AutoCodes – Chevrolet – P1A31 Chevrolet

P1A31 Chevrolet 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 Chevrolet 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 894

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

What does this mean?

What are the Possible Causes of the DTC P1A31 Chevrolet?

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 Chevrolet?

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 Chevrolet 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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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 P1A31 Chevrolet Code

1. What does the OBDII code P1A31 mean for a Chevrolet?

P1A31 indicates a "Hybrid Battery 3 Circuit High Voltage" issue, meaning the vehicleâ€™s hybrid system has detected an abnormally high voltage in one of the hybrid battery circuits.

2. What are the common symptoms of code P1A31 in a Chevrolet?

Symptoms may include an illuminated check engine light, reduced hybrid performance, warning messages on the dashboard, decreased fuel efficiency, or the vehicle entering limp mode.

3. What causes the P1A31 code to appear?

Common causes include a faulty hybrid battery module, damaged wiring or connectors in the battery circuit, or a malfunctioning battery control module.

4. Can driving with a P1A31 code damage my Chevrolet?

Yes, continuing to drive with this code may lead to further damage to the hybrid system and reduced performance. Itâ€™s best to address the issue promptly.

5. How can I diagnose a P1A31 code in my Chevrolet?

Use an advanced scan tool to check for additional hybrid-related codes, inspect the hybrid battery wiring and connectors for damage or corrosion, and test the affected battery module for abnormal voltage.

6. What repairs are typically needed for a P1A31 code?

Repairs may include replacing or repairing damaged wiring, replacing the faulty hybrid battery module, or reprogramming the battery control module.

7. Is the P1A31 code covered under warranty for Chevrolet hybrids?

It depends on the age and mileage of your vehicle, but hybrid battery-related issues may be covered under the extended hybrid system warranty. Check with your dealership for details.

8. Can a weak 12-volt battery cause a P1A31 code?

While unlikely, a weak 12-volt battery can sometimes interfere with hybrid system operation. Itâ€™s worth testing the 12-volt battery as part of the diagnosis.

9. How much does it cost to fix a P1A31 code on a Chevrolet?

Repair costs vary widely depending on whether the issue is with wiring, a battery module, or the control module. Repairs can range from $100 for minor wiring fixes to over $1,000 for hybrid battery module replacement.

10. Can I clear a P1A31 code without fixing the issue?

Clearing the code without addressing the underlying problem will likely result in the code returning. Proper diagnosis and repair are necessary to resolve the issue permanently.