GM Automotive Technicians Technical Discussion and Fixes for Oct 1, 2009

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Open Help Requests for GM

	Help Request	Answers
	2002 Buick Rendezvous CX Plus 3.4L MIL Lamp on VIN: 3G5DB03E52 This is long. Vehicle originally came in for int. ABS light and ABS activation at low speeds. Found both front sensors bad and replaced both hub ass. Cust. then wanted to fix check engine light. I forgot to write down the code numbers and check FF, but I do re... Trouble codes: P0171, P0300	View
	1999 Cadillac DeVille 4.6L Front steering system VIN: 1G6KD54Y8X This vehicle came in to us and the owner is noticing noise coming from the front end while turning, the noise is isolated to the right side. Initially we could see that the right upper strut mount bearing was not turning with the spring, causing it to bind and...	View
	2007 Cadillac Escalade ESV 6.2L MIL Lamp on VIN: 1GYFK66817 Hey guys, We fixed this one. Came in with po 452, fuel pressure sensor low voltage. Dropped the tank and had signal, and return signal{1.4v}. Checked PCM and had no signal at pin 24,{green wire}. The "fix" was to repair the open wire near the rear of the front... Trouble codes: P0452	View
	1984 Chevrolet Corvette 5.7L Poor Idle Quality, Hesitation, Stall, Misfire VIN: 1G1AYO781E This vehicle is not advancing the timing, or controlling the timing as it should. When you time the vehicle with the bypass wire disconnected, it runs good, until you shut the car off. After you plug the bypass back in and start it up it runs like crap. When c...	View
	1993 Chevrolet Corvette 5.7L Surge, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1G1YY23P9P First thank-you for your intrest and help. I started working on this car 1 week ago, the customer told me he was getting a bucking at times. He had already replaced the plugs, wires, ign coil. I drove the car and the cel came on with code 13 & 45 stored. I tes... Trouble codes: 13 (left oxygen senor), 45 (left bank rich)	View
	1995 Chevrolet C1500 Suburban 5.7L Stall VIN: 1GNEC16K5S Hi guys: I this vehicle cames from another shop. Vehicle stall when: stall test, when is in Drive or Reverse and turn steering wheel, or in hard stop. Allways stall except when by-pass is disconected and ignition time is at 0º. Right now, the custumer is angry...	View
	1995 Chevrolet Blazer 4.3L No Start, Hesitation, Cuts out, Stall VIN: 1GNDT13W6S vehicle does not start,it will start if you just bump ignition switch to crank for 1-2 sec.then will start.if hold in crank it will not start,once the engine is running it will have a slight hesition.if you turn on all electrical loads it will fall dead on its...	View
	1996 Chevrolet Blazer 4.3L Poor Idle Quality, Stall, MIL Lamp on VIN: 1GNCT18W1T Hi all. This vehicle will run fine , but 1 out of 50-100 times if you snap throttle, or come off throttle it will run very poor, ready to stall or will stall. Map code I would say is do to idle so bad. Unplugged maf and did not change. Scoped ignition. 14kv wh... Trouble codes: P0107	View
	1999 Chevrolet C1500 Suburban 5.7L abs VIN: 1GNFK16R1X hey guys please help us out here i have a 99 chevy suburban 4wd that kicks the abs pump on at the very end of a stop there are no abs codes we romoved the abs sensors cleaned them and the exciter rings checked for dirt... one was broken in knuckle and we repla...	View
	2001 Chevrolet S10 LS 4.3L Misfire, MIL Lamp on, misfire 1&4 cyl p300 VIN: 1GCCS19W61 truck was towed in with blown engine,replaced with low mile used engine.resealed and tuned.ran great after replacement was completed.truck returned 2weeks later for fuel level sensor repair.thats when we found the misfire codes.no complaint from customer, high... Trouble codes: P0300, P0304	View
	2001 Chevrolet Cavalier LS 2.4L Surge VIN: 1G1JF52T01 Hi everyone, This one car has got me and another tech stumped. The car came to me with a blown engine(coolant in oil, and knocking). I put in a used engine from another 2001 sunfire gt(vin t as well). When the car came to me, it ran okay, no surging. Ever sinc... Trouble codes: C1275	View
