P2610: ECM/PCM Internal Engine Off Timer Performance — what it means, the affected system and what to check before replacing parts.
Meaning, symptoms, causes and checks
The internal timer used by ECM/PCM to track an engine-off period has failed its performance check. It is not a timing-chain or camshaft correlation code. The controller-specific time-retention monitor must be identified before concluding that hardware needs replacement.
Affected system: Controller timing and retained state
Symptoms
- The engine warning may be on despite apparently normal driving.
- Starting irregularities or accompanying electrical codes may occur.
Possible causes
- Intermittent battery supply or unreliable ECM/PCM power or ground connections.
- A module timing/software fault is possible only after checking the external circuits.
What to check
- Confirm P2610 and retain any accompanying codes.
- Check battery terminals and ECM/PCM power and ground circuits for intermittent loss.
- Consult vehicle-specific service information and software bulletins before diagnosing the controller.
Also written as: P2610-00, P261000 (some scan tools add the fault-type byte, e.g. -00).