U0122: Lost Communication With Vehicle Dynamics Control Module
What Does U0122 Mean?
U0122 is a diagnostic trouble code indicating: Lost Communication With Vehicle Dynamics Control Module. This code relates to the network communication system. It has been reported in NHTSA complaints across 4 different vehicle models.
Common Causes
- 🔍 Sensor or control module malfunction
U0122 Reports by Year
Real Owner Reports
From NHTSA complaint database — actual owner descriptions.
"Driving down highway at highway speed and car shot 52 failure codes. Car lost power and crawled to side of road. Nearly got rear ended multiple times trying to remove vehicle from roadway. Engine permanent codes U0111 U012D U0110 U12A5 U1206 U1205 Anti lock brakes permanent codes U040168 CAN "
— Honda Insight owner, 12/09/2022
"U0122 F-Can malfunction (ecm)(pcm vsa control module unit; internal failure in abs modulator unit Several indicators remain on my dashboard due to this needed repair which includes anti lock brakes possibly not working ; repair is needed for several different types of cars"
— Honda Cr-V owner, 07/11/2022
"ESP control unit software Recall 2016090002 Recall 2017110002 Recall 2020080016 And my car shows there’s cero recall active but is giving me problem showing code: U0121 u1110 U0122 B227d U0423 B227d"
— Mercedes-Benz C-Class owner, 03/05/2025
Source: NHTSA Complaints Database
Most Reported Vehicles for U0122
Based on NHTSA owner complaint data.
| # | Vehicle | Reports |
|---|---|---|
| 1 | HONDA ACCORD | |
| 2 | HONDA CR-V | |
| 3 | HONDA INSIGHT | |
| 4 | MERCEDES-BENZ C-CLASS |
Frequently Asked Questions
What causes communication codes?
Can a bad battery cause network codes?
What To Do Next
Possible Fixes
- 🔧 Have the code scanned with a professional-grade scanner to read freeze frame data
- 🔧 Test the relevant sensor(s) with a multimeter before replacing
- 🔧 Check battery voltage and ground connections; inspect CAN bus wiring
- 🔧 If DIY repair isn't feasible, get a diagnostic from a trusted mechanic ($50-150)
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1
Find your vehicle above
Click your make and model for real owner reports and common causes specific to your vehicle.
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2
Check for recalls
Go to nhtsa.gov/recalls and enter your VIN. Free repairs if covered.
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3
Get a professional diagnosis
A code alone doesn't identify the exact failed part. A diagnostic ($50–$150) pinpoints the root cause.