U0527: Invalid Data from Door Window Motor E
The U0527 code indicates that the master control module (typically the Body Control Module or BCM) has received invalid, corrupt, or unrecognizable data from the door window motor E module via the CAN or LIN communication bus. The designation 'Door Window Motor E' usually corresponds to the right rear passenger window in manufacturer naming conventions (A=driver, B=passenger, C=left rear, D=right rear, E=fifth door/sunroof or additional window depending on vehicle configuration). This network communication fault code is triggered when transmitted data fails to meet expected format, has checksum errors, or the sending module does not respond within the protocol's timeout period.
1. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.
2. Most Common Causes
- Internal failure of the window motor E module (damaged communication circuit)
- Interference or damage to the CAN/LIN bus wiring to the window motor
- High resistance or loose connection at the window module connectors
- Fault in the master control module (BCM) misinterpreting data
- Low voltage or power supply failure to the window module affecting communication
- Corrosion on connector pins in the door harness
- Incomplete or corrupted software update in the affected module
3. Symptoms You Will Notice
- Window E (right rear passenger) may be inoperative or operate intermittently
- Check Engine Light or Body Control Module warning light may illuminate
4. Step-by-Step Diagnosis
Scan for all stored codes and freeze frame data to confirm U0527 and related codes
Inspect wiring and connectors between BCM and window motor E for damage, corrosion, or loose connections
Check power and ground at the window motor module; verify battery voltage is stable
Test CAN/LIN bus communication at the window module using an oscilloscope or scan tool
If wiring and power are OK, suspect a faulty window motor module or BCM; perform module communication tests
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, it is generally safe to drive, but the affected window may not operate. Have it diagnosed soon to prevent potential electrical issues.
How much does it cost to fix?▼
Repair costs typically range from $150 to $600, depending on whether the issue is a simple wiring repair or requires replacing the window motor module or BCM.