Code
C1292
HUMMER
C — Chassis
Brake Fluid Pressure Sensor Circuit
Views:
UK: 14
EN: 23
RU: 15
AI status
Completed
Completed
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Causes
- Open or shorted wiring between sensor and ABS/ESC module
- Corroded, loose, or damaged sensor connector
- Failed brake fluid pressure sensor (internal fault)
- Poor or missing ground or reference voltage to sensor
- Low brake fluid level or air in brake lines causing abnormal sensor reading
- Water ingress or contamination at connector
Symptoms
- ABS warning lamp and/or traction control/ESC lamp illuminated
- Possible reduced ABS/traction function or disabled ABS
- Brake pedal may feel unchanged or firmer/softer depending on condition
- Stored/active DTCs related to brake pressure or ABS system
- Possible diagnostic trouble codes in multiple ABS-related channels
What to check
- Read all ABS/ESC codes and freeze-frame data with a scan tool; note related codes
- Visually inspect sensor wiring and connector for damage, corrosion, or loose pins
- Check brake fluid level and condition; top up to correct level if low
- Backprobe sensor connector and verify reference voltage, ground, and signal with key on
- Wiggle test harness while monitoring live data to find intermittent faults
- Check for continuity and shorts to battery/ground between sensor and module
Signal parameters
- Sensor typically uses a 5 V reference and ground from ABS/ESC module (reference ≈ 4.5–5.5 V).
- Signal is generally an analog voltage proportional to pressure (varies 0–5 V depending on design); signal voltage should change smoothly with applied brake pressure.
- Resistance or millivolt output depends on sensor type — consult vehicle service manual for exact values.
- No signal, a steady out-of-range voltage, or a noisy/intermittent waveform indicates a fault.
Diagnostic algorithm
- Retrieve and record ABS/ESC codes and freeze-frame data. Note when the fault occurred and any associated codes.
- Perform a visual inspection of sensor, harness, and connector at the brake pressure sensor location. Repair any obvious damage.
- Verify brake fluid level and inspect master cylinder and lines for leaks or recent work that may have introduced air.
- Backprobe the sensor connector with the ignition ON (engine off) and measure: reference voltage, ground continuity, and sensor signal voltage. Compare to service specifications if available.
- With a scan tool, monitor live brake pressure sensor data while an assistant applies the brake pedal (or apply pressure with a diagnostic pressure tool). Confirm signal changes smoothly and corresponds to pedal pressure.
- If reference voltage or ground missing, trace wiring to the ABS/ESC module and repair shorts/opens. Check associated fuses and module grounds.
- If wiring and power/ground are good but signal is out-of-range or non-responsive, replace the brake fluid pressure sensor following manufacturer procedure.
- After repairs, clear codes, perform required bleed procedure if sensor or hydraulic components were opened, and road-test to verify the fault does not return and ABS/ESC lamps remain off.
- If fault persists after sensor and wiring verified, consider ABS/ESC module diagnostic and consult manufacturer service information for module testing/reprogramming.
Likely causes
- Wiring harness damage or connector corrosion (most common)
- Faulty pressure sensor
- Low brake fluid level or air in system affecting sensor reading
- Intermittent connection at sensor harness
- Less likely: internal ABS module driver fault
Fault status
Status
Brake Fluid Pressure Sensor Circuit — open/short/out-of-range or intermittent. ABS/Traction control may be disabled until repair.
Repair difficulty: Medium
Diagnostic time: 1.0-2.0 hours
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