B011C

Code

Generic B — Body

Fluid Reservoir Level Sensor A

Brand: Generic

Type: B — Body

Views: UK: 31 EN: 34 RU: 25

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Low or empty fluid in the reservoir
Faulty/failed level sensor (float, resistive element or PCB)
Open or shorted wiring between sensor and control module (short to ground or battery)
Corroded, loose or contaminated connector at the sensor
Fluid contamination causing sensor malfunction (electrolytes, debris)
Faulty body control module / input circuit (rare)

Confirm exact freeze frame and any additional body module codes using a scan tool
Visually inspect the reservoir: fluid level, contamination, debris, cracks or leaks
Inspect sensor connector for corrosion, bent pins, water ingress, or poor seating
Check fuses and relays for the body control module circuits if used
Wiggle harness near sensor while monitoring signal to reveal intermittent wiring faults
If available, consult wiring diagram to identify sensor power (typically 5V reference), ground, and signal circuits

Typical sensor type: resistive/float or simple switch; control module expects either a 0–5.0 V signal or open/closed contact
Reference supply to sensor: ~5 V (must be present with ignition ON)
Expected signal voltage (variable sensor): empty ≈ 0–0.5 V; full ≈ 4.0–5.0 V (manufacturer dependent)
Switch-type sensor: open = high impedance/open circuit; closed ≈ 0–5 Ω to ground (or signal pulled to ground)
Resistance-type sensor (example ranges): empty ≈ 8–10 kΩ, full ≈ 0–1 kΩ (values vary by design)
Signal circuit short to battery: >4.8–5.5 V; short to ground: ≈ 0 V; open circuit: OL / infinite resistance

Connect a scan tool and confirm B011C is present; note any related DTCs and freeze frame data
Before probing, ensure reservoir fluid is at correct level and identify sensor location. If coolant or pressurized system, allow to cool and take safety precautions
Visually inspect sensor, reservoir and connector for damage, corrosion, fluid intrusion or loose mounting. Repair or reseat connector if needed then re-scan
With ignition ON (engine OFF), backprobe the sensor connector and verify reference voltage (≈5 V) at the supply pin. If missing, trace to fuse/BCM
Check sensor ground continuity to chassis ground (
Measure signal voltage on the signal pin while moving the float (or filling/emptying reservoir). Verify voltage changes smoothly and matches expected range in Signal Parameters
If signal does not change, measure sensor resistance (disconnect sensor). Compare to expected resistance values or look for open/short. Replace sensor if out of specification
Perform a wiggle test on harness while observing signal/scan tool for intermittent changes. Repair broken wires or damaged wiring harness
If wiring and sensor check good but code persists, verify input circuit at body control module (voltage at module pin with connector connected). If module wiring is correct but input not interpreted, consult OEM service info for BCM tests or consider module fault
After repairs, clear codes and perform functional test / road test. Confirm code does not return and level indication functions correctly