Code
C1392
MITSUBISHI
C — Chassis
INCOMP.learn neutral(Straight G)
Views:
UK: 18
EN: 18
RU: 13
AI status
Completed
Completed
100%
Causes
- Incomplete or interrupted neutral (Straight G) learning procedure
- Faulty yaw/gyroscope (G) sensor
- Incorrect or noisy sensor signal at rest
- Poor electrical connection: corroded/loose connector or damaged wiring
- Low battery or voltage instability during learning
- ECU or software fault preventing calibration
Symptoms
- ESC/ABS/traction control warning light illuminated
- Stability control functions disabled or limited
- Diagnostic trouble code C1392 present in ABS/ESC module
- Possible degraded vehicle stability behavior under cornering
- Learning/calibration cannot be completed via scan tool
What to check
- Read and record freeze frame data and full DTC list from ABS/ESC and engine ECUs
- Verify battery state of charge and charging system voltage (ideally >12.5 V during learning)
- Visually inspect yaw/gyro sensor and harness for damage, corrosion, or loose connector
- Check that vehicle is on a level surface and wheels/steering are centered before attempting learn
- Attempt the manufacturer-specified neutral (Straight G) learn using a compatible scan tool and record any errors
- Check for related steering angle sensor or wheel speed sensor codes that could affect learning
Signal parameters
- Yaw/gyro sensor rest output ≈ zero (or specified mV/deg/s per service manual)
- Sensor supply/reference voltage (typically 5 V) and ground present
- Signal noise: minimal jitter at rest (use oscilloscope for waveform)
- CAN/serial message status from ABS/ESC module indicating learning state
- Expected sensor output change with controlled yaw input (when diagnosing dynamically)
Diagnostic algorithm
- Retrieve all stored codes and freeze frame; note any related ABS/ESC codes. 2) Ensure battery is fully charged and charging system operating; if low, charge or place on charger. 3) Perform visual inspection of yaw/gyro sensor, steering angle and wheel speed sensor harnesses and connectors; repair any damage. 4) Clear codes, then follow the exact manufacturer procedure for neutral (Straight G) learning using an approved scan tool (ensure vehicle straight, wheels centered, on level ground, and required speeds/stationary conditions met). 5) If learn fails, monitor yaw sensor raw output at rest with scan tool or oscilloscope; check for correct reference voltage and low noise. 6) If sensor output is out of spec or intermittent, replace the yaw/gyro (G) sensor and repeat learn. 7) If wiring and sensor are good but learning still fails, inspect/replace ABS/ESC ECU or update ECU software per service bulletin. 8) After repair and successful learn, clear codes and perform a road test to confirm stability system operation.
Likely causes
- Yaw/gyro sensor out of spec or failed
- Connector corrosion or loose pins at sensor or ABS/ESC ECU
- Battery voltage below required level during learning
- Learning procedure not executed correctly (vehicle not stationary or straight)
- Intermittent wiring fault causing unstable signal
Fault status
Status
C1392 — Neutral (Straight G) learn incomplete: the ESC/ABS system could not complete or validate the neutral position learning for the yaw/gyroscope sensor; stability control calibration required.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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