Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means there's a problem with the sensor that tells the car's computer where the brake pedal is. It's like when a light switch doesn't work because the wires are loose.
The Brake Pedal Position Sensor Circuit A is responsible for monitoring the position of the brake pedal and sending this information to the vehicle's control modules.
The C0042 code indicates a malfunction in the circuit related to the Brake Pedal Position Sensor. This sensor helps the vehicle's control system understand how much the brake pedal is being pressed. A fault in this circuit can affect braking performance and safety systems like ABS.
• ABS warning light on
• Unresponsive or hard brake pedal
• Inconsistent braking performance
• Faulty brake pedal position sensor
• Damaged or corroded wiring or connectors
• Faulty ABS control module
ABS: Anti-lock Braking System
OBD-II: On-Board Diagnostics II
• Check for any additional error codes.
• Inspect the wiring and connectors for damage or corrosion.
• Test the brake pedal position sensor using a multimeter.
• Replace the brake pedal position sensor.
• Repair or replace damaged wiring or connectors.
• Replace the ABS control module if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$150 - $400
Moderate
• Ford F-150
• Chevrolet Silverado
• Toyota Camry
• Regularly inspect brake system components.
• Ensure connectors and wiring are free from corrosion.
• Perform routine maintenance checks.
Sensor Issue
• Do not ignore the ABS warning light.
• Seek professional repair to ensure safety.
• Avoid driving in hazardous conditions until repaired.
Check vehicle warranty for coverage on brake system components.
This code has been associated with sensor failures and wiring issues in several vehicle models over the years.
High – This code affects braking performance and safety systems.
Driving with a malfunctioning brake system can lead to accidents. Address this issue promptly.
• Vehicle parked on a level surface.
• Ignition in the ON position.
The Brake Pedal Position Sensor is typically located near the brake pedal assembly.
Q: Can I drive with a C0042 code?
A: It's not recommended to drive with this code active as it can affect braking performance.
Q: How do I reset the ABS warning light?
A: Fix the underlying issue first, then use an OBD-II scanner to clear the code.
Pro · Four-system diagnostics
A handheld scanner aimed at engine, transmission, ABS, and airbag diagnostic work.
Chassis and ABS faults usually need a scanner that can read brake-system data directly.
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Universal · Torque wrench
Useful when reassembly torque matters for wheel, suspension, and under-hood fasteners.
Useful when wheel, hub, or suspension hardware needs correct reassembly torque.
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Universal · Drive-on ramps
Helpful for safer access underneath the vehicle during exhaust, EVAP, and underbody inspection work.
Helpful for safer access during underbody inspection work.
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