U0239Lost Communication With Entrapment Control Module A
- Generic OBD-II code · Network
- How the car detects it
- U0239 means entrapment control module A no longer sends messages. Such a unit watches a power closing panel, a window, sunroof, sliding door or gate, for a trapped object and reverses the motor. In the US, FMVSS 118 sets the reversal limits for windows and roof panels that close without constant switch input; anti-pinch electronics such as Microchip's LIN window lift design or TI's TIDA-01389 sunroof driver detect a jam from motor current or Hall pulses. No manufacturer documents U0239 publicly, so which panel module A protects comes from the maker's documentation. GM's rule applies: status message missing at 9-16 V. U0240 is module B, U053A invalid data from A. Typically one-touch or automatic closing is blocked; no MIL.
- What you may notice
- One-touch or automatic closing does not work
- Window or sunroof needs re-initialisation
- Likely causes
- LikelyModule A without power or ground
- PossibleBus wire broken in door hinge or roof harness
- PossibleWater in the module or plug (door, roof drain)
- RareEntrapment control module A faulty
- Repair
- Medium · Usually a job for a workshop.Typical cost: €40 – €700
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.