AutoCodes – Chevrolet – U1879 Chevrolet

U1879 Chevrolet Code - Drive Motor Control Module 2 Lost Communication With Engine Control Module

Quick Answer

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Engine Control Module (ECM), Engine Control Module harness is open or shorted, Engine 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: U1879 Chevrolet indicates Drive Motor Control Module 2 Lost Communication With Engine Control Module.
Common causes: Common causes include Faulty Engine Control Module (ECM), Engine Control Module harness is open or shorted, Engine 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 681

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 08, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1879 Chevrolet Description

Devices connected to the serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the devices. The devices have prerecorded information about what messages are needed to be exchanged on the serial data circuits, for each virtual network. The messages are supervised and also, some periodic messages are used by the receiver device as an availability indication of the transmitter device. Each message contains the identification number of the transmitter device. The Diagnostic Trouble Code (DTC) will set if a supervised periodic message that includes the transmitter device availability has not been received.

OBDII Code U1879 Chevrolet - Drive Motor Control Module 2 Lost Communication With Engine Control Module - AutoCodes.com — U1879 Chevrolet Code - Drive Motor Control Module 2 Lost Communication With Engine Control Module

What does this mean?

What are the Possible Causes of the DTC U1879 Chevrolet?

Faulty Engine Control Module (ECM)
Engine Control Module harness is open or shorted
Engine Control Module circuit poor electrical connection

How to Fix the DTC U1879 Chevrolet?

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 U1879 Chevrolet 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.

Need more information about the U1879 Chevrolet code?

Need more information on how to fix the U1879 Chevrolet code? Get Access to Factory Service Manuals

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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 U1879 Chevrolet Code

1. What are the common symptoms of OBDII code U1879 in a Chevrolet?

- Common symptoms include poor engine performance, rough idling, stalling, and illuminated warning lights on the dashboard.

2. What can cause the U1879 code in a Chevrolet?

- The U1879 code typically occurs when there is a communication error between the Drive Motor Control Module 2 and the Engine Control Module, which can be caused by wiring issues, faulty modules, or software glitches.

3. How serious is the U1879 code in a Chevrolet?

- The U1879 code should be addressed promptly as it can lead to drivability issues and potential safety concerns if left unresolved.

4. How can I diagnose the U1879 code in a Chevrolet?

- Diagnosing the U1879 code requires using a professional OBDII scanner to retrieve the trouble codes and conducting a thorough inspection of the wiring connections between the Drive Motor Control Module 2 and Engine Control Module.

5. Can I still drive my Chevrolet with the U1879 code?

- It is not recommended to drive your Chevrolet with the U1879 code present, as it can lead to further damage to the vehicle and compromise safety.

6. What are some repair tips for the U1879 code in a Chevrolet?

- Repair tips include checking and repairing any damaged wiring, ensuring proper connections between modules, and updating software as recommended by Chevrolet.

7. How much does it cost to repair the U1879 code in a Chevrolet?

- The cost of repairing the U1879 code can vary depending on the exact cause of the issue, but it may involve replacing faulty modules, repairing wiring, or updating software, which can range from a few hundred to a few thousand dollars.

8. Can I reset the U1879 code in a Chevrolet on my own?

- While you can clear the trouble codes using an OBDII scanner, it is important to address the underlying issue causing the U1879 code to prevent it from reoccurring.

9. Is the U1879 code covered under Chevrolet's warranty?

- Whether the U1879 code is covered under warranty depends on the age and mileage of your Chevrolet, so it's recommended to check with your dealership or refer to your warranty information.

10. How can I prevent the U1879 code from appearing in my Chevrolet?

- To prevent the U1879 code, it's essential to stay up to date on regular maintenance, address any warning lights promptly, and ensure proper care and inspection of the vehicle's electrical components.