AutoCodes – GMC – P1A2B GMC

P1A2B GMC Code - Hybrid Battery 2 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: P1A2B GMC indicates Hybrid Battery 2 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.

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Code Popularity 818

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Feb 15, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1A2B 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 P1A2B GMC - Hybrid Battery 2 Voltage - AutoCodes.com — P1A2B GMC Code - Hybrid Battery 2 Voltage

What does this mean?

What are the Possible Causes of the DTC P1A2B 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 P1A2B 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 P1A2B 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 P1A2B GMC code?

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Need Help with the Code?

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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 P1A2B GMC Code

1. What does the OBDII code P1A2B mean on a GMC vehicle?

P1A2B indicates an issue with the voltage in Hybrid Battery 2, which may signify a problem with the hybrid battery system or its components.

2. What are the common symptoms of the P1A2B code?

Symptoms include reduced fuel efficiency, limited hybrid system performance, a check engine light, and possible warning messages related to the hybrid system.

3. What causes the P1A2B code in GMC vehicles?

Common causes include a faulty hybrid battery module, damaged battery cells, poor electrical connections, or issues with the battery voltage sensor.

4. Can the P1A2B code cause drivability issues?

Yes, it can lead to limited hybrid functionality, reduced power, or the vehicle operating solely on the internal combustion engine.

5. How is the P1A2B code diagnosed?

A technician will use a scan tool to read the code, check for related codes, inspect the hybrid battery voltage, and test electrical connections within the battery system.

6. Is it safe to drive with the P1A2B code active?

Driving may be possible, but it is not recommended as it can lead to further damage to the hybrid system and reduced fuel efficiency.

7. How do you fix the P1A2B code on a GMC vehicle?

Repairs may involve replacing the hybrid battery module, repairing damaged connections, or recalibrating the battery control module.

8. What tools are needed to diagnose the P1A2B code?

A professional-grade OBDII scanner that can read hybrid system codes and a multimeter to test voltage levels are typically required.

9. Can a weak 12V battery trigger the P1A2B code?

While unlikely, a weak 12V battery can sometimes cause hybrid system errors, so it should be tested as part of the diagnostic process.

10. How much does it cost to repair the P1A2B code on a GMC vehicle?

The cost varies depending on whether the hybrid battery needs repair or replacement, ranging from a few hundred dollars for minor fixes to several thousand dollars for a new battery module.