GM Automotive Technicians Technical Discussion and Fixes for Dec 5, 2011 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1994 Cadillac Commercial Chassis 5.7L Cuts out VIN: 1G6DW52P7R 1994 Cadillac Brougham with the LT1- These have Traction control-- symptom came to me as "car bogs down when going on expressway" from the elderly owners. Disabled the TC with the glovebox switch, and problem goes away. This TC I believe, by design does not ki...	View
	2000 Chevrolet C3500 6.5L No Start VIN: 1GBKC34FXY Hi I don't usually work on diesels, this one belongs to a good customer. It was towed in, only pulled the one code. I can get a full data stream checked basics. Lots of fuel to pump none comming out at injector tubes. I ran through alldata no start tree and ca... Trouble codes: P0380	View
	2002 Chevrolet Silverado 2500 HD 6.6L MIL Lamp on VIN: 1GCHC231X2 I replaced the valve cover gaskets for a leak with no problems after firing it up and test driving the truck is very sluggish. It fires up good every time. Have gone over the job 3 times today and found nothing. I dont have the adapter for vacuum test will hav... Trouble codes: P1093, P1094	View
	2007 Chevrolet Silverado 2500 HD Classic LS 6.6L alternator VIN: 1GCHK23D47 I have a 2007 Chevy Silverado Classic and keep getting a p0621 code for battery not charging. Sets after about a minute of the engine idling. Voltaged dropped form battery to battery and from battery to alternator. tested the two wires that go to the alternato...	View
	2007 Chevrolet Equinox LS 3.4L MIL Lamp on VIN: 2CNDL13F97 This vehicle came in with a complaint for a mil and intermitent high idle. We pulled codes, found codes p0121 and p2135 stored in pcm memory. Proceeded to check throttle body with labscope (snap-on vantage) and confirmed that voltage at idle and wide open thro... Trouble codes: P0121 (Tp sensor or app sensor 1 problem), P2135 (Tp sensor 1-2 correlation)	View
	2008 Chevrolet Colorado WT 2.9L MIL Lamp on VIN: 1GCCS14998 The code usually sets on initial start-up. Initially the vehicle actually ran bad on stat-up. The freeze frame shows the code setting at idle. The code represents a crankshaft position -Exhaust camshaft position correlation. I checked for TSB but did not see a... Trouble codes: P0017 (Crankshaft position - exhaust camshaft position correlation)	View
	2009 Chevrolet Silverado 3500 HD WT 6.0L Speedometer VIN: 1GCHK73K19 Vehicle came in with Service 4x4 message and inop speedo. Has Tcase code C0569 System configuration error, calibration not learned. Sent to GM for module reprogram but did not help. Have good power and grounds into module as well as 8v for encoder motor and 5v...	View
	1994 GMC Safari SLX 4.3L No Start, Poor Idle Quality VIN: 1GDDL19W8R Let me preface this by saying that it may go bye-bye, so there might not be a fix. This "clean one owner" was towed in as a no start. It had a bad fuel pump, plugged solid fuel filter, and a melted down fuel pump relay and connector. All applicable parts were ...	View
	2009 GMC Yukon Hybrid 6.0L Brake Assist VIN: 1GKFC13569 I found a document in identifix that relates to this code setting after the vehicle has been in the key on engine off mode for an extended period. The identifix document number is 2463259. The instructions say to use a Tech 2 scan tool and relearn the EBCM. My...	View
	2001 Oldsmobile Aurora 4.0L Won'T Crank VIN: 1G3GS64C91 Complaint that the vehicle will start with remote but not with key. It will start every time with the remote feature. Once it arrived we started it several times with the key and the remote and called the owner to tell him so. Drove it back to the front of th...	View
	2004 Pontiac Grand Prix GT2 3.8L Starting VIN: 2G2WS52244 Have college kid's car. 4 times in last week would not crank over. When she puts key in car each time the dic displays: Key in ignition. Each time this happened the car did not crank. She waits 30 minutes each time & the car cranks right up. The key is NOT in ...	View
	2008 Pontiac Grand Prix GXP 5.3L Electronic VIN: 2G2WC55C28 ok guys i got one here its a 2008 Pontiac grand prix GXP and the trans slips intermittent and checking it out i got a list of codes for this one u0073 Control Module comm bus off co240 pcm traction cont not allowed po562 sys voltage low po572 cruise control/br...	View
	2006 Saturn Ion-2 2.2L ignition VIN: 1G8AJ55F16 This is a followup for the previous one which I had to close for lack of ability to update. The ignition switch did not cure the problem. TSB states that if the switch has been replaced that the BCM should be replaced. At 500 dollars, I hate to just throw this...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1969 Chevrolet Camaro SS 6.5L Poor Idle Quality ok so as I said before the first thing I did was to ensure that the crank pully timing mark was correct and it was i was shocked to see that the crank and cam timming marks were correct. so i pulled the cam and found 2 numbers and a clay smith stamp on the cam...	55
	2003 Chevrolet C4500 Kodiak C4C042 6.6L No Start, Hesitation, Stall VIN: 1GBE4E11X3 Well after finding how to find out the injector that was bad replaced with new injector and new pump vehicle was fixed and ran great Thanks to Martin [...] figured out how to diagnosis properly plus everyone that helped had me on the right track. Thanks Again	9
	1997 GMC Yukon SL 5.7L pedal VIN: 3GKEK18R4V Thanks to all that have replied. What I ended up doing was several things. I tightened up the rear shoes,did not help I plugged the outlet of the master cylinder for the front brakes. The pedal was solid. I then plugged each outlet of bpmv. I found that the ri...	12
	2001 Pontiac Firebird Trans Am 5.7L security light VIN: 2GZFV22G91 I hate to do this but customer has decided to not chase this problem any further. I really appreciate the help that was offered especially the explaination from Rex on how the system operates. I am confident that we could have repaired this for him but I am no...	6
	2003 Saturn L300 3.0L ABS controller VIN: 1G8JW54R13 well, got a used ABS unit, bled it out, system funtions perfectly, but still the ABS light. it has NO codes in any vehicle systems.. further investigation, found instrument cluster software dated to 2001, and the part# shown in scanner, fits a 2000,-2002, mode...	6
	2006 Saturn Ion-2 2.2L ignition VIN: 1G8AJ55F16 For some reason I'm having a hard time finding out how to update this again without closing it, so i guess we're closing it without a fix. After replacing the ignition switch last week Friday, this morning Monday it wouldn't start. Same deal, security light ...	11

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