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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for September 23, 2010
International Automotive Technicians' Network (iATN) - Members Only
(Also Available: All, Asian, Chrysler, European, Ford, GM.)
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Open Help Requests for GM
Help Request Answers
1996 Buick Regal Olympic Gold Edition 3.8L Hesitation, Stall VIN: 2G4WB52K3T
vehicle was brought into the shop for lack of power and somtimes would not start. ran basic checks and found had low fuel pressure and when volume was checked, engine died. had to cycle the key about 6 times to get pressure to build up. removed fuel tank and r...
2002 Buick Rendezvous CXL 3.4L Differential VIN: 3G5DB03EX2
Vehicle came in with broken rear springs & noise in rear diff. replaced springs & changed fluid in diff w/ gm versatrac fluid per bul . vehicle didnt feel right on test drive (feels like stuck in awd ),after 5 miles awd disabled message came up & the ride was ...
1984 Cadillac Fleetwood 6.0L No Start, Stall VIN: 1G6AW6989E
Vehicle came to the shop with an intermittent stall or no start we check the vehicle and we couldn't verefy the complaint. Untill we left the vehicle out in the sun on a hot day. It was when we notice no spartk and no injector pulse, and sometimes spark ok and...
1997 Cadillac Catera 3.0L TCM Internal Error VIN: W06VR52RV4
I have tested the power and ground circuit's using a halogen headlamp as a load. If I erase both codes P1625 returns immediately without cycling the key. There is no voltage output on circuit PF754 Power relay output pin 54.The trans shop took the car back and...
2003 Cadillac CTS 3.2L MIL Lamp on VIN: 1G6DM57N73
Customer brought car in with check engine light on. I scanned vehicle found codes: p0160 low 02 sensor activity b2s2 and p0161 heater circuit b2s2 problem. I observed freeze frame data. All looked normal. I cleared codes and test drove vehicle. codes came back... Trouble codes: P0161 (Oxygen sensor heater circuit b2s2 fault), P0160 (Low oxygen sensor activity b2s2)
2005 Cadillac STS 4.6L No Start VIN: 1G6YV34A45
I replaced the fuel pump on this car about a month ago. When the car came in the fuel gauge read 3/8 of a tank and the fuel pump was not running. I dropped the tank and found that the bucket had broken off of the bottom of the fuel pump hanger and was laying o...
1989 Chevrolet Cavalier 2.0L Cuts out VIN: 1G1JC5115J
Hey techs! Hope you can help me with this headache. 89 Cavalier suddenly died and would restart but only run for 2 seconds and die again. Over and over. Has new fuel pump, relay, Crank sensor, Ignition control module, oil pressure sender, tried a different ECU...
1991 Chevrolet Caprice Classic 5.0L Stall VIN: 1G1BN53E3M
Hi guys, I am a tech at a Dodge, Chrysler, Jeep dealer & am working on a Chevrolet for a friend of mine. It very intermittently dies at idle when put in gear, mostly when put in reverse but has died once for me when put in drive. I set the minimum idle speed b...
2002 Chevrolet Trailblazer LS 4.2L Ignition VIN: 1GNDT13SX2
Fellow techs, This Trailblazer came in on the flatbed yesterday. The customer said she went to start it and all the lights came on, but the starter wouldn't run. After not starting, she was unable to turn the key to the off position to remove it. This was to ...
2003 Chevrolet Impala 3.4L engine VIN: 2G1WF52E83
Car will not crank over or start. Will not communicate with bcm.Would like to know if shift interlock will cause a no crank situation or bad bcm will cause it. Only code available is U1000.
2004 Chevrolet Malibu LS 3.5L MIL Lamp on VIN: 1G1ZT628X4
I checked the exhuast for leaks and the muffler does have a leak at the seam. And I don't understand the map pids reading only 10 hg. when my vac gauge tells me theres a normal 17hg. I'm sorta befuddled has any body come across this problem befor? Looking for ... Trouble codes: P0401 (EGR insufficiant flow)
2004 Chevrolet Colorado LS 3.5L Brakes VIN: 1GCDS13684
Customer brought in truck after he replaced pads+rotors+calipers because of wearing them away grinding.said he ran master dry,after, re-assembling he bled for hours and could not get a good pedal.we checked for leaks, vaccum bled, pressure bled, manual bled, c...
2006 Chevrolet Tahoe LT 5.3L No Start, Stall, MIL Lamp on VIN: 1GNEC13Z56
Engine stalled after accelerating, Has PCM failure code, installed another computer and programmed it and all was good till we tried to drive it, Pressed the gas it started to rev up and reduced power came up on dash and engine stalled, Same P0606 internal fai... Trouble codes: P0606
2007 Chevrolet Silverado 3500 HD LT 6.6L Pto Shift VIN: 1GBJK34607
Thanks techs!unit will not engage pto,had done the gm relearn/idle up([...])18step,and reflash, then did learn the idle up,, then lost pto engagement,contacted gm tech service(it's a gmupfitter unit.aftermarket but still gm ) and gmupfitters did'n...
