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This PI was superseded to advise dealers there is no repair for early oil change messages or erratic OlM operation. Please discard PIP4540B. The following diagnosis might be helpful if the vehicle exhibits the symptom(s) described in this PI. Condition I Concern: A dealer may encounter a customer concern of the oil life monitor (OlM) percentage dropping too qUickly, or an early oil change message. A customer utilizing the oil life monitor may be directed to change the oil at (or near) 1000 mile intervals. Recommendation Ilnstructions: Please do not replace the IPC or ECM for an early oil change message. Oil life monitoring is dependent on vehicle use. Oil life monitoring and change intervals will differ depending on how the vehicle is driven. Please complete the current SI diagnostics for any trouble code or symptom found. Engine drivability concerns may induce early oil change messages or erratic OlM operation. Dealers should verify there are no intake or exhaust leaks by completing Charge Air Cooler Diagnosis (Full System Air leak Test and the Induction System Smoke Test). Discuss driving habits with the customer. The main contributor to early or erratic oil change messages may be some of the customers driving habits. Drive cycles that include short trip, stop and go, and extended idle times are a few of the contributors to early oil change messages. Customers with more exhaust regenerations (due to driving habits) are more susceptible to qUicker oil change messages. There is no repair for early oil change messages or erratic OlM operation. If a dealer is to encounter a vehicle with a customer concern of early oil change complete a Field Product Report using the newest version of bulletin 02-00-89-002. Note: If an oil analysis has been completed fuel dilution should not be over 12%.

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On some 2003 model year Cadillac Escalade, Escalade EXT, and Escalade ESV; Chevrolet Silverado, Avalanche, Tahoe, and Suburban; GMC Sierra, Yukon, and Yukon XL; and HUMMER H2 vehicles, the passenger door module (PDM) may become inoperative. An inoperative PDM would cause loss of function for the remote keyless entry, front passenger power window, lock, mirror and heated seat functions. Correction Dealers are to reprogram the PDM. Service Procedure Important: The labor time for performing the refresh/reprogram of the passenger door module in this recall is different than the amount of time allowed in Service Bulletin 03-08-52-001B. The labor operation code and time allowance in the service bulletin was for a BCM reprogram, and was not the correct labor operation code for this repair. Inspection Procedure Important: The following inspection must be performed in order to determine the correct repair procedure. 1. Turn the ignition to the ON position. 2. Using the switches in the right front passenger door, verify that the power window and power door lock located in that door, function properly. • If the power window and door locks do NOT function, proceed to the “Refresh and Reprogram” procedure and follow ALL of the steps. • If the power window and door lock function properly, the vehicle only needs to be updated with the new calibration for the passenger door module. Proceed to and follow only steps 4-6 in the “Refresh and Reprogram” procedure. DO NOT PERFORM STEPS 1-3. Refresh and Reprogram Procedure

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Condition General Motors has decided that a defect, which relates to motor vehicle safety, exists in certain 2001 model year Chevrolet Silverado, Suburban; GMC Sierra and Yukon XL model vehicles, equipped with an 8.1L V8 (RPO L18 – VIN G) engine. Some of these vehicles have a condition in which the crankshaft position sensor can fail intermittently or permanently. If the sensor fails intermittently, the Service Engine Soon (SES) light may illuminate and the vehicle may run rough. In addition, the engine may stall, and if so, may re-start immediately or after a cool down period. If the sensor fails permanently, the engine will quit running and will not re-start.

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Customer Concern: Tests/Procedures: Potential Causes: Diagnostic Codes: The service engine soon light is on with trouble code P1416 present. 1. Use a scanner and command the air pump on with the engine running at idle. Check if the O2 sensors go lean. 2. If the O2 sensor does not go lean on one bank, see if the check valve at the exhaust manifold is stuck closed, not allowing air into the manifold. Defective Check Valve P1416 Confirmed Fix Summary Confirmed Fix 18 – Air Injection Reaction (AIR) Check Valve 1 – Air Injection Reaction (AIR) Check Valve, Air Injection Reaction (AIR) Pump

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Vehicle Application: Customer Concern: Tests/Procedures: Potential Causes: Diagnostic Codes: 2002 GAS, 2003 GAS, Chevrolet Silverado 1500 4.8L, Vin V, Eng Cfg V8, USA/Canada Chevrolet Silverado 1500 4.8L, Vin V, Eng Cfg V8 The engine runs, but lacks power when driving. Has codes P0101 and P0300. Scanner shows misfires all on the same side of the engine. 1. Check the catalytic converter, on the “suspect” bank of the engine, for a restricted (plugged) exhaust system to that side of the engine. 2. Disconnect both front O2 sensors, re-set the fuel trims and see if the problem goes away. 3. If gone with the O2 sensors disconnected, then swap the sensors side to side and see if the problem follows the O2 sensor. Plugged Exhaust System Oxygen Sensor P0101, P0300 2003 Chevrolet Tahoe 4.8L, GAS, Vin V 2003 Chevrolet Tahoe 5.3L, FLEX, Vin Z