P2610
ECM/PCM Internal Engine Off Timer Performance
The engine controller's internal soak-time/engine-off timer fails its plausibility check — for example readings claim instant cool-down or never-cooled. Cold-start enrichment, EVAP and catalyst monitors depend on this timer; a fault freezes those readiness monitors.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: hard
Common causes
Ordered by how often each turns out to be the cause.
- ECU internal timer faultCommon
- Keep-alive memory power intermittentPossible
Parts involved
- ECM
P2610 is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.