GM Automotive Technicians Technical Discussion and Fixes for Dec 1, 2011

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Open Help Requests for GM

	Help Request	Answers
	1998 Buick Park Avenue 3.8L Engine/trans Vibration VIN: N0TAVAVA1W Hey everyone, im new to this so i hope i give enough information! thanks in advance for all the ideas. Currently at the shop im working on a 98 park ave 3.8L, it has a very loud vibration when the vehicle is steered at all to the right(slight or hard turns don...	View
	2006 Buick Terraza CXL 3.5L abs VIN: 5GADV33L56 This Buick Terraza will turn on the ABS and stability control lights on the dash. You can start the vehicle and it will run and not turn them on. You can push the brake pedal and it will not turn them on BUT if you turn the steering wheel from rht to left it w...	View
	1999 Chevrolet Cavalier LS 2.2L Rear Defoster Rear defoster stays on all time if turn switch on and off does not turn off	View
	2000 Chevrolet Silverado 1500 5.3L Hesitation, MIL Lamp on VIN: 2GCEK19T8Y Customer said runs rough cold and hesitates cold. Smoke tested intake and found leaking gaskets. repaired and cleared codes. Mass air flow did not come back but it still has high fuel trim and seems to idle a little funny. dont have time to wait for it to get ... Trouble codes: P0101, P0161, P0463	View
	2002 Chevrolet Avalanche 2500 8.1L No Start, Stall VIN: 3GNGK23G52 Vehicle died on highway, no start, fuel pressure reads 65psi, have changed crank and cam sensors. No codes with snapon scanner.Cylinder one fires when first cranked, then nothing after that. No others fire at all. The security light no longer flashes, maybe so...	View
	2002 Chevrolet Tahoe LS 5.3L Drive-axles VIN: 1GNEK13Z82 Ok What I want to know if some has had this problem before. This truck feels like you are in 4 wheel drive when you are in 2 wheel drive. Only when you are turning the front axles bind. I have front drive shaft out and Front Axle Actuator out still binds when ...	View
	2002 Chevrolet Tahoe LS 5.3L Drive-axles VIN: 1GNEK13Z82 Ok What I want to know if some has had this problem before. This truck feels like you are in 4 wheel drive when you are in 2 wheel drive. Only when you are turning the front axles bind. I have front drive shaft out and Front Axle Actuator out still binds when ...	View
	2002 Chevrolet Tahoe LS 5.3L Drive-axles VIN: 1GNEK13Z82 Ok What I want to know if some has had this problem before. This truck feels like you are in 4 wheel drive when you are in 2 wheel drive. Only when you are turning the front axles bind. I have front drive shaft out and Front Axle Actuator out still binds when ...	View
	2002 Chevrolet Tahoe LS 5.3L Drive-axles VIN: 1GNEK13Z82 Ok What I want to know if some has had this problem before. This truck feels like you are in 4 wheel drive when you are in 2 wheel drive. Only when you are turning the front axles bind. I have front drive shaft out and Front Axle Actuator out still binds when ...	View
	2003 Chevrolet Tahoe LT 5.3L alternator VIN: 1GNEK13Z43 Hello thanks in advance, customer states he replaced battery and ever since it does not want to idle when warm- no codes, can visually see all lights flickering and voltage guage on dash bounces between 11-14ish at idle, runs great right after startup untill i...	View
	2003 Chevrolet Tahoe LS 5.3L Headlamps VIN: 1GNEK13T03 Gm techs i have a wierd one here. This tahoes headlamps flicker but faintly. The customer says he notices this in the dash illumination also but i did not.the battery and altornater are new. We have gone to the extent of putting a scope in place of the bulbs b...	View
	2004 Chevrolet Suburban 1500 LT 5.3L shift linkage VIN: 1GNEC16Z94 Vehicle jumps out of gear , owner - driver , claims shift lever will move from drive to neutral, happens during take off . This is happening with several drivers , I have driven this vehicle several times and not duplicated problem. I have checked while drivin...	View
	2005 Chevrolet Colorado Z85 3.5L ATC-transfer case shifting VIN: 1GCDT19625 Vehicle came with with complaint of 4wd operation erratic-shifts to 4H sometimes when commanded, sometimes not. When commanded to 2wd vehicle would sometimes shift right away, and sometimes down the road a ways. Raised on hoist and found front axle mechanical ...	View
	2008 Chevrolet Impala LS 3.5L No Start VIN: 2G1WB58K38 This car has an aftermarket remote starter installed and the technician burned the theft deterent module by accident. So he replaced it with a used module and towed the car in my shop for a reflash. I put the Tech2 with Tis2Web and reflash the VTD with the rig... Trouble codes: P0633 (Theft Deterrent Key Not Programmed), B3935 (57- Transponder Authentication Error), B3031 (00- Security System Controller In Learn Mode)	View
	2010 Chevrolet Impala LS 3.5L no heat at idle VIN: 2G1WA5EN2A back flushed heater core & changed thermostat	View
