If your vehicle’s check engine light illuminates, you should use a scan tool to check if it has any logged trouble codes. If the U0402 code has been stored, read this article to find out about the code’s definition, common causes, and common symptoms.
Diagnostic trouble code (DTC) U0402 code stands for Invalid Data Received from TCM. This code is logged when modules on the data network are receiving implausible data from the transmission control module (TCM).
Modern vehicles use a data network that allows vehicle control modules to communicate with each other. These control modules expect to receive a specific type of information from related modules. The devices are programmed to receive a specific type of information. This can be a serious diagnostic trouble code (DTC) because other modules need information from the TCM. This DTC can directly affect safety systems like traction control and stability control.
Note: The definition of the U0402 code can be different depending on the vehicle manufacturer. Consult the appropriate repair manual or repair database for the exact code definition.
The U0402 code can be caused by the following problems:
The P0402 code can cause your vehicle to show the following symptoms:
The U0401 code might be a generic transmission-related code that has a list of common causes, but you should still verify if your vehicle has those issues before you execute repairs.
Diagnosing DTCs typically involves inspecting and testing the concerned components. This task might require a lot of technical knowledge and specialized tools. Additionally, many of the components that can trigger the trouble code are difficult to properly access and inspect. If you don’t think you’re up to the task, then you shouldn’t hesitate to leave the task to a professional mechanic.
When it comes to fixing the U0401 code, it is probably best to let a mechanic do the job. However, if you think your automotive know-how is good enough to do the fix yourself, it will be best to follow the right steps and proper protocols to avoid any further issues down the line. Finding the root cause of the issue is paramount because your course of action will depend on the diagnosis. There is no single solution that will guarantee a fix because repair procedures can vary greatly between different makes and models.
After finding the problem, you can look at reputable internet repair resources and how-to guides like those from Chilton. You may also want to check out an ALLDATA single vehicle subscription to find vehicle-specific repair information.
Any information provided on this Website is for informational purposes only and is not intended to replace consultation with a professional mechanic. The accuracy and timeliness of the information may change from the time of publication.