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Condition/Concern: Some customers may comment that they are unable to override the automatic door locking feature. In prior model years, customers were able to select “Doors Lock Manually” from the DIC. However, starting in the 2005 model year, this selection was removed. Recommendation/Instructions: Since the 2005 model year, all BCM’s (Body Control Modules) are programmed from the factory to lock all doors when the transmission is shifted into gear or vehicle speed is greater than 8 mph (13 km/h). There is no option to disable the auto door locks from the factory, but if an owner wishes to have the auto door locks disabled the following procedure can be performed: 1. Use the following procedure to disable the auto door locks on the models listed below: 2007-2008 Cadillac Escalade, Escalade ESV, Escalade EXT 2007-2008 Chevrolet Avalanche, Silverado (new body style), Suburban, Tahoe 2007-2008 GMC Sierra (new body style), Yukon, Yukon Denali, Yukon XL, Yukon Denali XL Reprogram the BCM with updated calibrations currently available in Tis2Web. In some rare instances, the calibrations may not be available in Tis2Web and Techline Customer Support should be contacted to obtain the calibrations. When at the “Calibration Selection” screen in Tis2Web, select “locking” (should be highlighted in Red) and pick the calibration listed as “(Per Customer Request Only) Auto door locks off, option no longer in DIC”.

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Condition Some customers may comment on an engine valve lifter tick noise that occurs after the engine has been shut off for at least two hours. The tick noise may last from two seconds to ten minutes. Cause This condition may be caused by any of the following: • Aerated oil in the valve lifter body, resulting in the valve lifter being unable to purge the air quickly. • A low engine oil level or incorrect oil viscosity. • Dirty or contaminated oil. • A low internal valve lifter oil reservoir level. • Debris in the valve lifter. • A high valve lifter leak down rate. Correction If the SI diagnostics do not isolate the cause of this valve lifter tick noise and normal oil pressure is noted during the concern, perform the following steps: 1. Inspect the engine oil condition and level. Refer to Owner Manual > Service and Appearance Care > Checking Things Under the Hood > Description and Operation > Engine Oil in SI. ? If the engine oil is more than one quart low, an incorrect oil viscosity is being used or if poor quality/contamination is observed, change the oil and filter. Note: Allow at least a two hour soak time between engine OFF and start up when evaluating the tick noise. 2. Start the engine and evaluate the valve lifter tick noise. ? If the valve lifter tick noise is still present, replace all 16 valve lifters. Refer to Valve Lifter Replacement in SI.

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Some customers may comment on a clunk, bump or squawk noise when the vehicle comes to a stop or when accelerating from a complete stop. Cause A slip/stick condition between the transfer case output shaft and the driveshaft slip yoke may cause this condition. Diagnostic Tips There are several resources in the electronic Service Information System which can provide the technician with information on diagnosis and repair of clunk conditions, and fix the customer’s vehicle right the first time without unnecessary parts replacement. Some of the documents available in SI include: • Symptoms – Propeller Shaft (SI Document ID #697266) • Knock or Clunk Noise (SI Document ID #697290) • Rear Drive Axle Noises (SI Document ID #700580) • Launch Shudder/Vibration on Acceleration (Replace Propeller Shaft and Install a New Pinion Flange/Seal), Bulletin #02-04-17-001 • Information on 2-3 Upshift or 3-2 Downshift Clunk Noise, Bulletin #01-07-30-042 • Driveline Clunk When Stopping (Reprogram Powertrain Control Module (PCM), Bulletin #03-07-30-028 Correction Replace the rear drive shaft slip yoke with a new nickel-plated slip yoke. See the parts table below. Follow the service procedure below. 1. Raise the vehicle on a hoist. Refer to Lifting and Jacking the Vehicle in General Information (SI Document ID #349918). 2. Reference mark the propeller shaft to the pinion flange connection. Important: Do not pound on the propeller shaft yoke ears. Never pry or place any tool between a yoke and a universal joint. 3. Remove the bolts and the yoke retainers from the pinion flange. 4. Slide the propeller shaft forward and out of the rear pinion flange. 5. Lower the rear of the propeller shaft and pull the driveshaft out of the transfer case.

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Some of the above vehicles may exhibit an engine knock noise that begins in the first 19,000-24,000 km (12,000-15,000 mi) of use. The knock noise is most often noticed during initial start- up and typically disappears within the first 5-30 seconds (may last longer in extreme cold temperatures). The noise is usually more noticeable on the initial start-up when the temperature is below 10°C (50°F) and may be more pronounced on the first cold start following a long trip. This noise may be caused by an interaction between carbon that has formed on the piston, the piston motion and the cylinder wall. GM Powertrain Engineering, and an analysis of engines with this condition, has confirmed that the noise is not detrimental to the performance, reliability or durability of the engine. THIS NOISE DOES NOT HAVE ANY EFFECT ON THE LONGEVITY OF ANY OF THE ENGINE COMPONENTS. Important: At this time, attempts to repair this condition by replacing the engine assembly or pistons are not recommended. Please share the information found in this bulletin with customers who inquire about this condition. In the event they have additional questions or concerns, please advise your Area Service Manager.

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Condition Some customers may comment on a clunk-type noise coming from under the hood that also can be felt in the steering wheel. These conditions may be more noticeable when turning at low speeds on rough road surfaces. Diagnostic Tips Use the information below to help diagnose the source of the noise. • The lower steering column bearing may 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-shaft where it attaches to the steering column. • 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). • Intermediate Shaft Clunk — Intermediate shaft clunk is heard and FELT in the steering wheel and/or steering column area, typically while driving on rough road surfaces with steering wheel input. Correction DO THIS DON’T DO THIS Replace the I-Shaft with P/N 19153614. • I-shaft P/N 19153614 has been designed to replace previous designed dampened and non- dampened I-shafts. The physical difference in the yoke size will accommodate all vehicles listed in this bulletin. • Due to the design of the new I-shaft, it is not possible to lubricate/grease the I- shaft. 1. Set the front wheels in the straight ahead position. Do NOT lubricate or exercise the I-Shaft.