AutoCodes – Buick – P1A29 Buick

P1A29 Buick Code - Hybrid Battery 2 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: P1A29 Buick indicates Hybrid Battery 2 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 907

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 P1A29 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 P1A29 Buick - Hybrid Battery 2 Circuit Low Voltage - AutoCodes.com — P1A29 Buick Code - Hybrid Battery 2 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1A29 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 P1A29 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 P1A29 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.

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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 P1A29 Buick Code

1. What are the common symptoms of OBDII code P1A29 Buick (Hybrid Battery 2 Circuit Low Voltage)?

- The common symptoms include reduced hybrid system performance, decreased fuel economy, and potential illumination of the check engine light.

2. What are the possible causes of OBDII code P1A29 Buick (Hybrid Battery 2 Circuit Low Voltage)?

- The code may be triggered by issues such as a faulty hybrid battery pack, damaged wiring or connectors, or problems with the battery management system.

3. How can I diagnose the OBDII code P1A29 Buick (Hybrid Battery 2 Circuit Low Voltage)?

- Diagnosis typically involves using a scan tool to retrieve the code, checking the condition of the hybrid battery, inspecting wiring for damage, and testing the battery management system.

4. Can driving with OBDII code P1A29 Buick (Hybrid Battery 2 Circuit Low Voltage) cause further damage?

- Driving with this code may lead to reduced hybrid system performance and worsen fuel economy. It is advisable to address the underlying issue promptly to prevent further damage.

5. What are some repair tips for addressing OBDII code P1A29 Buick (Hybrid Battery 2 Circuit Low Voltage)?

- Repair tips may include replacing the hybrid battery pack if it is found to be faulty, repairing or replacing damaged wiring or connectors, and reprogramming the battery management system.

6. Is it safe to continue driving my Buick with OBDII code P1A29 (Hybrid Battery 2 Circuit Low Voltage)?

- While the vehicle may still be operable with this code, it is recommended to address the issue promptly to avoid potential performance issues and further damage to the hybrid system.

7. Can a DIY enthusiast fix OBDII code P1A29 Buick (Hybrid Battery 2 Circuit Low Voltage)?

- Depending on the skill level and access to tools, some DIY enthusiasts may be able to address this code by following repair guides and procedures provided by the manufacturer.

8. How much does it typically cost to repair OBDII code P1A29 Buick (Hybrid Battery 2 Circuit Low Voltage)?

- Repair costs can vary based on the extent of the issue, parts needed for replacement, and labor rates. It is advisable to obtain estimates from reputable repair shops.

9. Are there any preventive measures to avoid OBDII code P1A29 Buick (Hybrid Battery 2 Circuit Low Voltage)?

- Regularly maintaining the hybrid system, monitoring battery health, and addressing any warning signs promptly can help prevent issues leading to this trouble code.

10. How long does it take to repair OBDII code P1A29 Buick (Hybrid Battery 2 Circuit Low Voltage)?

- The repair time can vary depending on the specific issue, availability of parts, and the expertise of the technician. It is recommended to consult with a professional for an accurate timeline.