Error Code P1409 is defined as EGR Vacuum Regulator Solenoid Circuit Malfunction. This error code refers to a test to check the electrical function of the EGRVR (Exhaust Gas Recirculation Vacuum Regulator) solenoid. The test fails when the EGRVR circuit voltage is either too high or too low when compared to the expected range of the voltage. For the test to be completed, the EGR must be enabled.

This error code is a manufacturer-specific trouble code, meaning it does not apply to all vehicles makes. Rather, it applies only to specific vehicle makes, such as Ford. Specification on the definition, troubleshooting, and repairs still vary from one make and model to another.


The EGT vacuum regulator solenoid is an electromagnetic device used to regulate the vacuum supply to the EGR valve. This solenoid contains a coil that magnetically controls the position of a disc to control the vacuum. As the duty cycle of the coil increases, the vacuum cycle that passes through the solenoid the EGR valve also increases. The vacuum that is not directed through this valve is vented through the solenoid vent to the atmosphere. Note that at 0% duty cycle (which means no electrical signal applied), the EGR vacuum regulator solenoid will still allow some vacuum to pass, but not enough to open the EGR valve.

Error Code P1409 means a malfunction in the EGR vacuum regulator solenoid circuit, which happens when the circuit voltage is higher or lower than the required voltage.

Common Symptoms

Aside from the activation of the Check Engine light and the registry of the Error Code P1409 into the system, vehicles affected with this error code usually experiences pinging problem, which makes sense for vehicles with EGR valve issue. Other symptoms typically include:

  • Decreased power a
  • Rough idle

Possible Causes

Many factors may cause this error code to arise. Some of the possible causes are:

  • Defective EGRVR solenoid
  • Open or shorted EGR vacuum regulator solenoid harness
  • Poor electrical connection in EGR vacuum regulator solenoid circuit
  • Defective PCM (rare)

How to Check

Diagnosis for this code starts by testing the EVR solenoid for voltage on both wires. This being a ground side switch circuit that with the Key On Engine Off. You should be able to see two 12V feed, one going in, and going out coming out of the solenoid. Take your first of two measurements, which will be the wire to the right connected to a voltmeter positive lead. The negative lead is on the battery.

Next, get the reading to the other wire by moving the pin. If you get volt reading that is lower than the required on either wire, then that means there’s a problem in the EGR.

How to Fix

The code 1409 in most case is set due to a bad EGR control solenoid. Replacing the defective EGR control solenoid will likely correct your concern.

To remove the EGR valve, you should first remove battery ground cable. Then, disconnect the EGR vacuum regulator valve. Next, disconnect the electrical connector, then disconnect the vacuum hoses.