Lost Communication With Body Control Module E
Your engine computer lost its connection to the body control module, like a walkie-talkie losing radio signal. This prevents them from communicating about critical vehicle functions.
The ECM monitors CAN bus communication signals from the body control module E at regular intervals. It expects valid messages within a specific timeframe; if messages are absent or corrupted for too long, a communication fault is detected.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| CAN Bus Message Timeout | Valid message received every 10-100ms | No valid message for >500-1000ms |
| Signal Integrity | Valid CAN checksum and voltage levels | Corrupted data or voltage outside 0-5V |
Code U0145 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, U0145 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.