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OBDII/EOBD diagnostics trouble codes definition

If your car supports OBD II or EOBD, then you can already use almost 5000 generic OBDII codes. These codes are from PowerTrain series (P0XXX, P2XXX, P34XX), Body Series (B0XXX), Chassis series (C0XXX), Network series (U0XXX, U2XXX, U3XXX).

Also there is a list of more than 13500 additional manufacturer specific codes.

Supported manufacturers with specific OBD2 codes:


Enter code:
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P
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Definition of check engine code P1821:

Citroen/Peugeot

Transmission Transfer Case Clockwise Shift Relay Coil Open Circuit

Ford

Transmission Transfer Case Clockwise Shift Relay Coil Open Circuit

GM

Internal Mode Switch Mode "B" Circuit Low
If you can not find the error description, please let us know and we will try to help: