AutoCodes – Cadillac – U1807 Cadillac

U1807 Cadillac 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 Cadillac 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.

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Code Popularity 404

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 07, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1807 Cadillac Description

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. If this serial data system is inoperative the devices will not communicate with each other on this bus, but they still communicate with the scan tool through high-speed GMLAN bus.
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.

OBDII Code U1807 Cadillac - Battery Charger Control Module High Voltage Energy Management CAN Bus Off - AutoCodes.com — U1807 Cadillac Code - Battery Charger Control Module High Voltage Energy Management CAN Bus Off

What does this mean?

What are the Possible Causes of the DTC U1807 Cadillac?

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 Cadillac?

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 Cadillac 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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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 Cadillac Code

1. What are the common symptoms of OBDII code U1807 in a Cadillac related to the Battery Charger Control Module High Voltage Energy Management CAN Bus Off?

- Common symptoms may include issues with the vehicle's charging system, such as slow or incomplete charging of the battery, erratic voltage readings, or warning lights related to the battery system.

2. What are the possible causes of OBDII code U1807 indicating Battery Charger Control Module High Voltage Energy Management CAN Bus Off in a Cadillac?

- The code U1807 can be triggered by issues such as a faulty battery charger control module, wiring issues in the CAN bus network, a malfunctioning battery management system, or a communication breakdown between control modules.

3. How can I diagnose the OBDII code U1807 in a Cadillac related to Battery Charger Control Module High Voltage Energy Management CAN Bus Off?

- Diagnosis may involve using an OBDII scanner to read the code, checking the battery charger control module for proper function, inspecting the wiring and connections in the CAN bus network, and performing voltage tests to identify any abnormalities.

4. Are there any simple repair tips for addressing OBDII code U1807 in a Cadillac indicating Battery Charger Control Module High Voltage Energy Management CAN Bus Off?

- Basic repair steps may include checking and tightening all electrical connections, resetting the battery management system, clearing the code with a scanner, and monitoring the system for any reoccurrence of the code.

5. Can OBDII code U1807 in a Cadillac related to Battery Charger Control Module High Voltage Energy Management CAN Bus Off be safely driven with?

- It is not recommended to drive the vehicle with unresolved battery charger control module issues, as it may lead to further electrical system problems and potential breakdowns. It is advisable to address the underlying cause promptly.

6. How serious is OBDII code U1807 indicating Battery Charger Control Module High Voltage Energy Management CAN Bus Off in a Cadillac?

- While the code itself may not cause immediate drivability issues, it points to potential problems with the vehicle's electrical system that can impact overall performance and reliability. Ignoring the code may lead to more severe complications.

7. Can a DIY enthusiast fix OBDII code U1807 related to Battery Charger Control Module High Voltage Energy Management CAN Bus Off in a Cadillac?

- Depending on the individual's skill level and access to tools, some basic troubleshooting and repairs related to the code may be possible. However, complex electrical issues may require professional diagnosis and repair.

8. How much does it typically cost to repair OBDII code U1807 in a Cadillac indicating Battery Charger Control Module High Voltage Energy Management CAN Bus Off?

- Repair costs can vary significantly depending on the specific cause of the code, parts needed for replacement, labor rates, and whether the repair is performed at a dealership or an independent repair shop. Estimates from several sources are recommended.

9. Is there a way to prevent OBDII code U1807 from appearing in a Cadillac due to Battery Charger Control Module High Voltage Energy Management CAN Bus Off?

- Regular maintenance, timely battery system checks, avoiding overloading the electrical system, and promptly addressing any warning lights or unusual symptoms related to the charging system can help prevent the occurrence of this code.

10. How long does it usually take to repair OBDII code U1807 related to Battery Charger Control Module High Voltage Energy Management CAN Bus Off in a Cadillac?

- The repair time can vary depending on the complexity of the issue causing the code, availability of parts, and the expertise of the technician. Some repairs may be completed within a few hours, while more intricate problems may require more time.