GM Automotive Technicians Technical Discussion and Fixes for Sep 21, 2010

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Open Help Requests for GM

	Help Request	Answers
	2002 Buick Rendezvous CX 3.4L differential VIN: 3G5DB03E82 This rendezvous has the AWD disable message displayed. i have scanned for codes none found .Monitored all abs wheel speed sensors ,all reading correctly. All tires are the same size and properley inflated. Im not sure what to look for or how to clear the light...	View
	1994 Cadillac DeVille 4.9L Evaperator VIN: 1G6KD52B9S Car came in with this concern. The low pressure cycling switch was replaced but after road test evap still freezing up. The o tube was removed and check but nothing found but was replaced. Reroad tested still freezing up. The low side temp sensor was off by 5 ...	View
	2005 Cadillac Escalade ESV 6.0L ride control VIN: 3GYFK66N35 This is my wife's truck. The, "Service ride control" light is on. I have a Tech II scanner but the truck will not communicate with the electronic suspension control (ESC). I checked the three fuses that it shows in the wiring diagram, they are O.K.. The air sh...	View
	2007 Cadillac Escalade 6.2L Electronic VIN: 1GYFK63807 I need help with the climate controled seats the driver and passenger seats dont work at all I couldnt find any help with alldata the lights come on in console and I hear the reley click in controll module under passenger seat but no heat or fans on the seats	View
	1993 Chevrolet Lumina APV 3.8L Computer VIN: 1GNDU06L3R Codes are p1640 and p1670 quad driver we have checked wiring harness, solonoids, grounds, wiring connectors, bulkhead connectors and have tried another ecm. Engine runs good but immediately resets codes on start up.	View
	1997 Chevrolet S10 2.2L No Start VIN: 1GCCS1944V Trying to perform a fuel pressure test on this truck, but can't find a service port - am I blind?	View
	1998 Chevrolet C2500 Silverado 5.7L 6,8,5,7 cylinders VIN: 1GCGC24RWE vehicle is missing on both rear cylinders on both sides of the engine. cylinders 5-7 6-8 are dead. we have fuel compression and spark is good. rear half of engine not working. im thinking we have a crack in the lower intake ???	View
	1999 Chevrolet C1500 Suburban 5.7L brakes VIN: 1GNFK16R7X When coming to a stop at about 8 mph there is a thump noise and the brake pedal drops about a quater inch. Does it in manual low so it is not a downshift concern. Does not happen in reverse or neutral only when in a forward gear. Thanks for the help.	View
	2001 Chevrolet Silverado 1500 4.8L transfercase VIN: 2GCEK19V11 c0308 i found the 20amp on the elec motor on transfercase disconect the conector and start to run but the probleme come back again when the probleme is on the 4x4 switch is not illuminated and not fonctional thanks to all and sorry for my bad english	View
	2004 Chevrolet Monte Carlo LS 3.4L Ignition Switch Hello techs im not sure where to post this so i am putting it here. Here is my problem.2004 monte,carlo,intermittent malfunction.customer describes as follows. Driving car,lights on dash will cycle as if car was shut off and normal starting was happening,ie ...	View
	2004 Chevrolet Optra LS 2.0L MIL Lamp on VIN: KL1JK52Z64 This vehicle came in with a P0300 stored in memory. computer data is normal with good fuel trims and no noticeable symptoms.No miss fire detected at anytime during testing.Vehicle is in good state of tune with recent spark plugs,and filter.No other codes store... Trouble codes: P0300 (random missfire detected)	View
	2005 Chevrolet Equinox LS 3.4L Starting VIN: 2CNDL13F05 Hello all, I've got a chevy equinox here that was towed in for a dead battery. The owner attempted to jump and I can only assume he hooked the cables up backwards. When we put a new battery in it the cooling fan came on right away, bingo that is why the batter...	View