	2011 Chevrolet Silverado 3500 HD LTZ 6.6L Excessive Emissions, Cuts out My fathers truck that my shop services, we know well, and always do the services before they are due. That said,recently the cluster says that the exhaust fluid is low when it actually is full. Every time it states this I get a phone call. He stops in and we t...	View
	1997 GMC Yukon SL 5.7L pedal VIN: 3GKEK18R4V I received a truck that has been at another shop,other than parts that where replaced the details I received are pretty vague. What I am experiencing is that is has a low spongy pedal. The previous shop has installed a new master cyl., vacuum power booster,fro...	View
	2006 Pontiac G6 2.4L Cranking Circuit VIN: 1G2ZF55B66 Hi techs! this vehicle has been intermittently not cranking over the last year, when this happens there is an "error" message at the odometer display. This vehicle was again here last month for a no crank situation. Battery tested very poor so we replaced it a...	View
	2007 Pontiac Montana SV6 3.9L Accessories VIN: 1GMDU03167 will not start with remote start , tail lites flash when button is depressed , but nothing happens . no codes peresent in any modules , it is a factory remote start , never got into fixing one of these before any advice ..thanks to all members	View
	1996 Saturn SC2 1.9L Mechanical VIN: 1G8ZG1276T In the cold weather customer backs out of the driveway in reverse no problem first thing in the morning, goes to shift into first and cannot get it into 1st, pumping the clutch pedal she says sometimes helps not always, and shutting off the car sometimes helps...	View
	2000 Saturn LW2 3.0L door locks VIN: 1G8JW82R5Y Customers complaint is that the drivers door will not unlock automatically when put into park or when the key is removed. Vehicle had a blown fuse to BCM2, replaced fuse but door lock still not unlocking when put into park. The doors lock normally when put int...	View
	2001 Saturn SL2 1.9L noise VIN: 1G8ZK52741 Greetings, I have this sl2 in the shop and when you slow down from about 50mph there is a rotational squeak from the front end that gets real loud the slower the vehicle goes. I tried reproducing it on the lift but it will not do it on the lift. I've replaced ...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	2005 Buick LaCrosse CXL 3.8L Abs Module VIN: 2G4WD56285 THANKS FOR AL [...] THE IDEAS, VEHICLE HAS NOT HAD A PROBLEM IN LAST 3 WEEKS AFTER REPLACING THE WHEEL HUB ASSEMBLY FOR THE 2ND TIME. PROBABLY WILL NEED THE HARNESS PIGTAIL REPLACED IF IT ACTS-UP AGAIN.	27
	2001 Cadillac Seville STS 4.6L MIL Lamp on VIN: 1G6KY54941 Thank you everyone for your responses. The problem ended up being a faulty air solenoid(new from dealer) as well as a small pinhole in one of the vac. lines. when the solenoid would engage and allow vac. it would only pull around 10 not enough to open the shut... Trouble codes: P0410.	18
	2007 Cadillac CTS 2.8L No Start VIN: 1G6DM57T07 I want to thank all that offered suggestions. We're not sure if this car is fixed or not, We replaced the CTS as the most likely cause. Another suggestion was a cranshaft position sensor getting weak. We recommended replacement but customer declined further r...	9
	1999 Chevrolet Express 3500 5.7L Poor Idle Quality, Cuts out, Backfires VIN: 1GCHG39R0X Well this one is fixed. I gave it a week or so to close this just to be sure. We pulled it in one morning and did three things. Removed and cleaned the 02 sensors with propane torch, cleaned the main ground on the bottom of the block that battery goes to(that ...	22
	2002 Chevrolet Trailblazer LS 4.2L Air Distribution VIN: 1GNDT13SX2 i have tried all the ideas you guys sent me, but to no avail so for now ive put this thing on that big back burner we all have. when i get back on it ill let everyone know what fixed it. of course it will be something simple i missed. anyways thanks to everyon...	7
	2005 Chevrolet Uplander LS 3.5L fuel guage VIN: 1GNDV23L55 Craig from Illinois nailed it for us by informing us of this: PM per chevy bulletin [...] no buffering of the fuel level signal in park or nuetral. this will be more apparent with a fuel level of 1/4 or less.	4
	2003 Pontiac Grand Prix SE 3.1L engine VIN: 1G2WK52J83 hey everybody i am probably going to just replace the engine and be done with it, rather then tear it down for curiousity sake. back 2 cyl,s have scorring below the ring lands. yes below the ring lands ??? near piston skirts. cause of nock piston slap maybee ...	34
	2009 Pontiac Vibe 2.4L MIL Lamp on VIN: 5Y2SM67039 I will call this a fix, and re-post if it comes back. Michael from South Carolina said it sounded like a faulty part, and try to warranty it, so I warrantied the cannister, and replaced it. It had either a bad vacuum pump, a plugged reference orfice, or a sl... Trouble codes: P043E.	4

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