AutoCodes – Generic – P1A2E

P1A2E Code - Hybrid Battery 2 Voltage Very Low

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: P1A2E indicates Hybrid Battery 2 Voltage Very Low.
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 1,105

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 P1A2E 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 P1A2E - Hybrid Battery 2 Voltage Very Low - AutoCodes.com — P1A2E Code - Hybrid Battery 2 Voltage Very Low

What does this mean?

What are the Possible Causes of the DTC P1A2E?

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 P1A2E?

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 P1A2E 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 P1A2E code?

Need more information on how to fix the P1A2E code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1A2E code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1A2E Buick — Hybrid Battery 2 Voltage Very Low
P1A2E Cadillac — Hybrid Battery 2 Voltage Very Low
P1A2E Chevrolet — Hybrid Battery 2 Voltage Very Low
P1A2E GMC — Hybrid Battery 2 Voltage Very Low
P1A2E Saturn — Hybrid Battery 2 Voltage Very Low

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 P1A2E Code

1. What are the common symptoms of OBDII code P1A2E (Hybrid Battery 2 Voltage Very Low)?

The common symptoms include a decrease in hybrid system performance, difficulty starting the vehicle, and the illumination of the hybrid system warning light on the dashboard.

2. What can cause the OBDII code P1A2E to trigger?

This code is typically triggered when the voltage of the second hybrid battery falls below the specified threshold, indicating a problem with the hybrid battery's voltage level.

3. How serious is the OBDII code P1A2E (Hybrid Battery 2 Voltage Very Low)?

This code should be taken seriously as it can lead to reduced hybrid system efficiency and potentially cause further damage to the hybrid battery and related components if not addressed promptly.

4. What are some possible repair tips for addressing OBDII code P1A2E?

Some repair tips include checking the hybrid battery's voltage levels, inspecting for any loose connections or damaged wiring, and if necessary, replacing the hybrid battery or related components.

5. Can driving with the OBDII code P1A2E present cause further damage to the vehicle?

Continuing to drive with this code present can potentially cause further damage to the hybrid system components and may lead to more costly repairs down the line. It is recommended to address the issue as soon as possible.

6. How can I diagnose OBDII code P1A2E at home?

You can diagnose this code at home using an OBDII scanner to read the code and determine the voltage level of the second hybrid battery. However, for a more accurate diagnosis and repair, it is recommended to consult a professional mechanic.

7. Is it safe to continue driving my vehicle with the hybrid battery 2 voltage very low?

It is not recommended to continue driving your vehicle with this issue as it can lead to further complications and potential damage to the hybrid system components. It is best to address the problem promptly.

8. Can extreme weather conditions affect the voltage of the hybrid battery and trigger code P1A2E?

Yes, extreme weather conditions such as very high or very low temperatures can impact the voltage levels of the hybrid battery and potentially trigger the P1A2E trouble code.

9. How long does it typically take to repair OBDII code P1A2E related to the hybrid battery 2 voltage being very low?

The repair time can vary depending on the exact cause of the issue. It can range from a few hours to a day, especially if the hybrid battery needs to be replaced.

10. Will resetting the trouble code P1A2E make it go away permanently?

Simply resetting the trouble code may temporarily clear the warning light, but if the underlying issue causing the low voltage in hybrid battery 2 is not addressed, the code is likely to reappear. It is important to diagnose and repair the root cause of the problem.