P0655: Engine Hot Lamp Output Control Circuit
What to do
Driveable, but you may no longer be warned about overheating. If the vehicle has a temperature gauge, watch it; if it does not, treat this as worth fixing promptly — overheating without warning is one of the most expensive things that can happen to an engine.
What this code means
A fault in the circuit driving the engine overheating warning lamp. Like the other lamp faults this changes nothing about how the engine runs, but it removes a warning — and this is the warning whose absence is most expensive, since overheating destroys head gaskets and cylinder heads quickly and silently.
On a vehicle without a temperature gauge, that lamp is the only indication there is.
Likely causes
Start here
- Blown warning lamp bulb · easy
- Broken wire in control circuit · moderate
- Corroded or loose connector · easy
Less common
- Failed instrument cluster · specialist
Symptoms
Components involved
Information, not instruction
CarGeek is a reference, not a service manual. Its pages are written from public sources and from what other people have found, never from a manufacturer's own service information, so they can be wrong or incomplete for your particular vehicle. Some of what they describe carries real risk: high voltage, fuel under pressure, stored energy, hot and moving parts.
Have anything you intend to act on checked by a trained person against the manufacturer's own procedure for your vehicle. Nothing here replaces that procedure.
Community experience
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What makes one worth reading:
- The car — make, model, year and engine. The same fault behaves differently on each.
- What you measured, not only what you replaced.
- What actually fixed it — or that nothing did, which is worth knowing too.
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