	2005 Chevrolet Impala 3.8L No Start VIN: 2G1WF52KS5 Thanks for the help in advance. This car came to us as a crank no start. Found no spark...scoped 3X and 18X crank sensors...both good. Scoped cam sensor signal...good. Checked power and grounds at ignition module. We then replaced ignition module twice..still ... Trouble codes: B2964 (Key in Ignition Circuit High)	View
	2006 Chevrolet Uplander LS 3.5L No Start, Stall VIN: 1GNDV23L86 This vehicle will start and run then die and not crank. Let it sit a few minutes and it will restart. When it dies it sets P0601, P0606 and U0107. Engine temperature does not appear to be a factor. Thank you Trouble codes: P, 0601 (internal control module memory check sum error.), P, 0606 (PCM Processor Fault), P, 0748 (Pressure control solenoid circuit malfunction open circuit/short to ground or power supply), U, 0107 (Lost comm. with throttle control module)	View
	2007 Chevrolet Malibu LT 3.5L cam advance system VIN: 1G1ZT52N47 p0011 is the code that sets for camshaft positon performance (really cam angle performance problem). the parts that have been replaced are as follows: camshaft actuator (us) camshaft position sensor (dealer) camshaft actuator solenoid (dealer) pcm (dealer) i...	View
	2003 GMC Sonoma SL 4.3L Electronic VIN: 1GTDT19X93 Hey guys, have this S-10 truck with manual A/C & no heat from heater, in fact the temperature doesn't change no matter where you put the center temp knob. Air flow mode control is completely normal. Heater hoses are hot and it has flow thru core. Tried to scan...	View
	2003 Oldsmobile Alero GL 2.2L MIL Lamp on VIN: 1G3NK52F93 I recently tested the purge valve assy and that valve holds vacuum correctly, I the tested the purge lines back to the Evap canister and they also hold vacuum correctly with vehicle running and valve activated to create vacuum and then turned off to see if vac...	View
	2006 Other GM 7600 8.0L A/C clutch VIN: 1HTWYAHR36 We are a foreign car repair facility and one of our good customers backed a tractor into the condensor. Replaced condensor and dash says check a/c. Dis-connected the clutch at the compressor and charged to weight. Re-connected and dash still says check a/c. Do...	View
	1993 Pontiac Firebird 3.4L Excessive Emissions VIN: 2G2FS22SXP Need help on this one , This Firebird came in the shop for a Nox failure at 15 and 25 mph under load California emisions, specs call for 400 ppm at 15 and 25 mph, This vehicle is reading above 700. The customer came to the shop with a car that just got tuned u...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	2003 Cadillac CTS Luxury 3.2L starter VIN: 1G6DM57N93 Ignition key cylinder repaired car. Thank you for all the information.	10
	2000 Chevrolet Impala 3.4L Motor VIN: 2G1WF52E2Y Found that the lower intake manifold had been corroded away by the Dex-cool coolant. One of the coolant passages had corroded to the point where coolant was leaking into the oil-side of the lower intake manifold. We sent the manifold out and had it welded. ...	18
	2003 Chevrolet Monte Carlo SS 3.8L Starting VIN: 2G1W15K539 well the car is still not fixed i have spent several days on this car so i sent it to an electrical specialty shop here i sometimes work with they have had it a week and are just as stumped as i am so i feel a little better but not satisfied. thanks for all yo...	9
	2003 GMC Yukon XL 2500 SLE 8.1L MIL Lamp on VIN: 3GKGC26G33 Thank You for the help. I'm closing this for now because I have to wait for the car to return. I will add the final fix when i complete it. Thanks Again, Greg S. Trouble codes: P0455 (large evap leak).	10
	2003 Saturn Vue 3.0L Coolant VIN: 5GZCZ63B03 Ok, this took quite a while to get the part here (after waiting for authorisation from customer and then schedule times, but finally threw it in, the new cooler is stainless inleu of aluminium, had to order the sealing sings for the fittings seperately, forgot...	10

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