GM Automotive Technicians Technical Discussion and Fixes for Oct 22, 2012 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	2001 Buick Century Custom 3.1L Shift Indicator VIN: 2G4WS52J41 So we have this 2001 century with a shift indicator that will not indicate what gear you are in, the display lights up normally but will not show what gear you are in. With my solus scanner hooked up it will show the correct gear on the scanner, but not on the...	View
	1968 Chevrolet Chevelle Malibu 5.3L Wiper Motor VIN: 11327W4568 Trying to hook up wiper motor on this car. Has a 3 prong switch. No factory conectors. I am sure I got the wires routed right but I cant get to work. Does anyone know how to replace motor? New motor comes with two wires not hooked up. I am having hard time on ...	View
	1999 Chevrolet Silverado 1500 5.3L ABS pump VIN: 2GCEK19T4X Vehicle arrived with ABS pump running constant. Owner had been removing the fuse to stop the pump so the battery would not run down. Connected scanner into ABS system. Shows pump is off even though it is running constant. I believe it to be a bad EBCM. Found a...	View
	2000 Chevrolet Blazer LS 4.3L no 4wd low range VIN: 1GNDT13W7Y Hi There i have a fault with the Autotrac system in that it does not engage 4wd low or Transfer case neutral. also the dash display does not show all of the gear lever positions ie PRND2L only shows R D L we have a donor vehicle which is the same and have sub...	View
	2002 Chevrolet C7500 Kodiak C7H042 7.2L alt, tach VIN: 1GBM7H1C32 Truck came in not charging. Replaced alt and it was good for 10 days. Cust said the ABS light would come on and the charging gauge would peg at 19v. When the ABS light went out the gauge would go back down. The batt light never came on. Truck died and was towe...	View
	2002 Chevrolet Malibu 3.1L ignition control module VIN: 1G1ND52J12 customer drove car home from work, parked in the garage. next morning car would not start. found no spark coming from icm, swapped out with good known icm and coils still no spark. removed and replaced all cam and crank sensors at cust. demand, still no spark....	View
	2002 Chevrolet Tahoe LS 5.3L Unknown VIN: 1GNEC13T22 this car came in wt a long crank, we checked the fuel pressure regulator and it was leaking. Replace it wt a acdelco one, long crank is fixed but now the regulator is making a funny noise,we replaced it again but the noise in the regulator is still there,i've ...	View
	2005 Chevrolet Colorado Z85 2.8L Misfire VIN: 1GCCS14855 seems to miss only at idle,none detected past 1200 rpm. Same warm or cold Trouble codes: P0303	View
	1996 Geo Tracker 1.6L clutch release VIN: 2CNBJ1361T Hi techs, This 96 tracker is used 4 to 6 hours a day to deliver news papers rural route. After about one week the clutch starts not to release and free play increases. can adjust back to normal operation than it repeats agian. we have looked at the pedal assem...	View
	1993 GMC Yukon 5.7L driveline VIN: 1GKEK18K8P this yukon came in with a clunk/slip noise when in 4x4.I have replaced rubber mounts @ frame and crossmember.Ireplaced brokem output shaft snap ring t-case and range fork.Front axle has been disassembled and had bearings replaced.checked splines in front drive...	View
	1993 GMC K1500 Sierra SLE 5.7L MIL Lamp on, won't shift VIN: 2GTEK19K7P Trying to fix this old truck. I don't have a scanner for this truck but did get codes 24 & 43(which I think is irrelevant). VSS seems to be good, wiring from the sensor to the VSS buffer is good. B+ & B- are both at the buffer and good. Now I read that if I ta... Trouble codes: 24 (no speed from VSS), 43 (esc)	View
	2007 GMC Yukon SLT 5.3L remote start and door locks VIN: 1GKFK13077 Vehicle can be locked using the key fob. Door locks and remote start are inoperative with key fob. If you unlock the drivers door with the key, the key fob will work correctly untill vehicle sits locked for more than 10 minutes. Found 2 body control codes B320...	View
	1996 Oldsmobile Silhouette 3.4L heater core VIN: 1GHDU06EXT If you remember on these engines they have that little bleeder pipe that has the heater hose coming off it back to the heater core. Every hose, is around 180 degrees except for this hose. Right at the point where it meets the pipe it is 180 degrees. The furthe...	View
	1993 Pontiac Firebird Formula 5.7L Hesitation VIN: 2G2FV22PXP I have this firebird in here with a loss of power when taking off and feels really sluggish. wide open throttle is ok, it seems like idle vac a little low for sea level, but idles fine. To me it acts like the timing is retarded, this engine has opti spark and ...	View
	1995 Pontiac Trans Sport 3.8L Poor Idle Quality, Surge, Stall, MIL Lamp on VIN: 1GMDU06LBS Thanks in advanced for your help. we are mainly a European shop but this minivan belongs to a really good client of ours. Here's the story, this transport runs very rich at idle when hot and at start up. At the same time that is runs rich, it also surges at id... Trouble codes: P0172 (Fuel Trim Rich)	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	2003 Cadillac CTS 3.2L timing belt VIN: 1G6DM57N33 well found the problem guess i cracked the key way in the crank gear takeing the crank bolt out .and when i put back must of finshed it off. causeing the timing to go out .most likely bent the valves . thank you for the help.	14
	2006 Chevrolet Impala LS 3.5L No Start VIN: 2G1WB58K46 Thank all who replied. As some of you said, change the BCM. We did and it corrected the problem. Sorry for the delay, the customer had to wait for funds. Thanks again. Trouble codes: U0140.	12
	2006 Chevrolet Uplander LS 3.5L No turn signals VIN: 1GNDV23L86 I am closing this because the customer declined further inspection/repairs. They will be getting rid of the van, to many issues. Robert the van does not have a trailer harness. Alex [...] have heard of the harness issues before and im sure that is part of the ABS ...	4
	2000 Oldsmobile Silhouette Premiere 3.4L MIL Lamp on VIN: 1GHDX13E2Y This one is fixed, although Im still at a loss as to the data I was getting. The fix was the O2 sensor. Several people suggested it, and after spending more time with it, I agreed. However, I wasnt certain until I put one in, and I hate guessing. In this case,... Trouble codes: P0137 (Post cat o2 signal low).	7
	2003 Pontiac Bonneville SE 3.8L Cooling Systems VIN: 1G2HX52K53 William [...] may be right! I have replaced many many of these elbos and never had a problem... These parts came off a help rack at AZ.. I have explained this to my customer about begin bad parts ima kind from the show me state i picked up some diff ones at...	20
	1998 Saturn SL2 1.9L vent tube VIN: 1G8ZK5278W Well it's been quite a few weeks since the last time we cleared the drain. I have not heard back from the customer but it hasn't been hot or humid. Thanks for all the replies but I just don't think there was any debris in there. Maybe next summer we will fi...	5

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