AutoCodes – GMC – P1B55 GMC

P1B55 GMC Code - Hybrid/Electric Vehicle Battery 38 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: P1B55 GMC indicates Hybrid/Electric Vehicle Battery 38 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 938

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 09, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1B55 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 P1B55 GMC - Hybrid/Electric Vehicle Battery 38 Circuit Low Voltage - AutoCodes.com — P1B55 GMC Code - Hybrid/Electric Vehicle Battery 38 Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P1B55 GMC?

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

How to Fix the DTC P1B55 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 P1B55 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 P1B55 GMC Code

1. What are common symptoms of OBDII code P1B55 GMC indicating Hybrid/Electric Vehicle Battery 38 Circuit Low Voltage?

The common symptoms include reduced hybrid system performance, decreased fuel efficiency, and potential issues with starting the vehicle.

2. What are the possible causes of OBDII code P1B55 GMC related to Hybrid/Electric Vehicle Battery 38 Circuit Low Voltage?

Possible causes include a faulty hybrid/electric vehicle battery, damaged battery wiring or connections, or issues with the battery control module.

3. How can I diagnose the source of OBDII code P1B55 GMC for Hybrid/Electric Vehicle Battery 38 Circuit Low Voltage?

Diagnosis involves checking the battery voltage levels, inspecting the battery connections and wiring, and using a diagnostic tool to analyze the battery control module.

4. Can I drive my vehicle with OBDII code P1B55 GMC for Hybrid/Electric Vehicle Battery 38 Circuit Low Voltage?

It is not recommended to drive the vehicle with this code present, as it can lead to further damage to the hybrid/electric system and potentially leave you stranded.

5. How can I repair OBDII code P1B55 GMC for Hybrid/Electric Vehicle Battery 38 Circuit Low Voltage?

Repair options may include replacing the hybrid/electric vehicle battery, repairing damaged wiring or connections, or reprogramming the battery control module.

6. Are there any safety concerns associated with OBDII code P1B55 GMC for Hybrid/Electric Vehicle Battery 38 Circuit Low Voltage?

Yes, there can be safety concerns due to potential issues with the hybrid/electric system, such as unexpected power loss or electrical malfunctions.

7. Can a DIY enthusiast fix OBDII code P1B55 GMC for Hybrid/Electric Vehicle Battery 38 Circuit Low Voltage?

Repairing this code may require specialized knowledge and tools related to hybrid/electric systems, so it is recommended to consult a professional mechanic or dealership.

8. How much does it cost to repair OBDII code P1B55 GMC for Hybrid/Electric Vehicle Battery 38 Circuit Low Voltage?

The cost of repair can vary depending on the extent of the issue, the parts needed, and labor costs, so it's best to get a diagnostic assessment from a qualified technician.

9. Will resetting the OBDII code P1B55 GMC for Hybrid/Electric Vehicle Battery 38 Circuit Low Voltage make it go away permanently?

Resetting the code may temporarily clear it, but if the underlying issue is not addressed, the code is likely to reappear once the system detects the problem again.

10. Is it possible to prevent OBDII code P1B55 GMC for Hybrid/Electric Vehicle Battery 38 Circuit Low Voltage from occurring?

Regular maintenance of the hybrid/electric system, including monitoring battery health and keeping connections secure, can help prevent this code from appearing.