AutoCodes – GMC – P1A22 GMC

P1A22 GMC Code - Hybrid Battery 1 Circuit Low 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: P1A22 GMC indicates Hybrid Battery 1 Circuit Low 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 1,063

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
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Code P1A22 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 P1A22 GMC - Hybrid Battery 1 Circuit Low Voltage - AutoCodes.com — P1A22 GMC Code - Hybrid Battery 1 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1A22 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 P1A22 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 P1A22 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 P1A22 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 P1A22 GMC Code

1. What are the common symptoms of OBDII code P1A22 GMC (Hybrid Battery 1 Circuit Low Voltage)?

The common symptoms of this code may include poor fuel economy, difficulty starting the vehicle, reduced power and acceleration, and the illumination of the check engine light.

2. What are the possible causes of OBDII code P1A22 GMC?

The main causes of this code can be a faulty hybrid battery, issues with the battery management system, corroded or loose battery connections, or a problem with the hybrid battery cooling system.

3. How can I diagnose the OBDII code P1A22 GMC?

Diagnosing this code typically requires using a scan tool to retrieve the specific fault codes, checking the hybrid battery voltage levels, inspecting the battery connections for any signs of damage, and testing the battery management system components.

4. Can I drive my vehicle with OBDII code P1A22 GMC?

It is not recommended to drive your vehicle with this code active, as it can lead to further damage to the hybrid battery and other components. It is best to have the issue diagnosed and repaired as soon as possible.

5. How can I repair OBDII code P1A22 GMC?

Repairing this code may involve replacing the hybrid battery, repairing or replacing damaged battery connections, resetting the fault codes, and ensuring proper functioning of the battery management system.

6. Are there any DIY tips for addressing OBDII code P1A22 GMC?

While some basic troubleshooting steps can be taken, it is recommended to seek professional help for dealing with this code due to the complexity of hybrid vehicle systems and the potential safety hazards involved.

7. How much does it cost to repair OBDII code P1A22 GMC?

The cost of repairing this code can vary depending on the extent of the issue, the specific components that need to be replaced, and the labor rates of the repair shop. It is advisable to get a few quotes from different mechanics.

8. Can a low voltage hybrid battery cause other issues in the vehicle?

Yes, a low voltage hybrid battery can cause a variety of issues such as poor performance, reduced fuel efficiency, difficulty starting the vehicle, and potential damage to other electrical components.

9. How often does OBDII code P1A22 GMC occur in hybrid vehicles?

This code is relatively uncommon but can occur in hybrid vehicles, especially as they age and the hybrid battery system experiences wear and tear. Regular maintenance and proper care can help prevent this code from appearing.

10. Is it safe to attempt to reset the OBDII code P1A22 GMC on my own?

While it is possible to reset the code using a scan tool, it is important to address the underlying issue causing the code to prevent further damage to the vehicle. If you are not familiar with hybrid vehicle systems, it is best to consult a professional mechanic.