U0122Network Communication

Lost Communication With Vehicle Dynamics Control Module

U0122 means a module has lost communication with the vehicle dynamics control module over the CAN bus. Stability control functions are disabled. It usually points to a wiring, power, ground, or connector fault.

🚗 Not recommended. Losing the vehicle dynamics module disables stability and traction control.

HIGH

severity

🎯 Top Causes, Ranked by Likelihood

#1Wiring, connector, or CAN bus fault$50-$500

45%

Damaged or corroded wiring to the dynamics module.

#2Power or ground fault$50-$400

30%

Blown fuse or poor ground at the module.

#3Failed vehicle dynamics module$400-$1400

15%

The module itself has failed.

🩺 Common Symptoms

Stability control warning
Traction control disabled
ABS warning light
Warning lights
Other U-codes stored

💰 Repair Cost: DIY vs Shop

DIY Cost

$50-$400

Shop Cost

$150-$1200

📋 Free OBD2 Code Cheat Sheet

The 50 most common codes with likely cause and DIY fix cost. Sent once, no spam.

🔧 How to Diagnose U0122

1Check fuses, power, and grounds for the dynamics module

2Inspect CAN wiring and connectors at the module

3Scan all modules for lost-communication patterns

4Back-probe the CAN bus for correct signal

❓ Frequently Asked Questions

Can I drive with U0122?

Not safely. Stability and traction control are disabled. Diagnose it before driving in poor conditions.

What causes U0122?

Wiring, connector, or power/ground faults at the vehicle dynamics module, most often.

Is U0122 related to ABS?

Yes, vehicle dynamics and ABS work together. This code often appears alongside U0121.

🔗 Related Codes

U0100U0121U0128U0155