P0A09 code meaning
DC/DC Converter Status Circuit Low
Powertrain system Generic code P0Axx codes Check engine light
What P0A09 means
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.
P0A09 at a glance
- Check engine lightYes, usually on
- Emissions testNot an emissions code
- Limp modePossible
- Repair difficultyHard
- Typical labor1 to 5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P0A09
- Power unit, battery or hybrid warning light on
- 12 V battery not charged, voltage drops
- On EVs the drive battery may also stop charging
Common causes of P0A09
- Most 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
- Less likelyFaulty input stage in the hybrid/EV control module
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Dcdc converterHigh voltage batteryWiring harness
What each part of P0A09 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 0 | Generic code: it means the same on every make (SAE standard). |
| A | Area: hybrid propulsion. |
| 09 | The exact fault in that area. |
What to do next
- Note P0A09 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P0A09
What does P0A09 mean?
P0A09 means "DC/DC Converter Status Circuit Low". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P0A09?
Drive gently and only to a workshop. With P0A09 the car can go into limp mode (reduced power) to protect itself.
Will P0A09 fail an emissions test?
P0A09 is not an emissions code, so on its own it usually does not fail an emissions test. Other stored codes or a lit check engine light still can.
How hard is P0A09 to fix?
Difficulty: hard. A typical repair takes 1 to 5 hours of work. This is a job for a workshop.
Will P0A09 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.