P0A8E14 Volt Power Module System Voltage High
- 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
- P0A8E signals too high a voltage at the 14 V power module, the DC/DC converter supplying the 12 V side. In GM's 2013 eAssist tables it is the circuit-high check of the APM low-voltage sensor: a reading above 20 V for 1.5 s within a 2 s window, with ignition voltage 9 to 32 V, sets the code, and it passes below 19.5 V. GM rates it Type B, so the MIL comes on after two failing trips. Since the network should sit around 14 V, a reading over 20 V usually means a sense line shorted to a higher potential or a faulty sensor; a genuinely over-regulating converter would also threaten bulbs and modules. P0A8D is the low counterpart, P0A8F compares the sensor with the ignition voltage.
- What you may notice
- MIL and charging/hybrid warning
- Very bright lights or failing bulbs if overvoltage is real
- Converter may be shut down
- Likely causes
- LikelyVoltage sense line shorted to a higher potential
- PossibleVoltage sensor inside the power module failed
- RareConverter regulating its output too high
- 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.