Code
C1381
MITSUBISHI
C — Chassis
Straight G SNSR.stuck/low gain
Views:
UK: 18
EN: 37
RU: 25
AI status
Completed
Completed
100%
Causes
- Faulty Straight G (longitudinal G) sensor (internal failure)
- Open, shorted or corroded sensor connector or wiring
- Poor or missing sensor power supply or ground
- Intermittent connection (broken wire, poor crimp)
- Controller (ABS/ESP/ASC) input circuit fault
- Sensor misalignment or incorrect mounting
Symptoms
- ABS, traction control or stability indicator lamp illuminated
- Traction/stability control may be disabled or behave unpredictably
- Vehicle may show poor stability control intervention or unexpected braking
- Related drivability or cruise control anomalies in some vehicles
- DTC stored in ABS/ESP/ASC module (C1381)
What to check
- Read and record freeze frame and all stored codes from ABS/ESP and engine modules
- Check for other related DTCs (power, grounds, CAN/communication errors)
- Visually inspect sensor and wiring for damage, corrosion, or loose connectors
- Verify fuses and battery voltage to the control module and sensor circuit
- Using scan tool, view live sensor data at ignition ON and during low-speed acceleration
- Measure reference power and ground at the sensor connector with a DVOM
Signal parameters
- At rest (0 g) sensor output typically near mid-supply (commonly ~2.5 V on a 5 V system) — exact value depends on vehicle
- Output should vary smoothly with longitudinal acceleration; not be fixed
- Expected dynamic change: several hundred mV per g (sensor-specific); full-range typically within 0.1–4.9 V
- No abrupt jumps, dropouts or stuck constant voltage when vehicle accelerates/brakes
- CAN/diagnostic message present and updating (if sensor data is sent over CAN)
Diagnostic algorithm
- Capture freeze frame and note conditions under which C1381 was set. Check for other stored codes.
- Clear code, then attempt to re-run the fault by cycling ignition and performing a short drive or known acceleration. See if code returns.
- Visually inspect sensor mounting, connector and wiring harness for damage, contamination or corrosion. Repair any obvious faults.
- With key ON (engine off) and using a scan tool, monitor Straight G sensor output. At rest the value should be near mid-scale; when accelerating or pulling the vehicle, output should change. If output is constant or shows very low variation, proceed.
- Verify sensor supply and ground at the connector with a DVOM: check reference voltage (often 5 V or vehicle-specific), ground continuity to chassis, and signal line voltage. Repair any missing power/ground.
- Back-probe the signal and observe with a scope if available. Look for noise, stuck DC level, intermittent dropouts or low amplitude.
- Perform wiggle test on harness while monitoring live data to find intermittent wiring faults.
- If wiring and power/ground are good but signal is stuck/low, replace the Straight G sensor with a known-good unit or follow manufacturer replacement procedure.
- After sensor replacement, perform any required zero/offset calibration or sensor alignment with a dealer-level scan tool per service procedure.
- Clear codes and confirm proper operation with a test drive. Verify no recurrence and that stability/traction systems operate normally.
Likely causes
- Damaged / water-intruded sensor connector or corroded pins
- Sensor internal failure (stuck output or reduced sensitivity)
- Broken or shorted signal/ground wire between sensor and control module
- Missing reference power or ground to the sensor
- Module needs sensor rezero / calibration after replacement or repair
Fault status
Status
ABS/ESP control module reports Straight G (longitudinal acceleration) sensor stuck or exhibiting low gain — sensor output is not changing as expected or has insufficient signal amplitude. This can disable or degrade vehicle stability/traction functions.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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