OBD-II code · Powertrain (generic)
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.
Is it safe to drive with P05EC?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyInjectors slow when cold
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–5 h
- Emissions test
- Likely to fail
- Parts involved
- Fuel Injectors, Cold Start Strategy
Related codes
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.