AutoCodes – Generic – P0A0C

P0A0C Code - High Voltage System Interlock Circuit Low

Quick Answer

The Diagnostic Trouble Code (DTC) monitors sensed voltage when the command voltage is high to determine if the circuit is faulty. Common causes include Faulty High Voltage System Interlock, High Voltage System Interlock harness is open or shorted, High Voltage System Interlock circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P0A0C indicates High Voltage System Interlock Circuit Low.
Common causes: Common causes include Faulty High Voltage System Interlock, High Voltage System Interlock harness is open or shorted, High Voltage System Interlock circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 6,675

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on May 11, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P0A0C Description

The Diagnostic Trouble Code (DTC) monitors sensed voltage when the command voltage is high to determine if the circuit is faulty.

OBDII Code P0A0C - High Voltage System Interlock Circuit Low - AutoCodes.com — P0A0C Code - High Voltage System Interlock Circuit Low

What does this mean?

What are the Possible Causes of the DTC P0A0C?

Faulty High Voltage System Interlock
High Voltage System Interlock harness is open or shorted
High Voltage System Interlock circuit poor electrical connection

How to Fix the DTC P0A0C?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0A0C code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0A0C code?

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Information for Specific Makes

P0A0C Chevrolet — High Voltage System Interlock Circuit Low
P0A0C GMC — High Voltage System Interlock Circuit Low

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.