AutoCodes – Chevrolet – U1048 Chevrolet

U1048 Chevrolet Code - Lost Communications With Rear Wheel Steering Control Module

Quick Answer

Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Common causes include Faulty Rear Wheel Steering Control Module (RWSCM), Rear Wheel Steering Control Module harness is open or shorted, Rear Wheel Steering 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: U1048 Chevrolet indicates Lost Communications With Rear Wheel Steering Control Module.
Common causes: Common causes include Faulty Rear Wheel Steering Control Module (RWSCM), Rear Wheel Steering Control Module harness is open or shorted, Rear Wheel Steering 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 4,704

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 22, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U1048 Chevrolet Description

Modules connected to the class 2 serial data circuit monitor for serial data communications during normal vehicle operation. Operating information and commands are exchanged among the modules. When a module receives a message for a critical operating parameter, the module records the identification number of the module which sent the message for the state of health monitoring/node alive messages. A critical operating parameter is one which, when not received, requires that the module use a default value for that parameter. Once an identification number is learned by a module, it will monitor for that module node alive message. Each module on the class 2 serial data circuit is required to send a Node Alive message every 2 seconds. When no message is detected from a learned identification number for 5 seconds, a Diagnostic Trouble Code (DTC) U1048 is set.

OBDII Code U1048 Chevrolet - Lost Communications With Rear Wheel Steering Control Module - AutoCodes.com — U1048 Chevrolet Code - Lost Communications With Rear Wheel Steering Control Module

What does this mean?

What are the Possible Causes of the DTC U1048 Chevrolet?

Faulty Rear Wheel Steering Control Module (RWSCM)
Rear Wheel Steering Control Module harness is open or shorted
Rear Wheel Steering Control Module circuit poor electrical connection

How to Fix the DTC U1048 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 U1048 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.

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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 U1048 Chevrolet Code

1. What are the common symptoms of OBDII code U1048 in a Chevrolet vehicle?

- Common symptoms may include the rear wheel steering system not functioning properly, warning lights on the dashboard, and potential issues with vehicle stability.

2. What could cause the OBDII code U1048 (Lost Communications With Rear Wheel Steering Control Module) in a Chevrolet?

- Possible causes include a faulty rear wheel steering control module, damaged wiring or connectors, software issues, or a communication system malfunction.

3. How can I diagnose the cause of the U1048 code in my Chevrolet?

- Diagnosing the issue typically involves checking the wiring and connectors for any damage, ensuring proper module connections, and using a diagnostic scanner to communicate with the rear wheel steering control module.

4. Can I still drive my Chevrolet with the U1048 trouble code present?

- It is not recommended to drive the vehicle with the U1048 code as it may affect the performance and safety of the rear wheel steering system.

5. What are some repair tips for fixing the U1048 code in a Chevrolet?

- Repair tips may include checking and repairing any damaged wiring, ensuring proper module connections, clearing the code with a diagnostic scanner, and testing the system for functionality.

6. Is it possible to reset the U1048 trouble code in a Chevrolet without fixing the issue?

- While you can clear the code temporarily, it is essential to address the underlying problem to prevent the code from reappearing and ensure the proper functioning of the rear wheel steering system.

7. How much does it typically cost to repair the U1048 code in a Chevrolet?

- Repair costs can vary depending on the cause of the issue, but they may range from a few hundred to over a thousand dollars, including parts and labor.

8. Can a DIY enthusiast fix the U1048 code in a Chevrolet at home?

- Depending on the cause of the code, some DIY enthusiasts with the necessary tools and knowledge may be able to address the issue at home. However, complex electrical or communication system problems may require professional assistance.

9. Will the U1048 code cause my Chevrolet to fail an emissions test?

- Yes, the U1048 code can cause your Chevrolet to fail an emissions test as it indicates a problem with the rear wheel steering control module, which can impact the vehicle's overall performance and emissions.

10. How long does it take to repair the U1048 code in a Chevrolet?

- The repair time can vary based on the specific cause of the issue, but it may take a few hours to a full day to diagnose, fix, and test the rear wheel steering control module in a Chevrolet.