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DTC codes / U01xx · Lost communication with a control module / U014E

U014ELost Communication With Multi-axis Acceleration Sensor Module B

U014E is a generic network communication code indicating that a control module on the vehicle's Controller Area Network (CAN) bus has lost contact with the multi-axis acceleration sensor module B. The computer detects this when the sensor module stops sending its periodic CAN messages or fails to acknowledge requests within the expected time window.

SystemNetwork
Code typeGeneric (all makes)
SeverityMedium
Fix difficultyIntermediate
AreaLost communication with a control module

Symptoms you may notice

  • The warning light (often the stability control or traction control light) illuminates on the dashboard.
  • Often no symptoms besides the warning light, especially if the sensor is only used for non-critical functions.
  • The stability control or traction control system may be disabled, reducing traction in slippery conditions.
  • The hill start assist or hill descent control may not function.
  • The anti-lock braking system (ABS) may be disabled if the sensor is shared with that system.
  • In some vehicles, the transmission may enter limp mode or shift harshly if the sensor feeds into the powertrain network.

Common causes, most likely first

  1. A faulty multi-axis acceleration sensor module B (internal failure).
  2. Damaged or corroded wiring or connectors at the sensor module or along the CAN bus.
  3. A blown fuse or poor power/ground connection to the sensor module.
  4. Water intrusion or physical damage to the sensor module or its harness.
  5. A malfunctioning CAN bus transceiver inside the sensor module.
  6. A separate module on the same CAN bus failing and disrupting communication (less common).
  7. Software or calibration issue in the sensor module requiring a reflash or relearn (rare).

How to diagnose and fix it

  1. Verify the code with a scan tool and check for other communication codes that might indicate a broader bus fault.
  2. Inspect the sensor module's wiring harness and connectors for damage, corrosion, or loose pins.
  3. Check the fuse and ground connections serving the multi-axis acceleration sensor module B.
  4. Measure CAN bus voltage and resistance at the sensor module connector to confirm bus integrity.
  5. If wiring and power are good, substitute a known-good sensor module or perform a continuity test on the CAN lines.
  6. Clear the code and perform a road test to see if it returns; if it does, replace the sensor module and relearn it if required.
  7. After repair, verify that all related systems (stability control, ABS) are operational and no other codes are present.

When the sensor is not the real culprit

  • A loose or corroded ground connection at the sensor module can mimic a failed sensor, so always check grounds before condemning the part.
  • The multi-axis acceleration sensor module B is often shared with the stability control system, so a code may set even if the sensor's primary function appears to work.
  • CAN bus communication codes can be caused by a different module on the same bus that is shorting or sending garbage data, so check for other U-codes.
  • Some vehicles require a calibration or relearn procedure after replacing the sensor module, and skipping it will cause the code to return.
  • Water leaks into the cabin or trunk can damage the sensor module or its connectors, especially if it is mounted low or under carpet.

Can I keep driving with U014E?

You can usually drive the vehicle with this code, but the stability control and traction control systems may be disabled, reducing safety in slippery conditions. Avoid aggressive driving or towing until the fault is repaired, and have the system checked promptly.

Tools that help

Tools we recommend are in the Auto Veteran shop on Amazon. As an Amazon Associate we earn from qualifying purchases.

Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.

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