What Does U0122 Mean?
Communication has been lost between the vehicle's main control module and the Vehicle Dynamics Control Module. This module manages electronic stability control, traction control, and advanced handling systems.
Safety Warning
Electronic stability control and traction control systems will be disabled. Vehicle handling will be unpredictable in emergency situations, wet roads, or adverse conditions, significantly increasing rollover and loss-of-control risk.
Common Causes
35%
Failed Vehicle Dynamics Control Module with internal circuit or software malfunction
30%
CAN bus network wiring damage, open circuits, or short circuits in communication lines
20%
Connector corrosion or damage at Vehicle Dynamics Control Module
10%
Power or ground circuit failure to Vehicle Dynamics Control Module
5%
Gateway module failure preventing communication routing between network buses
Diagnostic Steps
1
Step 1: Verify power and ground to Vehicle Dynamics Control Module; check fuses and measure voltage at module connector
2
Step 2: Inspect module connector for corrosion, moisture, or physical damage; ensure proper connection and terminal integrity
3
Step 3: Use scan tool to attempt communication directly with Vehicle Dynamics Control Module to determine if module responds
4
Step 4: Monitor CAN bus signals at module connector with oscilloscope or multimeter; verify proper signal voltage levels
5
Step 5: Check CAN bus termination resistance and test for shorts to voltage or ground throughout the communication network
Estimated Repair Cost
$200 - $2,000
Parts + labor, varies by vehicle and location
Communication has been lost between the vehicle's main control module and the Vehicle Dynamics Control Module. This module manages electronic stability control, traction control, and advanced handling systems.
The most common cause of U0122 (Lost Communication With Vehicle Dynamics Control Module) is: Failed Vehicle Dynamics Control Module with internal circuit or software malfunction
Typical repair costs for U0122 range from $200 to $2,000, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Electronic stability control and traction control systems will be disabled. Vehicle handling will be unpredictable in emergency situations, wet roads, or adverse conditions, significantly increasing rollover and loss-of-control risk.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to U0122 to identify the root cause.
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Quick Info
Category
Network
System
Vehicle Dynamics / Stability Control System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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