U1807 Code - Battery Charger Control Module High Voltage Energy Management CAN Bus Off
Quick Answer
The high voltage energy management high-speed General Motor Local Area Network (GMLAN) serial data circuits are serial data buses used to communicate information between the Hybrid Powertrain Control Module 2, the Battery Energy Control Module, and the Battery Charger. Common causes include Faulty Battery Charger Control Module, Battery Charger Control Module harness is open or shorted, Battery Charger Control Module circuit poor electrical connection. 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 indicates Battery Charger Control Module High Voltage Energy Management CAN Bus Off.
- Common causes
- Common causes include Faulty Battery Charger Control Module, Battery Charger Control Module harness is open or shorted, Battery Charger Control Module circuit poor electrical connection.
- 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 U1807 Description
The scan tool does not communicate with devices through the high voltage energy management high-speed GMLAN bus. The high voltage energy high-speed GMLAN serial data circuits connect directly to the auxiliary data connector and do not connect with the scan tool.
The Diagnostic Trouble Code (DTC) will set when the device setting the DTC has attempted to establish communications on the serial data circuits for more than 1.4 seconds without success.
What are the Possible Causes of the DTC U1807?
- Faulty Battery Charger Control Module
- Battery Charger Control Module harness is open or shorted
- Battery Charger Control Module circuit poor electrical connection
How to Fix the DTC U1807?
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 U1807 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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Information for Specific Makes
- U1807 Buick — Battery Charger Control Module High Voltage Energy Management CAN Bus Off
- U1807 Cadillac — Battery Charger Control Module High Voltage Energy Management CAN Bus Off
- U1807 Chevrolet — Battery Charger Control Module High Voltage Energy Management CAN Bus Off
- U1807 GMC — Battery Charger Control Module High Voltage Energy Management CAN Bus Off
Frequently Asked Questions about U1807 Code
1. What are common symptoms of OBDII code U1807?
Common symptoms include issues with the battery charging system, poor battery performance, and potential difficulties starting the vehicle.
2. What causes the OBDII code U1807 to be triggered?
This code is typically triggered by a malfunction in the Battery Charger Control Module, high voltage energy management system, or a disruption in the CAN bus communication network.
3. How can I diagnose the cause of OBDII code U1807?
Diagnosing this code usually involves using a professional OBDII scanner to retrieve the specific fault codes, checking the battery charger control module, inspecting the high voltage energy management system, and testing the CAN bus communication network.
4. Can a faulty battery charger control module be repaired, or does it need to be replaced?
In some cases, a faulty battery charger control module can be repaired by fixing wiring issues or addressing software glitches. However, if the module is severely damaged, replacement may be necessary.
5. Are there any safety precautions to consider when dealing with OBDII code U1807?
When working with high voltage energy management systems and battery charger control modules, it is essential to take proper safety precautions, such as disconnecting the battery and following manufacturer guidelines.
6. Will OBDII code U1807 prevent my vehicle from starting?
While the code itself may not prevent the vehicle from starting, underlying issues with the battery charger control module or energy management system could potentially lead to starting problems.
7. How urgent is it to address OBDII code U1807?
It is recommended to address this code promptly to prevent further damage to the battery system and ensure proper functioning of the vehicle's electrical components.
8. Can resetting the OBDII code U1807 resolve the issue temporarily?
Resetting the code may temporarily clear the warning light, but it will not fix the underlying problem. It is important to diagnose and repair the root cause of the issue.
9. Are there any DIY repair tips for addressing OBDII code U1807?
DIY repair tips may include checking for loose connections, inspecting wiring for damage, and ensuring proper grounding of the battery charger control module.
10. Is it necessary to visit a professional mechanic for OBDII code U1807 or can I fix it myself?
Depending on your level of automotive knowledge and experience with electrical systems, you may be able to address this code yourself. However, consulting a professional mechanic is recommended for accurate diagnosis and repair.
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