AutoCodes – GMC – P1B1A GMC

P1B1A GMC Code - Hybrid/Electric Vehicle Battery 28 Circuit Low Voltage

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: P1B1A GMC indicates Hybrid/Electric Vehicle Battery 28 Circuit Low Voltage.
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 892

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 P1B1A GMC 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 P1B1A GMC - Hybrid/Electric Vehicle Battery 28 Circuit Low Voltage - AutoCodes.com — P1B1A GMC Code - Hybrid/Electric Vehicle Battery 28 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1B1A GMC?

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

How to Fix the DTC P1B1A GMC?

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 P1B1A GMC 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 P1B1A GMC Code

1. What are the common symptoms of OBDII code P1B1A in a GMC hybrid/electric vehicle?

- Common symptoms include reduced hybrid system performance, decreased fuel efficiency, and warning lights on the dashboard.

2. What can cause the OBDII code P1B1A in a GMC hybrid/electric vehicle?

- The code P1B1A is typically triggered by low voltage in the hybrid/electric vehicle's battery 28 circuit, which may be due to a faulty battery pack, loose connections, or wiring issues.

3. How can I diagnose the OBDII code P1B1A in my GMC hybrid/electric vehicle?

- Diagnosing the code may require using a suitable OBDII scanner to retrieve the specific fault code and conducting a thorough inspection of the battery 28 circuit components.

4. Is it safe to continue driving with the OBDII code P1B1A present in my GMC hybrid/electric vehicle?

- It is not recommended to drive the vehicle with the code P1B1A present, as it can lead to further damage to the hybrid system and potentially cause safety hazards.

5. What are some repair tips for fixing the OBDII code P1B1A in a GMC hybrid/electric vehicle?

- Repair tips may include checking and tightening all battery connections, inspecting the wiring harness for any damage, and replacing the battery pack if necessary.

6. Can I reset the OBDII code P1B1A in my GMC hybrid/electric vehicle myself?

- While you can clear the code using an OBDII scanner, it is important to address the underlying issue causing the code to prevent it from reoccurring.

7. How much does it typically cost to repair the OBDII code P1B1A in a GMC hybrid/electric vehicle?

- Repair costs can vary depending on the extent of the issue, but it may involve replacing components in the battery 28 circuit, which can range from a few hundred to a few thousand dollars.

8. Are there any preventive measures to avoid the OBDII code P1B1A in a GMC hybrid/electric vehicle?

- Regular maintenance of the hybrid system, including checking the battery's health and keeping connections secure, can help prevent issues that may trigger the P1B1A code.

9. Can a DIY enthusiast with basic automotive knowledge attempt to fix the OBDII code P1B1A in a GMC hybrid/electric vehicle?

- While some simple checks and repairs can be done by DIY enthusiasts, diagnosing and repairing complex electrical issues like the P1B1A code may require professional expertise.

10. How long does it typically take to repair the OBDII code P1B1A in a GMC hybrid/electric vehicle?

- The repair time can vary depending on the extent of the issue and the availability of parts, but it may take a few hours to a few days to fully resolve the P1B1A code in a GMC hybrid/electric vehicle.