P02FFPropulsion System Inactive Timer Performance
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- How the car detects it
- Many diagnostics need to know how long the engine – or, on hybrids, the whole propulsion system – has been off: thermostat and evaporative checks and the cold-start strategy, for which CARB requires at least 6 hours of standstill. A timer measures this time, and the engine module checks its plausibility, for example against coolant cooling – a GM patent describes such a check. P02FF means that timer is implausible. Mercedes documents it on M256, M260, M264 and M274 engines of around 2020: after an internal reset the instrument cluster clock ran wrong; the fix is a software update for engine, transmission and instrument cluster modules. Readiness of standstill-dependent monitors may stay incomplete.
- What you may notice
- Check engine light on, otherwise usually nothing noticeable
- Clock in the instrument cluster wrong or reset
- Readiness of standstill-dependent monitors incomplete
- Likely causes
- LikelyTime source in another module (instrument cluster, body module) gives an implausible time after a reset or voltage loss
- LikelySoftware level of engine, transmission or instrument cluster module
- PossibleBattery discharged or disconnected, voltage dips
- RareInstrument cluster or timer in the engine module faulty
- RareCoolant temperature sensor distorting the cooling check
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €900
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.