driver in the module faulty
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Engine hot lampInstrument clusterLamp control circuit
What each part of P0655 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| 6 | Area: computer (engine control module) and output circuits. |
| 55 | The exact fault in that area. |
What to do next
- Note P0655 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0655
What does P0655 mean?
P0655 means "Engine Hot Lamp Output Control Circuit". The engine module switches this hard-wired output with its own driver and checks the circuit electrically (open, short to ground or voltage) – it cannot see whether the lamp lights; on CAN-based cars such faults appear as U codes. It is a generic code, so it means the same on every make.
Is it safe to drive with P0655?
P0655 does not normally turn on the check engine light by itself. Watch for the symptoms above and have it checked soon.
Will P0655 fail an emissions test?
P0655 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is P0655 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2 hours of work. This is a job for a workshop.
Will P0655 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.