P0A08DC/DC Converter Status Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Can trigger limp mode
- How the car detects it
- General fault on the status line through which the DC/DC converter reports its condition to the hybrid control module. The converter replaces the alternator: it steps the traction battery voltage down to charge the 12 V battery. When its self-diagnosis detects an internal problem it signals this back, and the controller reacts. P0A08 is the broad verdict for an unusable or implausible status signal; a signal stuck low or high has its own codes P0A09 and P0A10. No manufacturer documents P0A08 publicly in an official source. Toyota's Prius c recall shows the consequence of a dead converter: warning lights, then a draining 12 V battery that can shut the hybrid system down. Drivers should not keep driving for long.
- What you may notice
- Hybrid system, battery or master warning light on
- 12 V battery is no longer charged and voltage drops while driving
- Electrical consumers fail and the hybrid system may finally shut down
- Likely causes
- LikelyInternal fault in the DC/DC converter reported by its self-diagnosis
- PossibleDamaged or corroded status line or connector between converter and hybrid control module
- RareConverter overheating due to a fault in the inverter/converter coolant loop
- RareFaulty input stage in the hybrid control module
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €1,800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.