P0A0F
Hybrid Engine Failed to Start
The hybrid control system commanded an internal combustion engine start that did not complete within the expected time. Causes range from low 12V supply to fuel, ignition or starter issues.
- Check engine light: Yes
- Emissions related: Yes
- Repair difficulty: hard
Common causes
Ordered by how often each turns out to be the cause.
- Weak 12V auxiliary batteryCommon
- Starter or ignition system faultPossible
- HV battery state of charge insufficientLess likely
Parts involved
- Hybrid Control Module
- Engine Starter
- Hv Battery
P0A0F is a generic OBD-II code defined by SAE J2012. Exact wording and diagnostic procedure vary by manufacturer and model. Code definitions are drawn from the public-domain OBDex dataset; the workshop notes are our own.