GM Automotive Technicians Technical Discussion and Fixes for Dec 17, 2008

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Open Help Requests for GM

	Help Request	Answers
	2000 Cadillac Catera 3.0L Accessories VIN: WO6VR54R5Y hi guys i have this 2000 cadillac catera . guy needs to program 2 new keys . plug the tech 2 in went to immobilizer special functions went to program keys the tech2 ask for a code i get the code is 4629 enter it says all keys program still the 2 new keys did n...	View
	2000 Cadillac Escalade 5.7L Poor Idle Quality, Hesitation, Cuts out, Stall, Misfire, MIL Lamp on AFTER START UP, VEHICLE HAS "OK" IDLE, HOLDS STEADY AROUND 900 RPM. HOWEVER ON ACCEL, ESPECIALLY WOT, ENGINE SEVERELY HESITATES, BACKFIRES, COMES VERY CLOSE TO STALLING. CHECKED FUEL PRESSURE, FOUND GOOD RESULTS, 48-52 PSI. PRESSURE AT RAIL. REMOVED ALL SPARK ...	View
	2005 Cadillac STS 4.6L ipm/rim VIN: 1G6DC67A35 To all valued techs HELP !!!.Vehicle came in for radio replacement due to cd player not working .Installed used radio/cd player(tried to help out) and the usual theft lock appeared .I tried to relearn vin in radio and would not work so I went into the instrume...	View
	1990 Chevrolet Lumina 3.1L No Start VIN: 2G1WL54TXL i know this is a fossil i have done thousands of this type of ignition systems but i am at a loss on this. when the car was towed in last week for a no start i found no spark & no injector pulse & no codes some one replaced crank sensor the connector and alter...	View
	1991 Chevrolet S10 2.5L Hesitation, Cuts out VIN: 1GCCS14A7M problem is caused when EGR valve opens just off idle. The egr solinoid valve is turned on by ecm all the time except at wide open throttle so when ever throttle is raised above idle vacuum is supplied to egr which opens and causes engine cut out and miss. Does...	View
	1992 Chevrolet Lumina Euro 3.1L Poor Idle Quality, Stall VIN: 2G1WN54TXN Okay I got a real hair puller here. This 92 lumina has a 2.8 out of something else, not sure what. engine was put in 2 owners ago and was told "it never ran right since". customer stated that when it warms up it will stall at a stop and have to "two-foot" it t... Trouble codes: 34 (map sensor circuit low), 44 (o2 lean), 35 (iac error)	View
	1997 Chevrolet Lumina 3.1L MIL Lamp on VIN: 2G1WL52M5V This one has got me stumped, The local tech school installed a used transaxle in this car for reasons unknown, Car always stays in 3rd gear, codes p0560, p1635 stay set, I have follwed flow charts for both codes and the 2 power feeds to PCM are same as battery... Trouble codes: P0560 (System Voltage), P1635 (5 Volt Reference Circuit A)	View
	1999 Chevrolet Blazer 4.3L No Start VIN: 1GNCS13W0X The engine when cold will not start with out the addition of an external fuel supply. I use propane into the air cleaner. Once I give it propane it starts and runs fine even after I remove the propane. It has great spark and 60psi fuel with great volume. Compr...	View
	2000 Chevrolet Blazer LS 4.3L MIL Lamp on VIN: 1GNDT13W7Y The car came in to my shop couple days ago with hard starting and no power complaint,I scaned it and it threw 3 codes,P0131 o2 no signal,P1351 ignition control problem and a missfire code.I checked the basics fuel pressure spark and data from scaner,replaced t... Trouble codes: P1351	View
	2000 Chevrolet Silverado 1500 5.3L Mechanical VIN: 2GCEK19T8Y hey guys I've been working on this vehichel for the past few days and am out of ideas. the problem is when you first start the truck in the morning it idles very rough and will die. it runs fine on high idle and rpms. once it has run for a couple of minutes it...	View
	2001 Chevrolet Malibu 3.1L High Idle VIN: 1G1NES2J91 This car has been in 3 times in the last 6 months for this problem, very intermittent. When it acts up it has a very high idle, 2500rpm. If you shut the engine of and restart all is fine. Car came in today for same problem. Fuel trims around zero, tps at .61 V...	View
	2002 Chevrolet Monte Carlo SS 3.8L brakes VIN: 2G1WX15K32 We put brakes and rotors on car and now cust complains of a bad shake when brakes are applied at over 60mph.couldnt find anything wrong so we replaced every thing again,actually torqed the lug nuts,no change.front end seems tight.please help I dont know what e...	View
