AutoCodes – Mercury – P0A0A Mercury

P0A0A Mercury Code - High Voltage System Interlock Circuit

Quick Answer

The Traction Battery Control Module (TBCM) or the Transaxle Control Module (TCM) checks the continuity of the high-voltage interlock circuit. Common causes include Faulty front or rear Inertia Fuel Shutoff (IFS) Switch, Faulty Traction Battery, Faulty DC/DC Converter. 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: P0A0A Mercury indicates High Voltage System Interlock Circuit.
Common causes: Common causes include Faulty front or rear Inertia Fuel Shutoff (IFS) Switch, Faulty Traction Battery, Faulty DC/DC Converter.
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 408

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 Oct 04, 2023

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P0A0A Mercury Description

The Traction Battery Control Module (TBCM) or the Transaxle Control Module (TCM) checks the continuity of the high-voltage interlock circuit. When the TBCM or TCM detects an open circuit condition this Diagnostic Trouble Code (DTC) is set.

OBDII Code P0A0A Mercury - High Voltage System Interlock Circuit - AutoCodes.com — P0A0A Mercury Code - High Voltage System Interlock Circuit

What does this mean?

What are the Possible Causes of the DTC P0A0A Mercury?

Faulty front or rear Inertia Fuel Shutoff (IFS) Switch
Faulty Traction Battery
Faulty DC/DC Converter
Faulty Transaxle

How to Fix the DTC P0A0A Mercury?

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 P0A0A Mercury 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.

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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.