U1847 GMC Code - Drive Motor Control Module 1 Lost Communication With Battery Energy Control Module On Powertrain Expansion CAN Bus
Quick Answer
The U1847 GMC diagnostic trouble code indicates that the Drive Motor Control Module 1 (DMCM1) has lost communication with the Battery Energy Control Module (BECM) on the Powertrain Expansion Controller Area Network (CAN) bus. Common causes include Faulty wiring or connectors between DMCM1 and BECM, Malfunctioning DMCM1 or BECM, Software glitches in the control modules. 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 GMC indicates Drive Motor Control Module 1 Lost Communication With Battery Energy Control Module On Powertrain Expansion CAN Bus.
- Common causes
- Common causes include Faulty wiring or connectors between DMCM1 and BECM, Malfunctioning DMCM1 or BECM, Software glitches in the control modules.
- 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 U1847 GMC Description
The U1847 GMC diagnostic trouble code indicates that the Drive Motor Control Module 1 (DMCM1) has lost communication with the Battery Energy Control Module (BECM) on the Powertrain Expansion Controller Area Network (CAN) bus. In modern vehicles, the CAN bus is a network that allows different modules and systems within the vehicle to communicate with each other. The DMCM1 is responsible for controlling the drive motor in electric or hybrid vehicles, while the BECM manages the energy flow and storage of the vehicle's battery.
Common Causes of U1847 GMC
- Faulty wiring or connectors between DMCM1 and BECM
- Malfunctioning DMCM1 or BECM
- Software glitches in the control modules
- CAN bus communication issues
- Electrical interference or damage
Symptoms of U1847 GMC
- Loss of power or acceleration
- Erratic behavior of the drive motor
- Warning lights illuminated on the dashboard
- Vehicle stalling or difficulty starting
- Decreased fuel efficiency
How to Fix U1847 GMC
- Perform a comprehensive diagnostic scan to retrieve the trouble codes and identify the specific communication issue.
- Inspect the wiring and connectors between the DMCM1 and BECM for any damage or corrosion. Repair or replace as needed.
- Check the functionality of the DMCM1 and BECM by testing their communication and operation. Replace any faulty modules.
- Update software and firmware in the control modules to ensure compatibility and proper communication.
- Clear the trouble codes, reset the system, and perform a test drive to verify that the communication issue has been resolved.
Cost to Fix U1847 GMC
The typical repair costs for addressing the U1847 GMC code can vary depending on the specific cause of the communication loss. In general, the parts required for this repair, such as wiring, connectors, or control modules, can range from $200 to $800. Labor costs at auto repair shops typically range from $80 to $150 per hour, and the total repair time may vary based on the complexity of the issue. Overall, the total repair cost for resolving the U1847 code could range from $300 to $1200, including parts and labor. It is advisable to consult with a professional mechanic to get an accurate estimate based on the specific circumstances of your vehicle.
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Frequently Asked Questions about U1847 GMC Code
1. What are the common symptoms of OBDII code U1847 in a GMC vehicle?
- Common symptoms include the check engine light illuminating, loss of power, poor fuel efficiency, and difficulty starting the vehicle.
2. What does the OBDII code U1847 for GMC mean?
- This code indicates that the Drive Motor Control Module 1 has lost communication with the Battery Energy Control Module on the Powertrain Expansion CAN Bus.
3. What are possible causes of OBDII code U1847 in a GMC vehicle?
- Possible causes include damaged wiring or connectors, a faulty Battery Energy Control Module, a malfunctioning Drive Motor Control Module 1, or issues with the CAN Bus communication network.
4. How can I diagnose OBDII code U1847 in my GMC vehicle?
- Diagnosing this code typically involves using a diagnostic scanner to retrieve the specific trouble code, checking the wiring and connectors for damage, and testing the Battery Energy Control Module and Drive Motor Control Module 1 for proper functionality.
5. Can I still drive my GMC vehicle with OBDII code U1847?
- It is not recommended to drive the vehicle with this code present, as it can lead to performance issues and potential safety concerns. It's best to address the underlying problem as soon as possible.
6. How can I repair OBDII code U1847 in my GMC vehicle?
- Repairing this code may involve repairing or replacing damaged wiring or connectors, replacing the Battery Energy Control Module or Drive Motor Control Module 1 if necessary, and ensuring proper communication on the CAN Bus network.
7. Will resetting the trouble codes make OBDII code U1847 go away?
- Resetting the trouble codes may temporarily clear the check engine light, but if the underlying issue causing code U1847 is not addressed, the code is likely to reappear.
8. Is it possible to prevent OBDII code U1847 from occurring in my GMC vehicle?
- While some causes of this code may be unavoidable, regular vehicle maintenance, such as checking and maintaining wiring integrity and ensuring proper module functionality, can help prevent this code from occurring.
9. Can a DIY enthusiast repair OBDII code U1847 in a GMC vehicle?
- Depending on the cause of the code, some DIY enthusiasts with the necessary tools and knowledge may be able to address the issue themselves. However, complex electrical or module-related problems may require professional assistance.
10. How much does it typically cost to fix OBDII code U1847 in a GMC vehicle?
- The cost of fixing this code can vary depending on the specific cause and the extent of the repairs needed. Costs may include parts replacement, labor fees, and diagnostic charges, so it's advisable to get a professional assessment for an accurate estimate.
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