AutoCodes – Saturn – P1A29 Saturn

P1A29 Saturn 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 Saturn 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 931

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

What does this mean?

What are the Possible Causes of the DTC P1A29 Saturn?

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 Saturn?

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 Saturn 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 P1A29 Saturn code?

Need more information on how to fix the P1A29 Saturn code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1A29 Saturn 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 P1A29 Saturn Code

1. What are common symptoms of OBDII code P1A29 on a Saturn Hybrid related to the Hybrid Battery 2 Circuit Low Voltage?

Common symptoms include reduced hybrid system performance, poor fuel efficiency, and illumination of the check engine light.

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

Possible causes include a faulty hybrid battery pack, issues with the battery management system, wiring harness problems, or a defective sensor.

3. How can I diagnose the OBDII code P1A29 on my Saturn Hybrid?

Diagnosing this code typically involves using a scan tool to retrieve the specific fault codes, inspecting the hybrid battery system components, and performing voltage tests on the battery and related circuits.

4. Is it safe to continue driving my Saturn Hybrid with the P1A29 code indicating Low Voltage in Hybrid Battery 2 Circuit?

It is not recommended to continue driving the vehicle with this code present, as it can lead to further damage to the hybrid system and potentially cause dangerous situations.

5. How can I reset the OBDII code P1A29 on my Saturn Hybrid after making repairs?

After addressing the underlying issue causing the code, you can reset the code using an OBDII scan tool or by disconnecting the vehicle's battery for a few minutes.

6. Can I repair the Hybrid Battery 2 Circuit Low Voltage issue on my Saturn Hybrid myself?

While some simple repairs like checking for loose connections or replacing a sensor may be possible for DIY enthusiasts, diagnosing and repairing complex hybrid system issues is best left to experienced professionals.

7. What should I do if the OBDII code P1A29 persists after repairing the Hybrid Battery 2 Circuit Low Voltage issue on my Saturn Hybrid?

If the code persists after repairs, it may indicate a more serious underlying problem that requires further diagnostics by a qualified mechanic specializing in hybrid vehicles.

8. How important is it to address the OBDII code P1A29 Saturn Hybrid Battery 2 Circuit Low Voltage promptly?

It is crucial to address this code promptly to prevent potential damage to the hybrid system components and ensure the vehicle operates safely and efficiently.

9. Are there any maintenance tips to prevent the recurrence of the OBDII code P1A29 on my Saturn Hybrid?

Regularly inspecting and maintaining the hybrid battery system, ensuring proper charging habits, and addressing any warning signs promptly can help prevent the recurrence of this code.

10. How much does it typically cost to repair the Hybrid Battery 2 Circuit Low Voltage issue on a Saturn Hybrid?

The cost of repairing this issue can vary depending on the specific cause of the problem, the extent of the damage, and the labor rates of the repair shop. It is advisable to obtain quotes from multiple mechanics to compare prices.