P050DCold Start Rough Idle
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- GM's direct-injection petrol engines (from about 2016) split the injection into two pulses and retard the ignition after a cold start to heat the catalyst. P050D counts engine cycles with incomplete combustion via the crankshaft misfire detection during this strategy; if the rate reaches the catalyst-damaging misfire threshold, the code sets – once per trip, while the strategy is active (under 45 s running, coolant up to 66 °C). Mostly MIL after two trips, some calibrations without MIL. Ford and FCA do not use P050D.
- What you may notice
- Check engine light on (depending on calibration)
- Rough idle or jerking in the first seconds after a cold start
- Usually unremarkable when warm
- Likely causes
- LikelyInjector with poor spray pattern or deposits, or injector circuit fault
- PossibleSpark plug or ignition coil weak
- PossibleEngine module software or calibration
- RarePoor fuel or low fuel pressure
- 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: €0 – €800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.