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Engine-Codes – GMC – U1807 GMC

U1807 GMC Code - Battery Charger Control Module High Voltage Energy Management CAN Bus Off

Quick Answer

The U1807 GMC code indicates a problem with the Battery Charger Control Module (BCCM) in the vehicle. Common causes include Wiring issues or loose connections, Faulty Battery Charger Control Module (BCCM), Malfunctioning CAN bus. 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
U1807 GMC indicates Battery Charger Control Module High Voltage Energy Management CAN Bus Off.
Common causes
Common causes include Wiring issues or loose connections, Faulty Battery Charger Control Module (BCCM), Malfunctioning CAN bus.
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 15, 2024
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Code U1807 GMC Description

The U1807 GMC code indicates a problem with the Battery Charger Control Module (BCCM) in the vehicle. Specifically, it points to high voltage energy management CAN bus off, which means that there is a communication issue between the BCCM and other modules in the vehicle through the Controller Area Network (CAN) bus. The BCCM is responsible for managing the charging of the vehicle's battery, ensuring that it receives the correct voltage and current for optimal performance. When this module is not functioning properly, it can lead to various issues with the vehicle's electrical system and overall performance.

OBDII Code U1807 GMC - Battery Charger Control Module High Voltage Energy Management CAN Bus Off
U1807 GMC Code - Battery Charger Control Module High Voltage Energy Management CAN Bus Off

Common Causes of U1807 GMC

  1. Wiring issues or loose connections
  2. Faulty Battery Charger Control Module (BCCM)
  3. Malfunctioning CAN bus
  4. Battery issues such as low voltage or age
  5. Software glitches in the vehicle's electrical system

Symptoms of U1807 GMC

  1. Difficulty starting the vehicle
  2. Dim or flickering lights
  3. Malfunctioning power windows or locks
  4. Erratic behavior of climate control system
  5. Warning lights on the dashboard related to the battery or electrical system

How to Fix U1807 GMC

  1. Begin by conducting a thorough inspection of the wiring and connections related to the BCCM and the CAN bus.
  2. Test the Battery Charger Control Module to determine if it is functioning properly or needs to be replaced.
  3. Check the battery's voltage and condition to ensure it is not contributing to the issue.
  4. If necessary, update the software in the vehicle's electrical system to address any glitches or communication errors.
  5. Clear the diagnostic trouble codes and perform a test drive to verify that the issue has been resolved.

Cost to Fix U1807 GMC

The typical repair costs for addressing a U1807 GMC code can range from $200 to $600, depending on the specific cause of the issue and the cost of parts and labor. It's important to note that diagnosis time and labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate. Additionally, factors such as the vehicle make and model, location, and engine type can also impact the overall cost of the repair.

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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 U1807 GMC Code

1. What are the common symptoms of OBDII code U1807 in a GMC vehicle?

The common symptoms of OBDII code U1807 in a GMC vehicle may include issues with the battery charger control module, high voltage energy management system, and CAN bus communication.

2. What are some possible causes of OBDII code U1807 in a GMC vehicle?

Possible causes of OBDII code U1807 in a GMC vehicle include a malfunctioning battery charger control module, issues with the high voltage energy management system, or problems with the CAN bus communication network.

3. How can I diagnose OBDII code U1807 in a GMC vehicle?

Diagnosing OBDII code U1807 in a GMC vehicle typically involves using a diagnostic scanner to retrieve the specific fault code, inspecting the battery charger control module and related components, and testing the CAN bus communication network for any faults.

4. What are some repair tips for fixing OBDII code U1807 in a GMC vehicle?

Repairing OBDII code U1807 in a GMC vehicle may involve repairing or replacing the battery charger control module, addressing any issues with the high voltage energy management system, and ensuring proper communication on the CAN bus network.

5. Can I drive my GMC vehicle with OBDII code U1807?

It is not recommended to drive your GMC vehicle with OBDII code U1807, as it may indicate potential issues with the battery charger control module, high voltage energy management system, or CAN bus communication, which can affect the overall performance and safety of the vehicle.

6. How much does it typically cost to repair OBDII code U1807 in a GMC vehicle?

The cost of repairing OBDII code U1807 in a GMC vehicle can vary depending on the specific underlying issue, parts needed for repair, and labor costs. It's best to consult with a professional mechanic for an accurate estimate.

7. Is OBDII code U1807 a serious issue in a GMC vehicle?

OBDII code U1807 in a GMC vehicle can be a serious issue, as it may indicate problems with critical systems like the battery charger control module, high voltage energy management, and CAN bus communication. It's important to address this code promptly to prevent further damage.

8. Can I reset OBDII code U1807 in a GMC vehicle on my own?

Resetting OBDII code U1807 in a GMC vehicle may temporarily clear the code, but it is essential to diagnose and repair the underlying issue causing the fault code to prevent it from reoccurring. Consult with a professional mechanic for proper diagnosis and repair.

9. Will OBDII code U1807 cause my GMC vehicle to fail an emissions test?

OBDII code U1807 may cause your GMC vehicle to fail an emissions test, as it indicates issues with the battery charger control module, high voltage energy management system, or CAN bus communication. It's recommended to address this code before undergoing an emissions test.

10. How long does it take to repair OBDII code U1807 in a GMC vehicle?

The time it takes to repair OBDII code U1807 in a GMC vehicle can vary depending on the specific issue and the availability of parts. Some repairs may be completed in a few hours, while others may take longer. Consult with a professional mechanic for a more accurate timeframe.

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