Invalid Data Received From Variable Displacement Module
The U0484 code means the vehicle's onboard diagnostic system has detected: Invalid Data Received From Variable Displacement Module. This is a low severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $300 - $1,500 (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
- Engine running on all cylinders constantly
- Cylinder deactivation not working
- Fuel economy worse than expected
- Check engine light on
Probable Causes (Ranked by Likelihood)
- VDM sending bad data Very High
- Lifter deactivation solenoid failure High
- CAN bus error Moderate
- Oil pressure issue affecting VDM Low
Step-by-Step Diagnostic Procedure
-
Check engine oil level and condition
-
Scan VDM module for codes
-
Test deactivation solenoids
-
Verify oil pressure
Frequently Asked Questions
Can I drive with U0484?
Yes, short distances. The engine runs on all cylinders but uses more fuel.
What causes U0484?
Usually a lifter deactivation solenoid failure. GM AFM/DFM lifter issues are common.
How much to fix?
Between $300 and $1,500.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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