U0122 on Subaru: How to Diagnose & Fix
Lost Communication With Vehicle Dynamics Control Module
1 Subaru model · 1 documented issue · 1 critical
U0122 on Subaru by model: symptoms, diagnosis and fix
The 2024 bulletin provides enhanced EPS self-diagnosis software for C2531, C2532, U0122 and B2811. A 2024 owner reported lost steering assist and a car awaiting rack replacement, not a completed successful repair. Separately, a 2025 owner (ODI 11744713) reports a dealer diagnosis of C2532 and replacement of steering gear 34110FN03A. That is one reported outcome, not a universal fix. Applies to: 2024 Crosstrek with the documented EPS fault codes and a ROM ID covered by bulletin 04-29-23R. Production changes start at VIN R3756650 (Indiana) and RH321601 (Japan). The separate 2025 owner report does not extend that bulletin to 2025 or prove the same cause.
Common Symptoms
- Steering warning lamp
- Reduced power-steering assistance
How to Fix
Have a steering warning or loss of assistance diagnosed promptly. For 2024 vehicles, a Subaru technician checks the stored codes and ROM ID and follows bulletin 04-29-23R reprogramming when eligible; other faults require the service-manual diagnosis. The 2025 owner-reported rack replacement is not evidence that the bulletin applies to 2025 or that every vehicle needs a rack. Replacement requires the diagnosed condition and exact fitment. Normal warranty rules apply; this is not a recall or a promise of free repair.
Sources for this issue (3)
U0122 code reference
General diagnostic-code context. The code alone does not confirm a cause for your vehicle; use the applicable issue card and its sources.
Frequently asked questions
What does U0122 mean on a Subaru?
U0122 stands for "Lost Communication With Vehicle Dynamics Control Module." Sets when a module loses data-bus communication with the Vehicle Dynamics Control Module (stability/VDC/VSA/ESC controller) and no longer receives its expected messages. On Subaru it is documented across 1 model: Crosstrek.
What are the most common causes of U0122?
The most common causes of U0122 are: Open or shorted bus wiring to the vehicle dynamics module, Corroded or loose connector / poor ground, Blown fuse / lost power feed, Low battery voltage, Failed vehicle dynamics control module. The specific cause varies by vehicle.
How much does it cost to fix U0122 on a Subaru?
Repair costs vary widely with the root cause and Subaru model; each issue on this page carries its own estimate where one is published.
Looking for U0122 on a different make?
View U0122 across all makes →Join 600+ people using Au7o to better understand their vehicles.
Content compiled with AI assistance using NHTSA complaints, TSBs, and owner reports. May contain errors. Always verify with your vehicle's service manual.