Semi-Truck Power Window and Door Control Module Faults | UpFix

Why Won’t My Power Windows or Door Locks Work?

In semi-trucks, window and door controls are often managed by a dedicated electronic module. When that module fails, switches become unresponsive or only work intermittently. Moisture, wiring corrosion, or failed relays are usually the cause.

Typical Symptoms

• Power windows don’t move or move slowly

• Locks only work on one door

• Intermittent switch operation

• No response from mirror adjustment or heaters

Repair vs Replacement

New door modules can be costly and require coding to your truck’s network. UpFix repairs your original unit by replacing failed relays and restoring communication with the BCM.

Repair Process

1. Inspect for corrosion or water damage

2. Replace damaged relays and drivers

3. Test all switch and motor outputs

4. Confirm full door control operation before return

Supported Brands

Freightliner, Volvo, Peterbilt, Kenworth, International and others.

Get your truck back on the road and keep your costs low.
Send your part to UpFix for professional testing and repair.
We’ll restore it to like-new condition, save you up to 80% compared to buying new, and make it plug-and-play ready when returned.