AutoCodes – Chevrolet – P0AA1 Chevrolet

P0AA1 Chevrolet Code - Hybrid/EV Battery Positive Contactor Circuit Stuck Closed

Quick Answer

The hybrid/EV battery contains 5 high voltage contactors and 2 transistors. Common causes include Faulty Battery Energy Control Module, Battery Energy Control Module harness is open or shorted, Battery Energy Control Module 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: P0AA1 Chevrolet indicates Hybrid/EV Battery Positive Contactor Circuit Stuck Closed.
Common causes: Common causes include Faulty Battery Energy Control Module, Battery Energy Control Module harness is open or shorted, Battery Energy Control Module 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 3,677

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 Apr 25, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0AA1 Chevrolet Description

The hybrid/EV battery contains 5 high voltage contactors and 2 transistors. The high voltage contactors and transistors allow the high voltage DC batteries to be connected to the vehicle or safely contain the high voltage DC within the hybrid/EV battery assembly. The 5 high voltage contactors consist of a main positive high voltage contactor, main negative high voltage contactor, charge positive high voltage contactor, charge negative high voltage contactor and multi-function high voltage contactor. The 2 transistors consist of the precharge transistor and heater transistor. The contactors and transistors close and open in a specific sequence controlled by the hybrid/EV powertrain control module 2. The hybrid/EV powertrain control module 2 supplies voltage to the control circuit for the high voltage contactors/transistors. Ground is provided through the case ground.

OBDII Code P0AA1 Chevrolet - Hybrid/EV Battery Positive Contactor Circuit Stuck Closed - AutoCodes.com — P0AA1 Chevrolet Code - Hybrid/EV Battery Positive Contactor Circuit Stuck Closed

What does this mean?

What are the Possible Causes of the DTC P0AA1 Chevrolet?

Faulty Battery Energy Control Module
Battery Energy Control Module harness is open or shorted
Battery Energy Control Module circuit poor electrical connection

How to Fix the DTC P0AA1 Chevrolet?

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 P0AA1 Chevrolet 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.

Frequently Asked Questions about P0AA1 Chevrolet Code

1. What does the OBD-II code P0AA1 mean on a Chevrolet?

P0AA1 indicates that the hybrid/EV battery positive contactor circuit is stuck closed, meaning the contactor is not opening when commanded to do so.

2. What are the common symptoms of the P0AA1 code in a Chevrolet vehicle?

Symptoms may include a check engine light, reduced or no power from the hybrid/EV system, and the vehicle potentially failing to start.

3. What causes the P0AA1 code to trigger?

Common causes include a faulty battery positive contactor, wiring or connector issues, a malfunctioning battery control module, or an internal hybrid battery fault.

4. Can I drive my Chevrolet with a P0AA1 code?

It is not recommended to drive with this code, as it may indicate a serious issue with the hybrid battery system that could lead to further damage or unsafe operation.

5. How is the P0AA1 code diagnosed?

A technician will inspect the battery positive contactor, check wiring and connectors for damage or corrosion, and use a scan tool to monitor the contactor's operation and associated module data.

6. What repairs can fix the P0AA1 code on a Chevrolet?

Repairs may include replacing a faulty battery positive contactor, repairing or replacing damaged wiring, or reprogramming or replacing the battery control module.

7. How much does it cost to fix a P0AA1 code on a Chevrolet?

Repair costs vary depending on the specific issue but can range from $200 for minor wiring repairs to over $1,000 if the contactor or control module needs replacement.

8. Can a dead 12-volt battery cause the P0AA1 code?

A weak or dead 12-volt battery can cause communication issues that might trigger this code, so itâ€™s essential to check the 12-volt system as part of the diagnosis.

9. Is the P0AA1 code covered under warranty for Chevrolet hybrid/EV vehicles?

The repair may be covered under the hybrid/EV battery or powertrain warranty, depending on the vehicleâ€™s age and mileage. Check with your dealership for details.

10. How can I prevent the P0AA1 code from occurring again?

Ensure regular inspections of the hybrid battery system, keep wiring and connectors free of corrosion, and follow the manufacturerâ€™s recommended maintenance schedule.