AutoCodes – GMC – P0AA1 GMC

P0AA1 GMC 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 GMC 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 1,335

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

What does this mean?

What are the Possible Causes of the DTC P0AA1 GMC?

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 GMC?

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 GMC 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 GMC Code

1. What are the common symptoms of OBDII code P0AA1 in a GMC hybrid/EV vehicle?

- Common symptoms include the hybrid/EV system not engaging, decreased fuel efficiency, and issues with acceleration.

2. What can cause the Hybrid/EV Battery Positive Contactor Circuit to be stuck closed in a GMC vehicle?

- The most common causes of this issue are a faulty positive contactor relay, damaged wiring, or a malfunction in the hybrid/EV battery system.

3. How serious is the P0AA1 code related to the Hybrid/EV Battery Positive Contactor Circuit in a GMC vehicle?

- This code should be addressed promptly as it can affect the performance and reliability of the hybrid/EV system, potentially leading to further damage if left unresolved.

4. Can I continue driving my GMC vehicle with the Hybrid/EV Battery Positive Contactor Circuit stuck closed?

- It is not recommended to drive the vehicle with this issue as it can result in reduced performance and potential safety concerns related to the hybrid/EV system.

5. How can I diagnose the source of the Hybrid/EV Battery Positive Contactor Circuit issue in my GMC vehicle?

- A thorough inspection by a qualified mechanic with diagnostic tools specific to hybrid/EV systems is recommended to pinpoint the exact cause of the problem.

6. What are some repair tips for fixing the Hybrid/EV Battery Positive Contactor Circuit stuck closed in a GMC vehicle?

- Repair tips may include checking and replacing the positive contactor relay, inspecting and repairing any damaged wiring, and resetting the hybrid/EV system.

7. Is it possible to reset the OBDII code P0AA1 related to the Hybrid/EV Battery Positive Contactor Circuit in a GMC vehicle?

- Resetting the code is possible after addressing the underlying issue, but it is essential to ensure the problem is fixed to prevent the code from reoccurring.

8. How much does it typically cost to repair the Hybrid/EV Battery Positive Contactor Circuit issue in a GMC vehicle?

- The cost of repair can vary depending on the extent of the damage and the specific components that need to be replaced, but it is advisable to budget for potentially significant repairs.

9. Are there any preventative maintenance steps to avoid the Hybrid/EV Battery Positive Contactor Circuit issue in a GMC vehicle?

- Regular inspections of the hybrid/EV system, including checking the contactors and wiring, can help prevent issues like the circuit getting stuck closed.

10. Can a DIY enthusiast with automotive knowledge fix the Hybrid/EV Battery Positive Contactor Circuit problem in a GMC vehicle?

- Due to the complexity of hybrid/EV systems and the specialized tools required, it is recommended to seek assistance from a qualified mechanic or technician for proper diagnosis and repair.