P0B42 GMC Code - Hybrid/Electric Vehicle Battery 2 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
- P0B42 GMC indicates Hybrid/Electric Vehicle Battery 2 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.
Code P0B42 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 P0B42 GMC?
- Faulty Hybrid/Electric Vehicle Battery Pack
- Faulty Hybrid/Electric Vehicle Battery Interface Control Module
How to Fix the DTC P0B42 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 P0B42 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 P0B42 GMC Code
1. What does the OBDII code P0B42 mean for a GMC vehicle?
P0B42 indicates a "Hybrid/Electric Vehicle Battery 2 Circuit Low Voltage," meaning the voltage in Battery 2 or its circuit is below the expected range.
2. What are the common symptoms of the P0B42 code in GMC vehicles?
Symptoms include reduced hybrid system performance, illumination of the check engine light, decreased fuel efficiency, and potential vehicle drivability issues.
3. What causes the P0B42 code on a GMC hybrid/electric vehicle?
Common causes include faulty battery modules, damaged wiring or connectors in the Battery 2 circuit, a defective battery control module, or internal battery pack issues.
4. How is the P0B42 code diagnosed in a GMC vehicle?
A technician will use a scan tool to read the code, inspect the wiring and connectors, check for voltage discrepancies in the battery circuit, and test the battery modules.
5. Can I continue driving my GMC vehicle with the P0B42 code?
It's not recommended to drive with this code, as it could lead to further damage to the hybrid system or cause the vehicle to enter limp mode.
6. How do you fix the P0B42 code on a GMC hybrid/electric vehicle?
Repairs may include replacing faulty battery modules, repairing damaged wiring or connectors, or reprogramming or replacing the battery control module.
7. How much does it cost to repair the P0B42 code on a GMC vehicle?
Repair costs can vary widely, ranging from $100 for minor wiring repairs to over $1,000 for battery module replacements or control module repairs.
8. Can a weak 12V battery trigger the P0B42 code on a GMC hybrid?
No, the P0B42 code specifically relates to the high-voltage hybrid battery system, not the standard 12V auxiliary battery.
9. Can clearing the P0B42 code solve the problem?
Clearing the code without addressing the underlying issue will not solve the problem, and the code is likely to return.
10. Is the P0B42 code covered under the GMC hybrid battery warranty?
It depends on your vehicle's warranty coverage. Many hybrid systems have extended warranties for battery components, so check with your dealership.
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