	2003 Chevrolet Tahoe LT 5.3L electronic control VIN: 1GNEK13Z63 This truck had a lot of codes for the 4wd control system: C0300 C0305 C0359 C0374 C0379 C0550 Also had B0790 B2725 U1301 U1227 (wowzas!) System hard-codes a C0321 - transfer case lock malfunction - after clearing DTCs. Per GM's TSB since I had a C0550 I th...	View
	2004 Chevrolet Tahoe LS 5.3L tccm VIN: 1GNEK13T24 greetings to all this tahoe has a message service 4 wheel drive i went to retrieve codes have no communication with module i tested powers and grounds at module all ok installed a new module and still no communication.i can communicate with all other modules a...	View
	2004 Chevrolet Tahoe LS 5.3L traction control activating VIN: 1GNEK13TX4 Hello and thanks in advance for any ideas !!! the truck came in with the complaint of lack of power no check engine or stored codes found .during test drive under light accelaration traction active light lights up and truck reduces power and abs pump sounds li...	View
	2001 Oldsmobile Intrigue GLS 3.5L monitors not setting VIN: 1G3WX52H01 failed pa. emission test mil on p0410 flagged.Found that vacuum control solenoid was not being grounded by the computer,Air pump operates as intended.The computer was replaced at Gm dealer and reprogrammed,now i can not get the secondary air or evap monitor to... Trouble codes: P0410	View
	2003 Oldsmobile Alero GL 2.2L No Start VIN: 1G3NL52F33 Ok here it is. This car came in with the cust. complaining that it would start and run and cut off in 3 sec of running then it would just spin with a no start. I have fuel pressure and fire but no injector pulse. I have replaced the ignition switch already abo...	View
	2000 Pontiac Grand Am SE 2.4L ETS Light VIN: 1G2NF52T4Y Hello all techs and happy holidays. I have a 2ooo pont grand am that the when you start the car the trak off light will stay on all the time.If the key is on and eng off the trak off light will come on for 3 sec and go off like normal. In the key on pos, if yo...	View
	2003 Saturn Vue 2.2L motor VIN: 5GZCZ43D53 First problem is a noise coming out of the top rear of the motor. Kind of a raspy whirring noise that goes up and down with engine rpm. Doesn't matter if car is in neutral or in gear. Motor and tranny seem to operate fine. The other problem is a service engin...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	2005 Buick LeSabre Custom 3.8L Internal Mode Switch VIN: 1G4HP54K75 Thanks for all the replys. I should have stated that I use a Tech 2 scanner and GM's SI for service info, so all service and scanner info is available and current. I inspected all the common areas for harness chaffing & grounding and added corrogated split con...	11
	1994 Chevrolet S10 4.3L fork VIN: 3456987654 Pounded out the floor and it now shifts. Reverse is still hard. Thanks for all the help guys!!!	14
	1995 Chevrolet Blazer 4.3L computer VIN: 1GNDT13WOS Thanks to all who replied.After trying most sudjestons we still had same problemb.We had custimer take vehicle to smog check station at different location.Tech manualy entered vin # and did not have to plug in to OBD2 connector.I was told that our smog machine...	11
	1998 Chevrolet Astro 4.3L MIL Lamp on VIN: 1GNDM19W6W Well guys, I really appreciate the speedy and accurate information I recieved. We got the vehicle back in and confirmed everyones diagnosis. It indeed had fuel on the back side of the injecter plug which was forcing fuel up the inside the wires and into the EC...	10
	1999 Chevrolet Silverado 1500 5.3L Shifting,power VIN: 2GCEK19T5X Thank you to all who gave the expretise and ideas. In the end it was the shift control solenoids at fault we replaced them, now the truck performs like a champ. Thanks again John [...]	4
	1999 Chevrolet Corvette 5.7L Hesitation, Stall, Misfire VIN: 1G1YY22G1Y hi every one the car is fixed i think we ran injector cleaner through it then cleaned the throttle bodies a couple of times so far so good the ide is still a little rough but it does have a 100000 miles on it so it wont be perfect but it does run fine we will... Trouble codes: P0354 (ignition coil 4 pimary circuit d), P0300 (random missfire multiple cylinders).	13