	2002 Chevrolet Impala 3.8L Radio VIN: 2G1WH55K62 An intermitant hissing noise is coming out of front speakers even with radio off. Customer brought the car by to show me the "frying egg sound" as it was happening. I checked for the source of the noise and it was coming from the front speakers on the door rig...	View
	2003 Chevrolet Silverado 1500 5.3L heated seats VIN: 2GCEC19TO3 Hello all, Got this 2003 silverado to day with a complaint of heated seat comeing on by itself. check for tsb, none found that matches my problem pulled door panel to check wireing found notthing wrong put panel back on now I am haveing a problem getting it to...	View
	2004 Chevrolet Avalanche 1500 5.3L Vents VIN: 3GNEC12T94 I have a this avalanche that is only blowing in defrost. Went through all of Alldata test which leads to the HVAC Module (climate control head). Replaced it and WORKS for 30 seconds in the modes then reverts back to defrost and will not allow me to do anything...	View
	2006 Chevrolet Cobalt SS 2.0L clutch VIN: 1G1AP14P66 Hi Guys vehicle came in 1 1/2 months ago with a leaking slave cylinder. clutch wouldnt release. we installed new clutch kit with slave cylinder, bled system and returned vehicle. Customer complains that clutch engages at different levels. Sometimes fine someti...	View
	2007 Chevrolet Avalanche LT 5.3L door locks VIN: 3GNFK12317 Strange problem, after locking the truck, waiting about 30 seconds then trying to open doors with either FOB. The FOB is completely dead. put the key in the door lock cylinder and unlock it and the FOB now works great. Lock the truck again and let it sit for a...	View
	2002 GMC Envoy SLE 4.2L Vibration VIN: 1GKDS13S62 Good evening to all,need some help with a GM product. Customer presented the above vehicle with a complaint that it "runs rough".He's a regular here; we've been servicing it for years.Connected scanner,no codes in any system. What I felt was a severe vibratio...	View
	1995 Oldsmobile 88 Royale 3.8L Pressure Modulator Valve VIN: 1G3HN52K4S Please help!Customer brought this vehicle in after trying to replace his own rusted brake lines and misrouted the lines coming out of the pressure modulator valve.No identifying marks are on the valve and Mitchell does Not show which outlet fitting goes to whi...	View
	1995 Pontiac Grand Am SE 2.3L lifter VIN: 1G2NE55D3S Vehcile came for head gasket leak, no noise at this time. Removed the head and sent out for inspection, head is cracked, installed reman head, performed start-up instruction (1500 rpms for 5 min) engine now very noisey. Oil pressure good as stated above. Found...	View
	1998 Pontiac Grand Prix SE 3.8L no power spark knock VIN: 1G2WJ52K0W when problem happens i have noticed that the 18x ref. signal from the icm to the pcm goes to a 5 volt flat line when this happens i loose the tach car has no powerand spark knocks bad due to incorrect injector timing. it sets a p0336 crank code but my 18x cran... Trouble codes: P0336	View
	1999 Pontiac Grand Prix GT 3.8L DayTime Running Lights VIN: 1G3Z44G7A3 This vehicle came in with blower motor inop, only high worked. replaced resistor, all is well. Customer comes back telling me that the light are not working when the fan is turned on just like before. SO vehicle driving down the road, drl working fan working...	View
	2000 Pontiac Grand Prix GT 3.8L factory alarm VIN: 1G2WP52K9Y Customer stated that the "Security" light was flashing, and at one point would start and die. He disconnected the battery and the vehicle started, but the light was flashing still. He drove another couple of days and the same thing happened--no start. He disco...	View
	2000 Pontiac Grand Am GT 3.4L MIL Lamp on VIN: 1G2NW52E3Y service eng light comes on few time had bulbs burned out . now all bulbs ok but has code for b2600. undocumented . does anyone know what this code is ...im thinking abs cause when you start car its off till you drive it approx 10 mph then comes on Trouble codes: B2600	View
