AutoCodes – GMC – P1A31 GMC

P1A31 GMC Code - Hybrid Battery 3 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: P1A31 GMC indicates Hybrid Battery 3 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.

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Code Popularity 852

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 P1A31 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 P1A31 GMC - Hybrid Battery 3 Circuit High Voltage - AutoCodes.com — P1A31 GMC Code - Hybrid Battery 3 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1A31 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 P1A31 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 P1A31 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 P1A31 GMC Code

1. What are the common symptoms of OBDII code P1A31 GMC (Hybrid Battery 3 Circuit High Voltage)?

- Common symptoms include the hybrid system warning light illuminating on the dashboard, reduced fuel efficiency, and potential difficulty starting the vehicle.

2. What are some possible causes of OBDII code P1A31 GMC?

- Possible causes include a malfunctioning hybrid battery pack, issues with the hybrid battery control module, or wiring/connectivity problems in the hybrid battery system.

3. How can I diagnose the source of OBDII code P1A31 GMC?

- Diagnosing this code typically requires specialized diagnostic equipment to scan the hybrid system for specific fault codes and to monitor the voltage levels in the hybrid battery pack.

4. Can I continue driving my vehicle with OBDII code P1A31 GMC active?

- It is not recommended to continue driving the vehicle with this code active, as it can lead to further damage to the hybrid system and potential safety hazards.

5. What are some repair tips for addressing OBDII code P1A31 GMC?

- Repair tips may include inspecting the hybrid battery connections for corrosion or damage, testing the hybrid battery cells for proper voltage levels, and replacing any faulty components identified during diagnosis.

6. Is it possible to reset OBDII code P1A31 GMC without fixing the underlying issue?

- While clearing the fault code may temporarily turn off the warning light, the code is likely to reappear until the underlying issue causing the high voltage in Hybrid Battery 3 Circuit is addressed.

7. How much does it typically cost to repair OBDII code P1A31 GMC?

- The cost of repair can vary depending on the specific cause of the code, but it may involve expenses for parts replacement, labor, and diagnostic services related to the hybrid battery system.

8. Can a DIY enthusiast fix OBDII code P1A31 GMC at home?

- Repairing this code may be complex and require specialized knowledge and tools related to hybrid vehicle systems, so it is recommended to seek professional assistance from a qualified technician.

9. Are there any recalls or technical service bulletins related to OBDII code P1A31 GMC?

- It's advisable to check with the vehicle manufacturer or authorized dealerships for any recalls or technical service bulletins related to Hybrid Battery 3 Circuit High Voltage issues in your specific GMC model.

10. How can I prevent OBDII code P1A31 GMC from recurring in the future?

- Regular maintenance of the hybrid battery system, including ensuring proper cooling and ventilation, monitoring voltage levels, and addressing any warning signs promptly, can help prevent the recurrence of this code.