AutoCodes – Generic – P0A27

P0A27 Code - Hybrid Battery Pack Relay Feedback Circuit

Quick Answer

The Energy Storage Control Module (ESCM) will monitor the battery cut off switch for overvoltage or an open. Common causes include Faulty Hybrid Battery Cut Off Switch, Hybrid Battery Cut Off Switch harness is open or shorted, Hybrid Battery Cut Off Switch 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: P0A27 indicates Hybrid Battery Pack Relay Feedback Circuit.
Common causes: Common causes include Faulty Hybrid Battery Cut Off Switch, Hybrid Battery Cut Off Switch harness is open or shorted, Hybrid Battery Cut Off Switch 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 11,399

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 Feb 19, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P0A27 Description

The Energy Storage Control Module (ESCM) will monitor the battery cut off switch for overvoltage or an open. The ESCM sets the OBDII code when the Hybrid Battery Cut Off Switch is not to factory specifications.

OBDII Code P0A27 - Hybrid Battery Pack Relay Feedback Circuit - AutoCodes.com — P0A27 Code - Hybrid Battery Pack Relay Feedback Circuit

What does this mean?

What are the Possible Causes of the DTC P0A27?

Faulty Hybrid Battery Cut Off Switch
Hybrid Battery Cut Off Switch harness is open or shorted
Hybrid Battery Cut Off Switch circuit poor electrical connection

How to Fix the DTC P0A27?

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 P0A27 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 P0A27 code?

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Information for Specific Makes

P0A27 Buick — Hybrid Battery Pack Relay Feedback Circuit
P0A27 Cadillac — Hybrid Battery Pack Relay Feedback Circuit
P0A27 Chevrolet — Hybrid Battery Pack Relay Feedback Circuit
P0A27 Dodge — Hybrid Battery Power Off Circuit
P0A27 GMC — Hybrid Battery Pack Relay Feedback Circuit

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.