U0223 Lost Communication with Window Motor B
Diagnostic trouble code U0223 indicates a loss of communication between the engine control module (ECM) or body control module (BCM) and the 'B' door window motor, typically the passenger-side window motor. This fault is reported over the vehicle's communication bus (such as CAN, LIN, or ISO 9141). The loss of signal prevents the main module from receiving position feedback or operational status from the window motor, disabling electronic control of that window. This code is strictly electrical and communication-related, ruling out pure mechanical regulator failures unless they directly affect the motor or its sensor.
1. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.
2. Most Common Causes
- Faulty communication bus (CAN/LIN) to the window motor
- Open or shorted wiring between the BCM and window motor
- Corroded, damaged, or loose connector pins at the window motor
- Failed door window motor B (passenger side) or lack of power to it
- Faulty body control module (BCM)
- Blown fuse or relay supplying power to the window motor circuit
3. Symptoms You Will Notice
- Passenger window does not respond to switch commands
- Window may be stuck in one position or move intermittently
4. Step-by-Step Diagnosis
Scan for related communication codes and check BCM data
Inspect wiring and connectors between BCM and window motor for damage or corrosion
Test power and ground at the window motor connector
Check fuses and relays for the window circuit
Verify communication bus signals (CAN/LIN) at the motor
If all else is good, suspect a faulty window motor or BCM
5. Frequently Asked Questions
Is it safe to drive?▼
Yes, the vehicle is generally safe to drive as this code only affects the passenger window operation. However, the window may not function until repaired.
How much does it cost to fix?▼
Repair costs typically range from $100 to $400, depending on whether the issue is a simple fuse, wiring repair, or replacement of the window motor or BCM.