Code
B0131
Generic
B — Body
A/V Sensor Washer Fluid C Control Circuit
Views:
UK: 27
EN: 29
RU: 26
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring in the washer fluid sensor C circuit
- Corroded, loose or damaged connector at the sensor or module
- Failed washer fluid level/pressure sensor C
- Poor ground or power supply to the sensor
- Water intrusion or contamination of connector or sensor
- Faulty body control module (BCM) or related module
Symptoms
- Washer fluid level warning lamp or message may illuminate
- Washer fluid level reading incorrect or unavailable for the sensor labeled C
- Possible inability of the system to operate associated functions that depend on fluid-level input
- Related body system warnings or multiple body sensor DTCs if power/ground is shared
What to check
- Read DTCs and freeze frame data with a scan tool; confirm B0131 is active or stored
- Inspect sensor C connector and wiring harness for corrosion, pin damage, melting or signs of water entry
- Check for aftermarket modifications near wiring harness that could have damaged wires
- Verify related fuses and relays for the washer fluid circuit (if applicable)
- Backprobe the sensor connector and check for proper reference voltage, ground and signal with key on (refer to service manual for expected values)
- Wiggle test wiring while monitoring signal to reproduce intermittent faults
Signal parameters
- Reference voltage present at sensor: typically a regulated 3–5 V reference or vehicle battery voltage depending on design (consult service manual)
- Signal output: varies with sensor type — open/closed switch, resistance change, or voltage signal; should change when sensor or float is moved
- Continuity: wiring between sensor and module should show continuity with ignition off (no open circuit)
- Resistance to ground/power: no short to battery or ground; measured values depend on vehicle design
Diagnostic algorithm
- Retrieve and record DTCs and freeze frame data. Confirm code B0131 and whether other related DTCs are present.
- Visually inspect the washer fluid sensor C, harness and connector for corrosion, loose pins, damage or water intrusion. Repair or replace damaged connectors/wiring as needed.
- With connector disconnected, check sensor actuator/switch for proper mechanical operation (move float or actuator) and measure resistance/voltage change at the sensor terminals per service manual.
- Backprobe the sensor connector at the harness with the ignition on. Verify reference voltage, signal and ground are within expected ranges. Note any intermittent behavior while wiggling harness.
- If the sensor wiring shows open or short, trace and repair the affected wire(s). Use continuity and resistance checks from the sensor connector to the BCM connector.
- If wiring and connectors are good but sensor does not respond correctly when stimulated, replace the washer fluid sensor C and retest.
- If new sensor behaves the same and wiring is confirmed good, test or scan the body control module for faults. Repair or replace module per manufacturer procedures if module is faulty.
- Clear codes, operate the washer/vehicle through required test conditions, and verify the fault does not return.
Likely causes
- Broken or chafed wire between sensor C and the BCM
- Corroded connector pins at the washer fluid sensor or module
- Failed washer fluid level sensor C element
- Intermittent contact from water intrusion or debris
Fault status
Status
Washer fluid sensor C control circuit malfunction detected. Check sensor, wiring and module.
Repair difficulty: Medium
Diagnostic time: 0.5 - 1.5 hours
Similar codes
Repair manuals
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Code
B0131
HUMMER
B — Body
Right Heater Discharge Temperature Fault
Views:
UK: 23
EN: 32
RU: 20
AI status
Completed
Completed
100%
Causes
- Open or shorted wiring in the washer fluid sensor C circuit
- Corroded, loose or damaged connector at the sensor or module
- Failed washer fluid level/pressure sensor C
- Poor ground or power supply to the sensor
- Water intrusion or contamination of connector or sensor
- Faulty body control module (BCM) or related module
Symptoms
- Washer fluid level warning lamp or message may illuminate
- Washer fluid level reading incorrect or unavailable for the sensor labeled C
- Possible inability of the system to operate associated functions that depend on fluid-level input
- Related body system warnings or multiple body sensor DTCs if power/ground is shared
What to check
- Read DTCs and freeze frame data with a scan tool; confirm B0131 is active or stored
- Inspect sensor C connector and wiring harness for corrosion, pin damage, melting or signs of water entry
- Check for aftermarket modifications near wiring harness that could have damaged wires
- Verify related fuses and relays for the washer fluid circuit (if applicable)
- Backprobe the sensor connector and check for proper reference voltage, ground and signal with key on (refer to service manual for expected values)
- Wiggle test wiring while monitoring signal to reproduce intermittent faults
Signal parameters
- Reference voltage present at sensor: typically a regulated 3–5 V reference or vehicle battery voltage depending on design (consult service manual)
- Signal output: varies with sensor type — open/closed switch, resistance change, or voltage signal; should change when sensor or float is moved
- Continuity: wiring between sensor and module should show continuity with ignition off (no open circuit)
- Resistance to ground/power: no short to battery or ground; measured values depend on vehicle design
Diagnostic algorithm
- Retrieve and record DTCs and freeze frame data. Confirm code B0131 and whether other related DTCs are present.
- Visually inspect the washer fluid sensor C, harness and connector for corrosion, loose pins, damage or water intrusion. Repair or replace damaged connectors/wiring as needed.
- With connector disconnected, check sensor actuator/switch for proper mechanical operation (move float or actuator) and measure resistance/voltage change at the sensor terminals per service manual.
- Backprobe the sensor connector at the harness with the ignition on. Verify reference voltage, signal and ground are within expected ranges. Note any intermittent behavior while wiggling harness.
- If the sensor wiring shows open or short, trace and repair the affected wire(s). Use continuity and resistance checks from the sensor connector to the BCM connector.
- If wiring and connectors are good but sensor does not respond correctly when stimulated, replace the washer fluid sensor C and retest.
- If new sensor behaves the same and wiring is confirmed good, test or scan the body control module for faults. Repair or replace module per manufacturer procedures if module is faulty.
- Clear codes, operate the washer/vehicle through required test conditions, and verify the fault does not return.
Likely causes
- Broken or chafed wire between sensor C and the BCM
- Corroded connector pins at the washer fluid sensor or module
- Failed washer fluid level sensor C element
- Intermittent contact from water intrusion or debris
Fault status
Status
Washer fluid sensor C control circuit malfunction detected. Check sensor, wiring and module.
Repair difficulty: Medium
Diagnostic time: 0.5 - 1.5 hours
Similar codes
Repair manuals
Manual library for HUMMER
138
Browse 138 HUMMER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
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