Replace the EVAP purge valve (canister purge solenoid) on a 2014 Ram 2500 with 6.7L Cummins Diesel engine to restore proper evaporative emissions control.

Warnings

Tools required

Parts

• EVAP Purge Valve/Canister Purge Solenoid × 1 — Use OEM specification - Mopar 4891577AA or equivalent
• Vacuum line retaining clips (if damaged) × 2 — Use OEM specification

Preparation

1. Park vehicle on level ground and engage parking brake
2. Turn ignition to OFF position and remove key
3. Allow engine to cool if recently operated
4. Open hood and secure with prop rod

Procedure

1. 1

   Locate the EVAP purge valve
   The EVAP purge valve is mounted on a bracket on the driver side of the engine compartment, near the firewall and above the transmission. It is a cylindrical solenoid valve with two vacuum lines and one electrical connector.
2. 2

   Disconnect the electrical connector
   Press the release tab on the electrical connector and pull straight off the purge valve. Do not pull on the wires themselves. If the connector is difficult to remove, gently wiggle it while applying steady pressure.
3. 3

   Disconnect the vacuum lines
   Using needle-nose pliers or your fingers, squeeze and slide the retaining clips away from the purge valve on both vacuum line connections. Pull the vacuum lines straight off the valve nipples. Note the orientation of each line for proper reinstallation.
4. 4

   Remove the mounting bracket bolt
   Using a 10mm socket, remove the bolt securing the purge valve mounting bracket to the firewall or engine compartment bracket. Support the valve as you remove the final fastener.
   Torque spec

   Mounting Bolts37 Nm (27 lb-ft)
5. 5

   Remove the purge valve
   Lift the purge valve and bracket assembly out of the engine compartment. If the valve is mounted separately from the bracket, note the orientation for installation of the new valve.
6. 6

   Install the new purge valve
   Position the new purge valve in the same orientation as the old valve. If replacing the valve only, transfer the mounting bracket to the new valve. Ensure the electrical connector port and vacuum nipples face the correct direction for easy connection.
7. 7

   Install the mounting bracket bolt
   Install the mounting bracket bolt and tighten to 37 Nm (27 lb-ft) using a torque wrench. Ensure the valve is positioned correctly and the bracket sits flush against the mounting surface.
   Torque spec

   Mounting Bolts37 Nm (27 lb-ft)
8. 8

   Reconnect the vacuum lines
   Push the vacuum lines firmly onto the purge valve nipples until they seat completely. Install the retaining clips by sliding them over the connection point. Tug gently on each line to verify secure connection. Ensure lines are not kinked or stretched.
9. 9

   Reconnect the electrical connector
   Align the electrical connector with the purge valve terminal and push firmly until you hear or feel a click. Tug gently on the connector to verify it is locked in place.

Reassembly

1. Verify all vacuum lines are properly routed and not kinked or touching hot engine components
2. Ensure electrical connector is fully seated and locked
3. Double-check that mounting hardware is torqued to specification

Verification

• Start the engine and listen for any abnormal vacuum leaks or hissing sounds near the purge valve
• Allow engine to reach operating temperature and verify no check engine light illuminates
• Use a scan tool to verify no EVAP system diagnostic trouble codes are present
• Perform an EVAP system monitor drive cycle if available with scan tool to confirm proper purge valve operation
• Monitor for codes P0441, P0443, P0455, or P0456 which may indicate purge valve issues

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