U0226: Lost Communication With Door Window Motor E

What it means

A control module has stopped receiving expected messages from door window motor E. The code identifies the communication loss; it does not establish the cause or which window functions are affected.

At a glance

• Usually lights the warning light of the system that lost communication

How it works

Door window motor E operates a power window and may send status or control information to other modules over the vehicle network. U0226 occurs when the reporting module misses expected messages from motor E; it does not specify whether the cause lies in the motor, its supply, or its network connection.

Common causes

Most likely first.

1. Loss of power or ground to the motor
2. Open, shorted, or damaged network wiring or connector
3. Failed motor or control module

Symptoms

• Window operation may be unavailable or limited
• A communication fault may be stored; a warning may appear depending on the vehicle

How to diagnose it

1. Scan the vehicle's modules and review freeze-frame data for low voltage or communication faults related to motor E.
2. Test the window controlled by motor E from the available switches and note whether it is unresponsive, intermittent, or limited.
3. Inspect motor E's connector and the wiring through the door for corrosion, loose pins, moisture, or flex-related damage.
4. Check motor E's power and ground, then test its network wiring for opens or shorts against the vehicle wiring information.
5. If the circuit is intact, test motor E and its communication using the manufacturer's diagnostic procedure.

Common fixes

• Charge the battery if low voltage contributed to the fault.
• Clean and secure a poor motor E connector.
• Repair damaged wiring or restore power or ground to motor E.
• Correct a confirmed network wiring fault on the motor E path.
• Replace motor E or its control component if testing confirms it is defective.

Can I keep driving?

You can generally drive if the window is securely closed or positioned safely, but do not assume it will operate during the trip. A window stuck open can compromise visibility, weather protection, and vehicle security.