P0A09DC/DC Converter Status Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Can trigger limp mode
- How the car detects it
- The status signal that the DC/DC converter sends to the hybrid control module stays below its expected range, typically from a short to ground, an open line read as low, or a converter that pulls its status output down because of an internal fault. Mitsubishi uses P0A09 on the 2012-2013 i-MiEV for a DC-DC converter fault; its bulletins tie it to a failed on-board charger that blows the high-voltage fuse feeding the converter, after which the 12 V battery and drive battery stop charging. That usage predates the current split into P0A08, P0A09 and P0A10. Siblings: P0A08 covers the general circuit fault, P0A10 a signal stuck high. Expect warning lights and a 12 V battery that slowly runs flat.
- What you may notice
- Power unit, battery or hybrid warning light on
- 12 V battery not charged, voltage drops
- On EVs the drive battery may also stop charging
- Likely causes
- LikelyBlown high-voltage fuse feeding the converter, e.g. after an on-board charger failure (Mitsubishi i-MiEV)
- PossibleDC/DC converter internal fault pulling the status output low
- PossibleStatus line shorted to ground or chafed harness
- RareFaulty input stage in the hybrid/EV control module
- Repair
- Hard · Usually a job for a workshop.Typical cost: €100 – €2,000
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.