GM Automotive Technicians Technical Discussion and Fixes for Jul 27, 2010 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	2005 Cadillac CTS 3.6L Misfire, MIL Lamp on VIN: 1G6DP56745 This Caddy runs on 3 cylinders. Numbers 1,3,and 5 are always missing. I checked the database and found a few of these cars with pugged cats, so I pulled the primary o2 sensor on bank #1 - no change. I suspect this camshaft actuator has all the intake valves ti... Trouble codes: P1011 (Intake Cam Actuator park Position Bank 1), P1013 (Intake Cam Actuator Park Position Bank 2), P0300 (Misfire Detected), P0301 (1 Cyl Misfire), P0303 (3 Cyl Misfire), P0305 (5 Cyl Misfire)	View
	2002 Chevrolet Silverado 2500 HD 6.0L chassis VIN: 1GCHK29U02 This Vehicle has a vibration that is felt in the floor and through the seats. The center console shakes so bad at time you cannot set a pen on it without it getting tossed off. The u-joints were replaced by another technician who has since left us so it fell i...	View
	2002 Chevrolet Corvette Z06 5.7L System control VIN: 1G1YY12S52 Customer says A/C is inop. Verifyed no compressor operation. Checked for a charge, plenty there. Checked relay and fuse, found relay missing. Swapped out another and compressor engages, cooling fans come on, low side pipe cold. No inside blower operation. Insp...	View
	2004 Chevrolet C5500 Kodiak C5E042 6.6L Excessive Emissions, Stall, Poor Fuel Economy VIN: 1GBE5C1214 I have a upset cust. he spent all his money and truck runs worse than it did. The complaint is excessive black smoke on take off,hard start or start then stall,and no low end power. Cust. stated that he was having to change the fuel filters around 3500 to 4000... Trouble codes: P1093	View
	2004 Chevrolet Avalanche 1500 5.3L key, starter VIN: 3GNEK12T14 Hello all and thanx in advance. Ford guy here trying to work on a Chev, started out with long crank and replaced fuel pump to correct. Now has intermmitant cranking after releasing the key. GM has a tsb that says this is normal when there is a long crank, but ...	View
	2006 Chevrolet Cobalt LS 2.2L 1-2 Shift VIN: 1G1AK55F06 Test drive car to verify complaint and tranny does shift rough on a 1-2 upshift on easy or hard acceleration.pulled codes and did not have any tranny codes stored.did have 3 codes stored in engine module. The codes pointed to a low fuel pressure condition.chec...	View
	2006 Chevrolet Silverado 1500 LT 4.8L Hesitation, Surge, Poor Fuel Economy VIN: 2GCEK13V96 Thank you in advance for all your help, this truck lacks accelration at all times.truck does not bogg down just very flat power range.no codes found in any system,cats have been droped with no change,fuel pressure 60psi with great flow,no misfires,just acts l...	View
	2001 GMC Yukon XL 1500 SLT 5.3L Compressor clutch VIN: 1GKFK16T91 Hi techs, trcuk came in w/no A/C.(clutch not engaging) checked system charge, looks good. indicator light for A/C lights up, but when scanner is hooked up it shows A/C not requested. also shows high pressure switch open. jumped plug @ high pressure switch & no...	View
	2002 GMC Envoy SLE 4.2L Noise VIN: 1GKDT13SX2 strangest thing i have heard ... at 80 kms with the rear side door windows down it starts a pulsing vibration that hurts your ears its like having your head inside a bass drumm ..close the windows and the noise and the vibration goes away .. you can actually s...	View
	2004 GMC Yukon Denali 6.0L MIL Lamp on VIN: 1GKEK13T84 Thanks in advance . This truck came in with a complaint of 4wd malfuction on drivers information coming on intermittantly. Scanned computer and code p2771 present. I did notice that it will shift into 4 high but not low. Any help would be appriciated . Mike P	View
	2005 Pontiac Vibe 1.8L MIL Lamp on, Hard shifting VIN: 5Y2SL63815 Did my testing and found pressure control solenoid was within spec. 5.1 - 5.5 ohms. Diagnostic sheet say replace computer but i feel it is still a guess. Was looking for some more input before i through a computer at it Trouble codes: P2716 (Transmission line pressure solenoid open/shorted)	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1998 Buick LeSabre Custom 3.8L Alignment VIN: 00WH451071 i had a chance to look at this car more closely after all the help i really appreciate all the people who chimed in thanx, the verdict is the strut bearing seizing i look at the rack mount all was fine no loose bolts no worn bushing took the car down the road ...	53
