C0025

Code

Generic C — Chassis

Brake Pedal Feedback Pressure Sensor Circuit

Brand: Generic

Type: C — Chassis

Views: UK: 27 EN: 38 RU: 29

AI status

Completed

ready

Completed 100%

Page language: EN

Causes

Open or short in sensor wiring harness
Corroded, loose or contaminated connector at sensor or module
Failed brake pedal feedback/pressure sensor
Poor ground or reference voltage to sensor
Intermittent wiring due to chafing or damaged insulation
Low battery or unstable system voltage during detection

Symptoms

ABS or brake warning lamp illuminated
Reduced or altered brake pedal feel (soft, spongy, or reduced feedback)
Brake system may enter limp or degraded mode (reduced brake assist)
Stored and repeating DTC C0025 (may be accompanied by other brake-related codes)
Possible inability to complete brake system self-check or calibrations

What to check

Read and record freeze-frame and related DTCs with a scan tool
Do not drive if brakes are impaired; perform tests with vehicle secured
Visually inspect sensor, connector, and wiring for damage, corrosion, water intrusion, or loose pins
Verify battery voltage and charging system (unstable supply can cause false faults)
Backprobe sensor connector: verify reference voltage (usually 5 V or vehicle-specific), ground continuity, and signal wire behaviour
Monitor live data while operating brake pedal to observe signal change and plausibility

Signal parameters

Most brake pedal feedback/pressure sensors are 3‑wire: reference (typically 5 V), ground, and signal
At rest signal voltage: commonly ~0.5–1.5 V (vehicle dependent)
Under normal pedal pressure: signal rises roughly linearly up to ~4.0–4.5 V (dependent on sensor design)
If signal is stuck near 0 V, reference voltage, or battery voltage, suspect open, short-to-power, or short-to-ground respectively
Resistance ranges vary by sensor design; consult vehicle service data for exact values

Diagnostic algorithm

Retrieve all stored codes and freeze-frame; note any related brake/ABS codes.
Perform visual inspection of sensor, connector and harness for damage, corrosion, or contamination.
Verify battery voltage >=12.4 V with engine off and charging system healthy with engine running.
With safe access, backprobe the sensor connector: confirm proper reference voltage and ground present at connector with key on.
Monitor live signal voltage while slowly applying brake pedal. Confirm voltage changes smoothly through expected range (rest to applied).
If signal absent or out of range, perform continuity and resistance checks from sensor connector to ABS/brake module to locate opens or shorts. Check for shorts to ground and battery positive.
Wiggle the harness and connector while monitoring signal to find intermittent faults.
If wiring and connector are good but signal out of range, replace the brake pedal feedback/pressure sensor. Use OEM-equivalent part.
After replacement or repair, clear codes and perform any required sensor/pedal calibration or relearn per service manual.
If fault persists after sensor and harness repairs, consider module diagnostics (update software, test module inputs/grounds) using manufacturer procedures.

Likely causes

Damaged or disconnected sensor connector
Open/short in sensor signal or ground circuit
Failed pedal pressure/feedback sensor
Corroded pins at connector allowing intermittent contact

Fault status

⚠️ Status

Brake Pedal Feedback Pressure Sensor Circuit — control module detected invalid/open/shorted sensor signal. Code stored when signal is out of expected range or missing.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.0 hours