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map sensor or other sensors usually set off an obd ll code look at air filter gauge its on duct that runs from air box to throttle body if it is in red change filter also check and or change fuel filter these to filters usually dont set off a trouble[ obd ll ]codes also when was last tune up --wires,cap,plugs,egr cleaning,replace filters etc.your most likely problem would be the fuel filter
Im guessing the vehicle wont start? If so you shouldnt rule out fuel just because your getting fuel to the shrader valve, these vehicle require a certain amount of fuel pressure to run, im guessing around 60psi, so i would check fuel pressure, if ok keep in mind that these vehicles also had a problem with early failure on the fuel injectors, GM sells a new design injector set up for them.
Here is a TSB (Technical Service Bulletin) for your vehicle for loss of temp control. File In Section: 01 - HVAC Bulletin No.: 01-01-39-007 TECHNICAL Subject: Loss Of HVAC System Mode and/or Temperature Control
(Reroute Wiring Harness)
Models
1999-2002 Chevrolet and GMC C/K Pickup Models (Silverado and Sierra) 1999-2002 Chevrolet and GMC C/K Utility Models (Avalanche, Suburban, Tahoe, Yukon, Yukon XL, Denali) 2001 GMC Sierra C3
2002 GMC Sierra Denali
2002 Cadillac Escalade, Escalade EXT
Some customers may comment that they cannot control the HVAC system modes and/or the temperature. These concerns may be intermittent.
Cause
There may be poor terminal contact and/or bent terminals in connectors C206 (RPO C68 automatic HVAC controls) or C296 (RPO C60 manual HVAC controls). Excessive tension on the wires due to the wiring harness being miss routed in the instrument panel carrier may cause these conditions.
If the warranty campaign is over i am sure they can or may have in the system on how to correct the problem.
Good luck and hope this helps, keep me posted if you need help on to the repair procedure.
Had this problem myself. After a bunch of run around, it turned out to be just a line that was not properly sealed. I was told at the time that the control panel for the air conditioning system in the Yukon was known to go bad and that replacing it would fix the problem. Hope this helps
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