AutoCodes – Chevrolet – U1831 Chevrolet

U1831 Chevrolet 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 Chevrolet 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.

Save to My Repairs My Repairs

AI answers can be wrong. Verify repairs with testing. Open full chat

Code Popularity 565

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 07, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
Add Comment

💬 Need more help? Ask Coddy for instant answers — it's free!

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

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 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 U1831 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 U1831 Chevrolet code?

Need more information on how to fix the U1831 Chevrolet code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U1831 Chevrolet code diagnosed by a professional: Find a repair shop in your area

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 Chevrolet Code

What does the OBDII code U1831 mean on a Chevrolet?

1. The U1831 code indicates that the Drive Motor Control Module 1 has lost communication with the Hybrid/EV Powertrain Control Module over the Powertrain Expansion CAN Bus. 2.

What are the common symptoms of code U1831 in a Chevrolet?

Symptoms may include the illumination of the check engine light, reduced hybrid or EV performance, inability to switch to EV mode, or complete loss of propulsion. 3.

What causes the U1831 code to appear on a Chevrolet?

Common causes include wiring issues like damaged or corroded CAN bus connections, a faulty Drive Motor Control Module, a malfunctioning Hybrid/EV Powertrain Control Module, or software glitches. 4.

Can a weak 12-volt battery cause the U1831 code on a Chevrolet?

Yes, a weak or failing 12-volt battery can cause communication errors between modules and trigger the U1831 code. 5.

How do you diagnose the U1831 code on a Chevrolet?

Diagnosis involves checking the CAN bus wiring for damage, testing the battery and charging system, inspecting module connectors for corrosion, and using a scan tool to monitor communication between the modules. 6.

Can you still drive with the U1831 code active on a Chevrolet?

Driving may be possible, but it is not recommended as the vehicle may enter a reduced performance mode or fail to operate safely. 7.

How do you fix the U1831 code on a Chevrolet?

Repairs may include fixing damaged wiring, cleaning or replacing corroded connectors, reprogramming or replacing a faulty module, or addressing power supply issues such as a weak battery. 8.

How much does it cost to repair the U1831 code on a Chevrolet?

Repair costs vary but can range from $100 for minor wiring repairs to $1,000 or more if a module replacement or reprogramming is required. 9.

Can a software update fix the U1831 code on a Chevrolet?

Yes, in some cases, a software update for the Hybrid/EV Powertrain Control Module or Drive Motor Control Module may resolve the issue. 10.

What tools are needed to diagnose the U1831 code on a Chevrolet?

Essential tools include a professional-grade scan tool with CAN bus monitoring capabilities, a multimeter for electrical testing, and access to the vehicleâ€™s wiring diagrams.