Most TecDoc installations include a backup file named tecdoc.config.default or config.bak.
Note: You may need to re-enter your license key and database connection details after this step.
In isolated cases, the Windows user profile has broken permissions. Create a new local Windows administrator account, log into it, and try launching TecDoc. If it works, your original user profile has corrupted registry permissions for the AppData folder. Migrate your data to a new profile. loading data failed check the configuration file tecdoc new
If the above fails, you may need to manually correct the configuration. Below is a skeleton of a valid TecDoc (New) JSON configuration – compare it with your file.
"tecdocSettings":
"database":
"server": "localhost",
"port": 5432,
"name": "TecDoc_Core",
"username": "tecdoc_user",
"password": "your_encrypted_password"
,
"apiEndpoints":
"partsLookup": "https://api.tecdoc.net/v5/articles",
"vinDecode": "https://api.tecdoc.net/v5/vin/decode",
"vehicleTree": "https://api.tecdoc.net/v5/vehicles"
,
"cache":
"path": "C:\\ProgramData\\TecDoc\\Cache\\",
"maxSizeMB": 2048
,
"language": "en_US",
"licenseKey": "XXXXX-XXXXX-XXXXX-XXXXX"
Critical checks:
Last year, a medium-sized truck repair shop in Ohio contacted me with this exact error. They had been using TecDOC New for two years without issue. Then, one Monday morning, every terminal showed “Loading Data Failed. Check the Configuration File.”
The owner had already reinstalled the software twice. I arrived on-site and skipped the obvious steps. Most TecDoc installations include a backup file named
The actual cause: Their IT contractor had pushed a group policy update over the weekend that changed all AppData folders to “Read Only” as a security measure. TecDOC New could not write its session token to the config file. The software tried to load, found the file locked, and failed.
The fix: The IT contractor excluded the TecDOC folder from the Read-Only policy. The error vanished instantly. Note: You may need to re-enter your license
The moral: Always check recent system changes. Did Windows update? Did IT push a new policy? Did you install new security software? These are the silent killers of automotive software.