U0199
NetworkModule Communicationmoderate severityLost Communication with Door Control Module A
What U0199 Means
Cannot communicate with door control module A (usually driver door).
Symptoms
- Power windows not working
- Door locks inoperative from that door
- Mirror control not working
Common Causes
- Module failure
- Wiring in door jamb broken
- Water damage in door
- Connector issue
Diagnostic Steps
- Inspect door jamb wiring
- Check for water in door
- Test module power
- Check connector
Where to start: Inspect door jamb wiring harness - flexing breaks wires over time.
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