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 found a problem with the sensor that checks the pressure in the brake booster, which helps you stop the car more easily.
The C1023 code is set when the brake booster pressure sensor fails to pass a pulse test conducted by the vehicle's control module.
The brake booster pressure sensor monitors the pressure inside the brake booster, which is crucial for power-assisted braking. If the sensor does not respond correctly during a pulse test, the control module will set the C1023 code.
• Increased effort required to brake
• Illuminated ABS or brake warning light
• Reduced braking performance
• Unusual brake pedal feel
• Faulty brake booster pressure sensor
• Damaged wiring or connectors
• Faulty brake booster
• Control module malfunction
Brake Booster: A component that uses vacuum to help reduce the effort needed to apply the brakes.
Pressure Sensor: A device that measures the pressure of gases or liquids.
• Check for additional codes and address them first.
• Inspect the brake booster pressure sensor and its wiring for damage.
• Test the sensor's electrical connections and output.
• Verify the brake booster is functioning properly.
• Replace the brake booster pressure sensor if faulty.
• Repair or replace damaged wiring or connectors.
• Replace the brake booster if necessary.
• Reprogram or replace the control module if needed.
• OBD-II scanner
• Multimeter
• Brake pressure tester
• Basic hand tools
$150 - $500
Moderate
• Dodge Ram
• Chrysler 300
• Jeep Grand Cherokee
• Regularly inspect brake system components.
• Ensure brake fluid is at the correct level.
• Perform routine maintenance checks.
Sensor Issue
• Do not ignore the brake warning light.
• Have your vehicle inspected by a professional if braking feels different.
• Regularly check your brake system during maintenance.
Check with your vehicle manufacturer; brake components may be covered under a powertrain or bumper-to-bumper warranty.
This code has been reported in vehicles with electronic brake systems, particularly in models with advanced driver-assistance systems.
High – Brake system issues can affect vehicle safety and should be addressed immediately.
Driving with a compromised brake system can be dangerous and is not recommended. Ensure repairs are made promptly.
• Vehicle parked on a level surface
• Engine off and cool
The brake booster pressure sensor is typically located on or near the brake booster, which is usually mounted on the driver's side firewall in the engine compartment.
Q: Can I drive with the C1023 code?
A: It's not advisable to drive with this code as it indicates a potential issue with your braking system, which could affect safety.
Q: How can I reset the C1023 code?
A: After repairs, use an OBD-II scanner to clear the code, but ensure the issue is fixed to prevent it from returning.
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.
View on Amazon
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.
View on Amazon
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.
View on AmazonThese are optional diagnostic tools, not guaranteed fixes. As an Amazon Associate I earn from qualifying purchases.