GM Automotive Technicians Technical Discussion and Fixes for Sep 6, 2007

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Open Help Requests for GM

	Help Request	Answers
	1999 Buick Park Avenue 3.8L Cuts out, Stall VIN: 1G4CW52K88 owner stated vehicle died while driving - vehicle would crank over but not start - was stalling out prior - checked for codes - none stored - road tested for 3 days straight without a problem (120 miles ) - vehicle finally acted up coming off highway felt like...	View
	2000 Buick LeSabre Custom 3.8L electric windows, locks,mirrors VIN: 1G4HP54K6Y Power windows, door locks, mirrors, and trunk release will not work from driver door ONLY. Windows and door locks work from other doors. Heavy orange wire from circuit breaker and smaller orange wire from 10 amp fuse have power and all grounds check good at mo...	View
	1998 Cadillac Seville STS 4.6L Theft System VIN: 1G6KY5492W Still have this cadi beatin me up. Sets a code B3055=(The PASS-Key III Theft Deterrent (VTD) Module performs an internal test to determine if a key is present every 300 milliseconds . If the test determines that a key is not present the VTD module will indicat...	View
	1989 Chevrolet Camaro Iroc-Z 5.7L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1G1FP21E7K This vehicle came into my shop running very rough and idling high. Customer stated that a performance shop installed an LT1 engine with an LT4 camshaft. Horrible butchers!! Customer stated that the pcm is factory and that the performance shop said it was runni... Trouble codes: 26 (Quad Driver 1 fault), 43 (ESC Module or circuit fault)	View
	1996 Chevrolet Blazer 4.3L noise VIN: 1GNDT13W5T Hi all this customer came in asking me to replace his lifters on his 96 S-10 blazer. I told him it sounded like some thing in the timing cover. He told me the chain and rod bearings were already replaced. the reason for the visit was and still is a valve train...	View
	1998 Chevrolet Express 3500 6.5L shift solenoid VIN: 1GBJG31F5W vehicle intermittently will not go over 40 miles per hour.customer is the only one to witness this.customer said the rpms go up like its stuck in second gear.i cleared the codes .test drove the vehicle had no problems.any help would be good	View
	1998 Chevrolet Malibu 3.1L cooling fan VIN: 1G1ND52MXW After having engine replaced, cooling fan does not operate. Replaced cts with a new one, and then a known good one. Scan tool values for cts are with in a few degrees of temp gun reading on cts. In scan tool you can command the cooling fans on both high and lo...	View
	1999 Chevrolet C1500 LS 5.7L Low Beams VIN: 1GCEC19R5X This truck is the victim of excessive tilt usage. The wires to the turn signal dimmer multi-function switch have broken at the connector, which has resulted in the low-beams working intermittently if you tilt the wheel to the right spot. Two of the wires in th...	View
	1999 Chevrolet Astro 4.3L Poor Idle Quality, Hesitation, Stall, Misfire, MIL Lamp on VIN: 1GNEL19W5B Help: I have a difficult one for you guys...maybe.My Customer bought this van and brought it to me because it misses once it gets hot.When you first start it , it runs great.Once it has run for an hour or so ,it delevopes a miss in # 5 cylinder...when you load... Trouble codes: P0300 (Multiple Missfires), P0305 (5 Cylinder Misfire), P0306 (6 Cylinder Misfire)	View
	1999 Chevrolet Blazer 4.3L rear-end? VIN: 1GNDT13WGX This one has me hangin' out on desolation row...There is an intermittent noise coming from the rear of the vehicle under 2 different scenario's 1) noise sometimes occurs over bumps or 2) wiil occur when changing lines under load (not a wheel bearing noise thou...	View
	2000 Chevrolet S10 4.3L Excessive Emissions, MIL Lamp on VIN: 1GCDT14W9Y thnaks in advance for any hep we get, we have a 2000 chevy s-10 4.3 that came in with a check engine light on, we initialy scanned and had p0172 and p0175 bank 1+2 rich, we checked fuel pressure and it was 60psi, good. while monitoring the scanner we noticed t... Trouble codes: P0172 (fuel system bank 1 too rich), P0175 (fuel system bank 2 too rich)	View