1998 Oldsmobile Bravada 4.3L Lighting VIN: 1G2WERF8NH
No dash lites,checked fuses ok,all exterior lites work fog lites work, this suv has all the bells and whistles, drl,auto lites that turn on at dusk.thinking might be in the head lite dimmer switch but have no electrical diag. were is the power supply feeding 1...
2003 Oldsmobile Alero GL 2.2L Cranks, No Start VIN: 1G3NK52F03
Intermitent no start. Recent fuel pump replaced. Hasn't resolved issue. Fuel pressure good. Spark good. Vehicle came in had prolong cranking before it starts when hot. Checked fuel pump relay good. Next day, starts when hot and cold. Any help would be apprecia...
2000 Pontiac Sunfire SE 2.2L abs module VIN: 1G2JB1248Y
this car cam in from auction with abs,trac off, and service wrench light on. old snap on brick showed rr abs open or short. replaced rr hub with no change. replaced abs module with a used on and got both rr and lr abs short or open . the wires from the module ...
1999 Saturn SL 1.9L Door chime VIN: 1G8ZJS274X
Can anyone tell me the location of the chime module it is a suspect on a battery draw. Pulled "body" fuse draw was gone radio keyless enter and chime are the only things fused by that one. the radio is un plugged and the chime quit 2 weeks ago so i need to kno...
2002 Saturn Vue 3.0L Heated Seat VIN: 5GZCZ63404
Above mentioned vehicle arrived at our shop with the customer complaining of the drivers seat heater not getting hot. Confirmed complaint, no heat within drivers seat. After testing the the usual suspects, (switches, ground, power, etc,) and conferring with th...

Fixes & Summaries for GM
Fix/Summary Answers
1999 Buick Park Avenue 3.8L MIL Lamp on VIN: 1G4CW52K7X
this one hasnt come back yet but i am still not convinced the last time it took 3 months for it to come back. most mentioned that when refueling the customer should not over fill the tank. you know clicking the gas pump alot. i basically replaced the soleno... Trouble codes: P0442, P0440.
2002 Buick Park Avenue Ultra 3.8L proportioning valve VIN: 1G4CU541X2
i would like to thank Alex for his usefull information. the car had new coopers on the rear and goodyears on the front. even though the goodyears had good tread swapping them for matching coopers solved the issue. thank you again
1990 Cadillac Eldorado Biarritz 4.5L Excessive Emissions, MIL Lamp on VIN: 1G6EL1335L
Thank you to everyone that took the time to help. You guys had some very use full information. One of the egr ports was clogged up. cleaned it out and the vehicle is working great. Thank you fellow IATN members. Trouble codes: E046.
1999 Chevrolet C1500 Suburban 5.7L brakes VIN: 1GNFK16R7X
All the techs that pointed at the ABS and especially the ones referencing the front hubs as a rust issue were spot on. I replaced one hub and had to get the truck off the lift while waiting for the second one to arrive. When pulling back on the to hoist I ...
2001 Chevrolet Tahoe 5.3L rear defrost VIN: 1GNEK13T21
Thanks for all the replies everyone. It's awesome to have so many experienced pros out there as go-to guys. Everyone nailed it. The ground side of the circuit was open. Just for referance the ground side is on the drivers side. I used my power probe and a jump...
2004 Chevrolet Monte Carlo LS 3.4L Ignition Switch
1996 GMC K1500 Sierra SLT 5.7L Differential VIN: 2GTEK19R9T
the customer is still came back and told us it performs fine out in the dirt so i guess we all learned something new about "four wheel drive" thanks for everybodys help
2003 GMC Sonoma SL 4.3L Electronic VIN: 1GTDT19X93
Hey guys, sorry about this one: my tech did not warm engine enough after installing the control head, which is the controller unit (no separate brain on these). So the blend door actuator had shorted out and damaged the control head.
2003 GMC Yukon SLT 5.3L transfercase actuator motor VIN: 1GKEK13T93
First of all, the initial problem was when veh. was started, the 4x4 switch on the dash would lite up 2H and 4L at same time, or auto4wd and 4h, etc. You'd have to turn ign. off/on, and move gear selector until finally you'd get 2h. The switch is new. To re...
2005 GMC Safari 4.3L No Start, Stall, start and stall VIN: 1GTDM19X05
well i finally figured this one out boy what a doozie. it was strange because the engine would crank and run but just for a second. i had a spare [good used] injector spider so i plugged it in to fuel and power and found that the injector spray would stop aft...
2006 Other GM 7600 8.0L A/C clutch VIN: 1HTWYAHR36
I received 2 replies for this post. Glenn [...] was not near his vehicle but discribed the procedure almost corretcly. To reset the dash and turn the a/c back on after repair, the A/C Service light in the dash must be reset. To do this turn the key to the on...
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