AutoCodes – Cadillac – P1B2B Cadillac

P1B2B Cadillac Code - Hybrid/Electric Vehicle Battery 30 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: P1B2B Cadillac indicates Hybrid/Electric Vehicle Battery 30 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 790

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 P1B2B 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 P1B2B Cadillac - Hybrid/Electric Vehicle Battery 30 Circuit - AutoCodes.com — P1B2B Cadillac Code - Hybrid/Electric Vehicle Battery 30 Circuit

What does this mean?

What are the Possible Causes of the DTC P1B2B Cadillac?

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

How to Fix the DTC P1B2B 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 P1B2B 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 P1B2B Cadillac Code

1. What does the OBDII code P1B2B mean on a Cadillac?

The P1B2B code indicates an issue with the Hybrid/Electric Vehicle Battery 30 Circuit, often related to voltage irregularities or communication errors within the battery system.

2. What are the common symptoms of a P1B2B code on a Cadillac?

Symptoms may include an illuminated check engine light, reduced vehicle performance, diminished fuel efficiency, or warnings related to the hybrid/electric system.

3. What causes the P1B2B code to appear on a Cadillac?

Potential causes include a faulty battery module, damaged wiring or connectors, a malfunctioning battery control module, or software issues in the hybrid system.

4. Can I drive my Cadillac with the P1B2B code active?

Driving is not recommended as the issue may affect the hybrid system's performance or cause further damage to the vehicle's electrical components.

5. How do you diagnose the P1B2B code on a Cadillac?

Diagnosis involves using an OBDII scanner to confirm the code, inspecting the battery system's wiring and connectors, and testing the battery modules and control circuits.

6. How is the P1B2B code fixed on a Cadillac?

Repairs may include replacing a faulty battery module, repairing damaged wiring or connectors, recalibrating the battery control module, or performing a software update.

7. How much does it cost to fix a P1B2B code on a Cadillac?

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

8. Can a dead 12V battery cause the P1B2B code to appear on a Cadillac?

While unlikely, a weak or dead 12V battery can sometimes trigger hybrid system errors, so itâ€™s worth checking as part of the diagnostic process.

9. Does the P1B2B code mean I need to replace the entire hybrid battery?

Not necessarily. The issue might be isolated to a single module or circuit within the battery pack, which can sometimes be repaired or replaced individually.

10. Can I clear the P1B2B code without fixing the problem?

While you can clear the code with an OBDII scanner, the issue will likely return if the underlying problem is not addressed.