What Does U0240 Mean?
The secondary entrapment control module has lost communication on the vehicle network. This module monitors power window, sunroof, or liftgate anti-pinch sensors to prevent passenger injury during operation.
Common Causes
35%
Failed entrapment control module B
30%
Damaged wiring or corroded connector to module B
20%
CAN bus communication circuit fault
10%
Power supply or ground circuit failure
5%
Module software corruption or programming error
Diagnostic Steps
1
Step 1: Verify power and ground at entrapment control module B connector
2
Step 2: Inspect connector for corrosion, pushed-out pins, or moisture damage
3
Step 3: Test CAN High and CAN Low signals at module location for proper voltage
4
Step 4: Check if primary entrapment module A is communicating to isolate network vs module fault
5
Step 5: Reprogram or replace module B if circuits test correctly
Estimated Repair Cost
$250 - $1,200
Parts + labor, varies by vehicle and location
The secondary entrapment control module has lost communication on the vehicle network. This module monitors power window, sunroof, or liftgate anti-pinch sensors to prevent passenger injury during operation.
The most common cause of U0240 (Lost Communication With Entrapment Control Module "B") is: Failed entrapment control module B
Typical repair costs for U0240 range from $250 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Anti-pinch protection for certain windows or sunroof may be disabled, creating potential injury risk especially to children. Exercise caution when operating affected components.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0240 to identify the root cause.
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Quick Info
Category
Network
System
Power Window / Sunroof Anti-Pinch System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
