GM Automotive Technicians Technical Discussion and Fixes for Apr 28, 2011 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	2003 Cadillac CTS 3.2L transmission VIN: 1G6DM57N13 im trying to find documentation on the last 3 codes found on my snap on verus updated to 11.2 according to our repair program (mitchell) we need to diagnose the other codes first before starting on the 1719, which starts to condemn the trans control module. ha...	View
	1994 Chevrolet C2500 5.7L Oil/temp/voltage/tach gauges VIN: 2GCFK29K3R All the gauges read low. I have replaced ALL grounds. I am wonderng if the alternator only charging 12.3 volts at an idle will effect all the gauges and make read low as well. any inciste will be greaty appreciated, going to replace alternator today. Thank y...	View
	1994 Chevrolet K2500 Suburban 7.4L Excessive Emissions VIN: 1GNGK26N2R Hi , my name is andrew, thank you to all who take the time to read this , my issue is a nox failure for an enhanced smog inspection in the stat of california, after all my testing and research , i feel that more e g r is required to reduce nox, im getting 11% ...	View
	1997 Chevrolet C1500 Silverado 5.7L no crank VIN: 2GTEK19R4V well here we go , truck came in to us locked up engine, we replaced complete engine went to start vech no crank!!turn switch lights dim no crank.pull replay jumper replay starts right up runs perfect.let run everthing looks good take on test drive trans shifts...	View
	1998 Chevrolet C1500 Suburban 5.7L Starting VIN: 1GKFK16RSX Helo all got a weard one hear 1998 chevy suburban 4x4 instaled new crate motor went to start and has arealy hard start and a backlash wen cranking but once started runs great shut it off go to start it again hard hard hard start get started runs great changed ...	View
	2000 Chevrolet Tracker 2.0L Input Speed Sensor VIN: 2CNBJ13C4Y Vehicle came in with SEL light on code P0715 transmission input speed sensor-Alldata has no information so working with diagnostics for Suzuki Vitara-intermittent problem and connectors look good-bit the bullet and bought the $200 sensor-worked for a day and l...	View
	2005 Chevrolet Uplander 3.5L rear suspension VIN: 1GNDV23165 GOOD EVENING ALL This uplander has a thumping noise in rear suspension,you can hear it more going over railroad tracks.It almost sounds like spare tire rattling but its not.Replaced rear shocks, checked bushings in trailing arms seem ok.This is a front wheel d...	View
	2005 Chevrolet Express 2500 4.8L Temperature gage VIN: 1GCGG25V75 when I start the van the temp gage works then in a matter of seconds it will drop down to like it dont work the ect says 196 but the icp says monitored temp 99 and so displayed is 99 so the gage seems to be working it will sweep and during the sweep it reads c...	View
	2007 Chevrolet Silverado 2500 HD Classic LS 6.0L trans fluid VIN: 1GCHC24U87 The trans temp climbed to the red on the gauge and dash indicated trans overheating. Changed the fluid nothing unusual in the pan. Test drove truck no problems at all driving other than the temp climbing, verified gauge w/scan tool. Removed both lines from the...	View
	2001 GMC Sonoma SL 4.3L Misfire, MIL Lamp on, No misfire felt VIN: 1GTDT13W91 Runs great at 2500 to 3000 rpm ses light flashes i dont feel a engine miss at idle light goes out and the engine idles smoothly Trouble codes: P0300 (Random misfire)	View
	1997 Pontiac Sunfire SE 2.2L No Start VIN: 1G2JB5244V we had it towed in and found straightoff that timing chain wneeded to be replaced. I assume that is why is running bad to begin with at 1st facility. we replaced timing chain and car would not start. does not have spark or injector pulse. We have checked for c...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1994 Buick Century Custom 3.1L Hesitation, Low Power VIN: 1G4AG55MXR The customer has declined to do any further investigating for the cause of the noise that the knock sensor was reacting to. But starting it one morning it had a terrible valve train noise like a collapsed lifter. That still doesn’t explain the tinking noise ...	25
	2001 Buick Century Custom 3.1L Radio VIN: 2G4YS5J311 Fixed, thanks again to the members of iatn. I took some information from everyone and did some research. The 1-800# is the way to go but you need an account number. I found them out there on the web in the procedure I listed below. Thanks for all of the help...	11
	1994 Cadillac Seville SLS 4.6L No Start, Poor Idle Quality, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1G6KS52Y3R Well the caddy is alive. Thanks to all that helped. The fix was more than one. I found additional grounds on rear of engine above tranny not connected. The suggestion about ckp wires routed behind dipstick turned out to good tip. One of the ckp A wires was bro... Trouble codes: 80 (Rich or tps learn).	9
	1998 Cadillac DeVille 4.6L transmisison VIN: 1G6KD54Y8W Well as many of you thought it was the wrong transmission. The final drive gear ratio was incorrect. I removed the final drive from the old transmission and installed it into the new transmission and the PCM is now happy. As a side note if you have a second g...	8
	1999 Cadillac Seville STS 4.6L Cuts out, Stall VIN: 1G6KY5496X well, first let me apologize for the late reply, since it was my writers car it got put on the back burner. First thing I did was double check a couple of the main grounds, they looked ok and were tight. I then went to the positive cable connections, specifica...	26
	1998 Chevrolet Cavalier 2.2L Transmission VIN: 1G1JC5249W overfilled trans still neturals out on turns,installed manual gauge when trans concern happens pc amps low. line press is 20 psi. advised cuctomer of trans r& r. declined repair. thanks to the nine replies	9
	2004 Chevrolet Tahoe LS 5.3L reverse VIN: 1GNEK45ZT4 I may not have the exact fix on this one. My rebuilder told me he replaced torque converter and all is good. I don't believe it. He said that is all it was. I think he was covering his ass because we are a 20k a week shop and he didn't want to be traded out. T...	15
	1995 GMC Sonoma SL 4.3L Poor Idle Quality, MIL Lamp on, Runs very rough VIN: 1GTCS19Z4S Thanks to all that replied. It was Don [...] who got it right. The EGR valve was stuck so far open, I couldn't even see the pintle. We replaced the EGR and set timing again and it would run great cold. Once it w... Trouble codes: 43 (Esc module).	15
	2002 GMC Sierra 1500 5.3L interior electrical VIN: 1GTGK13U82 Customer had said smoke was rolling out of dash - pulled dash completely appart and found nothing Inspected seat motors drivers side and didn't realize that there was and electric seat on passanger side The motor on passanger side seat had shorted out - no f...	7
	2002 GMC Yukon Denali 6.0L No audio VIN: 1GKEK13Z02 Found the problem, wiring diagrams in alldata and from GM website were very sketchy to say the least. Found this system did have an amp and that was the problem. Thanks again	4
	2006 Saturn Ion-2 2.2L radio VIN: 1G8AL55F26 Hi everybody! I would like to thank all that responded to my radio problem. I did try disconnecting the battery terminals and touching them together with no results. I talked to the locale GM dealer and he said they can send the radio out and have it repaired....	7

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