Powertrain
generic / SAE
P050B
Cold Start Ignition Timing Performance
During cold-start the ECU retards ignition timing to raise exhaust temperature for catalyst light-off. The strategy does not deliver the expected timing - feedback from knock sensor or combustion model shows ignition too far advanced or retarded for the demanded calibration.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number5 / 0B
Possible causes
- Knock sensor drift causes wrong feedback high
- Cam phaser offset against crank medium
Inspection / repair
- Difficulty: medium
- DIY: shop recommended
- Estimated cost: 200–800 €
- Estimated time: 1–3 h
- Component: ignition timing strategy
- Component: knock sensor
- Component: cam position sensor
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012