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OBDII/EOBD diagnostics trouble codes definition

If your car is equipped with OBD-II or EOBD, you can access over 5,000 generic OBD-II diagnostic trouble codes (DTCs). These codes cover various vehicle systems, including Powertrain (P0XXX, P2XXX, P34XX), Body (B0XXX), Chassis (C0XXX), and Network/Communication (U0XXX, U2XXX, U3XXX). Additionally, there are more than 13,500 manufacturer-specific OBD-II codes available for diagnosing issues unique to different car brands and models. Make sure you're equipped with the right tools to understand and resolve these trouble codes to keep your vehicle running smoothly.

By using these OBD-II codes, you can effectively diagnose issues related to engine performance, safety features, suspension, and more.

Supported manufacturers with specific OBD2 codes:

Enter code:
+
P
-
+
0
-
+
0
-
+
0
-
+
0
-


Definition of check engine code P1820:

Citroen/Peugeot:

Transmission Transfer Case Clockwise Shift Relay Coil Circuit Failure

Ford:

Transmission Transfer Case Clockwise Shift Relay Coil Circuit Failure

GM:

Internal Mode Switch Circuit A Low

Lincoln:

Transmission Transfer Case Clockwise Shift Relay Coil Circuit Failure

Mercury:

Transmission Transfer Case Clockwise Shift Relay Coil Circuit Failure

Oldsmobile:

Transmission Transfer Case Clockwise Shift Relay Coil Circuit Failure

Toyota:

NIN Sensor Circuit Malfunction

Volkswagen/Audi:

Pressure Contr. Solenoid 2 Short to B +

Volvo:

Pressure Contr. Solenoid 2 Short to B +
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