GM Automotive Technicians Technical Discussion and Fixes for Jun 15, 2010 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1999 Buick Park Avenue Ultra 3.8L security light VIN: 1G4CU5219X We have a Buick Park Ave Ultra that has a security light on driving or just key in run. Also intermittently the first time you hit the key you get a no crank, but if you release the key and try again it will start. The pinpoint test for SECURITY LIGHT ALWAYS O...	View
	1994 Chevrolet Caprice Classic 5.7L speedo and odometer VIN: 1G1BL52P9R This is for all the gm tech's. I have an old police car our customer bought some time back with problems with the cluster. The cluster has a digital speedo,odometer and trip meter. The speedo and odometer goes blank. We had this cluster out for repair three ti...	View
	1996 Chevrolet K3500 Silverado 6.5L Unknown VIN: 1GCHK33F0T Customer brought truck in with complaint of intermittent brake grab. We test drove vehicle and confirmed complaint. We also noticed that the front brakes would stick on after brake pedal was released and the brake pedal was slow to return to the top. The more ...	View
	1996 Chevrolet K1500 Suburban 5.7L front differential VIN: 3GNFK16R0T This vehicle is making a gear grinding or ratcheting noise from front differential only after vehicle has sat and is cold, it makes the noise only when first taking off from a dead stop in the parcking lot. The noise is coming from the front diff. it only last...	View
	1998 Chevrolet Venture 3.4L Poor Idle Quality, Surge, Stall, Poor Fuel Economy VIN: 1GNDX03E1W veh runs great,cold start noticed idle is not hi like used to be,just made 500 miles on non stop on hiway,when coming to stop engine dies way before stop sign,starts up,no long crank,jerks a few times ,takes off w/o any power problem.when it does idle,idle is ...	View
	1999 Chevrolet S10 2.2L Accessories VIN: 4678235564 ok truck came in with gas light on ,battery light on,gas gauge,temperature gauge not working.battery is charging 14 volts,had replaced alternator same thing,it shows gauge in dash charging checked wire to alternator it has 4.5 volts on it.we replaced pcm and c...	View
	2004 Chevrolet Silverado 2500 HD 6.0L oil prssor VIN: 1GCGC23U84 custmer call in having low oil pressor after he heard loud noise & lost pressor .we replaced oil pump & tub o ring with no luck .pleas if any one know whats going on.thanks	View
	2004 Chevrolet Silverado 1500 5.3L Mechanical VIN: 1GCEK19T14 Hello Techs, This truck has a whirring noise, remove drive belts no change. we have replaced timing chain and oil pump and the noise isn't any better. Any thoughts? One of my techs also describes the noise as a constant tinny knock, almost like a broke flex pl...	View
	2006 Chevrolet workhose 6.0L brakes VIN: 5B4JPD2V66 hi guys I got involve in this workhorse that I know nothing about & had no scannr to check first the abs lamp is on & brake pdal goes to th floor bleed systemseveral times got good pressure at al wheels . my question is is this car has a funtion with scannr to...	View
	2007 Chevrolet Equinox LS 3.4L charging system VIN: 2CNDL13F87 customer complained about noise. Checked and found bad alt. bearing. Took alternator to local alternator shop and they replaced a bad bearing in the alternator. Reinstalled alt to now have trouble code Po621. sent alt back to have it tested and came back good....	View
	1998 Pontiac Trans Sport Montana 3.4L pressure/return lines VIN: 1GMDX03EXW Gentleman I have this Montana from another shop which they have worked on for over a week. When the a/c runs the compressor will not cycle and the lines start to freeze up. It came to their shop for a bad compressor which they replaced along with a dryer, two...	View
	2002 Pontiac Grand Am SE 2.2L No Start VIN: 1G2NF12F72 Only fault I could find was the bad crimps/connections where aftermarket electronics were installed then removed. I removed bad repairs and soldered all repairs correctly. when I found issue happening it had all inputs EXCEPT cranking pulse width on scanner da...	View
	2007 Pontiac G6 3.5L MIL Lamp on, reduced engine power VIN: 1G2ZG58N07 This ones for the GM guys. Had a 2007 G6 come in with CEL on and reduced engine power displayed on the radio. Pulled a P2138 and per test flow chart replaced the pedal assembly. Two days later the vehicle is back with the same code. The customer said that aft... Trouble codes: P2138	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1995 Chevrolet Corvette 5.7L key fob VIN: 1G1YY22P9S customers son removed the battery from the key fob thanks evryone	5
	1997 Chevrolet Tahoe 5.7L Unknown VIN: 1GNEK13R8V Thank you to all a few nailed it when they said bad rebuilt transmission. I drove the truck back to the rebuilder and he put another rebuilt trany in it. I drove it back two days later with the newer rebuilt chattering on highway speeds. They took that one ou...	5
	2001 Chevrolet Silverado 2500 HD 8.1L No Start VIN: 1GCHK29G41 Thanks for the replies. Most sugested BCM. I felt that it was an ignition issue and Joe and Matt made sugestions that way also. I finaly got the OK to replace the ignition switch. In the archives it looks like the key & tumbler and the housing fix alot of thes... Trouble codes: B2960, P1631 (Theft det start enable signal not correct), U1064 (u1024-), U1024.	7
	2004 Chevrolet Malibu Maxx LT 3.5L Alternator VIN: 1G1ZU64824 Sucess!! we fixed this with a new ignition coil and ground strap through a tsb from GM. it took a lot of checking and I still have yet to find the correct wiring diagram for this alternator. Thanks for all the Help. but no more light or spikes.	12
	2007 Chevrolet Malibu LS 2.2L Starter VIN: 1G1ZS58F67 Tested all the wires, ends & sensors that were related to code P1516. could not find anything wrong. Cleared code and it never came back. Car still had a intermittent no start no crank. tested all circuits in under hood fuse & relay box. Heat seemed to affect...	12
	2005 GMC Savana 1500 4.3L Poor Idle Quality, Cuts out VIN: 1GTEC14X85 Well we went ahead and ground down the flat spots on the hold down. Turned on distributor and our -7 never moved. Yes, even after reving over 1500, restarting, clearing code. Did alot of talking to gm dealers around our area, and low and behold found our pr... Trouble codes: P0341.	15
	1997 Pontiac Sunfire SE 2.2L MIL Lamp on VIN: 1G2JB5245V Well the bulk of the replies were leaning toward a valve train problem. We went as far as swaping valve springs and the problem didn't change. The customer doesn't want to take the cylinder head off of the car so we may never know. Thanks to all , MIcK Trouble codes: P0302 (Misfire cyl 2).	18
	2001 Pontiac Grand Am GT 3.4L lacks power VIN: 1G2NW52EO1 we had to wait for customer to bring back the 01 grand am for further diagnostics. we just got the car back and have found that the timing would not advance. BY watching the scan tool we could see the timing actualy would go down to 0 deg advanced, when you gi...	23

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