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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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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.

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Subject: Audible Spark Knock (Detonation), MIL Illuminated, DTC P0332 Set (Replace Rear Bank Knock Sensor and RTV Area Around Sensor) Models: 1998-2002 Chevrolet Camaro, Corvette 1998-2002 Pontiac Firebird with 5.7L Engine (VIN G – RPO LS1) 1999-2002 Chevrolet Silverado, Suburban, Tahoe 2002 Chevrolet Avalance 1999-2002 GMC Sierra, Yukon, Yukon XL 2002 Cadillac Escalade, Escalade EXT with 4.8L, 5.3L or 6.0L Engine (VINs V, T, Z, N, U – RPOS LR4, LM7, L59, L09, L04) This bulletin is being revised to add Cadillac Escalade and Cadillac Escalade EXT to the Models. Please discard Corporate Bulletin Number 02-06-04-023 (Section 6 – Engine/Propulsion System). Condition Some customers may comment on a mild to severe engine ping (commonly referred to as spark knock), usually worse during acceleration and/or an illuminated MIL. Upon investigation, the technician may find DTC P0332 set. Cause This condition may be the result of corrosion of the rear bank knock sensor due to water intrusion into the sensor cavity. This condition is more apparent on vehicles in which customers frequently wash the engine compartment