Powertrain
generic / SAE
P050A
Cold Start Idle Control System Performance
During the cold-start phase the ECU runs an elevated idle speed and a richer mixture to bring the catalyst above light-off temperature quickly. The cold-start idle does not behave as commanded - speed sags, hunts, or fails to come up. Possible causes are intake leaks active when cold, an IAC valve sticking, or implausible coolant temperature.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number5 / 0A
Possible causes
- Intake leak only when cold (gasket shrinks) high
- IAC valve sticking when cold medium
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 120–600 €
- Estimated time: 0.8–2.5 h
- Component: idle air control valve
- Component: cold start strategy
- Component: intake manifold seal
- MIL / check engine light
- emissions-relevant
Sources
References
sae:J2012