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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for November 3, 2011
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Open Help Requests for GM
Help Request Answers
2005 Buick Rendezvous CXL 3.4L Cruise VIN: 3G5DB03E05
We followed the flow chart for cruise inop and it lead up to replace the cruise module, which didnít solve the problem. We checked the 3 brake light switches and all the wiring from PCM to cruise mod and from the dash to the cruise mod, all seemed good. The li...
1987 Cadillac DeVille 4.1L MIL Lamp on, Cooling fans run VIN: 1G6CD5187H
Check engine soon light comes on intermittently. When this happens, the cooling fans will run and the scanner will not communicate with ECM or the BCM as long as the light is on. Cycling the ignition key off then back on restores the communication and turns of... Trouble codes: F32 (Loss of communication between ECM and BCM)
2004 Cadillac XLR 4.6L steering VIN: 1G6YV34A44
Checked archives and service bulletins found nothing on this problem.This car when sitting still and at times when turning a corner makes a clicking noise that sometimes is louder that almost sounds like a clunk,sorry it is hard to explain.Most of the time sit...
1979 Chevrolet El Camino 5.0L cruise control
i'm trying to fix cruise control. this car is in great shape. everything else works. it has new transducer, sevo wiper/cruise switch on colm. checked all wiring. i don't understand how it works. brake switch new also. it should be simplke. it only has two wire...
1986 Chevrolet C30 Custom 7.4L shifting VIN: 1GCHC34W3G
This post if for the auto tranny guys.I have seen this condition several times over the years on TH400 trans.Most people either don't notice or care.Customer recently bought truck to pull trailer with a tractor.When you first start out,trans shifts 1,2,3.When ...
1991 Chevrolet Corvette 5.7L Misfire VIN: 1G1YY2382M
Got this corvette in couple days ago.Customer complaining of an engine miss.He thinks on cyl#5 & #7.Well it is 5-6&7.Hooked spark tester up & has beautiful spark on all three cylinders.Dont have an injector pulse tool so hooked up pressure guage to rail to wat...
1996 Chevrolet K1500 Cheyenne 5.7L No Start, MIL Lamp on VIN: 1GCEK19R1T
Hello to everyone. PLEASE HELP!! For some reason I can't seem to get a handle on what could be wrong with this one.It takes 30-45 minutes to start truck just in the AM after which the truck starts and runs terrific the rest of the day!! Replaced bad fuel pump ... Trouble codes: P1351, P0430, P0141
1996 Chevrolet Camaro 3.8L Thermostat VIN: 2G1FP22KXT
I have a 1996 3.8 that is running cool (180-195) while driving down the road, but goes to normal temp (195-225) when in bay. I have replaced the thermostat 1st NAPA then STANT both with a 195 rating. Tested the CTS and found to be slightly out of range and rep...
1996 Chevrolet Cavalier LS 2.2L torque converter VIN: 1G1JF5246T
car has an abs code c1233,will this effect the torque converter lock up while cruising on highway,this thing will toggle on and off at 50 to 55 mph,
1996 Chevrolet Blazer 4.3L stays on VIN: 1GNDT13W2T
I have had this vehicle for some time and now I need to get this repaired. One man shop and it was easy to keep pushing this one back. It has been so long I do not remember what all I had looked at or tried other than removing the radio from the vehicle and th...
1999 Chevrolet Blazer 4.3L fuel and temp gauge VIN: 1GNDT13W0X
I have a regular customer who bought this 99 Blazer and he asked me to check his fuel gauge. I check it, and it jumps back and forth with key on. Does it running or not. Put trans in drive or any gear it is steady and accurate. Shut off vehicle, gauges all dro...
2003 Chevrolet Express 3500 6.0L Surge VIN: 1GBHG31U43
Vehicle has the non TAC throttle (regular throttle plate with cable). No codes set or pending in 6 mile road tests. Vehicle has heavy surge when under light to moderate accel from a stop or if accel from a slow speed like turning a corner. Will do it in drive ...
2003 Chevrolet Express 1500 4.3L Poor Idle Quality, Hesitation, Stall, Misfire VIN: 1GCFG15X23
hey everyone, i have a chevy express van with a 4.3l that came to the shop running rough and stalling. no misfire codes. fuel psi is good 65psi. static compression is 100psi. if you have the spark plug wires off of 2,4, and 6 all at the same time there is no d...
2005 Chevrolet Express 3500 LS 4.8L evap system VIN: 1GCHG35V95
vehicle came in with check engine light on. scanned vehicle and found code p0455 Evap system large leak. on this vehicle for some reason my scan tool does not support the vent solenoid test to turn it on. so we grounded the command side and hooked up the smoke...
2005 Chevrolet Silverado 1500 5.3L gauges,elec window,radio,door locks,charging VIN: 1GCEK19Z45
I was called to customer house to check out dead battery. Jumped and started, checked alternator, not working. Took off and had bench checked, not working. Had new one bench tested, Ok, installed. Only putting out 13.89 volts. Customer then told me the gauges,...
