EVAP Control System Purge Control Solenoid or Purge Control Valve Fault

Error Code P1443 is defined as EVAP Control System Purge Control Solenoid or Purge Control Valve Fault.

This error code is a manufacturer-specific trouble code, meaning it does not apply to all vehicles makes. Rather, it applies only to Ford Escort cars.

Definition

Error Code P1443 is detected when the PCM (powertrain control module, also known as ECM or engine control module in other vehicle makes) has detected that the fuel tank pressure change is greater than a minus 7 inches of H20 in 30 seconds, with purge less than 0.02 lbs. per minute.

Common Symptoms

As with other error codes, this code activates the Check Engine light and registers the code to the vehicle’s memory system. There are no drivability concerns for this code.

Possible Causes

Multiple factors lead to this code, such as:

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  • Defective EVAP Pressure sensor
  • Open or shorted harness in EVAP pressure sensor
  • Poor electrical connection in EVAP pressure sensor
  • Blocked hose between purge valve and FTP sensor
  • Stuck closed EVAP purge valve

How to Check

The sensor at fault is located under the Air Cleaner Assembly, which is at the driver’s side. If this sensor is new, then the next step would be to follow the vacuum lines from the sensor going to the intake. Look for signs of damage, such as cracks, holes, or disconnection.

Next, check the electrical connectors. They shouldn’t be loose, and there shouldn’t be broken pins, wires in the harness, or rubbed through wire possibly grounding out.

If all things above are in good condition, then check for the next step, as it may be a case of outdated PCM. Re-program PCM to fix the code. Ford issued a TSB (technical service bulletin) for this code in the past and recommended the calibration of the PCM. Make sure you double check the vacuum lines first to eliminate obvious faults.

How to Fix

Reprogram the PCM. The revised calibration will re-calibrate the EVAP to test for sufficient flow under normal driving conditions. This fix should reduce the possibility of Check Engine light.

Reprogramming the PCM usually fixes the problem. Thus, it’s best to take your vehicle to a certified technician to have the PCM updated and re-programmed to get rid of the code.