AutoCodes – Generic – U042B

U042B Code - Invalid Data Received From Chassis Control Module

Quick Answer

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Common causes include Faulty Chassis Control Module, Chassis Control Module harness is open or shorted, Chassis 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: U042B indicates Invalid Data Received From Chassis Control Module.
Common causes: Common causes include Faulty Chassis Control Module, Chassis Control Module harness is open or shorted, Chassis 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 8,100

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 12, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code U042B Description

A Controller Area Network (CAN) is a vehicle bus standard designed to interconnect automotive devices without a host computer. Operating information and commands are exchanged among the devices. The devices have programmed information about what messages are needed to be exchanged on the serial data circuits. Some devices are constantly receiving information from other devices through serial data communication network. The invalid data Diagnostic Trouble Code (DTC) will be set when a receiving device detects a discrepancy in the information it receives from the Chassis Control Module causing its integrity to be questioned.

OBDII Code U042B - Invalid Data Received From Chassis Control Module - AutoCodes.com — U042B Code - Invalid Data Received From Chassis Control Module

What does this mean?

What are the Possible Causes of the DTC U042B?

Faulty Chassis Control Module
Chassis Control Module harness is open or shorted
Chassis Control Module circuit poor electrical connection

How to Fix the DTC U042B?

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 U042B 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 U042B code?

Need more information on how to fix the U042B code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the U042B code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

U042B Buick — Invalid Data Received From Chassis Control Module
U042B Cadillac — Invalid Data Received From Chassis Control Module
U042B Chevrolet — Invalid Data Received From Chassis Control Module
U042B GMC — Invalid Data Received From Chassis Control Module

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 U042B Code

1. What are the common symptoms of OBDII code U042B (Invalid Data Received From Chassis Control Module)?

- Common symptoms include issues with the ABS system, traction control problems, and illuminated warning lights on the dashboard.

2. What are the possible causes of OBDII code U042B?

- The code U042B can be triggered by faulty wiring, a malfunctioning chassis control module, a software glitch, or communication network issues within the vehicle.

3. How can I diagnose the cause of OBDII code U042B?

- Diagnosis involves using a professional OBDII scanner to retrieve the code, checking for other related codes, inspecting the wiring and connections, and performing a thorough system scan.

4. Can I continue driving with OBDII code U042B active?

- It is not recommended to drive with this code active as it may affect the safety systems of the vehicle. It's best to address the issue promptly.

5. How can I fix OBDII code U042B at home?

- Fixing this code at home may involve checking and repairing damaged wiring, ensuring proper connections, or resetting the chassis control module. However, complex repairs might require professional assistance.

6. Is it safe to clear the OBDII code U042B without fixing the underlying issue?

- Clearing the code without fixing the underlying issue is not recommended as it may lead to recurring problems and potentially compromise the safety features of the vehicle.

7. Can a low battery voltage trigger OBDII code U042B?

- Yes, low battery voltage can sometimes cause communication errors and trigger code U042B. It's advisable to check and ensure the battery is in good condition.

8. Will resetting the system clear OBDII code U042B permanently?

- Resetting the system may clear the code temporarily, but if the underlying issue is not addressed, the code is likely to reappear once the problem resurfaces.

9. How much does it typically cost to repair OBDII code U042B at a dealership or repair shop?

- The cost of repairing OBDII code U042B can vary depending on the root cause. Repairs may range from a simple fix like reconnecting a loose wire to more complex issues that require replacement of components, potentially costing hundreds of dollars.

10. Is it necessary to visit a dealership for OBDII code U042B diagnosis and repair, or can an independent mechanic handle it?

- An independent mechanic with experience in diagnosing and repairing OBDII issues should be able to handle code U042B effectively. Dealership services may be preferred for vehicles under warranty or for specific technical expertise.