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Network / CANModerate⚠️ Professional Recommended

U0140

Lost Communication With Body Control Module

Lost communication with the body control module (BCM).

SeverityModerate
CategoryNetwork / CAN
Est. Repair Cost$300–$1500
Code TypeNetwork
DIY RepairProfessional

⚡ Common Causes

  • ›Faulty BCM
  • ›CAN bus wiring fault
  • ›Blown BCM fuse
  • ›Poor ground connection
  • ›Battery fault

⚠️ Symptoms

  • ›Multiple electrical issues
  • ›Warning lights
  • ›Power windows/locks not working
  • ›Lighting issues

✅ How to Fix — Step by Step

  • Step 1:Check BCM fuses
  • Step 2:Inspect BCM connectors
  • Step 3:Test CAN bus wiring
  • Step 4:Replace BCM

🔧 Diagnostic Tools Required

Using the correct diagnostic tools helps identify the root cause of U0140 before replacing parts unnecessarily. Always confirm the fault using live data and manufacturer-recommended diagnostic procedures.

💡 Pro Tip: BCM replacement usually requires programming — have a dealer or specialist perform this.

Repair Cost Estimate

Full Repair Estimate
$300–$1500
DIY Possible?
PRO
Severity
Moderate

Frequently Asked Questions

What does OBD2 code U0140 mean?+
U0140 stands for Lost Communication With Body Control Module. Lost communication with the body control module (BCM).
What causes code U0140?+
Faulty BCM; CAN bus wiring fault; Blown BCM fuse; Poor ground connection; Battery fault
How do I fix code U0140?+
Check BCM fuses; Inspect BCM connectors; Test CAN bus wiring; Replace BCM
How much does it cost to fix U0140?+
Estimated repair cost for U0140 is $300–$1500.
Is U0140 DIY-friendly?+
U0140 typically requires professional equipment and a qualified mechanic.

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