AutoCodes – Buick – P1A2A Buick

P1A2A Buick Code - Hybrid Battery 2 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: P1A2A Buick indicates Hybrid Battery 2 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 856

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
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

Code P1A2A Buick 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 P1A2A Buick - Hybrid Battery 2 Circuit High Voltage - AutoCodes.com — P1A2A Buick Code - Hybrid Battery 2 Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1A2A Buick?

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 P1A2A Buick?

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 P1A2A Buick 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 P1A2A Buick code?

Need more information on how to fix the P1A2A Buick code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1A2A Buick code diagnosed by a professional: Find a repair shop in your area

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 P1A2A Buick Code

1. What does the OBDII code P1A2A mean on a Buick?

P1A2A indicates a high voltage issue in the Hybrid Battery 2 Circuit, typically found in hybrid or electric Buicks.

2. What are common symptoms of the P1A2A code?

Symptoms may include the check engine light, reduced fuel efficiency, limited hybrid system performance, or the vehicle entering limp mode.

3. What causes the P1A2A code to appear?

Common causes include a faulty hybrid battery module, damaged wiring, poor electrical connections, or a malfunctioning battery control module.

4. Can I drive my Buick with the P1A2A code?

Driving with this code is not recommended as it can reduce hybrid system efficiency and potentially lead to further damage to the battery or electrical components.

5. How do I diagnose the P1A2A code?

Diagnosis involves scanning the vehicle with an OBDII tool, inspecting the hybrid battery and wiring for damage, and testing the battery control module.

6. How can the P1A2A code be fixed?

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

7. How much does it cost to fix the P1A2A code on a Buick?

Repair costs vary but can range from $500 to $4,000 depending on whether the hybrid battery needs replacement or if minor repairs are sufficient.

8. Can a weak 12V battery cause the P1A2A code?

While unlikely, a weak 12V battery can sometimes impact hybrid system functionality and should be tested as part of the diagnosis.

9. Will clearing the P1A2A code make it go away permanently?

Clearing the code without addressing the underlying issue will only temporarily remove it; the code will likely return unless the problem is fixed.

10. Is the P1A2A code covered under warranty?

If your Buickâ€™s hybrid system is still under warranty, repairs related to the hybrid battery or its components may be covered. Check with your dealership for details.