Lost Communication With Body Control Module D
Your engine's main computer lost its connection to the body control module, which handles lights, locks, and windows—like two walkie-talkies that can't hear each other anymore. This communication breakdown prevents the modules from sharing data needed to run certain vehicle functions.
The ECM continuously monitors CAN bus communication signals to the Body Control Module (BCM) at specific intervals. It checks for valid message receipt and response within defined timeouts. If expected frames are missing or delayed beyond threshold, a communication fault is triggered.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| CAN Bus Message Timeout | Messages received every 10-100ms | No response for >500ms |
| CAN Signal Integrity | Valid frames with correct checksums | Corrupted or missing frame data |
Code U0144 is a moderate fault. You can generally drive to a workshop, but avoid long trips or high-load driving (motorway, uphill towing) until it is diagnosed. If the code keeps returning after clearing, or if you notice the symptoms listed above worsening, do not delay professional diagnosis. Many moderate codes have multiple possible root causes — a mechanic with live OBD data can identify the exact fault more efficiently than part-by-part trial and error.
Once the fault is repaired, U0144 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.