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Home / DTC / U0125 — Lost Communication With Multi-axis Acceleration Sensor Module A

U0125 — Lost Communication With Multi-axis Acceleration Sensor Module A

Detailed page for trouble code U0125.

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Code

U0125

Generic U — Network/User

Lost Communication With Multi-axis Acceleration Sensor Module A

Brand: Generic
Type: U — Network/User
Views: UK: 16 EN: 38 RU: 51
AI status
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Page language: EN

Causes

  • Open or shorted wiring on sensor module data lines (CAN or LIN)
  • Faulty multi-axis acceleration sensor module (internal failure)
  • Loose, corroded, or disconnected connector at sensor module or gateway module
  • Blown fuse, poor power or ground to the sensor module
  • CAN/LIN bus wiring fault (short to battery/ground, high resistance)
  • Controller area network (CAN) bus off state or excessive errors

Symptoms

  • Stability control, traction control, or airbag warnings illuminated
  • Vehicle stability functions disabled or limited
  • Stored or active U0125 and possibly other network communication codes
  • Loss of sensor data for X/Y/Z acceleration on scan tool
  • Intermittent or permanent warning lights related to chassis or restraint systems

What to check

  • Scan tool: read all stored/active codes and freeze frame data from all modules
  • Verify battery voltage is within normal range and check main fuses
  • Check for the sensor module on the network (module present/alive)
  • Visually inspect sensor connector and wiring for corrosion, bent pins, damage, or water ingress
  • Wiggle test harness while monitoring live data for intermittent communication
  • Check module power and ground circuits for proper voltage and continuity

Signal parameters

  • Module alive status / presence on network (yes/no)
  • CAN message ID(s) from Multi-axis Acceleration Sensor Module A
  • Message frequency (expected Hz) and whether messages are present
  • Multi-axis acceleration outputs (X, Y, Z) — values or 'no data' if lost
  • CAN bus error counter or 'bus off' status reported by nodes
  • Supply voltage to module (VBAT) and sensor reference voltage (if applicable)

Diagnostic algorithm

  1. Retrieve and record all DTCs and freeze-frame data from all modules. Note when code first occurred and any other network codes.
  2. Reproduce condition if possible. Clear codes, operate vehicle to see if U0125 returns and under what conditions (key cycles, vibration, temperature).
  3. Verify battery voltage and main power/fuse to the sensor module. Replace blown fuses before further diagnosis.
  4. With ignition on, use a scan tool to check if the Multi-axis Acceleration Sensor Module A is present on the network and if it is transmitting data. Note message frequency and data values.
  5. Visually inspect the sensor module connector and harness for corrosion, bent pins, water intrusion, or physical damage. Repair or replace damaged connectors/wiring.
  6. Perform wiggle test of wiring while monitoring live data/messages. If communication interrupts with movement, isolate and repair wiring/harness.
  7. Measure supply and ground at the sensor connector. Confirm proper VBAT and ground continuity. Repair poor power/ground as required.
  8. Probe CAN (or LIN) bus lines near the sensor with a multimeter/oscilloscope. Verify idle voltages (~2.5 V on each CAN line) and presence of valid message waveforms. Look for shorts to battery/ground or excessive noise.
  9. If bus is silent at the sensor but present at gateway/ECM, trace wiring between nodes, checking splice points and connectors. Repair any opens/shorts.
  10. If wiring and bus are good but the sensor module does not respond, check for required software updates or configuration. If confirmed faulty, replace the multi-axis acceleration sensor module and program/configure as required.
  11. After repair, clear codes and perform functional test/road test to confirm the code does not return and that related systems operate normally.

Likely causes

  • Connector or harness damage at the sensor module
  • Sensor module lost power or ground
  • CAN bus wiring fault between sensor and gateway/ECM
  • Failed multi-axis acceleration sensor module

Fault status

⚠️ Status
Lost Communication With Multi-axis Acceleration Sensor Module A — periodic messages from the sensor module were not received by the network controller. Affected systems that rely on acceleration data may be limited.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.5 hours

Similar codes

U0100 U0121 U0126 U0155 U0073
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