Lost Communication With Digital Rearview Mirror Module
The U0242 code means the vehicle's onboard diagnostic system has detected: Lost Communication With Digital Rearview Mirror Module. This is a low severity code.
- Keep driving?
- Yes, but fix soon
- DIY difficulty
- easy
- Estimated cost
- $200 - $800 (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
- Digital rearview mirror showing static or blank
- Cannot switch between digital and regular mirror
- Mirror display flickering
- Rear camera feed not showing in mirror
Probable Causes (Ranked by Likelihood)
- Failed digital mirror module Very High
- Rear camera connection loose High
- CAN bus communication error Moderate
- Mirror display failure Low
Step-by-Step Diagnostic Procedure
-
Check rear camera connection
-
Toggle between digital and manual mirror mode
-
Scan mirror module for codes
-
Inspect mirror wiring harness
Frequently Asked Questions
Can I drive with U0242?
Yes. Switch to the standard mirror mode. The physical mirror still works.
What causes U0242?
Usually a failed digital mirror module or loose rear camera connection.
How much does U0242 cost to fix?
Typically $200 to $800.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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