GM Automotive Technicians Technical Discussion and Fixes for Mar 27, 2012 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1994 Chevrolet K3500 Cheyenne 5.7L Drive-axles VIN: 1GCHK34K7R This truck runs down the road just fine until we shift into 4 wheel drive hi or lo. Then it goes through cycles acting like its running out of gas and snapping out of it, it will keep doing this until we put it back into 2 wheel drive. It has to be warmed up a...	View
	1996 Chevrolet Blazer 4.3L top end of engine VIN: 1GNDT13W2T The customer swears that the noise wasn't there before doing the intake. (I believe him, because I didn't hear it before either). I really don't want to tear this thing apart again but I guess that is my next step? Thanks in advance for any help.	View
	1996 Chevrolet Tahoe 5.7L Cuts out, Stall VIN: 3GNEK18R6T truck was at other shop started out as trans issue fluid very dirty and burnt smell to it as they were checking it out found that it would not down shift while trying to pass so turned into drive ability issue. would fall flat under hard acceleration. max rpm ...	View
	1998 Chevrolet K1500 Cheyenne 5.7L down shifting VIN: 2GCEK19R5W truck will not down shift from 65 unless up let up then its fine tested back pressure fuel pressure installed new tps sensor no help trans fluid smeels and looks fine Thanks for any help Scott	View
	2000 Chevrolet Impala 3.4L Battery drain Customer complains of dead battery after 3-4 days. Have checked for draw with all modules sleeping, can see all modules go down and draw go to 24 milli amps. Customer said the other day he got in and the car would not start but had dash lights, he unlocked the...	View
	2001 Chevrolet Impala 3.4L left headlamp VIN: 2G1WF55E41 Vec came in this am with left headlamp inop Went through the bulb deal was ok I have very little info on wiring digrams for this model only under hood No power at pink or blue wires at conector for lamp housing.Not sure on how relay controls left head lamp all...	View
	2002 Chevrolet Trailblazer LT 4.2L shift interlock hello all and thanks in advance, im posting for a co-worker of mine who's working on this trailblazer with a shifter interlock problem, the car originally came in and wouldnt shift out of park, checked wiring to interlock solenoid and power and ground was ther...	View
	2004 Chevrolet Silverado 2500 HD 6.6L No Start VIN: 1GCHK24234 Vehicle came in as a no-start. History: Hit pole with it. Body shop put in used tank and repaired body. Customer drove it home. Would not start in the morning. This is where I got it. Hook up tech 2, has very low pump pressure 700 psi. Hook up tool to check if...	View
	2004 Chevrolet C4500 Kodiak C4C042 6.6L lacks power VIN: 1GBE4C1214 hello gm techs, having trouble with this 6.6 duramax. came in originaly for cel coming on&off. scan codes had p0045,turbo boost control solenoid. performed test per identifix. saw solenoid was bad replaced & did t.c relearn per factory specs, noww has low powe... Trouble codes: U0106	View
	2005 Chevrolet Impala 3.4L engine VIN: 2G1WF52E95 when I start the car some times it will idle it self up to 2800-3000 rpm on its own. I checked for vacuum leaks found none, if I shut the car off and restart it then it idles fine. All the info in the scaner looks normal. I need help with this one.	View
	2005 Chevrolet Silverado 2500 HD 6.6L drivers front seal VIN: 1GCHK23285 General information question. I need to repace the drivers front axle seal and bearing in this truck. There are some special tools that mitchell says I need to do this. I can get the installers for the seal, bearing and bushing but the removal tool is on a 30 ...	View
	2006 Chevrolet Equinox LT 3.4L Air bags VIN: 2CNDL73F06 The first time it was in it had B0051 Deployment commanded, and B0102 incorrect EFS 1 installed. I told him he needs to replace the SDM, and see what that does for it. So he replaced the SDM with a used one, and the EFS with a GM one. I scanned it again, and i...	View
	2006 Chevrolet Cobalt SS 2.4L steering VIN: 1G1AM15B66 I'm am new with this steering not for sure what i'm into. the steering has got harder to steer. like I said dont even know where to begin. not like the standard with a p/s pump and resvoir. any help with where to even start	View
	1995 GMC Safari SLE 4.3L power window VIN: 1GKDM19W9S New customer so have never worked this vechicle before. Came in right window would not roll up or down. Took trim pad off, looks like someone already changed window motor. Tested the motor - works fine using jumper wires. They brought new switches for both sid...	View
	2007 GMC Yukon XL 1500 SLT 5.3L Misfire, MIL Lamp on VIN: 1GKSK163X7 i have known this vehicle since it was new fairly well maintained removed valve cover and the valves seem to be functioning properly Trouble codes: P0300, P0302, P0304	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	2009 Buick Enclave CXL 3.6L No Start, blows ecm1 fuse VIN: 5GAER23D99 George from Alabama The flasher and a bulb in the place of the fuse really helped to trace the three supply wires into the ECM and the three grounds out to various points of the vehicle that ran me down some interesting avenues. Thanks George! Dan from Texas I...	10
	2003 Cadillac DeVille 4.6L tcc code 741 VIN: 1G6KD54Y83 Prolem solved for G.M. po741 code from hell!! Parts replaced to fix 4T80E 03 Caddy Deville were both internal wire harnesses,torque conv. w/new G.M.Viscouse type,TCC Solenoid w/new G.M.,E.P.C.solenoid w/New G.M.,and channel plate gasket. Problem solved!!! Than...	10
	1996 Chevrolet Tahoe LS 5.7L Backfire when starti VIN: 1GNEK13R9T A big thank you to all that have replied. I suspected the distributor/ drive gear and most of you confirmed this. The vehicle left the area just after post and will not return for another couple of weeks at which time I will take a good look at distributor. A...	25
	1998 GMC Jimmy Envoy 4.3L No Start VIN: 1GKDT13W2W thanks the new pump was the problem. some of the aftermarket pumps just dont get it done	7
	2005 Hummer H2 6.0L Lock cylinder VIN: 5GRGN23U95 I'm saying yes I fixed it because I haven't been able to make it act up after I replaced the lock cylinder and after I replaced the battery cable bolts per a TSB that stated a no crank condition may be caused by improperly tightened battery cable bolts. I che...	12

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