C1223

Code

MITSUBISHI C — Chassis

Suspension of SNSR.active check

Brand: MITSUBISHI

Type: C — Chassis

Views: UK: 15 EN: 29 RU: 31

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Page language: EN

Causes

Blown fuse or loss of supply to ABS/ESP or sensor circuit
Open, shorted, corroded or disconnected sensor wiring or connector
Faulty sensor (wheel speed, yaw/rate, G-sensor or other related sensor)
Intermittent or low battery/charging system voltage during self-check
Faulty ABS/ESP control module or internal software fault
Bus/communication fault on CAN/LIN preventing sensor data or status reporting

Symptoms

ABS/ESP/brake warning lamp or master warning lamp illuminated
Reduced or disabled traction/stability control function messages
Possible ABS pump/inverter not operating on demand
Stored or multiple related ABS/sensor DTCs present
Vehicle may display degraded braking/stability behavior under slip conditions

What to check

Read and record all stored codes and freeze frame data with a capable scan tool
Check vehicle battery voltage and charging system (key on and engine running)
Inspect fuses and relays for ABS/ESP and sensor circuits
Visual inspection of sensor connectors (wheel speed, yaw, G sensors) for corrosion, bent pins and secure mating
Inspect wiring harness for damage, chafing, repairs or corrosion from each sensor to the ABS/ESP module
Use a scan tool to monitor live sensor data and look for missing or implausible values

Signal parameters

Sensor power/reference: typically an ECU supplied 5 V reference or switched +12 V depending on sensor type — verify with manufacturer data before testing
Passive inductive wheel speed sensor: produces AC pulse; voltage and frequency increase with wheel speed (near 0 V at rest)
Active hall/magnetoresistive wheel speed or yaw sensors: DC pulse or square wave, 0–5 V logic-level pulses referenced to ECU ground
Yaw/G sensors often have a mid-reference voltage (e.g., ~2.5 V) at rest; rate output varies above/below that reference — check manufacturer spec
CAN bus nominal voltages: CAN_H ~2.5–3.5 V, CAN_L ~1.5–1.5 V at idle; communication dropout is a common cause of suspended checks

Diagnostic algorithm

Connect a diagnostic scanner; record C1223 plus any other stored codes and freeze-frame data. Note conditions when code set (key position, vehicle speed, battery voltage).
Check battery and charging: verify battery state and measure voltage with key on (>=12.0 V) and engine running (~13.5–14.5 V). Low voltage can abort self-checks.
Inspect fuses/relays related to ABS/ESP and related sensor power; replace any blown fuses and retest.
Visually inspect sensor connectors (wheel speed, yaw, G sensors) and ABS module connectors for corrosion, water intrusion, bent pins, or loose retainers. Repair as needed.
With scanner, monitor live sensor values while an assistant rotates wheels or performs a short drive to confirm each sensor provides expected pulsed or analog output. Use an oscilloscope for inductive sensors if available.
Measure sensor resistances and reference voltages per manufacturer specs; if sensor readings are out of range, replace sensor.
Perform wiggle test on wiring harness while observing live data and checking for code reappearance to find intermittent wiring faults.
Check CAN bus communication: verify no other modules report bus faults; use a scope or bus analyzer to confirm message traffic. Repair short/open on bus as needed.
Clear codes and perform a road test to see if C1223 returns and under what conditions. If code returns and sensors/tests are good, suspect ABS/ESP control module or software. Consult technical service bulletins and consider module programming or replacement.
After repair, confirm all related ABS/ESP functions and run ECU self-tests; document findings.

Likely causes

Corroded/disconnected sensor connector at wheel or chassis
Damaged wiring harness (pinched, chafed) on sensor supply or signal lines
Failed sensor (open/short or out-of-range signal)
Blown fuse or poor ground for ABS/ESP module
Loss of reference voltage during key-on self-check (battery low)
Intermittent CAN bus fault between sensor module and ABS ECU

Fault status

⚠️ Status

Suspension of sensor active check — the stability/ABS control unit could not complete or detect the sensor self-check; stability/ABS features may be disabled until fault is corrected.

🟡 Repair difficulty: Medium

⏱️ Diagnostic time: 0.5-2.5 hours

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C1223 — Suspension of SNSR.active check