AutoCodes – Cadillac – P1B2A Cadillac

P1B2A Cadillac Code - Hybrid/Electric Vehicle Battery 29 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: P1B2A Cadillac indicates Hybrid/Electric Vehicle Battery 29 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 742

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 P1B2A 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 P1B2A Cadillac - Hybrid/Electric Vehicle Battery 29 Circuit - AutoCodes.com — P1B2A Cadillac Code - Hybrid/Electric Vehicle Battery 29 Circuit

What does this mean?

What are the Possible Causes of the DTC P1B2A Cadillac?

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

How to Fix the DTC P1B2A 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 P1B2A 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 P1B2A Cadillac Code

1. What does the OBDII code P1B2A mean on a Cadillac?

P1B2A indicates an issue with the Hybrid/Electric Vehicle Battery 29 Circuit, typically related to voltage irregularities or communication errors within the battery system.

2. What are the common symptoms of code P1B2A in a Cadillac?

Common symptoms include a check engine light, reduced hybrid/electric vehicle performance, decreased fuel efficiency, or the vehicle entering limp mode.

3. What causes the P1B2A code to trigger?

The code can be caused by faulty battery sensors, damaged wiring or connectors in the battery circuit, a malfunctioning battery module, or software issues in the vehicle's hybrid control module.

4. How can I diagnose the P1B2A code on my Cadillac?

Start by scanning the vehicle with an OBDII scanner to confirm the code, then inspect the hybrid battery wiring, connectors, and sensors for damage or loose connections. Advanced diagnostics may require specialized tools.

5. Can I still drive my Cadillac with the P1B2A code?

While the vehicle may still be drivable, continued use could lead to further damage or reduced performance. It's best to address the issue as soon as possible.

6. How do I fix the P1B2A code on a Cadillac?

Repairs may involve replacing faulty sensors, repairing damaged wiring, reprogramming the control module, or, in rare cases, replacing the affected battery module.

7. Is the P1B2A code specific to Cadillacs?

No, the P1B2A code can appear on other hybrid or electric vehicles, but the exact diagnostics and repairs may vary by manufacturer.

8. Can a low 12-volt battery cause the P1B2A code?

While unlikely, a weak 12-volt battery could affect hybrid system diagnostics and should be tested to rule it out as a contributing factor.

9. Do I need a professional mechanic to fix the P1B2A code?

Yes, due to the high-voltage systems in hybrid and electric vehicles, itâ€™s safer and more effective to have a qualified technician handle the repairs.

10. How much does it cost to repair the P1B2A code on a Cadillac?

Repair costs vary depending on the exact issue but can range from $200 for minor wiring repairs to over $1,000 if a battery module replacement is needed.