P0A0E: High Voltage System Interlock Circuit A Intermittent

The interlock loop A signal drops out or jumps for short moments and then recovers, so the module sees an unstable loop rather than a lasting open or short. Typical are connectors with loose or spread contacts, harness sections that move with the body or drivetrain, and moisture in seals. No manufacturer documents P0A0E publicly; the GM tables only list P0A0C and P0A0D for the same loop. Reference designs and patents on interlock monitoring describe the loop as a current or voltage path through each HV connector and point out that contact resistance and interference can cause brief false trips. CARB treats the HVIL as a safety-only system. For the driver this means sudden HV shutdowns or no-starts that come and go; static faults use P0A0A to P0A0D.

High severity. Can I keep driving?If the car still runs, drive as little as possible and go to a specialized repair shop. Do not touch the orange cables: they carry high voltage.

Symptoms

Hybrid/EV warning that appears and disappears
Occasional loss of ready mode or sudden shutdown of electric drive
Intermittent no-start, often after rough roads or rain

Most likely causes

Loose or spread interlock contacts in an HV or low-voltage connector
Harness section with a broken strand that opens under vibration
Moisture entering through a damaged connector seal
Electrical interference on the interlock line or a weak module input

What to check, in order

Start with the simplest. You can tick off each step.

Read the codes with a hybrid-compatible scanner and write down the freeze frame data
Check the sensor's ground and make sure the signal wire is not receiving voltage from another circuit.
Make sure the battery cooling air intake is clean
Check the 12 V auxiliary battery, which can also trigger warnings
Leave any high-voltage measurements to a specialized repair shop

Good to know

Repair difficulty: hard
It can trigger limp mode.

What each character of P0A0E means

P: Powertrain: engine and transmission
0: Generic code: same on every make
A: Hybrid or air and fuel
0E: Specific fault in that system

Frequently asked questions

Can I keep driving with code P0A0E?

If the car still runs, drive as little as possible and go to a specialized repair shop. Do not touch the orange cables: they carry high voltage.

What causes code P0A0E?

The most common causes are: loose or spread interlock contacts in an HV or low-voltage connector; harness section with a broken strand that opens under vibration; moisture entering through a damaged connector seal.

Related codes

Sources

Values and procedures vary by manufacturer. If it affects brakes, steering, fuel or high voltage, see a professional. Updated: 2026-11-04. How we build these pages.