OBD-II code · Powertrain (generic)
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.
Is it safe to drive with P050A?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyIntake leak only when cold (gasket shrinks)
- PossibleIAC valve sticking when cold
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.8–2.5 h
- Emissions test
- Likely to fail
- Parts involved
- Idle Air Control Valve, Cold Start Strategy, Intake Manifold Seal
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.