	2001 Chevrolet Monte Carlo LS 3.4L ac alternator radio VIN: 2G1WW12E51 hello people ! need some help here .this monte carlo has several problems. the display on the cluster flashes battery light service vehicle soon security.vehicle starts and runs fine alternator is puttin out 14.1 volts .no codes . also upon start ups the radio...	View
	2001 Chevrolet Silverado 1500 4.8L Misfire, MIL Lamp on VIN: 2GCEC19V41 Hello techs, the customer says the CEL light started flashing a couple of days ago. I found code Po300 random misfire. Just a little more quick history before I go on. The engine became an oil burner @ 90,000kms(not sure why) and the customer was complaining o... Trouble codes: P0300	View
	2003 Chevrolet Malibu 3.1L No Start VIN: 1G1ND52JX3 Vehical has been towed in four times for no start in the past year. After removal from tow truck it starts. I have never been present at site of no-start. 97000 miles so I suggested a OEM fuel pump... Pump replaced. two months later towed in again, fuel pressu...	View
	1997 GMC Yukon SLE 5.7L wheels VIN: 1GKEK13RXV vehicle on tight turns(parking lot speed) tires skip/drag across the pavment almost like engaged in 4wd,but not.customer has owned vehicle scince new and untill last week neverhad this occur.i have checked front end and found no loose parts(idler arm is even t...	View
	2006 GMC Sierra 3500 SL 6.6L shifting thanks inadvance for any help you can give me. this is my boss' truck & i rebuilt it so i'm married to it. everything worked fine for first 7,000 miles,but now is throwing codes p05629 (cruise ciruit low,i think),p0827 tap up & down shift circuit low,& u1041 n... Trouble codes: 0562 (cruise control), 0827 (tap up down switch), U1041	View
	1991 Oldsmobile 98 Regency Elite 3.8L MIL Lamp on VIN: 1G3CW53L7M Hello I have this olds here that the check engine light is on for a code 41 no cam ref signal. I had put in a new cam sensor without any luck. I did the pin point test for the code 41. It had me check voltage at cam sensor connector. Had me test a&b there was ... Trouble codes: 41 (no cam reference signal)	View
	1999 Oldsmobile Alero GL 2.4L No Start VIN: 1G3NL52T0X I have a 99 Old Alero that all of a sudden quit running yesterday. It is my brothers car that was damaged in the rear and has been fixed, but has been sitting for a few months. Has been running fine. Went 2 days ago and filled it up with gas and drove it appro...	View
	1993 Pontiac Grand Am GT 3.3L MIL Lamp on VIN: 1G2NW14N8P Hello everyone. WE replaced the engine in this car. On the test drive the MIL came on with codes 26 & 27 quad driver failure & 2nd gear switch problem.The scanner shows that it is always in second gear but seems to shift good when driving. The troubleshooter i... Trouble codes: 26 (Quad driver module failure), 27 (2nd gear switch problem)	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1999 Buick Regal LS 3.8L cooling fans VIN: 2G4WB52K2X How hot is hot? Hot enough to boil over or just high on the gage? When the sand is removed from the radiator fins and a new coolant temp sensor is installed hot its not.Thanks to all who participated and even those who did not.Hi fan operation happens at 235 d...	11
	1998 Cadillac Seville STS 4.6L theft deterent VIN: 1G6KY5492W Well most people still thought i had two little wires going to the lock cyl. that can break. not on a PK3 system. Anyway, code B3055 says theft module is not seeing the key or correct key. Found that after clearing the codes and light, by the way you can clear...	12
	1998 Cadillac DeVille 4.6L instrument cluster VIN: 1G6KD54Y4W I was unable to repair this vehicle my self. After speaking to Cadillac they told me i would need to buy a new VATS module and reprogram. Then I spoke with a speedometer repair facility and their reply was necessary to send the instrument cluster to New York r...	4
