EVAP Vent Valve

Replace the EVAP system vent valve, which controls the venting of the charcoal canister to atmosphere during fuel system purge operations.

Warnings

Tools required

Parts

• EVAP vent valve × 1 — Mopar 04891632AA or equivalent

Preparation

1. Park vehicle on level surface and engage parking brake.
2. Disconnect negative battery terminal using 10mm socket.
3. If raising vehicle, lift driver side rear and support with jack stands rated for vehicle weight.
4. Allow exhaust system to cool completely if vehicle has been running.

Procedure

1. 1

   Access the EVAP vent valve area
   Locate the EVAP vent valve, which is mounted on or near the charcoal canister assembly. Consult the factory service manual for the exact canister/vent valve location on the 2008 Viper, then position yourself for access using a shop light to identify the valve with electrical connector and vapor hoses attached. Use shop light to locate the valve assembly with electrical connector and vapor hoses attached.
2. 2

   Disconnect electrical connector
   Locate the electrical connector on the EVAP vent valve. Press the release tab on the connector and pull straight back to disconnect. If connector is difficult to access, use needle nose pliers to depress the tab while pulling the connector free.
3. 3

   Disconnect vapor hoses
   Identify the vapor hoses connected to the vent valve inlet and outlet ports. Depress the quick-connect tabs on each hose fitting and pull the hoses straight off the valve ports. Note the orientation of each hose connection for reinstallation. Some fuel vapor may be present in the lines.
4. 4

   Remove vent valve mounting fasteners
   Remove the EVAP vent valve mounting fasteners or release the retaining clips securing the valve to its bracket or the canister assembly. Verify the exact fastener type, count, and size against the factory service manual before proceeding. Support the valve while removing the second fastener to prevent it from falling.
5. 5

   Remove vent valve
   Carefully pull the vent valve away from the mounting location. Inspect the mounting area and vapor hose ports for damage, debris, or signs of vapor leakage.
6. 6

   Prepare new vent valve
   Remove the new EVAP vent valve from packaging and verify it matches the original part in connector type, hose port configuration, and mounting hole locations. Check that any protective caps on the vapor ports are removed before installation.
7. 7

   Install new vent valve
   Position the new vent valve in the mounting location with the electrical connector oriented toward the wiring harness. Align the mounting holes with the bracket or canister assembly. Install the 2 mounting bolts and tighten by hand initially.
8. 8

   Tighten mounting fasteners
   Tighten the mounting fasteners securely, or ensure retaining clips are fully engaged, per the factory service manual specification. Tighten firmly but do not over-torque, as the valve body may be plastic or composite material. Ensure the valve is secure and does not move when pulled.
9. 9

   Reconnect vapor hoses
   Push each vapor hose onto its corresponding port on the vent valve until the quick-connect fitting clicks into place. Pull gently on each hose to verify it is fully seated and locked. Ensure hoses are routed without kinks or sharp bends.
10. 10

    Reconnect electrical connector
    Align the electrical connector with the vent valve terminal and push firmly until the locking tab clicks into place. Tug gently on the connector to confirm it is fully seated and locked.
11. 11

    Reconnect battery and clear codes
    Reconnect the negative battery terminal and tighten securely with 10mm socket. If a scan tool is available, clear any stored EVAP system diagnostic trouble codes. The PCM will need to run a complete drive cycle to verify proper EVAP system operation.

Reassembly

1. Lower vehicle if raised and remove jack stands.
2. Verify all tools and parts have been removed from under vehicle.
3. Double-check that all vapor hose connections and electrical connector are fully seated.

Verification

• Start the engine and verify no unusual sounds or check engine light illumination.
• Allow vehicle to idle for 2-3 minutes and check the vent valve area for any fuel vapor odors indicating a leak.
• If a scan tool is available, monitor EVAP vent valve command status to confirm the PCM can control the valve.
• Perform a complete drive cycle including cold start, city driving, and highway cruise to allow the EVAP monitor to run and verify system integrity.

Related trouble codes on this vehicle

Codes that commonly send this job to the bay — tap one for symptoms, causes, and diagnostic steps.

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