AutoCodes – GMC – P1B81 GMC

P1B81 GMC Code - Hybrid/Electric Vehicle Battery 53 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: P1B81 GMC indicates Hybrid/Electric Vehicle Battery 53 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 694

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 P1B81 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 P1B81 GMC - Hybrid/Electric Vehicle Battery 53 Circuit Performance - AutoCodes.com — P1B81 GMC Code - Hybrid/Electric Vehicle Battery 53 Circuit Performance

What does this mean?

What are the Possible Causes of the DTC P1B81 GMC?

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

How to Fix the DTC P1B81 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 P1B81 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 P1B81 GMC Code

1. What are the common symptoms of OBDII code P1B81 in a GMC Hybrid/Electric Vehicle?

- Common symptoms include reduced hybrid/electric vehicle performance, decreased fuel efficiency, and the illumination of the check engine light.

2. What could cause the OBDII code P1B81 in a GMC Hybrid/Electric Vehicle?

- The code P1B81 typically indicates a fault in the Hybrid/Electric Vehicle Battery 53 Circuit, which can be caused by issues such as a faulty battery module, wiring problems, or a malfunctioning battery management system.

3. How can I diagnose the OBDII code P1B81 in my GMC Hybrid/Electric Vehicle?

- Diagnosing the code P1B81 usually involves using a diagnostic scanner to retrieve the specific fault codes, conducting a visual inspection of the battery and related components, and performing voltage and resistance tests on the battery circuit.

4. What are some repair tips for resolving the OBDII code P1B81 in a GMC Hybrid/Electric Vehicle?

- Repair tips may include replacing the faulty battery module, repairing damaged wiring, resetting the battery management system, and ensuring proper connection of all components.

5. Can I continue driving my GMC Hybrid/Electric Vehicle with the OBDII code P1B81 present?

- It is not recommended to continue driving the vehicle with the code P1B81 present, as it can lead to further damage to the hybrid/electric system and potentially compromise vehicle safety.

6. How much does it typically cost to repair the OBDII code P1B81 in a GMC Hybrid/Electric Vehicle?

- The cost of repairing the OBDII code P1B81 can vary depending on the specific issue causing the fault, but it may range from a few hundred to over a thousand dollars, including parts and labor.

7. Are there any recalls or technical service bulletins related to the OBDII code P1B81 in GMC Hybrid/Electric Vehicles?

- It's advisable to check with a GMC dealership or online resources to see if there are any recalls or technical service bulletins related to the OBDII code P1B81 in your specific vehicle model.

8. How often should I have the hybrid/electric battery system inspected to prevent issues like the OBDII code P1B81?

- It's recommended to have the hybrid/electric battery system inspected regularly as part of routine maintenance, typically following the manufacturer's guidelines or at least once a year.

9. Can I reset the OBDII code P1B81 in my GMC Hybrid/Electric Vehicle using a diagnostic tool?

- Yes, the OBDII code P1B81 can be reset using a diagnostic tool, but it is essential to address the underlying issue causing the fault code to prevent it from reoccurring.

10. Is it possible to prevent the OBDII code P1B81 from appearing in my GMC Hybrid/Electric Vehicle?

- While some issues leading to the code P1B81 may be unavoidable, regular maintenance, timely repairs of any identified faults, and following the manufacturer's recommended guidelines can help prevent this code from appearing.