U1879 Code - Drive Motor Control Module 2 Lost Communication With Engine Control Module
Quick Answer
The U1879 code indicates that there is a communication problem between the Drive Motor Control Module 2 (DMCM2) and the Engine Control Module (ECM) in the vehicle. Common causes include Faulty wiring or connectors, Malfunctioning DMCM2, Malfunctioning ECM. 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
- U1879 indicates Drive Motor Control Module 2 Lost Communication With Engine Control Module.
- Common causes
- Common causes include Faulty wiring or connectors, Malfunctioning DMCM2, Malfunctioning ECM.
- 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 U1879 Description
The U1879 code indicates that there is a communication problem between the Drive Motor Control Module 2 (DMCM2) and the Engine Control Module (ECM) in the vehicle. This communication breakdown can result in a lack of coordination between these two essential modules, which can have a significant impact on the vehicle's performance and overall functionality.
Common Causes of U1879
- Faulty wiring or connectors
- Malfunctioning DMCM2
- Malfunctioning ECM
- Electrical interference
- Software issues
Symptoms of U1879
- Engine misfires or hesitation
- Reduced fuel efficiency
- Stalling of the vehicle
- Illumination of the check engine light
- Loss of power while driving
How to Fix U1879
- Diagnose the root cause of the communication issue between the DMCM2 and ECM using a diagnostic scanner.
- Inspect the wiring and connectors for any damage or corrosion, and repair or replace as needed.
- Test the DMCM2 and ECM for proper functionality and replace any faulty components.
- Clear the code from the vehicle's system using the diagnostic scanner.
- Test drive the vehicle to ensure that the communication issue has been resolved and that the symptoms associated with the U1879 code have been eliminated.
Cost to Fix U1879
The typical repair costs for addressing the U1879 code can range from $200 to $500, including parts and labor. However, it is important to note that the specific diagnosis time and labor rates at auto repair shops can vary significantly based on factors such as location, vehicle make and model, and engine type. Rates in metropolitan areas or at dealerships may be higher, while independent shops often charge less. It is advisable to check local rates for a more precise estimate before proceeding with the repair.
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Code U1879 Information for Specific Makes
- U1879 Buick — Drive Motor Control Module 2 Lost Communication With Engine Control Module
- U1879 Cadillac — Drive Motor Control Module 2 Lost Communication With Engine Control Module
- U1879 Chevrolet — Drive Motor Control Module 2 Lost Communication With Engine Control Module
- U1879 GMC — Drive Motor Control Module 2 Lost Communication With Engine Control Module
Frequently Asked Questions about U1879 Code
1. What are common symptoms of OBDII code U1879?
- Common symptoms include the Check Engine Light (CEL) illuminating, loss of power, rough running engine, and potential issues with vehicle performance.
2. What can cause OBDII code U1879 to trigger?
- This code can be triggered by a communication breakdown between the Drive Motor Control Module 2 and the Engine Control Module, which may be caused by wiring issues, faulty modules, or software glitches.
3. How do I diagnose the cause of U1879 code?
- Diagnosis typically involves checking the wiring connections between the modules, testing the modules for functionality, and using a diagnostic scanner to retrieve additional fault codes and data.
4. Can I still drive my vehicle with code U1879 present?
- It is not recommended to drive your vehicle with this code present, as it may lead to further issues with engine control and performance.
5. How can I repair OBDII code U1879?
- Repairing this code often involves fixing any wiring issues, replacing faulty modules, updating software as needed, and clearing the code with a diagnostic scanner.
6. Is it possible to prevent code U1879 from recurring?
- Regular maintenance, checking and maintaining wiring connections, and addressing any related issues promptly can help prevent the recurrence of this code.
7. Can a DIY enthusiast fix OBDII code U1879 at home?
- Depending on your mechanical skills and access to tools, you may be able to address some aspects of this code at home. However, more complex issues may require professional help.
8. Are there any safety concerns associated with code U1879?
- While this code itself may not pose immediate safety risks, driving with unresolved communication issues between critical control modules can potentially lead to unsafe driving conditions.
9. Is it necessary to reset the code after repairs are made?
- Yes, it is important to clear the code after repairs are made to ensure that the issue has been resolved and to prevent further confusion during future diagnostics.
10. How much does it typically cost to fix OBDII code U1879?
- The cost of repairs for this code can vary depending on the underlying cause, parts needed, and labor charges. It is recommended to obtain quotes from different repair shops for accurate pricing.
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