What Does U0404 Mean?
A control module has detected that data received from the Gear Shift Control Module (GSCM) is invalid, corrupted, or contains implausible values. This affects shift-by-wire or electronic shifter systems.
Safety Warning
May prevent proper gear selection, cause vehicle to be stuck in park, or allow unintended gear changes. Critical safety risk if shifter position is misreported. Do not drive until repaired.
Common Causes
35%
Failing gear shift control module producing invalid data
30%
Electronic shifter position sensor malfunction or misalignment
20%
CAN bus wiring or connector problems in shifter circuit
10%
Power or ground circuit issues at gear shift module
5%
Software calibration mismatch after module replacement
Diagnostic Steps
1
Step 1: Monitor gear shift position data in scan tool, moving shifter through all positions to verify correct reporting
2
Step 2: Inspect shifter assembly and connector for mechanical damage, loose connections, or contamination
3
Step 3: Test shifter position sensor voltage and resistance values per manufacturer specifications
4
Step 4: Verify proper voltage supply and ground at gear shift control module
5
Step 5: Check CAN bus communication integrity between GSCM and TCM/ECM using diagnostic software
Estimated Repair Cost
$200 - $1,500
Parts + labor, varies by vehicle and location
A control module has detected that data received from the Gear Shift Control Module (GSCM) is invalid, corrupted, or contains implausible values. This affects shift-by-wire or electronic shifter systems.
The most common cause of U0404 (Invalid Data Received From Gear Shift Control Module) is: Failing gear shift control module producing invalid data
Typical repair costs for U0404 range from $200 to $1,500, depending on the vehicle, location, and whether you do it yourself or go to a shop.
May prevent proper gear selection, cause vehicle to be stuck in park, or allow unintended gear changes. Critical safety risk if shifter position is misreported. Do not drive until repaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0404 to identify the root cause.
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Quick Info
Category
Network
System
Transmission Shift Control
Difficulty
Type
Generic (SAE)
Recommended Tools
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