What are the common causes of P0A8E?

An overcharged battery. A failed voltage regulator. A short in the electrical system. Corrosion at the module connections.

Read 14 volt power module voltage on a scan tool. Check battery charge level. Test the voltage regulator. Inspect the electrical system for a short. Replace the alternator if voltage stays high. Clear the code and retest.

P0A8E

14 Volt Power Module System Voltage High

System: Powertrain control (P code)
Lamp: Check Engine Light
Category: Powertrain - Hybrid Propulsion

What it means

P0A8E means 14 Volt Power Module System Voltage High.

Where it lives

For P0A8E, the part to look at first is the module named here.

Check these first

An overcharged battery
A failed voltage regulator
A short in the electrical system
Corrosion at the module connections

What to do next

Read 14 volt power module voltage on a scan tool
Check battery charge level
Test the voltage regulator
Inspect the electrical system for a short
Replace the alternator if voltage stays high
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.