Error code

OBD2 U0140

OBD2U0140
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Lost Communication With Body Control Module.

Severity

highCan drive but may experience issues with vehicle functions controlled by BCM.

Summary

U0140 indicates lost communication with the Body Control Module (BCM) on the CAN bus system. The BCM controls various vehicle functions like power locks and windows, lighting, and infotainment.

Symptoms

  • Warning light may illuminate

Common Causes

  • Damaged or disconnected wiring in the CAN bus system
  • Corroded connectors in the CAN bus system
  • Defective control modules
  • Failed switches, sensors, actuators, or locking mechanisms

Diagnosis

  1. Check for damaged wiring and connectors in the CAN bus system
  2. Inspect control modules, switches, sensors, actuators, and locking mechanisms

Fixes

  • Repair or replace faulty wiring/connectors
  • Replace defective control module(s)

FAQ

Is it safe to drive with U0140?

It is generally drivable but may experience issues with vehicle functions controlled by the BCM.

How do I diagnose U0140?

Diagnosing this code often requires checking wiring, connectors, and control modules across multiple systems. Professional diagnosis is recommended due to complexity.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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