OBD2 Error Codes
Codes are shown in OBD2 format. The first letter means system group:
Browse brand OBD2 diagnostic hubs or connect a USB scan tool.
Code descriptions are currently maintained mainly in Azerbaijani; interface labels appear in your selected language.
Frequently asked questions
What are OBD2 error codes?
OBD2 codes are standardized diagnostic trouble codes (P, B, C, U families) reported by the engine or other ECUs when a fault is detected.
How do I find brand-specific codes on Kareta?
Open the OBD2 hub, choose your car brand, or use the USB OBD scan tool. Brand pages list codes with symptoms and first checks.
Does reading codes replace a workshop inspection?
No. Codes are starting points for diagnosis. A qualified workshop should confirm causes before major repairs.
What do P, B, C, and U mean in OBD codes?
P = powertrain, B = body, C = chassis, U = network/communication. The next digits identify the system and fault.
Can I use the USB OBD scanner from a phone?
USB Web Serial works on supported desktop browsers. Many phones need Bluetooth adapters; see the OBD scan page for device support.