AutoCodes – GMC – U0231 GMC

U0231 GMC Code - Lost Communication With Rain Sensor Module

Quick Answer

Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Common causes include Faulty Rain Sensor Module, Rain Sensor Module harness is open or shorted, Rain Sensor 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: U0231 GMC indicates Lost Communication With Rain Sensor Module.
Common causes: Common causes include Faulty Rain Sensor Module, Rain Sensor Module harness is open or shorted, Rain Sensor 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 516

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 Apr 05, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U0231 GMC Description

Modules connected to the high speed General Motor Local Area Network (GMLAN) serial data circuits monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. The modules 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 module as an availability indication of the transmitter module. The supervision time-out period is 250 ms. Each message contains the identification number of the transmitter module. The Diagnostic Trouble Code (DTC) sets when a periodic message from the Rain Sensor Module has not been received.

OBDII Code U0231 GMC - Lost Communication With Rain Sensor Module - AutoCodes.com — U0231 GMC Code - Lost Communication With Rain Sensor Module

What does this mean?

What are the Possible Causes of the DTC U0231 GMC?

Faulty Rain Sensor Module
Rain Sensor Module harness is open or shorted
Rain Sensor Module circuit poor electrical connection

How to Fix the DTC U0231 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 U0231 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 U0231 GMC Code

1. What are common symptoms of OBDII code U0231 GMC related to the Lost Communication With Rain Sensor Module?

- Common symptoms include malfunctioning automatic wipers, inoperative rain sensor, and warning lights on the dashboard.

2. What are the possible causes of OBDII code U0231 GMC indicating Lost Communication With Rain Sensor Module?

- The possible causes include a faulty rain sensor module, damaged wiring or connectors, water damage, or a communication network issue.

3. How can I diagnose the issue causing OBDII code U0231 GMC to appear?

- Diagnosis involves checking the rain sensor module for proper function, inspecting wiring and connectors for damage, and using a diagnostic scanner to assess communication on the network.

4. What are some repair tips for resolving OBDII code U0231 GMC related to Lost Communication With Rain Sensor Module?

- Repair tips include repairing or replacing damaged wiring, ensuring proper connection of the rain sensor module, and clearing the code with a diagnostic scanner after resolving the issue.

5. Can I continue driving my vehicle with OBDII code U0231 GMC present?

- It is generally safe to drive the vehicle with this code, but it is recommended to address the issue promptly to ensure the proper functioning of the rain sensor system.

6. Is it possible to reset OBDII code U0231 GMC without fixing the underlying issue?

- While you can clear the code temporarily with a diagnostic scanner, it is important to address the root cause to prevent the code from reappearing.

7. How do I prevent OBDII code U0231 GMC from occurring in the future?

- To prevent the code from occurring again, regularly inspect the rain sensor system, keep connectors clean and dry, and address any water leaks that may affect the rain sensor module.

8. Can a DIY enthusiast fix OBDII code U0231 GMC related to Lost Communication With Rain Sensor Module?

- Depending on your skill level and access to tools, DIY enthusiasts can diagnose and repair this issue by following proper procedures and safety precautions.

9. Are there any recalls or technical service bulletins related to OBDII code U0231 GMC?

- Check with your vehicle manufacturer or authorized dealership for any recalls or technical service bulletins related to the rain sensor module communication issue.

10. How much does it cost to repair OBDII code U0231 GMC caused by Lost Communication With Rain Sensor Module?

- The cost of repair can vary depending on the extent of the issue, but it may involve replacing the rain sensor module, repairing wiring, or addressing communication network problems.