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1. Remove the fuel tank. 2. Disconnect the evaporative emission (EVAP) line (3) from the canister.3. Reposition the EVAP canister hose clamp. 4. Remove the EVAP canister hose. 5. Disconnect the canister EVAP line from the fuel sender. 6. Squeeze the small retainer in front of the canister in order to disengage the canister. 7. Remove the EVAP canister. Installation Procedure Notice: Do not attempt to straighten kinked nylon pipes. Replace any kinked nylon pipes in order to prevent damage to the vehicle. Do not attempt to repair sections of nylon pipes. Replace damaged nylon pipes. Replace the vapor pipes with original equipment or parts that meet GM specifications. Replace the vapor hoses with original equipment or parts meeting GM specifications. Use only reinforced fuel-resistant hose identified with the word Fluoroelastomers or GM 6163M on the hose. 1. Install the EVAP canister. 2. Squeeze the small retainer in front of the canister in order to engage the canister. 3. Connect the canister EVAP line to the fuel sender. 4. Install the EVAP canister hose. 5. Position the EVAP canister hose clamp. 6. Connect the EVAP line (3) to the canister. 7. Install the fuel tank.

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1. 2. 3. 4. Turn the ignition switch ON (II). Clear the DTC with the HDS. Remove the fuel fill cap for 5 seconds , then install it. Start the engine. Hold the engine speed at 3,000 rpm with no load (in Park or neutral) until the radiator fan comes on, then let it idle. Monitor the OBD STATUS for DTC P2422 in the DTCs MENU with the HDS. Does the screen indicate FAILED? YES – Go to step 6. NO – If the screen indicates PASSED, intermittent failure, system is OK at this time. Check for a poor connection or loose terminals at the EVAP canister vent shut valve and ECM/PCM. If the screen indicates NOT COMPLETED, go to step 2 and recheck. Clear the DTC with the HDS. Remove the EVAP canister vent shut valve from the EVAP canister. Connect the 2P connector to the EVAP canister vent shut valve. Turn the ignition switch ON (II). Do the EVAP CVS ON in the INSPECTION MENU with the HDS. 5. 6. 7. 8. 9. 10. 11. Check the EVAP canister vent shut valve (A) operation. Does the valve operate? YES – Check for a blockage in the EVAP canister, then install the EVAP canister vent shut valve, and go to step 14. NO – Go to step 12. 12. Turn the ignition switch OFF. 13. Replace the EVAP canister vent shut valve. 14. Turn the ignition switch ON (II). 15. Reset the ECM/PCM with the HDS. 16. Do the ECM/PCM idle learn procedure. 17. Turn the ignition switch OFF. 18. Remove the fuel fill cap for 5 seconds , then install it. 19. Start the engine. Hold the engine speed at 3,000 rpm with no load (in Park or neutral) until the radiator fan comes on, then let it idle. 20. Check for Temporary DTCs or DTCs with the HDS. Are any Temporary DTCs or DTCs indicated? YES – If DTC P2422 is indicated, check for poor connections or loose terminals at the FTP sensor or the EVAP canister vent shut valve and the ECM/PCM, then go to step 1. If any other Temporary DTCs or DTCs are indicated, go to the indicated DTC’s troubleshooting. NO – Go to step 21. 21. Monitor the OBD STATUS for DTC P2422 in the DTCs MENU with the HDS. Does the screen indicate PASSED? YES – Troubleshooting is complete. NO – If the screen indicates FAILED, check for poor connections or loose terminals at the FTP sensor or the EVAP canister vent shut valve and the ECM/PCM, then go to step 1. If the screen indicates NOT COMPLETED, go to step 16 and recheck.

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REMOVAL PROCEDURE CAUTION: Refer to Hoist Caution in Service Precautions. 1. Raise the vehicle. Refer to Vehicle Lifting. 2. Mark the hoses for installation on the EVAP canister. 3. Remove the EVAP vent hose (1). 4. Remove the fuel tank vapor hose (2). 5. Remove the purge hose (3). 6. Remove the nuts (2) from the EVAP canister. 7. Remove the EVAP canister (1) from the bracket by releasing the tabs. INSTALLATION PROCEDURE 1. Install the EVAP canister on the bracket. 2. Install the EVAP canister assembly into the vehicle. NOTE: Refer to Fastener Notice in Service Precautions. 3. Assemble the EVAP canister to the underbody with the 3 nuts. Tighten Tighten the nuts to 9 Nm (80 lb in) . 4. Install the purge hose (3) to the EVAP canister. 5. Install the fuel tank vapor hose (2) to the EVAP canister. 6. Install the vent hose (1) to the EVAP canister 7. Lower the vehicle.

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REMOVAL PROCEDURE 1. Turn OFF the ignition. CAUTION: Refer to Hoist Caution in Service Precautions . 2. Raise the vehicle. Refer to Vehicle Lifting. 3. Bend the retaining tab for the EVAP canister vent valve. 4. Remove the valve from the bracket. 5. Disconnect the electrical connector from the EVAP canister vent valve. 6. Loosen the vent hose clamp and remove the vent hose from the EVAP vent valve. 7. Remove the EVAP canister vent valve from the vehicle. INSTALLATION PROCEDURE 1. Connect the vent hose to the EVAP canister vent valve and tighten the hose clamp. 2. Connect the electrical connector to the EVAP canister vent valve. 3. Install the EVAP canister vent valve to the bracket. 4. Bend the retaining tab for the EVAP canister vent valve. 5. Lower the vehicle

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IF YOU CONFIRM: A MIL “ON” with one or more of the following DTC(s) stored: • P0442 / P0448 / P0455 / P0456 / P1446 AND • EVAP Vent Control S/V is stuck open or will not seal when operated/closed. ACTIONS: 1. Replace the EVAP Vent Control S/V. 2. Install the Filter Kit (refer to the Service Procedure in this bulletin). 3. Clear any DTCs stored in the ECM. SERVICE PROCEDURE Replace Vent Control Valve 1. Replace the EVAP Vent Control S/V. • Refer to section EC in the Service Manual for replacement information. Install Filter Kit 1. Remove the spare tire. 2. Remove the EVAP canister mounting bolt (see Figure 1). • The canister will drop about 3 inches which will give you working room at the top. 3. Disconnect the vent hose (see Figure 1). 4. Reach above the EVAP canister and disconnect the vent hose at the vent control valve and remove the hose (see Figure 2). • Twisting the hose at the opposite end will help loosen it at the vent control valve. 5. Remove the vent hose connector; pull it straight out (see Figure 2). 6. Install the new vent hose connector—included in the filter kit (see Figure 3). 7. Cut out the template on page 10 and place it on the frame rail as shown in Figure 4. • Make sure the template is aligned (straight) with the frame rail. 8. Center punch and drill at the locations shown in Figure 4: • Upper location: Drill a 13/32 (10 mm) hole. • Lower location: Drill a 5/16 (8 mm) hole. Center punch and drill here: 13/32 (10 mm)