P050D
Cold Start Rough Idle
The ECU detects rough idle behaviour during the cold-start phase only. Once the engine has warmed up the issue disappears. Typically caused by injector deposits, low compression on one cylinder when cold, or sticky valve guides.
The ECU detects rough idle behaviour during the cold-start phase only. Once the engine has warmed up the issue disappears. Typically caused by injector deposits, low compression on one cylinder when cold, or sticky valve guides.
Common causes
- high
Injector tip coked - poor cold spray pattern
One of the most commonly reported causes for this code — check this first.
Typical part cost: $90-660
- medium
Valve guide sticky when cold
A plausible cause — test and verify before replacing parts.
Typical part cost: $90-660
See all causes + fix costs
Create a free Wrenchify account to unlock the rest for P050D.
Unlock causesFree forever · No credit card
First things to check
- 1Confirm the code with a scan tool and check for additional related codes.
- 2Inspect the relevant sensors, wiring, and connectors for damage or corrosion.
Get the full step-by-step diagnosis
Create a free Wrenchify account to unlock the rest for P050D.
Unlock diagnosisFree forever · No credit card
Related codes
See related trouble codes
Create a free Wrenchify account to unlock the rest for P050D.
Unlock related codesFree forever · No credit card
Frequently asked questions
What does P050D mean?
P050D means "Cold Start Rough Idle". It is a generic OBD-II code that points to a fault in the vehicle speed, idle control, auxiliary inputs.
What are the most common causes of P050D?
injector tip coked - poor cold spray pattern; valve guide sticky when cold — these are the most commonly reported causes. Verify with a proper diagnosis before replacing parts, or use the Wrenchify app for a vehicle-specific diagnosis.
Can I keep driving with this code?
The vehicle is usually drivable for short distances, but the problem can worsen or affect emissions. Diagnose and repair as soon as practical. Use the Wrenchify app for a full diagnosis specific to your vehicle.
Get the full P050D diagnosis for your vehicle
Year, make, model + step-by-step repair help — free plan included.