2010 Chevrolet Equinox LT 2.4L MIL Lamp on VIN: 2CNFLEEW9A
I have this 2010 Equinox AWD L4-2.4L that is direct injected. It keeps setting a P0172 Rich code. Watching fuel trims with the GDS 2 (MDI) it is showing between -15 and -25 at all times (Idle or off idle). The low pressure fuel system is showing 50ish psi both... Trouble codes: P0172 (Fuel Trim System Rich)
2011 Chevrolet Traverse LT 3.6L oil interval VIN: 1GNKRGED8B
i have a customer that just bought a new chev, brought in for routine oil change at 7704 miles. we used valvoline #955 full synthetic 5w30 that acording to valvoline bottle meets dexos spec. reset oil moniter to 100%. now with only 4500 more miles on,shows onl...
1988 GMC K1500 Sierra SLE 5.0L speedometer VIN: 2GTDK14H3J
hey guys and gals. need some help here. last winter after plowing i parked the truck. WELLLLLLLL. overnight the snow on the transmission turned to ice AROUND the transmission wiring. Morning comes and as soon as i moved, CRUNCH CRUNCH RIP RIP...a few blocks la...
2007 GMC Sierra 2500 HD SLT 6.6L coolant leak VIN: 1GTHK23667
vehicle came in to shop with coolant leak. pressure tested system will hold pressure cold and begins to leak after warm up. water dripping off bracket at power steering pump. cannot see back of pump.anyone have any ideas?
1965 Pontiac GTO 6.4L converter
I'm in the process of converting a THM400 to a variable pitch converter and stator. I have the pump, solenoid, input shaft &wiring etc. I did one of these quite a long time ago and remember it having a orifice cup plug either in the pump or pump mounting area ...
2007 Pontiac Solstice GXP 2.0L MIL Lamp on VIN: 1G2MG35X67
This little Solstice is one of my good customers "Baby" He has had it back to the dealer many times since it was new. He services regularly. This has been a recurring problem, now he's bringing it to me. I'd like to solve it. I have checked everything I can th... Trouble codes: P0300, P0301, P0302, P0303, P0304
2003 Saturn Vue 2.2L Emitions VIN: 5GZCZ43D03
car came with a hesitation problem sel light on and a viration under accelaration, unable to comunicate with ecm tried with snapon modis, solus, matco determinator and finaly launch none of them were able to access the ecm I replace the coil pack after chec...

Fixes & Summaries for GM
Fix/Summary Answers
1999 Buick Century Custom 3.1L Cruise Control VIN: 2G4WY52MOX
Got alot of good info on this one and although the customer did not want to spend the money to have the car repaired, I'm pretty confident of the problem. Most replied mentioned that the transmission MIL/code would cause the cruise to be disabled which would m...
2007 Buick Lucerne CXL 3.8L ABS Light VIN: 1G4HD57236
I would like to thank all those who have replied. The customer call about the light saying it only comes on about once a week, He's not worry about it now. I told him there is a tsb.and would like to see the car again but no luck. When it does come on he said ...
1974 Chevrolet Corvette 7.4L brake light on when pressing brakes VIN: 1Z37Z4S421
2004 Chevrolet Silverado 1500 LS 5.3L Will not take fuel VIN: 1GCEK14T64
2006 Chevrolet Colorado 3.5L front diff VIN: 1GCDT136X6
Thanks to all who replied, this one is now fixed. Special thanks to canrad for your quick reply. your post made me step back and look at the whole picture. got out a total system wiring diagram and saw the 2/4 switch and neutral switch on the transfercase. I a...
2006 Chevrolet HHR LS 2.2L steering VIN: 3GNDA23D06
I am going to call this "fixed" although I dont know exactly what did it, This was an intermittent problem and after checking all the grounds I could find,the loosest was on the engine by the starter,and removing and reinstalling fuses,I gave it back to the cu...
2006 Chevrolet Cobalt LS 2.2L No Communication VIN: 1G1AK55F96
After opening the wire harness from end to end and tracing the communication lines down and replacing both the pcm and trans module we would have communication while engine off, as soon as we started the vehicle we lost it in 10 seconds ,we unplugged trans and... Trouble codes: U0140, U0101, U0100.
2001 GMC Sierra 3500 SL 6.6L starter VIN: 1GTJK39101
I would like too thank everyone for the replies the owner had to take his vehicle and told us that this has been happening for a couple of years and did not have time too leave it with us he is not a local, I like the idea of putting a headlight in place of th...
2003 GMC Yukon XL 1500 SLE 5.3L MIL Lamp on VIN: 3GKEC16Z13
Replaced re-manufactured maf with factory new unit and customer has not been back with the light on. We test drove for several miles. Thanks to all who replied. Trouble codes: P0101.
1997 Oldsmobile Bravada 4.3L abs brake system VIN: 1GHDT13W1V
1997 Bravada Found information from all that replied usefull.Thankyou to the 2 Tech. that told me the line size I used was not a problem.The problem was air still traped in the ABS MODULE.I was not getting good flow out rear caliper bleeders. I had to block th...
2000 Oldsmobile Intrigue GL 3.5L turn signal VIN: 1G3WS52H6Y
Well this one is fixed. The problem turned out to be a short inside the headlamp assembly. Replced the wiring to and the turn signal socket itself and all is well. Thanks to all who replied.
1997 Pontiac Trans Sport 3.4L spark VIN: 1GMDX06E3V
Thanks to all who responded. The pigtail was shorting out on the exaust. We appreciate you and iatn.
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