Invalid Data Received From Door Control Module B
The U0434 code means the vehicle's onboard diagnostic system has detected: Invalid Data Received From Door Control Module B. This is a low severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- moderate
- Estimated cost
- $150 - $500 (parts and labor)
Network codes mean modules are not communicating. You need a scanner that reads all systems to find the problem.
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Common Symptoms
- Passenger door controls inconsistent
- Passenger window operating on its own
- Passenger mirror not adjusting
- Passenger door lock not responding correctly
Probable Causes (Ranked by Likelihood)
- Failed passenger door module Very High
- Door jamb wiring damage High
- CAN bus data corruption Moderate
- Water damage to door module Low
Step-by-Step Diagnostic Procedure
-
Check passenger door jamb wiring
-
Scan door module B for codes
-
Inspect for water damage in door panel
-
Test door module power and ground
Frequently Asked Questions
Can I drive with U0434?
Yes. Door controls may misbehave but the door is still functional.
What causes U0434?
Usually door jamb wiring damage or water intrusion in the passenger door panel.
How much does U0434 cost to fix?
Typically $150 to $500.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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