Code
C0131
OPEL
C — Chassis
Pressure Sensor Circuit Malfunction
Views:
UK: 8
EN: 12
RU: 6
AI status
Completed
Completed
100%
Causes
- Open or short in sensor wiring
- Corroded, bent or disconnected sensor connector
- Failed pressure sensor
- Poor ground or missing reference voltage (sensor supply)
- Intermittent connection (water ingress, damaged insulation)
- Blown fuse or relay supplying sensor circuit
Symptoms
- ABS, ESP or brake warning lamp illuminated
- Reduced or disabled ABS/traction control function
- Possible changes in braking feel under ABS operation (pulsing or reduced function)
- Stored DTC and possible driveability/traction restrictions depending on system logic
What to check
- Read all ABS/ESP and related codes with a capable scan tool; record freeze frame and related codes
- Perform a visual inspection of the sensor and wiring harness for damage, corrosion or loose connectors
- Check fuses and relays for the ABS/pressure sensor supply
- Back-probe sensor connector to measure reference voltage, signal and ground with ignition on
- Wiggle harness while monitoring signal to look for intermittent faults
- Compare live sensor output to expected values while applying system pressure (if safe and serviceable)
Signal parameters
- Typical sensor supply (reference) voltage: ~5 V (verify exact value in OEM manual)
- Typical sensor output: ~0.5–4.5 V proportional to pressure (varies by sensor)
- Short to ground: ~0 V output; short to battery: ~reference or above expected range
- Open circuit: no sensor output / infinite resistance on signal conductor
Diagnostic algorithm
- Connect a diagnostic scan tool, read and record C0131 and any other related codes; note freeze-frame data.
- Visually inspect sensor, connector and harness for damage, moisture or corrosion; repair obvious issues.
- Verify fuses/relays for ABS/pressure sensor circuit; restore if blown and retest.
- With ignition ON, back-probe connector: confirm reference voltage present, good ground, and signal wire shows plausible resting voltage. If reference or ground missing, trace wiring to fuse/ECU.
- Wiggle harness/connectors while monitoring live data to find intermittent faults.
- If voltages present but signal out of range, measure sensor resistance (if service data available) or apply known pressure and observe signal change. If sensor does not respond correctly, replace sensor.
- If wiring and sensor test good, suspect control module fault; check for software updates and consult wiring diagrams before replacing the module.
- After repair, clear codes and perform a road or system test to verify the fault does not return.
Likely causes
- Damaged harness at wheel well or steering column where wiring flexes
- Corroded connector at the sensor (road salt/moisture)
- Sensor diaphragm or electronics failed after impact or contamination
- 5V reference or ground lost due to blown fuse or poor chassis ground
- Recent work (brakes, suspension) disturbed connector or wiring
Fault status
Status
Code C0131 stored when the chassis control module detects an abnormal or missing pressure sensor signal (open, short, out-of-range or intermittent). The module may disable associated ABS/ESP functions until the fault is resolved.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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