GM Automotive Technicians Technical Discussion and Fixes for Jan 11, 2011 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1993 Buick Regal Custom 3.1L MIL Lamp on VIN: 2G4WB54T9P this vehicle came in with 13,15,23,32,42,66 codes, and i knew that these cars has a history of problem with there computers, so i took another one out of another vehicle that i know is running ok (93 camaro -[...])and for some reason it is showing the same ... Trouble codes: 13 (15 -), 15 (21 -), 21 (22 -), 22 (24 -), 24 (32 -), 32	View
	2002 Cadillac DeVille DTS 4.6L Wheel Speed Sensor VIN: 1G6KF57952 when vehicle hits a bump the abs light illuminates and sets a code c1235 right rear wheel speed sensor open or shorted i replaced the right rear hub assy. with a new wheel speed sensor from the dealer and the problem still exists. this problem is very intermit...	View
	2006 Cadillac SRX 3.6L No Start VIN: 1GYEE637X6 Hey guys, My customer says that his vehicle has a flooded condition (his description) after every fill up at the pumps. It doesn't matter what temp the engine is at. He even tried only filling to half and it still happens. The vehicle has no codes and runs fl...	View
	1995 Chevrolet S10 2.2L Excessive Emissions, Poor Idle Quality, Hesitation, No power VIN: 1GCCS144XS Engine starts but idles very roughly; engine will not rev and has no power at all; had codes 32, 33, and 34 stored; modis shows 66 degrees spark advance with key on, engine off; 33 degrees advance at idle; "knock" reading constantly ranging from 0 - 300 with k...	View
	1996 Chevrolet Corvette Grand Sport 5.7L brake pedal VIN: 1G1YY2257T I have replaced the master cylinder twice and I still have a low pedal only on first stroke of pedal and it slowly drops. I have also locked lines pedal still drops. I plugged master cylinder where lines connect pedal is good and solid. I am down to the modula...	View
	2000 Chevrolet Corvette 5.7L Keyless entry VIN: 123XN67890 Hi Techies! I have a 2000 corvette with keyless entry problem. It seems the system loss memory on new registered remote. one remote can be resync but will not work if you wait for a minute and trying to use it again. Another remote just cannot be learned by sy...	View
	2005 Chevrolet Silverado 2500 HD LS 6.6L Hesitation, Stall, MIL Lamp on VIN: 1GCHK23225 Help please duramax gurus. This truck intermittantly will not have enough power to pull itself off a stop. Died at idle once. Codes P0101, P0102, P0299, P0401, P0404, P0670,P0700, P1404,P2563, U0105. I cleared codes and none came back. P0101 returns after a sh... Trouble codes: P0101, P0102, P0299 (turbo underboost), P0401 (Insufficient EGR flow), P2563 (Turbo boost control sensor performance), U0105 (Lost comm with FICM)	View
	2005 Chevrolet Silverado 1500 LT 4.3L No Start VIN: 1GCEC14X95 this truck was towed in, customer said they ran out of fuel, put fuel in tank still no start. checked fuel pressure, 60 psi good pressure. checked spark at coil no spark at coil. connector has battery voltage and is getting signal from pcm. replaced coil, stil...	View
	2006 Chevrolet Silverado 2500 HD LT 6.6L Cooling Systems VIN: 1GCHK23226 Thanks for any help on this. I have this 06 6.6 duramax with a coolant leak that is coming from some place above the starter, runs down the spacer between the transmission & block. I can not see where it is coming from without taking things apart & I have neve...	View
	2006 Chevrolet Monte Carlo SS 5.3L Rear Defrost VIN: 2G1WL16CX6 The rear defroster in this thing wont work. I have battery voltage on the purple power wire at the grid but as soon as I plug it in it goes to .000 volts. I also have a good ground on the other side of the grid. Fuse and relay both test goodand voltage stays t...	View
	2007 Chevrolet Suburban 1500 LT 5.3L Tailgate Motor VIN: 1GNFK16327 Customer complaint of rear power liftgate not working. Tailgate opens normally by hand. If you press the key fob or tailgate release on dash the tailgate unlocks and makes the buzzing noise like it is going to open but it does not. When the tailgate is opened ...	View
	2008 Chevrolet Uplander LS 3.9L MIL Lamp on VIN: 1GNDV23W48 This has been an on going issue with the check engine light on. This is a taxi vehicle that puts on lots of miles. We have seen the van five times now and have had slightly differnt issues every time, bu the p1174 code is the only one setting now. It takes the... Trouble codes: P1174	View
	1995 GMC K1500 Sierra SLT 5.7L pcm VIN: 2GTEKI9K3S Has anyone tried to update a 1995 GMC pickup to 1996-1998 vortec engine, pcm and all underhood wiring? We have a donor vehicle. We what the newer PCM because it is laptop programmable.	View
	1999 GMC Yukon SLT 5.7L Transfer Case VIN: 1GKEK13R8X Ok, we have this vehicle super clean and low mileage. Customer stated service 4WD light would occasionally flash. My tech found codes related to the encoder. Tried a new one and it jammed up and blew the fuse. I thought the aftermarket one may be junk so got a...	View
	2004 GMC Sierra 1500 4.8L Instrument Cluster VIN: 2GTEC19V44 all gauges, tach and speedo are inop. t/s and hazard indicators flash. b+ and ign 12v present as well as ground. no scanner comm to ipc, comm ok to all other modules. oem radio works properly. bcm & airbag mods have u1000 fault codes but not problems so i gath...	View
	2001 Pontiac Grand Prix GT 3.8L MIL Lamp on VIN: 1G2WP52K91 2nd help request it 2 days! On this Pontiac the Air Pump keeps filling up with water. This time of the year it turns to ice and pops the fuse on a regular basis. I knew about the air intake TSB that relocates it to under the hood, so we made that change. The a...	View
	2001 Pontiac Montana 3.4L Defrost VIN: 1GMDX03E62 This Montana is killin us! Here's the skinny: Comes in for no heat. Find bad t-stat, replace but the heat still is not what it should be. Pull heater core and its partially plugged, replace and return to customer. Comes back three weeks later heat quit, find l...	View
	2003 Pontiac Bonneville SE 3.8L Hesitation, Surge VIN: 1G2HX52K43 A Simple 3.8 has me buffalo'd. This car will give a hesitation (less sharp than an ignition miss) under very light throttle in drive or overdrive with torque converter clutch engaged. Engine must be fully warmed up. RPM never changes and all data on the scanne...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	2003 Chevrolet Silverado 1500 5.3L t-case VIN: 1GCEK19T73 well time goes by and was working with jasper on this truck come to fined out the t-case motor needed to be programed to the truck reflashed the tcm and all is working now thanks for all the help	13
	2006 Chevrolet Tahoe LS 5.3L MIL Lamp on VIN: 1GNEK13T06 thanks to all how replied i did the tsb repaire and no concerns by his wife been a while no call backs i started cheep first. the economies still tough. thank you iatn Trouble codes: U1026, U1041.	9
	1997 Pontiac Sunfire SE 2.2L t-stat VIN: 1G2JB1249V Thanks to all those who replied, the fix was simple a new heater core, flow through the core is mandatory for the t-stat to have enough engine heat to open,,low flow no open! simple yet stupid on the engineers abilities to see this happening,, typical of GM, d...	19

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