What is DTC?

Administrator posted this 30 May 2018

If "Check Engine Light" is on, it means that your vehicle has one or more issues explained in a form OBD II Diagnostic Trouble Codes (DTC). The "Malfunction Indicator Lamp" (or MIL ) comes on to warn you when the On-board Diagnostic System (OBD II) detects an issue that could cause your vehicle's emissions to exceed 1.5 times the legal limit.
If a component of a system is not operating normally within acceptable limits or fails a self-test, the OBD II system records one or more "Diagnostic Trouble Codes" (DTCs) that correspond to the fault and turns on your Check Engine Light to let you know there is a problem.

OBD-II supports SAE J2012 standard which comprises the corresponding trouble codes - Diagnostic trouble codes (DTC’s). The OBD-II codes have united format consisting of a Latin letter and 4 digits (sometimes letters instead).
These codes are used by some manufacturers to identify vehicle problems.

The codes are divided into two groups – generic and extended codes. Generic ones are strictly standardized and their decoding is always the same for all the OBD-II cars, but vehicle manufacturers also may use manufacturer specific DTC codes that are different from the Generic codes – extended codes. Foreign vehicles may also use DTC codes different from the generic DTC codes. It's important to remember that codes depend on the cars construction, model, and manufacturer.

InCarDoc can help you with car diagnostics and reset Trouble Codes in few minutes. Just download iOS or Android application and check your car now.