P0A8F14 Volt Power Module System Performance
- 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
- P0A8F means the 14 V power module (DC/DC converter for the 12 V network) does not perform as expected even though its signals are electrically in range. GM's 2013 eAssist tables use it as a correlation test: with the APM commanded on and ignition voltage 9 to 32 V, the APM's own low-voltage reading and the run/crank voltage measured by the controller must agree within 4.5 V. A larger difference over 3.75 s in a 5 s window sets the code as Type B, two trips to MIL. A high resistance in the 12 V output path or ground, a drifting sensor or a converter that cannot hold its target can all cause this. P0A8D and P0A8E cover sensor circuit low/high faults.
- What you may notice
- MIL and charging/hybrid warning
- Low or fluctuating 12 V voltage
- Likely causes
- LikelyHigh resistance in 12 V output cable, fuse link or ground
- PossibleDrifting voltage sensor in the module
- PossibleConverter unable to hold its target 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: €80 – €1,800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.