AutoCodes – Cadillac – P1B29 Cadillac

P1B29 Cadillac Code - Hybrid/Electric Vehicle Battery 28 Circuit

Quick Answer

The Hybrid/Electric Vehicle battery pack contains 288 cells. Common causes include Faulty Hybrid/Electric Vehicle Battery Pack, Faulty Hybrid/Electric Vehicle Battery Interface Control Module. 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: P1B29 Cadillac indicates Hybrid/Electric Vehicle Battery 28 Circuit.
Common causes: Common causes include Faulty Hybrid/Electric Vehicle Battery Pack, Faulty Hybrid/Electric Vehicle Battery Interface Control Module.
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 997

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 Mar 12, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1B29 Cadillac Description

The Hybrid/Electric Vehicle battery pack contains 288 cells. Groups of three cells are welded together in parallel. There are a total of 96 cell groups in the hybrid/EV battery pack assembly. These cell groups are electrically connected in-series. Each individual cell group is rated at 3.7 V, for a nominal system voltage of 355 V direct current. The battery cells are also grouped together into three sections. The first 90 cells/30 cell groups make up battery section one. This section is adjacent to the cowl and contains batteries 67 through to 96. Battery section two is located behind section one. It is made up of 72 cells/24 cell groups and contains batteries 43 through to 66. The transverse battery section is section number three, it is made up of the remaining 126 cells/42 cell groups and contains batteries 1 through to 42. The three battery sections are individually serviceable components.
The battery energy control module monitors the voltage of the 96 battery cell groups through the four hybrid/EV battery interface control modules. Voltage sense circuits are attached to each individual cell group, and these sense circuits terminate at a connector located on the top surface of the battery section. A serviceable auxiliary battery wiring harness joins this connector to a hybrid/EV battery interface control module, also located on the top surface of the battery section. The hybrid/EV battery interface control module encodes the voltage reading and transmits it to the battery energy control module through the battery control harness. There is one hybrid/EV battery interface control module located on battery sections one and two, and two hybrid/EV battery interface control modules associated with battery section three. The hybrid/EV battery interface control module, battery energy control module wiring harness, auxiliary battery wiring harness, and battery energy control module are all considered serviceable components.
The battery energy control module will determine when a fault condition is present. Diagnostics and system status are communicated from the battery energy control module to hybrid/EV powertrain control module 2 through serial data. The hybrid/EV powertrain control module 2 is the host controller for diagnostic trouble code information.

OBDII Code P1B29 Cadillac - Hybrid/Electric Vehicle Battery 28 Circuit - AutoCodes.com — P1B29 Cadillac Code - Hybrid/Electric Vehicle Battery 28 Circuit

What does this mean?

What are the Possible Causes of the DTC P1B29 Cadillac?

Faulty Hybrid/Electric Vehicle Battery Pack
Faulty Hybrid/Electric Vehicle Battery Interface Control Module

How to Fix the DTC P1B29 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 P1B29 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.

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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 P1B29 Cadillac Code

1. What are common symptoms of OBDII code P1B29 in a Cadillac hybrid/electric vehicle?

- Common symptoms include reduced hybrid/electric vehicle performance, decreased fuel efficiency, and potential issues with the high-voltage battery.

2. What can cause the OBDII code P1B29 to trigger in a Cadillac hybrid/electric vehicle?

- This code may be triggered by issues such as a faulty battery pack, damaged wiring in the battery circuit, or problems with the battery management system.

3. How can I diagnose the OBDII code P1B29 in my Cadillac hybrid/electric vehicle?

- Diagnosing this code typically requires specialized diagnostic equipment to check the battery pack, conduct voltage tests, and inspect the battery circuit for any damage or loose connections.

4. Can I continue driving my Cadillac with the OBDII code P1B29 present?

- It is not recommended to continue driving the vehicle with this code present, as it may lead to further damage to the hybrid/electric system and potentially compromise safety.

5. What are some repair tips for addressing the OBDII code P1B29 in a Cadillac hybrid/electric vehicle?

- Repair tips may include checking and repairing any damaged wiring in the battery circuit, testing the battery pack for faults, and resetting the code after addressing the underlying issue.

6. How much does it typically cost to repair the OBDII code P1B29 in a Cadillac hybrid/electric vehicle?

- Repair costs can vary depending on the extent of the issue, but they may range from a few hundred to a few thousand dollars, especially if the battery pack needs to be replaced.

7. Is it possible to reset the OBDII code P1B29 in a Cadillac without fixing the underlying issue?

- While you can clear the code temporarily, it is not recommended as the issue will likely resurface, potentially causing more damage and safety risks.

8. Can a Cadillac dealership help diagnose and repair the OBDII code P1B29 in a hybrid/electric vehicle?

- Yes, Cadillac dealerships have the expertise and specialized equipment to properly diagnose and repair issues related to hybrid/electric vehicle systems, including this specific code.

9. Are there any preventative maintenance steps I can take to avoid the OBDII code P1B29 in my Cadillac hybrid/electric vehicle?

- Regularly checking the high-voltage battery system, monitoring battery performance, and addressing any warning signs promptly can help prevent issues leading to this code.

10. How long does it typically take to repair the OBDII code P1B29 in a Cadillac hybrid/electric vehicle?

- Repair times can vary depending on the complexity of the issue, but it may take anywhere from a few hours to a few days to diagnose and repair the problem effectively.