P0A8E code meaning
14 Volt Power Module System Voltage High
Powertrain system Generic code P0Axx codes Check engine light
What P0A8E means
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.
P0A8E at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modeNot expected
- Repair difficultyWorkshop only
- Typical labor1 to 4 hours
- Clears after repairAfter a drive cycle
Symptoms of P0A8E
- MIL and charging/hybrid warning
- Very bright lights or failing bulbs if overvoltage is real
- Converter may be shut down
Common causes of P0A8E
- Most likelyVoltage sense line shorted to a higher potential
- PossibleVoltage sensor inside the power module failed
- Less likelyConverter regulating its output too high
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Pm14v moduleDcdc converter
What each part of P0A8E 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. |
| 8E | The exact fault in that area. |
What to do next
- Note P0A8E 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 P0A8E
What does P0A8E mean?
P0A8E means "14 Volt Power Module System Voltage High". P0A8E signals too high a voltage at the 14 V power module, the DC/DC converter supplying the 12 V side. It is a generic code, so it means the same on every make.
Is it safe to drive with P0A8E?
Usually yes, for a short time, if the check engine light is steady and the car drives normally. If the light flashes or the car runs badly, stop and have it checked.
Will P0A8E fail an emissions test?
Yes, it can. P0A8E is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P0A8E to fix?
Difficulty: workshop only. A typical repair takes 1 to 4 hours of work. This is a job for a workshop.
Will P0A8E clear itself after the repair?
After the repair the car has to complete a drive cycle (a mix of city and highway driving) before the test runs again. Until then the readiness monitor shows "not ready", which can fail an inspection.