GM Automotive Technicians Technical Discussion and Fixes for Feb 9, 2012 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1995 Buick LeSabre Limited 3.8L Poor Idle Quality, Hesitation, Cuts out, Stall, MIL Lamp on VIN: 1G4HR52L4S this vehicle continually sets code P0341, I've gone through the flow charts for code 341 and 342 with no help. I believe that I [...] have a wiring problem, but I have tugged and pulled and wiggled every wire on this thing that I can got to and I have found noth... Trouble codes: P0341 (cam/crank error)	View
	2001 Buick Regal LS 3.8L trans. shifting VIN: 2G4WB55K91 transmission has shifting issues. takes off in 2nd, will shift 3rd. no first gear, no overdrive. has code p0758. we have checked wiring harness & connector at transmission but see no issues. code symptoms don't match our shift problems either. this is a replac...	View
	2002 Buick Rendezvous CX 3.4L whole truck VIN: 3G5DA03E32 I hope someone has run into this one before. This truck (SUV) has a very annoying vibration ( like engine is resting on frame)at idle in or out of gear. It can be felt throughout the whole vehicle. The engine does not seem to have excessive vibration when plac...	View
	2005 Buick Rainier CXL 4.2L Monitors wont reset VIN: 5GADT13S05 Could use some help with this one. Replace coolant sensor and thermostat for check engine light. That was easy. Now the hard part. Cleared codes and performed drive cycles and have 2 monitors that wont complete. Evap and secondary air. Drove this truck 400 mil...	View
	1994 Cadillac Seville SLS 4.6L Stall VIN: 1G6KS52Y2R I have this Cadillac that will intermittantly stall going down the road at cruise. Sometimes you can drive it 20 miles and it will never act up but than at other times you can't get a mile from the shop. When it does stall it is like someone just shut the key ... Trouble codes: 95 (Engine stall detectedhistory)	View
	2004 Cadillac CTS 3.6L See Text VIN: 1G6DM57744 I'll try to keep this short, because I could type for hours. Car was towed in because shifter won't come out of Park and now key won't release to take out, stays in accessory , but will crank and run. Has U1300 in ECM, and U1000 in all other modules except Rea... Trouble codes: U1300 (In ECM Only), U1000 (In all other modules on Bus except RIM)	View
	1995 Chevrolet K1500 5.7L Speed 25+ Flywheel Grind Sound VIN: 2GCEK19K2S After rear main seal replacement customer brought me this truck with a grinding that sounds like the flywheel is hitting something. I checked the flywheel and looks fine. Readjusted the transfer case linkage and four wheel lights come on. At speeds above 25 th...	View
	2001 Chevrolet Impala 3.4L No Start VIN: 2G1WF52E71 Hello GM techs. I just have a question about programming a BCM on this Impala. The car needs a BCM, I have installed a used one and relearned the passlock. The car starts and runs no problem there but the service vehicle soon light comes on and it sets a code ...	View
	2003 Chevrolet Tracker 2.0L Valve Noise VIN: 2CNBE13CX3 Upper timing chain guide on head broke and fell behind cam gears which caused all of the problem on the interfence engine. After students r & r the cyl head and replace all components and cranked engine the valve lifters make a very loud noise. My question is,...	View
	2003 Chevrolet Trailblazer LTZ 4.2L Front Brakes VIN: 1GNDS13S63 This is one of the "from hell" vehicles that we all dread. Truck came in with fading brake pedal. I verified the master was bleeding by and installed a brand new unit, Cardone, bled the system and was told to install new rotors and pads all the away around. af...	View
	2007 Chevrolet Cobalt LS 2.2L Cooling Systems VIN: 1G1AK15F47 I have an 07 cobalt with 2.2 that ISNT overheating, just running warmer than usual. Customer has had car since new,and states that car always ran between 185 and 199,according to inst.cluster display. Recently it has began to climb to 218-222, only at idle. We...	View
	2008 Chevrolet Equinox LS 3.4L shifter VIN: 2CNDL23F78 unable to shift out of park intermittantly when cold	View
	1999 GMC Yukon SLT 5.7L No Start Helping out a friend here. 99 Yukon with the 5.7 Vortec, vin R. Vehicle running down the road and died, never to restart. He checked for spark and found it present, then he sprayed carb cleaner in the intake and truck runs as long as you keep spraying. He assu...	View
	2001 GMC Sierra 2500 HD SL 6.6L Excessive Emissions, Poor Idle Quality, Misfire VIN: 1GTHK23171 Having problems with connecting scan tool to this vehicle and running function tests. I first used and OTC , when trying to perform cylinder kill test , kept kicking me out of the system - no comunication ect. Purchased a MDI from Bosch w/tech II on lap top - ... Trouble codes: P0202, P0204, P1261 (ECM detects circuit fault related to high voltage cylinders 146or7), P1262 (ECM detects circuit fault related to high voltage cylinders 235or8)	View
	2002 GMC Yukon SLE 5.3L no start VIN: 1GKEK13Z92 1 week ago towed in no start, started up no problem, check codes DTC 1631 cleared tried for 2 days no problem sent on its way back again yesterday towed in started up no problem same DTC check BCM data pass lock valid code 5 starting good all day long. dont wa...	View
	2005 Pontiac Vibe 1.8L Radio & Heater Control VIN: 5Y2SM63825 We have some backlighting not functioning in this Goyota. Does anyone know in advance which lamps I need to get in order to repair the radio and heater control backlighting? Any advice on lamp replacement? I suspect I will be soldering when it comes to the rad...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	2002 Cadillac Eldorado ETC 4.6L body VIN: 1G6EC12972 the PCM was replaced by a new one reprogram and al the problems were solved not after 4 days of checking testing and investigating . over and over by the way 1 PCM replaced from the dealer was defective took 2 PCM s to get it Thnak you for every one input	13
	2004 Chevrolet Silverado 2500 HD 6.6L No Start, MIL Lamp on VIN: 1GCHK23114 thanks for all the replies.Upon further testing,we removed the injectors---loaded with rust and debris,causing too much of a restriction and the fuel was by-passing.Recommend replacement of the injectors and a cleaning---now it's up to the customer.As always,t...	8
	2005 Chevrolet Colorado Z85 3.5L headlamps VIN: 1GCDT19695 thanks for all the help ended up bieng combination of fogged headlamps and alt low amperage at idle	4
	2006 GMC Savana 2500 4.8L dash lights VIN: 1GTGG25V86 So far no fix found. We are going to put 10 amp fuses in line to seperate direction of fault so we know which way to proceed. Thanks for the replies. Matt	2
	2008 GMC Yukon XL 1500 SLE 5.3L door locks VIN: 1GKFK16388 Thanks to all that responded, believe it or not vehicle had three bad door lock actuators. The customer never said nor knew if actuators went bad all at once or one at a time, Sure would have helped but as usual got to be a detective and a technician ! The rem...	6
	1999 Oldsmobile Silhouette Premiere 3.4L Steering gear/Pump VIN: 1GHDX03E8X Thanks to all who responded, air appears to be the problem here, Ive never had one this bad, the ultimate fix here was to rig my a/c vacuum pump to the top of the resivior, and pulled vacuum for about 45mins,(we had been using a hand vacuum pump per A1 Cardone...	13

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