	2000 Saturn SC2 1.9L engine VIN: 1G8ZY1272Y This car came in on a wrecker with a dead battery. Customer said he went to start the car in the AM and the car was dead- no lights on instruments, no crank, etc. Battery was dead so we charged the battery almost all day yesterday. Once the battery was charged...	View
	2000 Saturn SL1 1.9L Shift cables VIN: 1G8ZG5285Y This car came in to us with a broken shift cable. The transaxle & shifter felt ok. We replaced the shift cables & road tested for approximately 15 miles. The customer picked up the car and made it two blocks and it broke again (don't you just love it). We used...	View
	2000 Saturn LS1 2.2L Poor Idle Quality, Hesitation VIN: 1G8JU52F0Y Vehicle will in drive when hot have an intermittent chug like an ignition misfire, but so intermittent I can't see it in the shop with scope on coils with (pass thru ignition wiring kit), have disassembled complete coil assembly, checked boots for evidence of ...	View
	2002 Saturn L200 2.2L Power door locks VIN: 1G8JU54F82 This car came in from a body shop. The drivers door was ripped off when the customer opened it up as traffic was going by. The problem with the car is that when your driving down the road the door lock accuators will keep clicking in the down or lock poition. ...	View
	2002 Saturn LW300 3.0L Poor Idle Quality, Stall VIN: 1G8JW84R62 this is a drive by wire throttle setup... I'm at home, don't have access to Mitchell at this time. Need idle relearn procedure for this V6=3.0 L, automatic California car. Thanks in advance for your help.	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1995 Buick LeSabre Custom 3.8L Starting VIN: 1GH4P52L0S REMOVED LOCK CYL. AND FOUND BROKEN WIRES, REPLACED KEY CYL AND KEY FIRED RIGHT UP, THANKS FOR ALL THE HELP FELLAS...	32
	2001 Buick Regal LS 3.8L turnsignals VIN: 2G4WB55K81 Thanks everyone for the info almost everyone was right. Ignition switch dropping voltage on pink wire. When vehicle wouldn't start you could pull out headlight switch like old choke and vehicle would start right up. Thanks again	23
	1986 Chevrolet Corvette 5.7L lean VIN: 1G1YY078SG Well, the owner declined any further engine work. The car was too old and he wanted to trade up for a better one, and I encouraged him to do so. I did look over the car in the morning and I tried the things everyone said, and I got more confused. The inject... Trouble codes: 32 (egr problem).	14
	1999 Chevrolet Express 3500 5.7L Mechanical VIN: 1GBJG31ROX not a pretty job, i used a forklift with chain across back of heads,a rachet strap from fork to crank pulley. did't have to even remove throttle valve! it's real tight,removed motor mounts thanks to everyone!!!	12
	2001 Chevrolet Silverado 1500 5.3L Steering Gear VIN: 2GCEK19T61 This Vehicle was a long troubled fix. The end result was finding out about a GM TSB on using a different Gear Box, the Box that corrects this problem is for a 3/4 Truck, The dealer installed this box and my customer has informed me that the problem is now gone...	8
	1995 GMC Sonoma SLE 4.3L abs lamp VIN: 1GTDT14Z4S Thanks for the replies from all who took their time, Gerry from Michigan is the ace today, while only working with the right front and observing a nice wave form from all sensors till 35 mph, it was confusing as to what could happen at that speed. The monkeys ...	4
	2003 GMC Envoy XL SLT 4.2L battery VIN: 1GKET16S53 Well thank you all for the help the problem did turn out to be the blower motor control unit, staying on and allowing the current draw in excess of 3Amps. Thank again	6
	2001 Oldsmobile Alero GL 2.4L ignition VIN: 1G3NL52T81 Hey guys first off thanks for the time to respond to my help request.Sorry for the delay in closing.Still have not fixed this pain in the @#^!& yet.Security does not seem to be the problem.Got a used pcm from local bone yard and it at least tried to start.I no...	16
	2005 Pontiac Vibe 1.8L timing chain VIN: 5Y2S163805 Can unlock cam actuator manually by jumpering solenoid and applying air pressure to filter plug but wiil not unlock running with solenoid energized. Moved to back burner for a while, thanks to all who took time to read or reply	8

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