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Engine-Codes – Generic – U1847

U1847 Code - Drive Motor Control Module 1 Lost Communication With Battery Energy Control Module On Powertrain Expansion CAN Bus

Quick Answer

The diagnostic trouble code U1847 indicates that there is a communication error between the Drive Motor Control Module 1 and the Battery Energy Control Module on the Powertrain Expansion Controller Area Network (CAN) Bus. Common causes include Loose or damaged wiring connections, Faulty CAN bus components, Software glitches or programming errors. 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
U1847 indicates Drive Motor Control Module 1 Lost Communication With Battery Energy Control Module On Powertrain Expansion CAN Bus.
Common causes
Common causes include Loose or damaged wiring connections, Faulty CAN bus components, Software glitches or programming errors.
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 09, 2024
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Code U1847 Description

The diagnostic trouble code U1847 indicates that there is a communication error between the Drive Motor Control Module 1 and the Battery Energy Control Module on the Powertrain Expansion Controller Area Network (CAN) Bus. The Drive Motor Control Module 1 is responsible for controlling the electric drive motor in hybrid or electric vehicles, while the Battery Energy Control Module manages the energy flow to and from the battery pack. When these modules are unable to communicate effectively, it can lead to performance issues and potentially affect the overall functionality of the vehicle.

OBDII Code U1847 - Drive Motor Control Module 1 Lost Communication With Battery Energy Control Module On Powertrain Expansion CAN Bus
U1847 Code - Drive Motor Control Module 1 Lost Communication With Battery Energy Control Module On Powertrain Expansion CAN Bus

Common Causes of U1847

  1. Loose or damaged wiring connections
  2. Faulty CAN bus components
  3. Software glitches or programming errors
  4. Malfunctioning Drive Motor Control Module 1 or Battery Energy Control Module
  5. Water or corrosion damage to electrical components

Symptoms of U1847

  1. Loss of power or acceleration
  2. Reduced fuel efficiency
  3. Erratic behavior in electric drive mode
  4. Inability to switch between drive modes
  5. Warning lights on the instrument cluster related to the powertrain or hybrid system

How to Fix U1847

  1. Perform a thorough inspection of the wiring harness and connectors between the Drive Motor Control Module 1 and the Battery Energy Control Module to check for any loose or damaged connections.
  2. Use a diagnostic scan tool to communicate with both modules and identify any error codes or communication issues.
  3. Update the software of the modules to the latest version, if available, to address any potential programming errors.
  4. Replace any faulty CAN bus components or damaged modules that are causing the communication breakdown.
  5. Clear the diagnostic trouble codes and perform a test drive to ensure that the communication between the modules has been restored and the vehicle is operating normally.

Cost to Fix U1847

The typical repair costs for addressing a communication error between the Drive Motor Control Module 1 and the Battery Energy Control Module on the Powertrain Expansion CAN Bus can vary depending on the specific vehicle make and model, as well as the extent of the issue. On average, the repair costs for this type of problem can range from $200 to $800, including parts and labor. It is important to note that diagnostic time and labor rates at auto repair shops can vary, so it is recommended to obtain quotes from multiple shops to ensure a more accurate estimate.

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Code U1847 Information for Specific Makes

  • U1847 Buick — Drive Motor Control Module 1 Lost Communication With Battery Energy Control Module On Powertrain Expansion CAN Bus
  • U1847 Cadillac — Drive Motor Control Module 1 Lost Communication With Battery Energy Control Module On Powertrain Expansion CAN Bus
  • U1847 Chevrolet — Drive Motor Control Module 1 Lost Communication With Battery Energy Control Module On Powertrain Expansion CAN Bus
  • U1847 GMC — Drive Motor Control Module 1 Lost Communication With Battery Energy Control Module On Powertrain Expansion CAN Bus
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 U1847 Code

1. What are the common symptoms of OBDII code U1847?

- Common symptoms include the check engine light coming on, reduced hybrid system performance, and potential drivability issues.

2. What could cause OBDII code U1847 to appear?

- This code usually indicates a communication failure between the Drive Motor Control Module 1 and the Battery Energy Control Module on the Powertrain Expansion CAN Bus.

3. How can I diagnose the cause of OBDII code U1847?

- Diagnosing this code typically involves checking the wiring and connections between the Drive Motor Control Module 1 and the Battery Energy Control Module, as well as verifying the modules themselves are functioning correctly.

4. Can a faulty battery be the cause of OBDII code U1847?

- Yes, a faulty or weak battery can sometimes trigger communication issues between modules, leading to the U1847 code.

5. Are there any repair tips for addressing OBDII code U1847?

- Repair tips may include checking for loose or damaged wiring, ensuring proper module connections, and performing a software update if available.

6. Is it safe to continue driving with OBDII code U1847 present?

- It is generally not recommended to continue driving with this code as it could affect the performance and safety of the vehicle.

7. Can resetting the check engine light resolve OBDII code U1847?

- Resetting the check engine light may temporarily clear the code, but if the underlying issue is not addressed, the code is likely to reappear.

8. How much does it typically cost to repair OBDII code U1847?

- The cost of repair can vary depending on the exact cause of the code and whether any components need to be replaced. It's advisable to consult a professional for an accurate estimate.

9. Will OBDII code U1847 cause a vehicle to fail an emissions test?

- Yes, this code can cause a vehicle to fail an emissions test, as it signifies a problem with the hybrid system that can impact emissions control.

10. Can a DIY enthusiast fix OBDII code U1847, or is it best left to professionals?

- Depending on the severity of the issue and the individual's expertise, some DIY enthusiasts may be able to address the code themselves. However, complex electrical and hybrid system problems are usually best handled by professionals.

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