GM Automotive Technicians Technical Discussion and Fixes for Jul 12, 2011 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1989 Cadillac DeVille 4.5L r 12 VIN: 1G6CD1158K local cadalic dealer said r12 only for a recharge.no other possibalites. can a orfice tube be added for a higher low side pressure? thanks in advance, dale.	View
	1999 Cadillac Seville SLS 4.6L a/c clutch VIN: 1G6KS54Y8Y Hey techs, We have a cadillac here with no a/c. I've tried disconnecting battery to remove fault codes which did not help. I've tried accessing codes from control head and cannot access by holding in on "off and warmer buttons" simultaneously. My question is ...	View
	1979 Chevrolet Camaro Z28 5.0L window reg;l/f VIN: 1Q87L9N515 Hi gang,got this '79 camaro w/t-tops ;The L/F window reg./motor+ all guides + stop's/adjusters=everything bolted to the inside of door was in a box in back seat! Last week i assembled everything+ got the glass all the way up,but,would either hit the"A" piller ...	View
	1999 Chevrolet Malibu 3.1L tires VIN: 1G1ND52M8X This car came in with a noise in the front, found left front spring was broken. Replaced both front springs and struts. The car pulls to the left sometimes. There is a street here that has just been redone and when I go one way the car is fine but when I turn ...	View
	2001 Chevrolet Blazer LS 4.3L MIL Lamp on VIN: 1GNDT13W51 This Blazer came in for MIL on, with no drivability concerns.Codes were P0300, P0302. On the test drive, the misfire monitor showed very light misfires on CYL. 2,4,3,6. The cam timing PID would show a change of between -1 to -4 deg. We cked for play in the tim... Trouble codes: P0304 (Cyl 4 misfire)	View
	2003 Chevrolet Trailblazer EXT LT 4.2L MIL Lamp on VIN: 1GNET16S43 Hello this truck came in with a p1345 we changed the vvt solenoid due to it being blocked and not moving now it works and we are still getting the same code. We removed the valve cover and checked according to flow chart found no problems movement was with in ... Trouble codes: P1345 (Cam and crank sensor)	View
	2004 Chevrolet Silverado 2500 HD 6.6L shocks VIN: 1GCHK23204 Replaced upper balljoints & front end alinement, truck bounces alot. the front shocks keeping breaking, they appear to be travling to far. has anybody seen this problem,checked ride height seems to be fine. the truck hauls a horse trailer, when it is loaded is...	View
	2005 Chevrolet Equinox LS 3.4L No Start, Poor Idle Quality VIN: 2CNDL23F05 hello everyone, i have two of these trucks that will intermetily not want to start,what happens is that on the first try it cranks but not start, second the same, and maybe on the third it will start. have no codes at this time, i cann't get them to act up in ...	View
	2005 Chevrolet Malibu Maxx LT 3.5L Starting VIN: 1G1ZT62805 Good afternoon all I have this malibu with a condition I think is normal but need some input to insure my thoughts are correct.Customers complaint is when Ign. key is turned to crank and you let go of the key car continues to crank until the car starts.I beliv...	View
	2007 Chevrolet Equinox LT 3.4L shift solenoid 3 VIN: 2CNDL73F77 note: i dont have all the specifics prior to me getting the job to perform diagnostics. when it came in last week the shop did a fluid service on the vehicle and cleared the codes... vehicle came in with somewhat intermittent shifting problems. (see the above...	View
	2011 Chevrolet hd3500 6.6L Poor Fuel Economy VIN: 1GC4K1C88B this truck has me so frustrated, every time i leave the state the def system lets me down and cannot finish my trip home without issues,truck was reflashed in springfield mo.after shutting down the vehicle speed to50mph i added 2.5 gal of def fluid with no hel...	View
	1994 GMC K2500 Sierra SLE 6.5L No Start VIN: 1GTGK29F7R Hi everyone.Need some help with this one.To start off my son bought this truck last Oct with the left cyl head off (cracked)and all the parts in the box.I installed a good head and all parts and it run good.This spring the check eng light would come on at idle...	View
	2002 GMC Envoy SLE 4.2L Reprograming VIN: 1GKDS13S12 Guys can anybody tell me the gm reprograming webpage?. Io would like to check for upddates on this vehicle, las i remember it was si2000 or s2000? can remember or is there another way i can check for an update on this pcm you know (free) thanx for any help. Trouble codes: P0014 (Camshaft sensor performance), P1345 (Crank cam correlation)	View
	2002 GMC Envoy SLE 4.2L no start VIN: 1GKDT13552 Hello this vehicle will not attempt to start cranks normal. there is no spark i replaced crank shaft sensor still no spark. Vehicle came in battery totally dead charged it for a while attempted start no fire . my scan reading for my throttle percentage is 1.50... Trouble codes: 1515 (1516 -), 1516 (testing and results)	View
