AutoCodes – GMC – P1A2A GMC

P1A2A GMC Code - Hybrid Battery 2 Circuit High Voltage

Quick Answer

Battery voltage sensors allow the Energy Storage Control Module (ESCM) to monitor the voltage of the batteries in the Energy Storage Box (ESB). Common causes include Faulty Energy Storage Box (ESB) Battery, Faulty Battery Energy Control Module (BECM), Battery Energy Control Module (BECM) harness is open or shorted. 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: P1A2A GMC indicates Hybrid Battery 2 Circuit High Voltage.
Common causes: Common causes include Faulty Energy Storage Box (ESB) Battery, Faulty Battery Energy Control Module (BECM), Battery Energy Control Module (BECM) harness is open or shorted.
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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 1,159

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 15, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P1A2A GMC Description

Battery voltage sensors allow the Energy Storage Control Module (ESCM) to monitor the voltage of the batteries in the Energy Storage Box (ESB). The batteries apply voltage to internal input resistors that are connected to the signal circuits of the battery voltage sensors. The module provides ground to the battery voltage sensors through the reference circuit. The ESCM monitors the voltage drop across the battery voltage sensors and uses the inputs for hybrid calculations. When the battery voltage is high, the resistances of the sensors are high and the voltage signals are high. When the battery voltage is low, the resistances of the sensors are low and the voltage signals are low.

OBDII Code P1A2A GMC - Hybrid Battery 2 Circuit High Voltage - AutoCodes.com — P1A2A GMC Code - Hybrid Battery 2 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1A2A GMC?

Faulty Energy Storage Box (ESB) Battery
Faulty Battery Energy Control Module (BECM)
Battery Energy Control Module (BECM) harness is open or shorted
Battery Energy Control Module (BECM) circuit poor electrical connection

How to Fix the DTC P1A2A 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 P1A2A 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.

Need more information about the P1A2A GMC code?

Need more information on how to fix the P1A2A GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1A2A GMC code diagnosed by a professional: Find a repair shop in your area

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 P1A2A GMC Code

1. What does the OBDII code P1A2A mean on a GMC vehicle?

The P1A2A code indicates an issue with the Hybrid Battery 2 Circuit High Voltage, meaning the vehicle's hybrid system has detected an abnormal voltage level in one of the battery circuits.

2. What are the symptoms of a P1A2A code in a GMC vehicle?

Common symptoms include the check engine light or hybrid system warning light turning on, reduced fuel efficiency, limited hybrid system performance, and possible difficulty starting the vehicle.

3. What causes the P1A2A code to appear?

Possible causes include a faulty hybrid battery module, damaged wiring in the battery circuit, poor electrical connections, or a malfunctioning battery control module.

4. Can I drive my GMC with a P1A2A code?

It is not recommended to drive with this code, as it can lead to further damage in the hybrid system and compromise vehicle performance.

5. How do I fix the P1A2A code on my GMC vehicle?

Repairs may include inspecting and repairing damaged wiring, cleaning or tightening electrical connections, replacing the faulty hybrid battery module, or reprogramming or replacing the battery control module.

6. How do technicians diagnose a P1A2A code?

Technicians use a scan tool to verify the code, perform a visual inspection of the hybrid battery circuit, test for proper voltage levels, and check for loose or damaged connections.

7. What is the cost of repairing a P1A2A code in a GMC vehicle?

Repair costs vary, but replacing a hybrid battery module can range from $1,000 to $6,000 depending on the vehicle model and battery size. Wiring or connection repairs may cost significantly less.

8. Can a weak 12V battery cause the P1A2A code?

A weak 12V battery is unlikely to directly cause this code, but it can affect the hybrid system's performance and should be tested as part of the diagnosis.

9. Will resetting the P1A2A code fix the problem?

Clearing the code without addressing the underlying issue will not fix the problem, and the code is likely to return as the system detects the fault again.

10. Is the P1A2A code covered under warranty?

If your GMC vehicle is still under the hybrid system or powertrain warranty, repairs for this code may be covered. Check with your dealership for warranty specifics.