GM Automotive Technicians Technical Discussion and Fixes for Feb 9, 2015 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1995 Chevrolet Caprice Classic 5.7L Cuts out, Stall, Misfire VIN: 1G1BL82P9S Posting for the person who will be replacing my roof this spring, vehicle is at another shop. As an import specialist, we know enough about GM products to be dangerous. The shop was not able to pull codes. When this car acts up, the engine and brake lights wil...	View
	1997 Chevrolet K3500 Cheyenne 5.7L Poor Idle Quality, Misfire VIN: 1GCHK34R7V truck idles rough , no misfire codes and not showing a misfire , repl fuel pump and found hose in tank to pump loose, fuel trims on bank 2 22% bank 1 6%, fuel pressure 58psi it was 40psi before repl. pump. did not find any vacuume leaks.,,cust. did have an old... Trouble codes: P0174	View
	2003 Chevrolet Venture LT 3.4L No Start VIN: 1GNDX13E53 We have replace cam sensor,crank sensor and wiring pigtail to crank sensor,It was staring once in a while but now will not start no communication from crank or cam sensor.Have replace crank snsor 2 times.loosing 24x signal Trouble codes: P0336	View
	2006 Chevrolet Trailblazer LT 4.2L charge light VIN: 1GNDS13S56 Thanks for your help. Hopefully someone has seen this before. The alternator light in the cluster is on all the time about half the brightness of the regular bulb check. When the key is turned on all lights come on including the alternator light at regular lev...	View
	2012 Chevrolet Sonic LTZ 1.8L HVAC Blower Fan VIN: 1G1JE6SH8C Customer has to put on 40 to 60 miles before it acts up. Blower fan is inoperative regardless on speed position. She says it seems to act up more the colder it is outside, like below 0. When it acts up, she waits approximately 5 minutes, while still driving an...	View
	2002 GMC Sierra 1500 SL 5.3L radio VIN: 2GTEK19T92 wired in factory connector,installed factory deck,will light up,can change stations but no volume,deck was working when took out of parts truck.if I take key out put power to green wire,key power,it works,with key on 2 powers and ground it doesn't work.truck h...	View
	2005 GMC Sierra 1500 SLE 5.3L Oil Pressure VIN: 2GTEK13T65 Thanks in advance for any help on this one. Customer came in with low oil pressure and lifter noise. We recommended oil pump with understanding may have other problems. Oil pan was full of sludge. After cleaning oil pan and screen we replaced pump and still ha...	View
	2005 GMC Yukon XL 1500 SLE 5.3L driver seat and both heated seats VIN: 3GKEC16Z55 the heated seats dont work on either front seats,driver seat has no movement as well passenger seat and adjustable foot pedal works. scantool wont communicate with memory seat module. both door modules show heated seat active when you push the button. all wiri...	View
	2007 GMC Yukon Denali 6.2L Stall VIN: 1GKFK63837 vehicle will stall as you come to a stop sign. sometimes will not start for ten minutes. it has stalled one time while we were test driving the vehicle. without turning the key off i checked for engine rpm on a scanner and it was good. the fuel pressure was no... Trouble codes: P0011, P0449	View
	2005 Pontiac Grand Prix 3.8L heatre VIN: 2G2WP52235 loose heat going down the road. when at idle heat comes back, when on high blower speed- loose heat. 3 times come back for lack of heat- Acts like an air pocket. No coolent in Oil. check for head gasket failure- ok same to have alot of air in system when it co...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1997 Buick Skylark Limited 2.4L security system VIN: 1G4NJ52T2V I'm calling this fixed. I was looking it over with the tech 2, and I found an option to reset the security system. What this does is erase everything in the security system and relearns all the proper passwords. Here is my theory as to why it wouldn't work ...	13
	2001 Buick Park Avenue 3.8L Lt Turn VIN: 1G4CW54K41 Sorry for closing this so late. I finally found the flasher module which is above the lamp module mounted to the same bracket. I took Mike's advice and after pulling down the 2 modules I could see the flasher so I released it and had just enough wiggle to get ...	8
	2008 Cadillac Escalade 6.2L Mechanical VIN: 1GYFK63828 well we replace the (dod) lifters with regular style lifters as that is what this year vehicle is supposed to have. we found that the engine was from an 2007 escalade & that's why it had all the dod hardware. truck still has very slight misfire at idle which w...	7
	1990 Chevrolet C1500 Cheyenne 5.7L Mechanical VIN: 1GCDC14KXL Thanks for all the replies. My son hasn't finished the repair yet, but here is the info I have. The lack of oil from the rockers was taken care of by adjusting the rockers. It is a mechanical noise not a spark knock so we didn't go that direction. We have ...	54
	2011 Chevrolet Cruze LT 1.4L Poor Idle Quality, MIL Lamp on VIN: 1G1PF5S94B Hey guys thanks for all the help. I checked the PCV valve and just like most of you said it was leaking vacuum badly. So I replace the camshaft cover with a new PVC valve and it runs like a new one thanks again!! Trouble codes: P1101 (Intake air flow system), P0171 (Fuel trim lean), P0106 (Manifold absolute pressure problem).	14

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