	1995 Chevrolet Tahoe 6.5L Excessive Emissions, Poor Idle Quality, MIL Lamp on VIN: 3GNEK18S8S after many helpful replies, and taking a few days off from working on the truck. we attacked it with a fresh attitude. we once again changed the injection pump. Truck now runs and starts perfect. We sent the pump out to be checked and they told us the optical ... Trouble codes: 36 (injector pulse width error/ long resonse).	5
	1997 Chevrolet S10 LS 4.3L MIL Lamp on VIN: 1GCCS19X0V I WOULD LIKE TO THANK ALL OF YOU FOR YOUR TIME , AFTER COMPLETE TUNE UP,INJECTION CLEANING AND STILL GETTING MISSFIRE READINGS I POSTED UPDATE AND CONFIRMED THAT CRANK SENSOR WAS INDEED WHERE MISS FIRE WERE PICKED UP WE DECIDED TO CHANGE THE SENSOR. WHEN REMO... Trouble codes: P0300 (multiple missfire).	23
	2000 Chevrolet Blazer LS 4.3L convertor VIN: 1GNDT13W2Y Talked to customer yesterday and he said it has not acted up since i worked on it last. I believe that the original valve was faulty.	6
	2001 Chevrolet Lumina 3.1L HVAC Mode doors VIN: 2G1WL52J31 Thanks to all that helped me out. It was a disconnected vacuum line under the dash by the steering column. Could not hear the leak due to all the covers and leaking exhaust system. Turns out that owner had a amp put in and they ran the power wire through the g...	3
	2002 Chevrolet Tahoe LS 4.8L Power Door Locks VIN: 1GNEK13V22 Programing was not the issue, but I want to thank all who replied. I took a chance on the BCM and it corrected the problem. This is an awesome site. Ron	3
	2003 Chevrolet Venture Value 3.4L Poor Fuel Economy VIN: 1GBDX23E93 I cleaned the maf sensor and the throttle body. This brought the fuel mileage up from 20mph to 22mph. I am still concerned about the fuel trim numbers but I did find another problem. It did somewhere along the way set an evap code. I was checking that and I fo...	16
	2003 Chevrolet Trailblazer LS 4.2L MIL Lamp on, OTHER SERVICE LMPS VIN: 1GNDT13573 Thanks, you guys saved me a lot of looking! I received several good suggestions: faulty HVAC control head or stand alone computer, but 5 of you hit it on the head! Aran [...]'s quick check was the simplest and easiest to try. "Take the bottom of the steering ... Trouble codes: U1000 (Class 2 serial Comm. Problem), U1041 (Loss of EBCM/EBTCM Communications/with fan sw. on), C0379 (Front Axle Circuit Malfunction), B0790 (Transfer Case Neut. Indicator Circuit).	9
	2004 Chevrolet Impala 3.4L bleeding VIN: FGD1D3FG1F replaced master cyl. still unable to get pedal bought a vacum bleeder and that cured the problem. thanks for all the help veryone offered.	19
	2004 GMC Yukon SLE 5.3L a/c VIN: 1GKEK13Z34 Well folks, it's like this. I wish I could say that I fixed the problem with the intermitten hot air from the a/c but i didnt. The customer did not want to spend any money on this vehicle and decided that it was time to trade it in. I do appreciate all the kno...	17
	1996 Oldsmobile 98 Regency Elite 3.8L cruise control VIN: 1G3CX52KXT we are waiting for a more apparent problem to persist. we need it to act up on a more cosistant basis. ther is no sence replacing known good parts. so we are waiting untill a later date and hopefully it will become more apparent. thank you for all the help and...	5
	2001 Pontiac Aztek 3.4L hvac VIN: 3G7DA03E21 I was ready to try some of the things suggested by the knowledgable technicians of IATN. However we orginally looked at this vehicle on a Friday, released the vehicle back to the customer over the weekend and it has yet to return. Either it as started workin...	5
	2002 Pontiac Grand Am GT 3.4L MIL Lamp on VIN: 1G2NV52E82 Thank you everyone who answered my help request. Everyone who said to check for a broken wire at the IAT sensor, pat yourself on the back. I was able to stretch the tan wire at the connector, the wire was broken inside the insulation. I got the pig tail repair... Trouble codes: P0113.	9
	2002 Saturn SL1 1.9L starter VIN: 1G8ZH528X2 Thanks for the suggestions. Somewhere in the process of tracing all the wires, fuses and relays we got the vehicle to start and run. Tried appox 20 start/run/cycles and could not get relay to pop. Customer took car and will drive. Will report back with any...	4

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