Electronic Parking Brake Force Sensor Malfunction
What does C0273 mean?
The C0273 code means the vehicle's onboard diagnostic system has detected: Electronic Parking Brake Force Sensor Malfunction. This is a moderate severity code.
Common Symptoms
- Parking brake warning light on
- Parking brake clamp force inconsistent
- Parking brake may not hold on steep hills
- Warning message on dashboard
- Parking brake takes multiple attempts to fully engage
Probable Causes (Ranked by Likelihood)
- Failed parking brake force or position sensor Very High
- Corroded sensor connector at the caliper High
- Parking brake caliper mechanism worn or damaged Moderate
- Wiring fault between sensor and module Moderate
- Parking brake module calibration error Low
Step-by-Step Diagnostic Procedure
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Scan for DTCs and check which side is reporting the force sensor fault
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Inspect the caliper actuator connector for corrosion
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Check parking brake pad thickness -- worn pads require more actuator travel
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Test force sensor signal with a scan tool while commanding parking brake apply
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Verify the parking brake mechanism inside the caliper is not seized or worn
Frequently Asked Questions
What does the parking brake force sensor do?
The force sensor measures how tightly the parking brake caliper is clamping the brake rotor. The module uses this feedback to ensure adequate clamping force is applied to prevent the vehicle from rolling.
Can worn brake pads cause a force sensor code?
Yes. When parking brake pads are worn, the actuator must extend further to achieve proper clamping force. If the pads are too thin, the actuator may reach its travel limit before adequate force is achieved, triggering this code.
How do I know if my parking brake is holding properly?
Park on a moderate incline, engage the parking brake, and release the service brake pedal. The vehicle should not roll. If it creeps or the warning light comes on, the parking brake force may be insufficient.