P05EC
Cold Start Injection Timing Performance
During cold-start the ECU adjusts injection timing (post-injection on diesels, intake-stroke timing on direct-injection petrols) to support catalyst light-off. The strategy does not deliver the expected timing - injector response slow or sensor offset.
During cold-start the ECU adjusts injection timing (post-injection on diesels, intake-stroke timing on direct-injection petrols) to support catalyst light-off. The strategy does not deliver the expected timing - injector response slow or sensor offset.
Common causes
- high
Injectors slow when cold
One of the most commonly reported causes for this code — check this first.
Typical part cost: $220-1650
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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.
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Related codes
See related trouble codes
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Frequently asked questions
What does P05EC mean?
P05EC means "Cold Start Injection Timing Performance". 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 P05EC?
injectors slow 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.
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