P0A0F
- Powertrain
- Generic (SAE)
- Emissions
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Driving may cause further damage or leave you stranded. Arrange service promptly rather than waiting.
Hybrid Engine Failed to Start
This code is in our catalogue but has not yet been through editorial review, so the guidance below is limited to what our structured data supports. We publish deeper diagnostic content only after a code has been reviewed — here is why.
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.
A trouble code records what a control module measured. It does not identify which part failed. Test before replacing anything.
- Safe to drive
- Driving may cause further damage or leave you stranded. Arrange service promptly rather than waiting.
- Urgency
- Get it looked at now
- Will it pass emissions
- No
- Check engine light
- Solid
| # | Cause | How often | Component |
|---|---|---|---|
| 1 | Weak 12V auxiliary battery | Very common | — |
| 2 | Starter or ignition system fault | Common | — |
| 3 | HV battery state of charge insufficient | Occasional | — |
Ordering reflects how often each cause is responsible in general, not a probability for your vehicle. Confirm by testing.
- Hybrid Control Module
- Engine Starter
- HV Battery
- Definition
- Generic code set (SAE J2012 / ISO 15031-6) via the OBDexopen database, dedicated to the public domain under CC0-1.0.
- Diagnostic guidance
- Written and reviewed in-house. See our editorial policy.
- Review status
- Awaiting review
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