AutoCodes – Cadillac – P1A29 Cadillac

P1A29 Cadillac 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 Cadillac 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 1,051

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

What does this mean?

What are the Possible Causes of the DTC P1A29 Cadillac?

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 Cadillac?

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 Cadillac 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 Cadillac code?

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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 P1A29 Cadillac Code

1. What does the OBDII code P1A29 mean on a Cadillac?

Code P1A29 indicates a "Hybrid Battery 2 Circuit Low Voltage," meaning the vehicle's hybrid battery system has detected a voltage issue in one of its circuits.

2. What are the common symptoms of code P1A29 in a Cadillac?

Symptoms may include the check engine light or hybrid system warning light, reduced fuel efficiency, limited hybrid system performance, or the vehicle switching to gasoline-only mode.

3. What causes the P1A29 code on a Cadillac?

The code can be caused by low voltage in the hybrid battery, damaged wiring or connectors in the battery circuit, or a failing hybrid battery module.

4. Can driving with the P1A29 code damage my Cadillac?

Continuing to drive with this code can lead to further damage to the hybrid system or reduced performance, so itâ€™s recommended to address it promptly.

5. How is the P1A29 code diagnosed in a Cadillac?

A technician will use a scan tool to confirm the code, inspect the hybrid battery and its wiring for damage or corrosion, and test the voltage of the affected circuit.

6. Can a dead 12V battery cause the P1A29 code?

No, the P1A29 code specifically relates to the hybrid battery and its circuits, not the standard 12V battery used for starting and accessories.

7. How much does it cost to fix a P1A29 code on a Cadillac?

The cost depends on the underlying issue, ranging from a few hundred dollars for wiring repairs to several thousand if the hybrid battery needs replacement.

8. Can the P1A29 code be cleared without repairs?

The code may temporarily be cleared with a scan tool, but it will likely return if the underlying issue isnâ€™t resolved.

9. Is the P1A29 code covered under warranty for a Cadillac?

Hybrid system components, including the battery, may be covered under a longer warranty than standard parts. Check your vehicle warranty for specifics.

10. What should I do if my Cadillac shows the P1A29 code?

Have the vehicle inspected by a qualified technician as soon as possible to avoid further damage and ensure proper hybrid system performance.