	1992 Cadillac Seville 4.9L Poor Fuel Economy, MIL Lamp on VIN: 1G6KS53B0N The vehicle is fixed and down the road, no complaints from customer, engine lamp coming on was his only real issue in his opinion. The ECM did turn out to be bad, however the BARO/MAP issue was not resolved by the new ECM. Even with the BARO reading very clo... Trouble codes: E039 (TCC problem), 1033, 1034, 1037, 1039, 1042.	6
	1996 Chevrolet Blazer 4.3L Hesitation, Cuts out VIN: 1GKDT13W7T Thanks for all the replies. As always many good tips. First, I had already unplugged MAF and had no change in performance. Next I got enough adjustment out of dist to get cam tretard down to 7 deg, no change. Pulled MAP and inspected, clean port. Verified MA...	18
	1997 Chevrolet Tahoe 5.7L compressor VIN: 3GNEK18R7V ok this is fixed, it was the ignition switch. told customer what it was going to cost and he damn near had a stroke, i can't believe what this switch cost,and the labor to replace it.anyway thanks everybody for the help on this.	9
	2000 Chevrolet Silverado 1500 4.3L Instrument Cluster VIN: 1GCEC14W5Y Thanx again for the replies. Veh is owned by a wrecking yard and he did not want to go any further, i still think prblem was in cluster, but we may never know... If I hear from him i will re-post thank you Kevin	2
	2000 Chevrolet Silverado 1500 4.3L Instrument Cluster VIN: 1GCEC14W5Y Thanx again for the replies.. Looks like I posted thi twice.. OOPS.. Veh is owned by a wrecking yard and he does not want to go any further... If he ever does i will repost thankyou for your time. Kevin	3
	2001 Chevrolet Silverado 1500 5.3L abs VIN: 2GCEK19T01 Thanks everyone for your help. We were finally able to catch this thing acting up in a recording and realized that one of our new hubs was still dropping out at low speed. We re-replaced both front hubs again and everything has been ok for a couple of weeks ...	9
	2002 Chevrolet Express 3500 5.7L No Start VIN: 1GCHG35R82 We finally got the vehicle to stay in a no run condition long enough to get some more symptoms, like loosing communication with the ECM. We went to the powers and grounds on the ecm, and found a bad ground that Mitchell said was at the t/stat housing. When we ...	10
	2004 Chevrolet Silverado 2500 HD 6.0L MIL Lamp on VIN: 1GCHK29U44 I am still working on vehichle off and on. First reply thought I was talking about tachometer. Second reply had some usefull information and is helping me. Thank You Trouble codes: P1125.	2
	2000 GMC Yukon Denali 5.7L Starting VIN: 1GKEK63R3Y we did a lot of stuff on this. Fix was ignition housing and lock cyl.thank you for the help.	5
	1998 Pontiac Grand Prix GT 3.8L Poor Idle Quality, Stall VIN: 1G2WP52KKO flashed ecu that cured black smoke while hot start up,still no idle hot,customer took car for a while to give us a break.no fuel leaks,no coolant leaks,no codes,like iac willnot idle warm?thanks	23
	2000 Pontiac Bonneville SE 3.8L security system VIN: 1G2HX54K6Y I would like to thank the techs that took the time to reply to my help request. It was indeed the Vehicle Theft Deterrent Controller Module causing the draw and the cranking issue. The module is on the left side of the heat / ac control, tucked behind the l...	11
	2001 Pontiac Grand Am SE1 2.4L No Start VIN: 1G2NE52TX1 Hi All Thanks for the 9 replies. A few said I did not have to do a relearn. But after changing the switch the security light was still flashing. Did a 10 minute relearn and vechicle started right up. tried it several times durring the day and all is well Than...	10
	2000 Saturn LS1 2.2L ket not turn VIN: 1G8JU52F0Y i drilled out ignition tumblers. what a pain.i also got a new ignition housing thats were the problem was seized up .thanks all for the help	4

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