GM Automotive Technicians Technical Discussion and Fixes for Jun 25, 2008 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	2004 Buick Rendezvous CX 3.4L All Windows VIN: 3G5DB03E84 Customer brought vehicle in with the complaint of intermittent window operation, we were able to get windows to fail all the time, pulled codes and found B1477 RAP relay control circuit low and B1507 Low voltage on control circuit, we performed test and pinpoi...	View
	1995 Cadillac Eldorado 4.6L Poor Idle Quality, High Idle VIN: 1G6EL12Y4S We replaced the IAC motor, no change. Start car, goes to 3500RPM, will go to 1000, but no lower. We took IAC off, can lower idle by hand. We also did an idle re-learn, no change!! HELP!! Trouble codes: 27 (Throttle Switch or Circuit Openhistory code), 52 (Defective ECMECU RAM Chip error history codde), 109 (Internal ECM Problem KAM Checksum history code)	View
	1996 Cadillac DeVille 4.6L MIL Lamp on VIN: 1G6KD52Y9T vehicle came in to shop running poor and ses light on, originally. 6 codes stored po171, po174, po131, po138, po151,p1139. fixed poor run with plugs, wires, and fuel filter and cleared codes. (hoped repair would eliminate some codes) vehicle returned with same... Trouble codes: P0131, P0138, P0151, P0171, P0174, P1139 (ho2s b-1 s-2 insufficient switching)	View
	1988 Chevrolet Corvette 35th Anniversary Edition 5.7L No Start VIN: 1G1YY3180J We have this corvette here that intermittently has no injector pulse. We have it narrowed down to a bad vats module. When it wont start we have no signal on the vats wire at the ecm. When it will start we have a perfect signal. My question is, how do you get t...	View
	1991 Chevrolet C1500 Cheyenne 5.7L charging gauge VIN: 2GTFC29K3M with the original alternator truck charges good 13.8 to 14.0 volts.only when u turn on blinkers or hazerd the charging needle in the cluster starts fluctuating and moving down at the speed of the turn flashes till it reaches 12 volts and stops charging. after ...	View
	1995 Chevrolet Camaro 3.4L Misfire VIN: 2G1FP22SXS GM Techs, Here is this camaro yet. Come in for misfire. Ran tests and found #1 Injector not flowing any fuel. Spark plug was fouled(black). Sandblasted spark plug to clean, had good compression(not running), has good spark. Replaced the fuel injector on #1 wit...	View
	1999 Chevrolet K2500 7.4L Poor Idle Quality, Misfire VIN: 1GCGK23JOX Hi Everyone and thanks in advance for the help. This truck came to us after the customer replaced the plugs and wires Due to a misfire.( He installed Bosch +4 plugs, I would have used Delco's) That did not fix the problem so now it's my problem. With 87k on th...	View
	1999 Chevrolet Venture 3.4L door locks VIN: 1GNDX03E4X The customer came in with this van and the the doors keep tring to unlock. I went out and the locks keep activating in the unlock mode about 4-5 times a minute and then they stopped, it sat here and about a half hour later it started doing it again. I did noti...	View
	2000 Chevrolet Suburban 1500 LT 5.3L Mechanical VIN: 3GNFK16T4Y NO COLD AIR IN FRONT!!COLD IN REAR. THIS VEHICLE WILL NOT BLOW COLD AIR IN THE FRONT OF VEHICLE, THE REAR A/C WORKS GOOD. THE PRESSURES ON THIS VEHICLE READ OK, WITH AN OCCASIONAL SURGE IN HIGH PRESSURE. THE VEHICLE HAS JUST HAD A NEW ACCUMULATOR AND THE BLEND...	View
	2001 Chevrolet Suburban 1500 LT 5.3L intrument cluster VIN: 1GNFK16T21 this truck came in customer states instrument panel lights dont work but sometimes she hits a bump and they flash on . Of course i thought short then i determined it was the gray wire into the ip cluster that has no power but the only info i have on this wire ...	View
	2005 Chevrolet Tahoe LS 5.3L abs VIN: 1GNEK13T15 good afternoon i have a 2005 tahoe 4wd here, the complaint is when you take off from a stop the traction light comes on and the truck will not accelerate for about 3 seconds. i checked for codes and there is none, hooked tech2 up to watch data and there is no...	View
	2006 Chevrolet HHR LT 2.4L MIL Lamp on VIN: 3GNDA23P36 I have this 2006 HHR here that is being a nightmare! It came in with codes P0121, P2176, P2135, and P2119. All for the two TP Sensors after testing the ckts and driving the vehicle trying to get it to act up we finaly replaced the throttle body with both the T... Trouble codes: P2135 (TP Sensor 1-2 Correlation)	View
	2007 Chevrolet Tahoe LTZ 5.3L rear glass VIN: 1GNFK13007 please help. problem is the the rear glass on the lift gate opens by its self when you operate the power lift gate open and close. it will mainly pop open when its closing. one time it popped open with just closing the driver door and once with inserting the k...	View
	2002 GMC Yukon Denali 6.0L secutity VIN: 1GKEK63U52 i know passlock problems are a crap shoot but i got extra info with this one. the MIL doesn't come on with the ignition. the complaint is the security kicks in occasionally leaving her stranded in 10 min intervals. BCM kicks a B2960 sig incorrect but valid, no...	View
	2001 Oldsmobile Aurora 3.5L Misfire, MIL Lamp on VIN: 1G3GR62H81 So this is the worst kind of problem you can have...one on your own car... I'm in the process of buying this Aurora from my mother in law, after telling my wife for the last year that we didn't want to touch it cause these things are problem pits! It set the m... Trouble codes: P0131, P0137, P0300	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1991 Buick Regal 3.8L Poor Idle Quality, Hesitation, Stall VIN: 2G4WD5417M The problem was in the computer connector, it was loose I tigh the connector and cleaned it. Thanks for your help everybody.	14
