AutoCodes – GMC – U1831 GMC

U1831 GMC Code - Drive Motor Control Module 1 Lost Communication With Hybrid/EV Powertrain Control Module On Powertrain Expansion CAN Bus

Quick Answer

The serial data circuit is the means by which the devices in the vehicle communicate with each other. Common causes include Faulty Hybrid/EV Powertrain Control Module, Hybrid/EV Powertrain Control Module harness is open or shorted, Hybrid/EV Powertrain 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: U1831 GMC indicates Drive Motor Control Module 1 Lost Communication With Hybrid/EV Powertrain Control Module On Powertrain Expansion CAN Bus.
Common causes: Common causes include Faulty Hybrid/EV Powertrain Control Module, Hybrid/EV Powertrain Control Module harness is open or shorted, Hybrid/EV Powertrain 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 542

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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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 U1831 GMC Description

The serial data circuit is the means by which the devices in the vehicle communicate with each other. Once the scan tool is connected to the serial data circuit through the Data Link Connector (DLC), the scan tool can be used to monitor each device for diagnostic purposes and to check for Diagnostic Trouble Code (DTC). When the vehicle is ON, each device communicating on the serial data circuit sends a state of health message to ensure that the device is operating properly. When a device stops communicating on the serial data circuit, for example, if the device loses power or ground, the state of health message it normally sends on the serial data circuit disappears. Other devices on the serial data circuit, which expect to receive that state of the health message, detect its absence; those devices in turn set a DTC associated with the loss of the state of health of the non-communicating device. A loss of serial data communications DTC does not represent a failure of the devices that contain the stored DTC. The DTC will set when a supervised periodic message that includes the transmitter device availability has not been received.

OBDII Code U1831 GMC - Drive Motor Control Module 1 Lost Communication With Hybrid/EV Powertrain Control Module On Powertrain Expansion CAN Bus - AutoCodes.com — U1831 GMC Code - Drive Motor Control Module 1 Lost Communication With Hybrid/EV Powertrain Control Module On Powertrain Expansion CAN Bus

What does this mean?

What are the Possible Causes of the DTC U1831 GMC?

Faulty Hybrid/EV Powertrain Control Module
Hybrid/EV Powertrain Control Module harness is open or shorted
Hybrid/EV Powertrain Control Module circuit poor electrical connection

How to Fix the DTC U1831 GMC?

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 U1831 GMC 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 U1831 GMC Code

1. What are common symptoms of OBDII code U1831 in a GMC vehicle?

- Common symptoms include loss of communication between the Drive Motor Control Module 1 and the Hybrid/EV Powertrain Control Module, reduced hybrid system performance, and illuminated warning lights on the dashboard.

2. What could cause the U1831 code to appear in a GMC vehicle?

- The U1831 code typically appears due to a communication issue between the Drive Motor Control Module 1 and the Hybrid/EV Powertrain Control Module, which can be caused by wiring issues, loose connections, or faulty control modules.

3. How can I diagnose the U1831 code in my GMC vehicle?

- To diagnose the U1831 code, it is recommended to perform a thorough inspection of the wiring harnesses, connectors, and modules involved in the communication between the Drive Motor Control Module 1 and the Hybrid/EV Powertrain Control Module.

4. What are some repair tips for resolving the U1831 code in a GMC vehicle?

- Repair tips for resolving the U1831 code may include repairing or replacing damaged wiring, ensuring all connections are secure, resetting fault codes, and updating software if necessary.

5. Can I drive my GMC vehicle with the U1831 code present?

- It is not recommended to drive your GMC vehicle with the U1831 code present, as it may lead to further issues with the hybrid system's performance and safety. It is best to address the problem promptly.

6. Is it possible to reset the U1831 code in a GMC vehicle without repairing the issue?

- While you can clear the U1831 code with an OBDII scanner, it is important to address the underlying cause of the code to prevent it from reoccurring and potentially causing more severe problems.

7. How much does it typically cost to repair the U1831 code in a GMC vehicle?

- The cost to repair the U1831 code can vary depending on the specific cause of the issue, but it may involve labor costs for diagnosis and repair, as well as potential expenses for parts replacement.

8. Are there any recalls or technical service bulletins related to the U1831 code in GMC vehicles?

- It is advisable to check with a GMC dealership or visit the manufacturer's website to see if there are any recalls or technical service bulletins related to the U1831 code in your specific vehicle model.

9. Can a DIY enthusiast repair the U1831 code issue in a GMC vehicle?

- While some individuals with automotive repair experience may be able to diagnose and repair the U1831 code, it is recommended to consult with a professional mechanic or dealership for accurate diagnosis and safe repair.

10. How can I prevent the U1831 code from appearing in my GMC vehicle in the future?

- To prevent the U1831 code from reoccurring, it is essential to perform regular maintenance checks, ensure all electrical connections are secure, and address any warning lights or unusual symptoms promptly to avoid potential issues with the hybrid system.