Code
C1383
MITSUBISHI
C — Chassis
Straight G SNSR.high voltage
Views:
UK: 16
EN: 21
RU: 20
AI status
Completed
Completed
100%
Causes
- Short to battery voltage on the Straight G sensor signal or power supply
- Open or poor ground connection in sensor circuit
- Corroded, disconnected or damaged sensor connector or wiring harness
- Failed Straight G sensor (internal short or internal electronics fault)
- Water intrusion or contamination of sensor/connector
- Faulty ABS/ESP control module (less common)
Symptoms
- ABS, ESC, or traction control warning lamp illuminated
- Vehicle stability functions reduced or disabled
- Possible stored or active limp-home mode for stability systems
- Noisy or intermittent stability/traction control operation
- Diagnostic trouble code C1383 present on scan tool
What to check
- Visually inspect sensor and wiring harness for damage, chafing, corrosion, or melting
- Scan ECU for C1383 and any related codes; record freeze-frame data
- Backprobe the sensor connector and measure reference voltage, signal voltage and ground with ignition ON
- Check for continuity between sensor ground and chassis ground
- Check for short to battery: measure resistance between signal/power wires and battery + with harness disconnected
- Wiggle the wiring and connector while observing live data or voltages for intermittent faults
Signal parameters
- Sensor reference supply (Vref): typically ~5 V (verify exact value for vehicle)
- Normal sensor output range: roughly 0.5 V to 4.5 V depending on orientation; nominal/rest ~2.0–3.0 V (model-dependent)
- High-voltage fault threshold: sensor signal above expected upper limit (often >4.5 V)
- Check continuity: low resistance between sensor ground and chassis ground; open or very high resistance indicates ground fault
Diagnostic algorithm
- Safety: Park on level ground, key OFF, apply parking brake. Use manufacturer procedures for working around SRS/ABS systems.
- Connect a scan tool, read and record C1383 and any related codes and freeze-frame data. Clear codes and see if C1383 returns.
- Perform visual inspection of Straight G sensor, mounting, and wiring harness for damage or contamination.
- With ignition ON (engine OFF), backprobe the sensor connector. Measure Vref, signal voltage, and ground. Compare to expected values.
- If signal voltage is high, disconnect the sensor and measure voltage on the harness signal wire. If harness still shows high voltage, inspect for short to battery or power feed on harness.
- Check for short to +12V by measuring resistance between signal/power wires and battery + with harness disconnected. Repair shorted wiring as required.
- If harness voltages are correct with sensor disconnected, test/replace the Straight G sensor and retest.
- If replacing sensor does not clear fault and harness checks are good, consider inspecting/repairing the ABS/ESP control module connector and ground. Module replacement is last resort after confirming wiring and sensor.
- After repairs, clear codes and perform road test or replication procedure to confirm the fault does not return.
Likely causes
- Wiring shorted to +12V at connector or along harness to sensor
- Loose/corroded ground at sensor or chassis ground point
- Damaged insulation allowing contact with battery power or ignition feed
- Internal sensor failure producing an abnormally high output voltage
- Connector pins bent, pushed out, or contaminated causing intermittent high reading
Fault status
Status
C1383 — Straight G sensor: high voltage detected on sensor circuit (signal exceeds expected range).
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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