P0A8D14 Volt Power Module System Voltage Low
- 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
- P0A8D reports too low a voltage at the 14 V power module (DC/DC converter feeding the 12 V network). GM uses it in its 2013 eAssist tables as the circuit-low check of the APM low-voltage sensor: if that sensor reads below 1 V for 1.5 s within a 2 s window while ignition voltage is 9 to 32 V, the code sets; it passes again above 1.5 V. It is Type B, two trips to MIL. Because a real 12 V network cannot be at 1 V with the ignition on, GM's version really points to an open or shorted voltage sense line or a failed sensor, not a flat battery. Other makers may apply the code to genuine undervoltage. P0A8E is the high counterpart, P0A8F the correlation check.
- What you may notice
- MIL and charging/hybrid warning
- 12 V battery discharges
- Start/stop disabled
- Likely causes
- LikelyVoltage sense line open or shorted to ground
- PossibleVoltage sensor inside the power module failed
- RareConverter not delivering output (fuse, output cable)
- 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.