Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
The car's computer is getting a confusing signal from the sensor that checks the pressure in the brake booster, which helps make braking easier.
The brake booster pressure sensor sends information about the pressure in the brake booster to the car's computer. If the signal is not what the computer expects, it triggers this code.
The C1027 code indicates that the signal from the brake booster pressure sensor is outside the expected range or is inconsistent with other sensor data. This can affect the vehicle's braking performance.
• ABS warning light on
• Reduced braking performance
• Unusual brake pedal feel
• Faulty brake booster pressure sensor
• Wiring issues such as open or short circuits
• Faulty brake booster
Brake Booster: A device that uses vacuum pressure to help reduce the effort needed to apply the brakes.
Sensor: A device that detects or measures a physical property and records, indicates, or otherwise responds to it.
• Use a scan tool to confirm the C1027 code.
• Inspect the brake booster pressure sensor and its wiring for damage.
• Test the sensor's output with a multimeter.
• Replace the brake booster pressure sensor if faulty.
• Repair or replace damaged wiring.
• Replace the brake booster if necessary.
• OBD-II scan tool
• Multimeter
• Basic hand tools
$150 - $400
Moderate
• Chrysler 300
• Dodge Charger
• Jeep Grand Cherokee
• Regularly inspect brake system components.
• Ensure all electrical connections are secure.
• Perform routine brake system maintenance.
Sensor Issue
• Do not ignore the ABS warning light.
• Have the brake system inspected by a professional if unsure.
• Avoid driving aggressively until the issue is resolved.
Check with the vehicle manufacturer for specific warranty coverage related to brake system components.
This code has been reported in vehicles with advanced braking systems, often related to 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. Address any brake-related warnings immediately to ensure safety.
• Vehicle stationary
• Engine running
The brake booster pressure sensor is typically located near the brake booster, which is usually found on the driver's side of the engine compartment.
Q: Can I drive with the C1027 code?
A: It's not recommended to drive with this code active, as it can affect braking performance and safety.
Q: How do I reset the C1027 code?
A: After repairs, use an OBD-II scanner to clear the code. If the issue is fixed, it 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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