P0B91 GMC Code - Hybrid/Electric Vehicle Battery 18 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
- P0B91 GMC indicates Hybrid/Electric Vehicle Battery 18 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.
Code P0B91 GMC Description
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.
What are the Possible Causes of the DTC P0B91 GMC?
- Faulty Hybrid/Electric Vehicle Battery Pack
- Faulty Hybrid/Electric Vehicle Battery Interface Control Module
How to Fix the DTC P0B91 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 P0B91 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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Frequently Asked Questions about P0B91 GMC Code
What does the OBDII code P0B91 mean on a GMC vehicle?
P0B91 indicates a performance issue with the Hybrid/Electric Vehicle Battery 18 Circuit, typically related to one of the battery modules or its associated wiring.
What are the common symptoms of a P0B91 code?
Symptoms may include reduced fuel efficiency, limited electric drive capability, warning lights on the dashboard, and possible reduced vehicle performance.
What causes the P0B91 code to appear?
Common causes include a faulty battery module, damaged wiring or connectors in the battery circuit, or issues with the hybrid control module.
Can I drive my GMC vehicle with a P0B91 code?
While the vehicle may still function, driving with this code can lead to reduced performance and potential damage to the hybrid system. It’s best to address the issue promptly.
How is the P0B91 code diagnosed?
A mechanic will typically use a scan tool to verify the code, inspect the battery module and wiring for damage, and test circuit performance to pinpoint the issue.
What repairs are commonly needed for a P0B91 code?
Repairs may involve replacing the affected battery module, repairing damaged wiring or connectors, or reprogramming the hybrid control module.
How much does it cost to fix a P0B91 code?
Repair costs vary depending on the issue. Replacing a battery module can be expensive, ranging from hundreds to thousands of dollars, while wiring repairs may be less costly.
Can a P0B91 code be fixed without replacing the battery module?
In some cases, the issue may lie in the wiring or connectors, which can be repaired without replacing the battery module.
Is the P0B91 code common in GMC hybrid vehicles?
This code is not overly common but can occur in GMC hybrid or electric vehicles as they age or experience wear in the battery system.
Do I need specialized tools to fix the P0B91 code?
Yes, diagnosing and repairing this code often requires advanced scan tools and proper safety equipment due to the high voltage in hybrid systems.
Discuss the causes and fixes for P0B91 GMC OBDII Code
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