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Subject: Clunking Noise Under Hood and Can Be Felt in Steering Wheel and/or Steering Column(Replace Upper Intermediate Steering Shan [I-Shaft] Assembly) Models: 2002-2006 Cadillac Escalade Models 1999-2007 Chevrolet Silverado Models (Classic) 2000-2006 Chevrolet Suburban, Tahoe Models 2002-2006 Chevrolet Avalanche 1999-2007 GMC Sierra Models (Classic) 2000-2006 GMC Yukon, Yukon XL Models 2003-2006 HUMMER H2 A The lower steering column bearingmay create the same noise as the intermediate shaft. Before replacing the I-shaft, verify the noise isn’t being caused by movement from the lower steering column bearing. Check the bearing for movement by pushing up and down on the I-shaf where it attaches to the steering column A Frame Snap and/or Popping Type Noise – A frame snap or popping type noise can be duplicated on rough or smooth road surfaces with steering wheel input to the left or the right. This type of noise can be HEARD and is typically louder with the windows rolled down. For additional information refer to Corporate Bulletin Number 03-08-61-002F or newer – Snap/Popping Type Noise Coming from Front of Vehicle (Remove Front Crossmember Change Fastener Orientation

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Test Description The numbers below refer to the step numbers on the diagnostic table. 2. Allow the engine to cool before performing this test. If the sensor is at the operating temperature, the HO2S voltage will stay high or low. If the HO2S voltage stays between 300-700 mV this indicates the HO2S heater is inoperative. 3. If more than one HO2S DTC is set, this is a good indication that the HO2S fuse is open. Test all the related circuits going to all the heated oxygen sensors for a short to ground. If you cannot locate a shorted circuit, it may be necessary to disconnect each HO2S one at a time to locate a shorted sensor. 4. This step determines if an ignition positive voltage supply is available at the sensor.

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1999-2007 Chevrolet Silverado 1500 Series Condition Some customers may comment on a moan or vibration noise at low vehicle speeds 40-64 km (25-40 mph) or between 900-1700 RPM under load. Cause Exhaust system resonance may be transmitted through the powertrain mounts into the body causing this condition. Correction Caution: Personal injury or burns may occur when working on a hot exhaust system, let the exhaust system cool off prior to performing the repair. An exhaust system flex pipe kit is available to correct this condition. If diagnosis leads to this condition, install the applicable exhaust system flex pipe kit listed below using the following procedure. Refer to the Parts Information for kit applications and usage. Important: This fix and the kit part numbers are specific to vehicle frame type. A Level 3 frame was introduced interim 2000 model year (approximately January 2000). With a Level 3 frame, the transmission crossmember was moved forward of its previous location. Pre-Level 3 frames will require the installation of additional components to correct the condition.

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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)

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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.