P0445 - EVAPORATIVE EMISSION (EVAP) CANISTER PURGE VALVE - SHORT CIRCUIT

POST UPDATED IN September, 2020

Description of DTC code P0445 Generic

Diagnostic code P0445 OBDII means that the Powertrain Control Module (PCM) has found a malfunction in the Evaporative Emission Control System (EVAP) bleed valve control circuit.

The function of EVAP is to retain fuel vapors so that they do not escape into the atmosphere. Once the vapors are captured by the EVAP, they are sent through a carbon canister, through vacuum lines to the engine, where they are subsequently burned. It should be noted that these vapors do not enter the EVAP system during idling. It is only when the demand for fuel is high or when the EVAP system vapor pressure is above the set limit.

There is a sensor in the Evaporative Emission Control System that is also called EVAP, which converts system pressure changes into signal voltages which are sent to the PCM to indicate that fuel adjustments should be made to ensure the optimum air/fuel mixture at all times.

When there are changes in exhaust gas composition, some varying signal voltages are transmitted to the PCM, which are used by the PCM to reduce the fuel vapor flow or close the bleed valve to maintain or restore the air/fuel ratio as needed.

Symptoms of fault code P0445 Generic

  • Check Engine light on.
  • Decreases fuel economy.
  • You smell a strong odor of fuel.
  • Instability in acceleration.
  • The engine is running roughly.

Causes of OBD2 P0445 Generic

The reasons for storing DTC code P0445 OBD2 are

  • There may be connectors or cables in bad condition.
  • System-related circuits may be shorted.
  • The bleed valve may be stuck in the open position.

Possible solutions of the DTC code P0445 Generic

When faced with the fault code P0445 OBDII, you must take into account the following for its correction

  • Consult the manual for the location, routing, and function of the cables related to the bleed valve. Then, check all wiring and make sure it is in good working order. Repair as necessary.
  • Check input voltage, continuity, ground, and resistance on all associated cables. You must disconnect the PCM's bleed valve to avoid damage to the controller. The resistance values of the wires must match the values in the specifications. Repair them if you find any inconsistencies.
  • Check the operation of the bleed valve. Consult the manual for the correct input voltage. Test the internal resistance, if it is not within specification, change the valve.
  • Check the control solenoid and make sure the resistance of the solenoid is within specifications. Connect the negative cable of the DVOM to the ground and the positive cable to one of the terminals of the solenoid. There should be a high resistance as a result. If not, the solenoid is shorted to ground, replace it.

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