U0144 Code: Lost Communication With Body Control Module "D" (BCM-D) – Symptoms, Causes & Fix

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Fault Code Description

The U0144 is a generic OBD-II DTC (Diagnostic Trouble Code) that indicates one or more control modules have lost communication with the Body Control Module D (BCM-D) via the Controller Area Network (CAN) bus. This fault is part of the U Code family of communication-related diagnostic trouble codes. When the BCM-D cannot communicate with other modules, several body electrical systems may malfunction or become completely inoperative.

Symptoms

  • Check Engine Light or body system warning illuminated.
  • Power door locks fail to operate.
  • Power windows work intermittently or stop functioning.
  • Interior or exterior lighting problems.
  • Remote keyless entry or alarm system malfunction.
  • Body electrical accessories become unavailable.
  • Additional CAN communication DTCs stored.

Common Causes

  • Open or short circuit in CAN High or CAN Low wiring.
  • Blown fuse supplying the BCM-D.
  • Poor battery voltage or charging system issues.
  • Loose, damaged, or corroded electrical connectors.
  • Faulty Body Control Module D (BCM-D).
  • Incorrect module programming after replacement.

Severity

Severity: Moderate to High. While the engine is usually unaffected, several body electrical systems may stop working, reducing convenience and possibly affecting vehicle safety depending on the failed functions.

Average Repair Cost

  • CAN bus wiring repair: $100–$350
  • Power or ground circuit repair: $80–$250
  • Connector repair or replacement: $50–$200
  • Fuse replacement: $10–$50
  • BCM-D programming: $100–$300
  • Body Control Module D replacement: $300–$1,000+

Diagnosis

  1. Scan all modules using a professional OBD-II scan tool.
  2. Inspect BCM-D related fuses.
  3. Verify battery voltage and charging system operation.
  4. Check power and ground circuits.
  5. Inspect CAN High and CAN Low wiring.
  6. Check connectors for corrosion, loose terminals, or water damage.
  7. Confirm BCM-D communication before replacing the module.

Common Repairs

  • Repair damaged CAN bus wiring.
  • Replace blown fuses.
  • Repair faulty power or ground circuits.
  • Clean or replace damaged connectors.
  • Reprogram the BCM-D.
  • Replace the Body Control Module D if confirmed faulty.

Can You Drive With U0144?

Yes. The vehicle will usually remain drivable, but several body electrical functions may not operate correctly. Prompt diagnosis is recommended to prevent additional communication-related issues.

FAQ

Can a weak battery trigger U0144?

Yes. Low battery voltage or unstable charging system voltage can interrupt CAN bus communication and trigger this code.

Will clearing the code permanently fix U0144?

No. The code will usually return unless the underlying communication or electrical fault is repaired.

Does the BCM-D require programming after replacement?

Yes. Most replacement Body Control Modules require programming or configuration using manufacturer-approved diagnostic equipment.

Conclusion

At OBD Spark, we recommend checking the battery, fuses, power supply, ground circuits, and CAN bus wiring before replacing the Body Control Module D. Many U0144 OBD-II DTC cases are resolved by repairing wiring or connector faults rather than replacing the control module.

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