A failing brake pressure sensor on circuit F that is drifting or producing an erratic signal.; Corroded, loose, or damaged wiring and connectors between the sensor and the ABS module.; Low brake fluid level or air trapped in the hydraulic system causing pressure readings outside the expected range.; A weak or failing ABS module that misinterprets a valid sensor signal.; A restricted or leaking brake hydraulic component that prevents pressure from building or holding as expected.; Electrical interference or a poor ground connection affecting the sensor reference voltage.; A sensor that has been contaminated by debris or moisture in the brake fluid.

DTC codes / C05xx · Brakes, steering and suspension / C05C5

C05C5Brake Pressure Sensor F Circuit Range/Performance

Q: What does code C05C5 mean?

Brake Pressure Sensor F Circuit Range/Performance. C05C5 means the antilock braking system (ABS) module has detected that the brake pressure sensor on circuit F is reporting a voltage or signal that falls outside the expected range for the current driving conditions. The computer compares the sensor's output against other pressure and speed inputs and flags a range or performance fault when the signal is implausible, stuck, or erratic rather than completely open or shorted.

C05C5 means the antilock braking system (ABS) module has detected that the brake pressure sensor on circuit F is reporting a voltage or signal that falls outside the expected range for the current driving conditions. The computer compares the sensor's output against other pressure and speed inputs and flags a range or performance fault when the signal is implausible, stuck, or erratic rather than completely open or shorted.

SystemChassis

Code typeGeneric (all makes)

SeverityMedium

Fix difficultyIntermediate

AreaBrakes, steering and suspension

Symptoms you may notice

The ABS warning light and often the traction control light illuminate on the dashboard.
The brake pedal may feel firmer, softer, or less consistent than usual during normal stops.
ABS or stability control may be disabled, and the system may not intervene during hard braking.
A generic brake system warning light may appear alongside the ABS light on some vehicles.
Often no symptoms besides the warning light, with normal brake feel and performance in everyday driving.
In some cases, cruise control or hill-start assist may become unavailable because those systems rely on brake pressure data.

Common causes, most likely first

A failing brake pressure sensor on circuit F that is drifting or producing an erratic signal.
Corroded, loose, or damaged wiring and connectors between the sensor and the ABS module.
Low brake fluid level or air trapped in the hydraulic system causing pressure readings outside the expected range.
A weak or failing ABS module that misinterprets a valid sensor signal.
A restricted or leaking brake hydraulic component that prevents pressure from building or holding as expected.
Electrical interference or a poor ground connection affecting the sensor reference voltage.
A sensor that has been contaminated by debris or moisture in the brake fluid.

How to diagnose and fix it

Check the brake fluid level and inspect for leaks around the master cylinder, calipers, and lines.
Inspect the brake pressure sensor connector and wiring for corrosion, chafing, or loose pins, and clean or repair as needed.
Use a scan tool to read live brake pressure sensor data and compare it with actual pedal application to confirm an implausible signal.
Perform a voltage drop test on the sensor reference and ground circuits to rule out wiring resistance.
Bleed the brake system thoroughly if air or moisture is suspected, then recheck the sensor reading.
Replace the brake pressure sensor if live data confirms it is out of range or erratic after electrical checks.
Clear the code and perform a road test to verify the repair, and reprogram or relearn the ABS module if required by the manufacturer.

What the brake pressure sensor code hides

A brake pressure sensor can pass a simple resistance check and still set C05C5 because the fault is intermittent and only appears under specific pressure or temperature conditions.
Low brake fluid or air in the system is a commonly overlooked cause that mimics a failed sensor, so always verify hydraulic integrity before replacing parts.
The ABS module may set this code based on a plausibility comparison with wheel speed sensors, so a failing wheel speed sensor can occasionally trigger related pressure codes.
Aftermarket brake pads or rotors that change pedal travel can sometimes push the sensor signal just outside the learned range, especially if the system has not been recalibrated.
C05C5 does not always mean the sensor is dead; a poor ground or reference voltage fault at the ABS module can produce the same range/performance error.

Can I keep driving with C05C5?

You can usually drive the vehicle to a repair shop, but avoid hard braking or emergency stops because ABS and stability control may not function. If the brake pedal feels abnormal or the fluid level is low, stop driving and have the vehicle inspected immediately.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.