P1200 - FAULT CODE P1200 - OBD2

POST UPDATED IN May, 2021

P1200 Code failures by brands

P1200 BUICK, CADILLAC, CHEVROLET, GMC: FUEL INJECTOR CIRCUIT

Description of DTC code P1200

Fuel injectors are essential components of the fuel delivery system. They deliver the fuel at the most appropriate time and ensure clean and efficient combustion. The design of the injectors includes an atomizer, which makes gasoline or diesel fuel is evenly distributed for optimum combustion. They are used to replace the carburetor system because they contribute to efficient engine operation and considerably reduce emissions.

The injectors control the volume of fuel entering the combustion chamber, ensuring that the correct amount is injected at the right time. The ECM (Engine Control Module) determines when the injection should occur. When it activates the injector, pressurized fuel is sprayed into the fuel chamber through the injectors.

When the DTC P1200 OBDII code is set, it is due to the ECM detects an incorrect voltage level in one or more fuel injector circuits for more than 5 seconds while the engine is running.

Symptoms of fault code P1200

  • Check Engine light on.
  • Ignition problems.
  • General engine malfunctions.
  • Delays after pressing the accelerator pedal.
  • Unexpected engine stoppage.

Causes of OBD2 P1200

The P1200 OBD2 fault code is set for one or more of the following reasons:

  • There may be damage to the fuel injector circuit wiring.
  • The injector circuit may be shorted.
  • A fuel injector is possibly broken.

Possible solutions of the DTC code P1200

To troubleshoot the P1200 OBDII diagnostic code, consider this:

  • Consult the Technical Service Bulletins.
  • Check with an automotive scanner to see if other DTCs are set that indicate faults with a specific injector or cylinder. If so, diagnose those codes.
  • Check wires, connectors, and other components of the fuel injector electrical circuit for common failures. Repair if necessary.

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