	2004 GMC Yukon Denali 6.0L Ride control system VIN: 1GKEK63U35 When the customer initially came in he was complaining of the "service ride control" message coming on. We scanned the vehicle with a Pegisys and code c0590 came up saying the right rear solenoid circuit was malfunctioning. After checking the wiring harness an...	View
	2007 Pontiac Grand Prix GT 3.8L No Start, Surge, Cuts out, Stall VIN: 2G2WP55277 Customer came in on friday, and had trouble getting car going, it took ten minutes to getting running ok to drive to the shop. The problem is it it stall sputters and sometimes wont even start. When it wont start the starter has power and ground but no trigger...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1998 Cadillac DeVille 4.6L Unknown VIN: 1G6KD54Y6W Car finally came back. They took to Dealer and dealer told them 8 hours to repair. I fount the drain behind insulation as the replies said. Thanks for the help now have a good customer.	5
	1993 Chevrolet Astro 4.3L Transmission VIN: 1GCDM19Z8P Well I hate to be the turd in the punch bowl but this transmission must have fixed itself or had a random electrical issue so I have no solid answer. When I made this post it was a random problem that, of course, never happens when you try to diagnose the pro...	15
	2000 Chevrolet Blazer LS 4.3L Tcc VIN: 1GNDT13W4Y Hello and thanks to those that responded. Sorry it took so long but my customer went on vacation. Well here it is for what its worth. I tested circuits till I was blue in the face, I found that I could command the converter on and off with my scan tool. I alw...	3
	2004 Chevrolet Blazer LS 4.3L front differential VIN: 1GNDT13X34 Thank You To Every One That Replied. The Actual Repair Was To Route The Vacuum Hoses Properly. The Chevy Service Department and Mitchell Was Unalbe To Find A Diagram, However The Advise From Richard [...] Was Helpful. I contacted The Chevrolet Parts Departme...	7
	2005 Chevrolet Malibu LS 3.5L Monitors VIN: 1G1ZT54805 Thank you for all your help. This one is going to the dealer. We checked all grounds and power feeds with no problems. Believe it to be a nother module clearing the monitors and we don't want to throw new modules in the car at the customers expence. We will k...	6
	2006 Chevrolet Equinox LS 3.4L blower resistor VIN: 2CNDL13F36 Thanks for all the replies, As usual the vehicle needed to be fixed ASAP. The quickest I could get a new connector (w/o terminals) was a couple of days so I shortened up the exixting connector by cutting out the melted terminal and soldering the wire directly ...	6
	2006 Chevrolet Colorado LT 3.5L hard start sometimes VIN: 1GCDT13675 Okay heres what I found after two teardowns again.My timing was indeed correct- spot on. Everything lined up perfectly. I went ahead and replaced the valve timing actuator just to see if that would correct any issues and it imporved a little starting was much ... Trouble codes: P0017 (Crank/cam position bank 1 sensor b- correlation).	6
	2006 Chevrolet Trailblazer SS 6.0L Poor Idle Quality, Misfire VIN: 1GNES13H96 Thanks for all the usefull info. This truck is scheduled for an intake r&r.will ost if that is the problem or not. thanks again for all the help STS Trouble codes: P0305 (Cylinder 5 missfire).	19
	2006 Chevrolet Equinox LT 3.4L Rear Axle VIN: 2CND173FX6 thanks to everyone got ot it to happen on hoist finnaly ended up being dust sheild on cv shaft.so i trimed dust cover and noise is gone	5
	2006 Chevrolet Trailblazer EXT LS 4.2L ac VIN: 1GNDT13S86 replaced blend door actuator and reprogram fixed it.thanks for the info.actuator easy to replace it is located on left side of dash.	3
	2007 Chevrolet Uplander LS 3.9L Cooling System VIN: 1GNDU23157 thank for all the replies hit the nail right on the head. after we replaced the oilcooler we havent had a problem since. thanks so much STS	14
	2003 GMC Yukon SLE 5.3L e-brake warning VIN: 1GKEC13Z84 Replaced BCM and had it flashed at the dealer and also repalced e-brake switch.	4
	2002 Pontiac Sunfire SE 2.2L MIL Lamp on VIN: 1G2JB52452 ok, sorry for taking so long on this. went on vacation for 10 days, we replaced the ignition switch and drove car for about 2 hrs and no more problems. i want to thank everyone who replied.	10
	2008 Saturn Astra XE 1.8L a/c VIN: W08AR67198 Well I think I have solved the problem. I believe this has a variable displacement compressor that is the cause of our problem. This could cause the presure to change at will. the customer has decided to fix it and we have ordered the parts. Since IATN has req...	4

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