P0A8B14 Volt Power Module System Voltage
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Needs a drive cycle to confirm a fix
- How the car detects it
- The 14 V power module (DC/DC converter) regulates the voltage of the 12 V network in hybrid and electric vehicles. P0A8B is the general code for a fault in the voltage this module produces or senses, without the more specific labels unstable, low, high or performance (P0A8C to P0A8F). No manufacturer documents this code publicly. GM's 2013 eAssist tables show how the sibling codes are used for the same function: the APM low-voltage sensor is checked against fixed limits and against the separately measured run/crank voltage. A fault here means the 12 V system may no longer be supplied reliably, so the 12 V battery and consumers should be checked before the module is condemned.
- What you may notice
- Charging or hybrid system warning
- Electrical consumers behave erratically
- 12 V battery discharged
- Likely causes
- PossibleInternal fault of the DC/DC converter
- PossibleLoose or corroded 12 V output cable or ground connection
- RareWeak 12 V battery distorting the system voltage
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · 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.