AutoCodes – Cadillac – P1B1C Cadillac

P1B1C Cadillac Code - Hybrid/Electric Vehicle Battery 29 Circuit Performance

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: P1B1C Cadillac indicates Hybrid/Electric Vehicle Battery 29 Circuit Performance.
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 880

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 08, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1B1C 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 P1B1C Cadillac - Hybrid/Electric Vehicle Battery 29 Circuit Performance - AutoCodes.com — P1B1C Cadillac Code - Hybrid/Electric Vehicle Battery 29 Circuit Performance

What does this mean?

What are the Possible Causes of the DTC P1B1C Cadillac?

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

How to Fix the DTC P1B1C 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 P1B1C 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 P1B1C Cadillac Code

1. What does the OBDII code P1B1C mean on a Cadillac?

P1B1C indicates a performance issue with the Hybrid/Electric Vehicle Battery 29 Circuit, commonly related to the battery's voltage, wiring, or control module.

2. What are the symptoms of the P1B1C code in a Cadillac?

Common symptoms include a check engine light, reduced hybrid system performance, warning messages on the dash, or decreased fuel efficiency.

3. What causes the P1B1C code to appear?

Potential causes include a faulty battery cell, damaged wiring or connectors in the battery circuit, or a malfunctioning hybrid powertrain control module.

4. Can I drive my Cadillac with the P1B1C code?

Driving is possible but not recommended, as the hybrid system may operate at reduced efficiency or fail entirely, potentially causing further damage.

5. How is the P1B1C code diagnosed?

A technician will use a scan tool to monitor hybrid battery data, inspect wiring and connections, and test individual battery cells for performance issues.

6. What repairs are needed to fix the P1B1C code?

Repairs may include replacing a faulty battery cell, repairing damaged wiring, or reprogramming or replacing the hybrid powertrain control module.

7. Is the P1B1C code specific to Cadillac vehicles?

While the code is not exclusive to Cadillac, it is specific to hybrid or electric vehicles and relates to their battery systems.

8. How much does it cost to repair the P1B1C code in a Cadillac?

Repair costs vary widely, ranging from $100 for minor wiring fixes to over $1,000 if a battery module or control unit replacement is required.

9. Can a weak 12-volt battery trigger the P1B1C code?

A weak 12-volt battery is unlikely to directly trigger P1B1C but can cause related electrical issues that might lead to hybrid system errors.

10. How can I prevent the P1B1C code from recurring?

Regular maintenance, such as inspecting the battery system, ensuring proper connections, and updating software, can help prevent this code from recurring.