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Home / DTC / U1125 — Yaw rate/G sensor(CAN message)

U1125 — Yaw rate/G sensor(CAN message)

Detailed page for trouble code U1125.

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Code

U1125

MITSUBISHI U — Network/User

Yaw rate/G sensor(CAN message)

Brand: MITSUBISHI
Type: U — Network/User
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Yaw rate / G sensor fault or internal failure
  • Loss of power or ground to the sensor (blown fuse, open circuit)
  • CAN bus wiring fault (open, short to battery/ground, high resistance)
  • Poor or corroded connector at the sensor or intermediate harness
  • CAN bus termination problem or bus wiring short between CAN_H and CAN_L
  • Intermittent module wake/boot or software mismatch between modules

Symptoms

  • ABS, ESC/TC or stability warning lamp illuminated
  • Loss or reduction of stability/traction control functions
  • Possible stored or additional CAN communication trouble codes
  • Reduced vehicle handling assistance during maneuvers (intermittent or continuous)
  • Possible limp-mode behavior where ECU limits torque (vehicle-dependent)

What to check

  • Read all stored/freeze-frame codes from all modules; note occurrence and related U-codes
  • Check battery voltage and ground quality; low voltage can cause CAN faults
  • Visually inspect sensor connector and harness for damage, corrosion, pin push-out or water ingress
  • Verify fuses and power/ground circuits for the yaw/G sensor
  • Use a CAN-capable scan tool to check for the yaw sensor message presence and frequency on the bus
  • Measure CAN_H and CAN_L differential with an oscilloscope or CAN tester; check for expected waveforms

Signal parameters

  • Yaw-rate message expected: periodic CAN message ID specific to manufacturer (check manufacturer data)
  • Message frequency: typically periodic (several Hz to tens of Hz) while ignition on and vehicle awake
  • Yaw rate value range typically spans ± (tens to a few hundred) degrees/sec depending on sensor model
  • Lateral acceleration (G) range typically ±1 to ±3 g depending on sensor
  • CAN bus idle voltages: CAN_H and CAN_L near mid-supply (~2.5 V) with differential signaling when active
  • Message integrity: correct checksum/CRC and expected byte format (manufacturer-specific)

Diagnostic algorithm

  1. Confirm U1125 and note any related codes from ABS/ECU/gateway modules. Record freeze-frame and live data availability.
  2. Verify battery voltage (12 V nominal) and good chassis/engine grounds before further testing.
  3. Inspect sensor connector and wiring for physical damage; repair any obvious issues.
  4. Check sensor power and ground pins for proper voltage/continuity with ignition on.
  5. Using a CAN-capable scan tool, observe whether the yaw/G sensor CAN message is present and at correct frequency. If message is present but values are implausible, suspect sensor calibration/accuracy or data corruption.
  6. If message is absent, use an oscilloscope or CAN tester at the sensor connector to confirm bus activity and waveform quality on CAN_H and CAN_L. Look for noise, missing recessive/dominant transitions, or shorts.
  7. Measure termination resistance across CAN_H and CAN_L (approx. 60 ohms). Repair any open or incorrect termination.
  8. Trace and repair wiring faults (shorts to battery/ground, opens) between the sensor and the nearest network node or ABS module.
  9. If wiring and bus are good, replace the yaw rate/G sensor with a known-good unit and retest. Some replacements require calibration or module coding—perform as required.
  10. Clear codes and perform a road test to confirm repair. If fault returns, expand diagnostics to gateway/ABS/ECU modules and consider manufacturer software updates or module replacement.

Likely causes

  • Open/poor connection at the sensor connector or harness
  • Sensor not transmitting (power/ground or internal sensor failure)
  • CAN bus communication fault (short, open, or missing termination)
  • Control module that receives/forwards sensor message has failed or gone to sleep

Fault status

⚠️ Status
No or invalid CAN message from yaw rate/G sensor — communication or sensor fault detected.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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