P1400 - FAULT CODE P1400 - OBD2


P1400 Code failures by brands


Description of DTC code P1400

For the Catalytic Converter or Catalyst can do its job properly, such as reducing emissions efficiently, it needs to be kept at a considerably high temperature. That is why the cold start strategy is used, which significantly reduces the time it takes the catalytic converter to reach the required temperature.

During a cold start, the engine idle speed is high and the spark timing is delayed, thus allowing the catalyst to increase its temperature in a shorter time. For this diagnosis, the engine speed, throttle position, engine airflow, spark advance, engine coolant temperature, engine run time, vehicle speed, and park/neutral position are checked to build an exhaust energy model. The actual model is compared to the expected exhaust energy model.

After a cold start is detected, diagnostics are performed, and if the actual exhaust power model does not match the expected exhaust power model, the PCM (Powertrain Control Module) will set the fault code P1400 OBDII on your Chevrolet vehicle.

Symptoms of fault code P1400

  • The Check Engine lamp is lit.
  • The vehicle loses RPM to the point of attempting to shut down after a cold start.

Causes of OBD2 P1400

The reasons why the P1400 OBD2 diagnostic code is set for the Chevrolet vehicle manufacturer are the following

  • There may be restrictions or blockages in the air intake system.
  • An air filter may be in poor condition.
  • The throttle body or MAF Sensor may have certain degrees of obstructions.
  • The engine may have vacuum leaks.
  • The intake manifold may leak.
  • The vehicle's exhaust system may be defective due to recent modifications or blockages.

Possible solutions of the DTC code P1400

The steps to solve the P1400 OBDII DTC code on your Chevrolet are

  • Check out the TSB.
  • Check if other DTCs are stored in the vehicle's computer memory. Diagnose according to the order shown on the scanner.
  • Perform a thorough check of the air intake system so that it does not present any blockage that prevents the necessary airflow. Repair as needed.
  • Check the air filter as well as the air filter connections for obvious damage. Make any necessary corrections.
  • If your vehicle has an electronic throttle body, it is necessary to uninstall the body and make a complete cleaning of the throttle body and plate.
  • Check the MAF Sensor, duct, and air filter box for restrictions or damage to the crankcase ventilation system.
  • Check that the Catalytic Converter is not obstructed or clogged. Correct if necessary.

Codes related to P1400

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