Window Motor Feedback Signal Loss
This diagnostic trouble code (DTC) sets when the door control module (DDM or PDM) does not receive the expected feedback signal from the window lift motor. The system relies on this signal, typically generated by a Hall effect sensor built into the motor, to monitor glass speed and position. This feedback is critical for automatic express up/down operation and the anti-pinch safety feature. Without it, the module cannot precisely control window travel, often disabling automatic functions and safety systems.
1. Commonly Affected Makes
2. Most Common Causes
- Failed window lift motor with internal Hall effect sensor
- Open circuit, short to ground, or short to voltage in the wiring between the door module and regulator motor
- Corroded, damaged, or loose pins at the window motor connector
- Internal failure of the door control module (DDM or PDM)
- Mechanically obstructed or damaged window regulator causing erratic feedback signal
3. Symptoms You Will Notice
- Window does not operate or operates only manually (no express up/down)
- Anti-pinch feature disabled or window reverses unexpectedly
4. Step-by-Step Diagnosis
Scan for related DTCs in the door module and check for communication faults.
Inspect the window motor connector for corrosion, damage, or loose pins.
Test the Hall effect sensor signal wire for proper voltage and pulsing using a multimeter or oscilloscope while operating the window.
Check the wiring harness between the door module and motor for opens or shorts.
If wiring and motor test good, suspect a faulty door control module.
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, the vehicle remains drivable, but the affected window may lose automatic and safety functions. Repair is recommended to restore full operation.
How much does it cost to fix?▼
Repair costs typically range from $150 to $400, depending on whether the motor, regulator, or module needs replacement and labor rates.