Diagnostic Trouble Codes

DiagnosticTrouble.com was developed by experts in automotive service industry to help diagnose cars and assist in troubleshooting procedures.

What is diagnostic trouble code ?

Diagnostics Trouble Codes (DTCs) are codes that the vehicle's electronic control unit generates when it detects malfunction or other issues.

The codes in all these different types are grouped into four categories:

Pxxxx codes relate to powertrain
Bxxxx codes relate to body
Cxxxx codes relate to chassis
Uxxxx codes relate to network or undefined

The OBD 2 Diagnostics trouble process is preformed by your cars onboard computer system using sensors located throughout your car's engine, drive train(p), chassis(c), body(b), and network communication(u) systems. Some fault codes indicate real problems with your vehicle and some indicate faulty sensors, see Cause and Repair Info Below.

How to find diagnostic trouble code ?

Data link connector location is under dashboard on driver side of car.

If data link connector is not located under dashboard, a labe should be there telling where the connector can be found.

Latest Added DTC's

Powertrain Codes	Network Codes	Chassis Codes	Body Codes
P312E Code P1656 Code	U1675 Code U3225 Code	C1251 Code C0145 Code	B0853 Code B3270 Code

Don't Forget (Before & After DTC Check)

Sometimes when a Check Engine Light comes on the vehicle's engine computer will go into a "back-up" or "limp-home" mode. This allows the vehicle to continue operating until repairs can be made. Back-up or limp-home modes are not the most emission or fuel efficient way for the vehicle to operate. The problem needs to be repaired.

The Check Engine Light will stay on until the readiness monitor related to that fault has been reset and the sensor that was recorded out-of-range is seen as within range again.