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Home / DTC / U014E — Lost Communication With Multi-axis Acceleration Sensor Module B

U014E — Lost Communication With Multi-axis Acceleration Sensor Module B

Detailed page for trouble code U014E.

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Code

U014E

Generic U — Network/User

Lost Communication With Multi-axis Acceleration Sensor Module B

Brand: Generic
Type: U — Network/User
Views: UK: 18 EN: 26 RU: 14
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Page language: EN

Causes

  • Faulty or unplugged Multi-axis Acceleration Sensor Module B
  • Power supply or ground fault to the sensor module (blown fuse, open circuit, poor ground)
  • Damaged, shorted or disconnected wiring or connectors between the module and vehicle network
  • CAN/LIN network fault (open/shorted/low speed bus failure, missing termination)
  • Another module on the network is isolating/bus-off and preventing communication
  • Software/version mismatch or corrupted module firmware

Symptoms

  • Malfunction indicator lamp (MIL) or dedicated ABS/ESC warning lamps illuminated
  • Stability control/traction control reduced or disabled
  • Event data or IMU data not visible on a scan tool / diagnostic tool
  • Related systems (airbag, advanced driver assistance) may show faults or be limited
  • Intermittent or persistent loss of system functions that depend on vehicle acceleration data

What to check

  • Read all network modules with a capable scan tool; note additional U-codes or 'bus off' statuses
  • Check battery voltage and inspect charging system; ensure stable supply (9–16 V) to modules
  • Verify fuses and fusible links related to the sensor and associated control modules
  • Visually inspect the sensor connector and wiring harness for damage, corrosion, or moisture
  • Backprobe power and ground pins at the sensor connector while key ON to confirm supply and ground
  • Check CAN bus voltages at the sensor connector (CAN H / CAN L) with ignition ON

Signal parameters

  • Module supply voltage: nominal battery voltage with key ON (approx. 9–16 V) — verify within range
  • Ground reference:
  • CAN bus idle voltage: approx. 2.5 V on CAN H and CAN L when recessive
  • CAN bus dominant state: CAN H ~3.5 V, CAN L ~1.5 V when active (values vary by manufacturer)
  • Termination resistance (measured across CAN H and CAN L): approx. 60 ohms total (two 120Ω terminators in parallel)
  • Expected network message rate: module should respond to health/ID messages; absence = communication loss

Diagnostic algorithm

  1. Connect a quality scan tool and confirm U014E and any related codes; record freeze frame and events.
  2. Check for other U-codes or bus-off faults that indicate a wider network failure. If multiple modules lost, focus on common bus wiring or power source.
  3. Visually inspect harness, connectors and module for damage, water ingress or corrosion. Repair any obvious issues.
  4. With ignition ON (engine off), backprobe module power and ground pins; confirm correct supply voltage and a good chassis ground.
  5. Measure CAN H and CAN L voltages at the module connector and compare to expected idle and dominant levels. If voltages abnormal, isolate wiring to locate short/open.
  6. Check termination resistance across CAN H/L at two points on the bus to verify proper termination (~60 Ω).
  7. If network voltages and wiring check good, clear codes and attempt to re-identify the module with the scan tool. Attempt to command or request data from the module.
  8. If intermittent, perform wiggle tests and road-test while monitoring live data/messages to reproduce loss of communication.
  9. If all wiring, power/ground and bus integrity are confirmed and the module does not respond, verify software/calibration level and perform reflash/update if available before replacing the module.
  10. If replacement is required, follow manufacturer procedures for module coding/initialization and recheck the network for faults after installation.

Likely causes

  • Bad connector, pin corrosion or physical damage at the sensor harness
  • Module lost power or ground (blown fuse, open circuit on supply or ground)
  • CAN bus wiring fault (short to battery/ground, open circuit, or missing termination)
  • Failed sensor module
  • Network interference or another module in bus-off state

Fault status

⚠️ Status
Lost Communication With Multi-axis Acceleration Sensor Module B — module not responding on vehicle communication bus (timeout/no response).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.5-3.0 hours

Similar codes

U0140 U0121 U0155 U0073 U0100
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