AutoCodes – Generic – C0042

C0042 Code - Brake Pedal Position Sensor Circuit 'A'

Quick Answer

The Anti-Lock Brake System (ABS) Module monitors the Brake Pedal Position Sensor. Common causes include Faulty Brake Pedal Position Sensor, Brake Pedal Position Sensor harness is open or shorted, Brake Pedal Position 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 indicates Brake Pedal Position Sensor Circuit 'A'.
Common causes: Common causes include Faulty Brake Pedal Position Sensor, Brake Pedal Position Sensor harness is open or shorted, Brake Pedal Position 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 20,055

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 May 02, 2020

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

The Anti-Lock Brake System (ABS) Module monitors the Brake Pedal Position Sensor. The ABS Module sets the OBDII code when the Brake Pedal Position Sensor is not to factory specifications.

OBDII Code C0042 - Brake Pedal Position Sensor Circuit 'A' - AutoCodes.com — C0042 Code - Brake Pedal Position Sensor Circuit 'A'

What does this mean?

What are the Possible Causes of the DTC C0042?

Faulty Brake Pedal Position Sensor
Brake Pedal Position Sensor harness is open or shorted
Brake Pedal Position Sensor circuit poor electrical connection

How to Fix the DTC C0042?

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 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 C0042 code?

Need more information on how to fix the C0042 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the C0042 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

C0042 Buick — Right Front Wheel Speed Sensor Circuit Low
C0042 Cadillac — Right Front Wheel Speed Sensor Circuit Low
C0042 Chevrolet — Right Front Wheel Speed Sensor Circuit Low
C0042 Chrysler — Brake Pedal Position Sensor Circuit 'A'
C0042 Dodge — Brake Pedal Position Sensor Circuit 'A'
C0042 GMC — Right Front Wheel Speed Sensor Circuit Low
C0042 Jeep — Brake Pedal Position Sensor Circuit 'A'
C0042 Subaru — Power Supply Voltage Failure

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 Code

What does the OBDII code C0042 mean?

C0042 indicates an issue with the Brake Pedal Position Sensor Circuit 'A,' which monitors the position of the brake pedal and communicates with the vehicle's control systems.

What are the symptoms of the C0042 code?

Common symptoms include the ABS or brake warning light being illuminated, erratic braking behavior, or loss of certain braking system functions.

What causes the C0042 code?

Possible causes include a faulty brake pedal position sensor, damaged wiring or connectors in the sensor circuit, or issues with the ABS control module.

Can I drive my vehicle with the C0042 code?

While the vehicle may still be drivable, it is not recommended as braking performance could be compromised, increasing the risk of an accident.

How is the C0042 code diagnosed?

Technicians use an OBDII scanner to confirm the code, then inspect the wiring, connectors, and brake pedal position sensor for damage or faults.

How do you fix the C0042 code?

Repairs may involve replacing the brake pedal position sensor, repairing damaged wiring, or reprogramming or replacing the ABS control module.

What tools are needed to repair the C0042 code?

Common tools include an OBDII scanner, multimeter for testing circuits, and basic hand tools for sensor replacement or wiring repairs.

Can a weak battery cause the C0042 code?

Yes, a weak or failing battery can cause voltage inconsistencies that might trigger the code or exacerbate communication issues.

How much does it cost to repair the C0042 code?

Repair costs vary depending on the issue but typically range from $100 to $300 for sensor replacement and wiring repairs.

What happens if I ignore the C0042 code?

Ignoring the code can lead to reduced braking performance, compromised safety features, and potential damage to other components in the braking system.