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Customer Concern: Tests/Procedures: Potential Causes: Tech Tips: Code C0660 will reset. 1. Check the RTD fuse located in the underhood fuse block. 2. Check for Battery Voltage (B+) on the Orange wire at the automatic level control air compressor pin F. 3. If less than B+ at pin F, check for a wiring and connection problem between the air compressor and the underhood fuse block. 4. Disconnect the compressor leveling module connector and check the resistance from the positive battery voltage circuit of the exhaust solenoid valve and the control circuit of the exhaust solenoid valve. Should be 30-90 ohms. 5. Check for B+ on the Dark Blue wire pin B at the air compressor with the exhaust solenoid commanded off. 6. Check for B+ at the Electronic Suspension Control module connector C2 pin B5 Dark Blue wire with the exhaust solenoid commanded off. 7. If there is B+ at the air compressor but not at the electronic suspension control, check for a wiring and connection problem between the air compressor and the electronic suspension control module. Air Suspension Compressor Vent Solenoid Electronic Suspension Control Ground Power Wiring Conditions for Setting the DTC C0660 • An open in the control circuit of the exhaust solenoid valve • A short to ground in the control circuit of the exhaust solenoid valve • A short to battery in the control circuit of the exhaust solenoid valve • An open in the battery positive voltage circuit of the exhaust solenoid valve • An open RTD fuse • A malfunctioning exhaust solenoid valve

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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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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.

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2011 model year Cadillac Escalade EXT; Chevrolet Avalanche, Silverado; and GMC Sierra vehicles. Some of these vehicles have a condition in which the rear axle cross pin was not manufactured to specification. The pin was improperly heat treated and could fracture and become displaced within the rear axle. If this were to occur, the driver may hear a banging noise coming from the axle. If the pin shifts out of position, it could create an interference condition and cause the rear axle to lock. The driver may not be able to maintain directional control of the vehicle and a crash could occur without prior warning. SERVICE PROCEDURE 1. Lift and support the vehicle. Refer to Lifting and Jacking the Vehicle in SI. 2. Shift the transmission into “N” Neutral. 3. FOR SUV ONLY: Remove the LH track bar attachment bolt using a 21 mm socket. 4. FOR SUV ONLY: Remove with a screwdriver the emergency brake cable clip from the track bar. 5. FOR SUV ONLY: Raise the track bar, hanging it with a hook to the frame. 6. Take the cover pan bolts off using a ratchet with a 13 mm socket. Hold the cover pan with your hand to drain the oil in a container. Dispose of the bolts. 7. When most of the oil is drained, remove cover pan and gasket. Store the cover pan and gasket in a secure area. 8. While holding one wheel, turn the other wheel until the lock screw is visible. 9. Remove the lock screw with a ratchet with a 5/16” hexagonal socket while holding the cross pin with a magnet. Dispose of the lock screw. 10. Remove the cross pin by pulling it with the magnet. Discard the cross pin. 11. Using a magnet, insert a new certified cross pin without moving the case position, aligning the cross pin hole with the lock screw hole. 12. Replace the lock screw with a new one and tighten by hand until it stops. Apply a static torque of 35 Nm (26 lb-ft) with a pre-set clicker wrench. Certify the torque applying a slash through the lock screw head and the differential case. 13. Visually inspect the gasket for damage and replace if necessary. 14. Position gasket and cover pan ensuring proper alignment making sure not to damage the gasket.