Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
This code means that the car's computer is seeing a problem with the sensor that measures how hard you press the brake pedal. It's like the sensor is saying the brakes are being pressed really hard, even if they're not.
The brake pressure sensor measures the pressure applied to the brake system. A 'Circuit High' error indicates that the sensor is reading a higher voltage than expected, suggesting a potential issue with the sensor or its circuit.
The C0642 code is triggered when the vehicle's control module detects a voltage signal from the brake pressure sensor that is higher than the pre-determined range. This could be due to a malfunctioning sensor, wiring issues, or a fault in the control module.
• Brake warning light on the dashboard
• Inconsistent brake pedal feel
• ABS system may not function properly
• Faulty brake pressure sensor
• Wiring issues in the sensor circuit
• Malfunctioning control module
OBD-II: On-Board Diagnostics, a system to monitor vehicle performance.
ABS: Anti-lock Braking System, helps prevent wheel lock-up during braking.
• Use an OBD-II scanner to confirm the code.
• Inspect the brake pressure sensor and its wiring for damage.
• Test the voltage and ground signals at the sensor.
• Replace the brake pressure sensor if faulty.
• Repair or replace damaged wiring or connectors.
• Reprogram or replace the control module if necessary.
• OBD-II scanner
• Multimeter
• Basic hand tools
$100 - $300
Moderate
• Chevrolet Silverado
• GMC Sierra
• Cadillac Escalade
• Regularly inspect brake system components.
• Ensure proper maintenance of electrical connections.
• Avoid harsh driving conditions that may affect brake components.
Sensor Issue
• Do not ignore the brake warning light.
• Get the vehicle checked by a professional if you experience braking issues.
Check with the manufacturer for specific warranty coverage on brake system components.
This code is commonly found in vehicles with electronic brake control systems and is often associated with sensor or wiring issues.
High – Brake system issues can affect vehicle safety and should be addressed promptly.
Driving with a malfunctioning brake system can be dangerous and may violate safety regulations.
• Vehicle stationary with ignition on
• Brake pedal not pressed
The brake pressure sensor is typically located near the master cylinder or within the ABS module.
Q: Can I drive with a C0642 code?
A: It's not recommended to drive with this code as it may indicate a brake system issue that could affect safety.
Q: How do I reset the C0642 code?
A: After repairs, use an OBD-II scanner to clear the code. If the issue is fixed, the code should not return.
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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