AutoCodes – GMC – C0042 GMC

C0042 GMC Code - Right Front Wheel Speed Sensor Circuit Low

Quick Answer

The Wheel Speed Sensor (WSS) receives ignition voltage from the Electronic Brake Control Module (EBCM) and provides a DC square wave signal back to the module. Common causes include Faulty Right Front Wheel Speed Sensor, Right Front Wheel Speed Sensor harness is open or shorted, Right Front Wheel Speed Sensor 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: C0042 GMC indicates Right Front Wheel Speed Sensor Circuit Low.
Common causes: Common causes include Faulty Right Front Wheel Speed Sensor, Right Front Wheel Speed Sensor harness is open or shorted, Right Front Wheel Speed Sensor 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 2,486

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 Oct 24, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code C0042 GMC Description

The Wheel Speed Sensor (WSS) receives ignition voltage from the Electronic Brake Control Module (EBCM) and provides a DC square wave signal back to the module. As the wheel spins, the EBCM uses the frequency of the square wave signal to calculate the wheel speed.

OBDII Code C0042 GMC - Right Front Wheel Speed Sensor Circuit Low - AutoCodes.com — C0042 GMC Code - Right Front Wheel Speed Sensor Circuit Low

What does this mean?

What are the Possible Causes of the DTC C0042 GMC?

Faulty Right Front Wheel Speed Sensor
Right Front Wheel Speed Sensor harness is open or shorted
Right Front Wheel Speed Sensor circuit poor electrical connection

How to Fix the DTC C0042 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 C0042 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 C0042 GMC Code

1. What are the common symptoms of OBDII code C0042 GMC (Right Front Wheel Speed Sensor Circuit Low)?

The common symptoms include the ABS light illuminating on the dashboard, traction control system issues, and potential loss of ABS functionality.

2. What are the possible causes of OBDII code C0042 GMC?

Possible causes include a faulty right front wheel speed sensor, damaged wiring or connectors in the circuit, corrosion, or a damaged tone ring.

3. How can I diagnose the cause of OBDII code C0042 GMC?

Diagnosis typically involves checking the right front wheel speed sensor wiring and connector for damage, testing the sensor itself for proper functionality, and inspecting the tone ring for any issues.

4. Can a DIY enthusiast repair OBDII code C0042 GMC?

Depending on your skill level, you may be able to repair this code by replacing the right front wheel speed sensor or addressing any wiring issues. However, professional diagnosis and repair are recommended for accurate resolution.

5. Is it safe to drive with OBDII code C0042 GMC present?

It is not recommended to drive with this code active, as it can affect the proper functioning of the ABS system, potentially compromising vehicle safety.

6. How much does it typically cost to repair OBDII code C0042 GMC?

The cost of repair can vary depending on the underlying issue. Replacing a faulty wheel speed sensor may cost between $100 to $200, while addressing wiring or connector problems may incur additional labor costs.

7. Can weather conditions affect the occurrence of OBDII code C0042 GMC?

Extreme weather conditions, such as heavy rain or snow, can potentially exacerbate issues with the wheel speed sensor circuit, leading to the triggering of this code.

8. How long does it take to repair OBDII code C0042 GMC?

The repair time can vary depending on the extent of the issue and the availability of parts. Simple sensor replacements may take an hour or two, while more complex wiring repairs could take longer.

9. Will OBDII code C0042 GMC clear itself after the issue is fixed?

In some cases, once the underlying issue is repaired, the code may clear itself after a few drive cycles. However, it is recommended to use an OBDII scanner to reset the code for immediate resolution.

10. Can OBDII code C0042 GMC impact vehicle performance?

While this code may not directly impact engine performance, it can affect the ABS system's operation, potentially compromising braking performance and vehicle stability in certain driving conditions.