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P1B79 GMC Code - Hybrid/Electric Vehicle Battery 50 Circuit Low Voltage

Quick Answer

The P1B79 code for a GMC hybrid/electric vehicle indicates a low voltage condition in the battery 50 circuit. Common causes include Faulty battery sensor, Wiring issues in the battery 50 circuit, Battery degradation or malfunction. 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
P1B79 GMC indicates Hybrid/Electric Vehicle Battery 50 Circuit Low Voltage.
Common causes
Common causes include Faulty battery sensor, Wiring issues in the battery 50 circuit, Battery degradation or malfunction.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 11, 2024
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Code P1B79 GMC Description

The P1B79 code for a GMC hybrid/electric vehicle indicates a low voltage condition in the battery 50 circuit. In a hybrid or electric vehicle, the battery system is crucial for powering the electric motor and providing energy for propulsion. When the voltage in the battery 50 circuit is low, it can lead to various issues with the vehicle's performance and efficiency.

OBDII Code P1B79 GMC - Hybrid/Electric Vehicle Battery 50 Circuit Low Voltage
P1B79 GMC Code - Hybrid/Electric Vehicle Battery 50 Circuit Low Voltage

Common Causes of P1B79 GMC

  1. Faulty battery sensor
  2. Wiring issues in the battery 50 circuit
  3. Battery degradation or malfunction
  4. Issues with the battery management system
  5. Faulty charging system components

Symptoms of P1B79 GMC

  1. Reduced acceleration or power output
  2. Decreased fuel efficiency
  3. Warning lights on the dashboard related to the hybrid/electric system
  4. Inability to switch to electric mode

How to Fix P1B79 GMC

  1. Diagnose the specific cause of the low voltage condition using a diagnostic scanner and checking the battery system components.
  2. Inspect the battery 50 circuit wiring for any damage or loose connections.
  3. Test the battery sensor and replace it if necessary.
  4. Check the battery's health and replace it if it is degraded or malfunctioning.
  5. Reset the battery management system and clear the error code from the vehicle's computer.

Cost to Fix P1B79 GMC

The cost of repairing a low voltage condition in the battery 50 circuit of a GMC hybrid/electric vehicle can vary depending on the specific cause of the issue. On average, the repair costs could range from $200 to $800, including parts and labor. However, it is important to note that labor rates at auto repair shops can vary, and additional diagnostic time may be required to pinpoint the exact cause of the problem. It is recommended to consult with a qualified mechanic or dealership for a more accurate estimate based on the specific vehicle make and model.

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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 P1B79 GMC Code

1. What does the OBDII code P1B79 mean for GMC vehicles?

P1B79 indicates a low voltage issue in the Hybrid/Electric Vehicle Battery 50 Circuit, which is part of the battery monitoring or control system.

2. What are the common symptoms of the P1B79 code?

Symptoms include reduced fuel efficiency, a hybrid system warning light, limited electric mode functionality, or a lack of power from the hybrid battery.

3. What causes the P1B79 code to appear?

Common causes include a faulty battery cell, damaged wiring or connectors in the circuit, a defective battery sensor module, or issues with the hybrid control module.

4. Can I continue driving with the P1B79 code?

Driving with this code is possible but not recommended, as it may lead to further damage to the hybrid system and reduced performance.

5. How is the P1B79 code diagnosed?

A technician will use a scan tool to read the code, inspect the hybrid battery and its circuits, check wiring and connectors, and perform voltage tests on the affected circuit.

6. What repairs can fix the P1B79 code?

Repairs may include replacing damaged wiring, repairing or replacing the hybrid battery, fixing or replacing the battery sensor module, or updating the hybrid control module software.

7. Is the P1B79 code covered under warranty?

Warranty coverage depends on the vehicle's age and mileage; hybrid battery components often have extended warranties, so it’s best to check with your dealership.

8. Can a weak 12-volt battery cause the P1B79 code?

While a weak 12-volt battery can cause some hybrid system issues, the P1B79 code specifically relates to the high-voltage hybrid battery circuit.

9. How much does it cost to fix the P1B79 code?

Repair costs vary widely, ranging from $200 for minor wiring repairs to over $3,000 if the hybrid battery needs replacement.

10. Can I reset the P1B79 code without repairs?

While clearing the code with a scan tool may temporarily remove it, the underlying issue must be fixed to prevent the code from returning and ensure proper vehicle function.

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