	2000 Chevrolet Silverado 2500 6.0L Drive Train VIN: 1GLGK29UOY the torque converted was causing the shutter you could watch torque slipage rpm rise when it was shuttering accellerate to unlock converter shutter would go away.Replaced torque converter fixed the rumble strip	11
	2001 Chevrolet Venture LS 3.4L abs module VIN: 1GNDX13E51 We have checked for any codes, which there was none, so it was hard to know where to begin. The vechile was drove numerous times with the scanner hooked to it, hoping to catch what was happening, unfortunately the van didn't glitch when the scanner wa...	5
	2002 Chevrolet Tahoe LS 5.3L oil, and compression rings VIN: 1GNEK13Z02 Thank you all for your replies affter reassembling the engine I started the engine with a back presure gauge installed on the right hand bank and found that it would rech ove 110 psi. replaced the cats and found that the truck would run fine. I also found that...	8
	2003 Chevrolet Avalanche 1500 5.3L starter motor VIN: 3GNEK12T56 Thanks to all thay took time to help. The cam sensor does afect the start cicle on the truck. I discovered no continuity in the sensor cables and took of the protecting cover and lo and bejold about 4 wires broken including one that goes to the CMP and also t...	5
	1993 GMC G3500 Rally 5.7L Electronic VIN: 2GTGG39K5P thanks for all the replies.suggestions varied from ign switch,module living under seat(corrosion, and bad grounds,which was the problem on this one.someone removed the pigtail from the bat ground that goes to the body. reattached grond and everything works fin...	7
	1998 GMC K1500 Sierra SL 5.7L No Start VIN: 1GTEK19R6W this vehicle is not fixed, i do not have access to a TECH 2 scanner that will access the BCM or VTD, costomer would not authorize any repair unless it was a for sure fix so i recomended that he take it to the dealer, he refused and took the vehicle. thanks for...	11
	2003 GMC Yukon XL 1500 SLT 5.3L ecm, abs, locks VIN: 3GKFK16Z23 Customer has had vehicle back for 3 days now and problem seems to be fixed. We chased all the connectors to the pcm, bcm and ipc, the aldl, the fuse and relay box. Some suggested that we might have a faulty Delco battery, because of their extensive corossion p...	11
	2006 Hummer H3 3.5L Misfire, MIL Lamp on VIN: 5GTDN13696 Thanks to all who replied.Performed a cylinder leak down test on affected cyls. showed leak to intake on both 2 and 5. Called customer, he had purchased an extended warranty through G.M. I called dealer for him and they said they would cover it, so its off to ... Trouble codes: 300 (missfire).	9
	1998 Oldsmobile Regency 3.8L blower motor VIN: 1G3HC52KXW I found the auto temp wiring diagram on alldata.Dealer said that car shows a module,relay and no resister.My diagram doesn't show a blower relay and resister,only blower module.I couldn't find procedure for auto temp,just manual temp.Went with the 2 out of 3 r...	3
	1992 Pontiac Grand Prix SE 3.1L wont move unless cold VIN: 1G2WJ14T8N Thank you guys for your help. I replaced trans and all is well. I stuck in a used one and it shifts great. This is my personal car and it has never drove this good. So I was driving on a going bad transmission for quite some time. Thanks again.	7
	2001 Pontiac Grand Am SE 2.4L Starting VIN: 1G2NF52T71 Found high oil pressure(85PSI), changed oil pump. Found fuel injectors leaking down, Bad gas, dried to a brown gel. Replaced inj. and gas and did a top end cleaning. Starts and runs great. Thanks for your help.	13
	2002 Saturn SL2 1.9L Poor Idle Quality, Stall, MIL Lamp on VIN: 1G8ZK54782 Thanks to Joseph (TPS or CTS), Dwayne (CMP), Roger (engine wiring or loose timing chain) and Russ (TPS or intake leaks). The repair required a wiring repair of the light blue/black lead which, looked normal but it's conductor was almost completely open. Thanks... Trouble codes: P0341 (CMP out-of-range), P0506 (Idle control RPMs too low), P0509 (Idle control circuit high), P1599 (Engine stalled even though the key was still on).	4

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