	1992 Cadillac DeVille 4.9L power falls off VIN: 1GC6CD5382 HI Guys, This one is on the road and doing good. I checked the cat and it was fine, so I hooked up a fuel gauge long enough to extend past the rear of the hood and lay over the driver's outside mirror and drove the thing. The pressure at cruise was about...	14
	1997 Cadillac Eldorado ETC 4.6L No Start VIN: 1G6ET129XV Thanks to the few people who responded. After much digging with the help of the alldata library, we found that the 55 volts at the climate control head was normal. This is a high voltage climate control circuit which originated from the cluster. With this clea...	3
	1997 Cadillac DeVille 4.6L MIL Lamp on VIN: 1G6KD54Y4V Thanks to all who have replied to my nightmare. Unfortunately customer has no more money for repairs. Poor individual bought a basket case vehicle that has been worked on by an individual who has no business working on or attempting repairs on anything, even a... Trouble codes: P1139 (ho2s insufficient switching bank 1 sensor 2 pre-converter), P1140 (ho2s transition time ratio bank 1 sensor 2 pre-converter), P1571 (traction control system pulse width modulated circuit no frequency), P1632 (theft deterrent system fuel disabled).	7
	2002 Cadillac Seville STS 4.6L abs tcs VIN: 1G6KY54912 Thanks so much guys the IGNITION SWITCH fixed it ,just goes to show check basics ,I should have checked positive while car was running ,we checked with connector at module disconnected .thanks again IATN ROCKS !!! Colin	3
	1995 Chevrolet K1500 5.0L clutch VIN: H3SE217790 THANKS FOR THE MANY RESPONSES. FOR A TIM [...] I THOUGHT I WAS THE ONLY TO HAVE SUCH LUCK PUTTING A CLUTCH IN AND NOT GETTING THE NEW CLUTCH TO WORK. I HAVE HAD OTHER CLUTCHES CAUSE BLEEING PROBLEMS THIS JUST WOULD NOT WORK. BUT THIS ONE JUST WOULD NOT WORK AFTER...	32
	1997 Chevrolet C1500 Cheyenne 5.7L MIL Lamp on VIN: 1GCEC19R3V i checked the maf meter.i found the screen in front of the sensors had come loose and turned 90 degrees so that the air flowed around the screen,not through it.i put the screen back the way it should be .now the maf grams per second went from 8.5 down to 7.5.t... Trouble codes: 172 (too richbank 1), 175 (too richbank 2).	11
	1999 Chevrolet K1500 LS 5.7L fuel VIN: 1GCEK19R8X after a trip to a buddy at dealership with tech 2 scan tool,we verified passlock module to be bad ,i replaced it relearn worked fine and everyones happy.thanks for yalls help	8
	2000 Chevrolet Silverado 1500 5.3L Poor Idle Quality, Misfire Thanks for all the help. The fix was a programming update. Had the programming done and let the customer drive the truck for a couple of weeks with no problem. the update was new calibration address hesitation, sag or stumble during light to moderate accelera...	19
	2002 Chevrolet Impala 3.4L carpeting thank you to all that sent me info. this car had several problems. the drain for the a/c was clogged. and also when the wind shield was replaced they did not seal the windshiled corrctly and it was allowing water to leak in . but again thank every one for thei...	12
	2004 Chevrolet Venture LS 3.4L water in floor VIN: 1GNDX03E94 we pulled the carpet up and drove it for several days and never could get it to give us any kind of water problem ? this one is really strange- well after several days and a 1/2 tank of customers fuel we put him in it for a few days and he did not have any pro...	17
	2005 Chevrolet Aveo LS 1.6L Poor Idle Quality, Stall VIN: KL1TD62685 Finally found the trouble. The yellow wire to the canister purge solenoid had broken, allowing the valve to stay open thus creating a vacuum leak, and creating the idle problem. Thanks to all who replied, especialy with the idle relearn idea, as I believe this...	9
	1992 Pontiac Bonneville SE 3.8L no spark VIN: 1G2HX53L8N Hello and thank you for the great replies. As most suggested the new module I had just installed was DEFECTIVE ... aarrgh! ... I kind of figured this would be the case since it went from no spark to 2 cylinders spark after replacing it the first time. Sure eno...	12
	2002 Pontiac Bonneville SE 3.8L Stall Hello I have fixed this vehicle. I replaced the battery which was original. It hasn't had a problem since. Thanks for all of the great information that all of you had. Jeff	20
	2000 Saturn LS2 3.0L service engine soon VIN: 1G8JW52R4Y Thanks to everyone who sent help on this problem, turns out the Massair sensor was the problem. The other repairs made during the trouble shooting were icing on the cake. The car runs great and shows 27mpg at 80mph with the A/C on, not bad! Thanks to all Gary Trouble codes: P0171 (lean bank one), P0174 (lean bank two).	7
	2001 Saturn SL1 1.9L engine VIN: 1G8ZH52811 intake gasket vacuum leak large enough to drop vacuum, fooling the ecm into thinking engine was under load, and the fuel trim correction was for a loaded condition that didn't exist. all replies suggested probs w the ect which i had experienced myself and app...	5

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