OBD
P050D
Cold Start Rough Idle
What it means
P050D means Cold Start Rough Idle.
Check these first
- A dirty idle air control valve
- A failed engine coolant temperature sensor
- Leaking or clogged fuel injectors
- A vacuum leak on the intake
What to do next
- Watch cold start misfire counters on a scan tool
- Clean the idle air control valve and throttle body
- Check the coolant temperature sensor reading when cold
- Check for a vacuum leak and dirty injectors
- Clear the code and retest
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Updated
Generic SAE J2012 definition. Last updated 2026-10-10.