× Auto Repair Pros Member Benefits TechHelp Knowledge Base Forums Resources My iATN Marketplace Chat Pricing About Us Join Industry Sponsors Video Members Only Repair Shops Auto Pro Careers Auto Pro Reviews
Join Now
International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for October 10, 2008
International Automotive Technicians' Network (iATN) - Members Only
(Also Available: All, Asian, Chrysler, European, Ford, GM.)
Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder.

Open Help Requests for GM
Help Request Answers
1989 Chevrolet Blazer Scottsdale 5.7L MIL Lamp on VIN: 1GKEV18K4K
intermittent code 43 esc module circuit, system works normally in stall and passes flow chart test and knock sensor,esc module and pcm have been replaced with no luck. wiring has been tested and no problems found. vehicle must be driven for short distance befo... Trouble codes: 43 (esc module circuit)
1994 Chevrolet Camaro 3.4L No Start, slow start VIN: 2G1FP22S0R
The only time this car gives us trouble is when starting. there have been no complaints of drivability problems other than the starting. Sometimes this car will start fine. When we have a problem with the starting it will spin and then drag really bad or it wi... Trouble codes: 36 (24X Signal Circuit Error)
1996 Chevrolet Blazer 4.3L No Start, hard start VIN: 1GNDT13W6T
was brought in with a hard start and a grinding when starting found flexplate bad fuel pressure was below spec. so we replaced flexplate and fuel pump it still has a hard/no start problem. No grinding now when crancking but it kicks back like it is firing at t... Trouble codes: P1345
1997 Chevrolet Blazer 4.3L Excessive Emissions VIN: 1GNCT18WOV
changed catalytic converter because it had fallen apart internally, also changed fuel injectors due to excessive negative fuel trims of -13.0% on both banks, after injectors and cat were replaced fuel trims were -3.0% both banks, let customer take vehicle. veh... Trouble codes: P0420
1998 Chevrolet K1500 Cheyenne 5.7L module VIN: 1GCEK14R7W
This truck will flash the ABS and brake light at 20-30 mph consistantly. When this happens you loose comm with the ABS module. Other modules are not affected. It will not set a code. Comms come back at 30mph. We have disconnected the rear vss and keep comms bu...
1999 Chevrolet C1500 Suburban 5.7L Poor Idle Quality, Hesitation, Stall, MIL Lamp on VIN: 3GNEC16R2X
Engine running rough at at idle and during acceleration,sometimes have to let off pedal to accelerate.Getting cam sensor codes,but not sure if that would make it run that bad or not.On occasion will run fine for a couple of miles leading me to beleive its not ... Trouble codes: P0340 (CMP sensor circuit), P0341 (CMP sensor performance)
2000 Chevrolet Impala 3.4L Starting VIN: 2G1WF55E6Y
The vehicle will die when the turn signal is turns on ( either direction ) and it will not start again. It looks like turning the emergency flashers on and off a few times will allow the vehicle to start. There is a buzzing noise in the flasher assembly before...
2002 Chevrolet Impala 3.4L lights VIN: 2G1WF55E12
this vehical came in from the auto auction with the headlamps hard wired to the switch bypassing the bcm/pcm etc...the wire harness for the headlamps was corroded so i replaced it.also the ignition doesnot always work at time the odometer will come on and at t...
2002 Chevrolet Venture LS 3.4L Power Windows VIN: 1GNDX03E62
Customer brings in very low mileage vehicle(35,000 miles) for intermittent problem with "POWER WINDOWS" not working. I have checked for Power & Ground at master switch (checked fine).You would think these windows would go up or down because I have power & grou...
2005 Chevrolet Venture LT 3.4L battery VIN: 1GNDV33E25
This van came in with dead battery. Checked & replaced battery, charging system ok. customer states that battery was replaced 4 times in the past. 4 days later battery dead again, checked battery & charging system again, ok. Checked for draw & let sit all day,...
2004 GMC Sierra 1500 SLE 5.3L transfer case VIN: 2GTEK13T04
customer states that he notice the auto four wheel drive light was on, so he pushed the 2 wheel drive button and he the vehicle went into 2 wheel drive. three days later the truck is in auto four wheel drive again so he pushes 2 wheel drive button and it goes ...
1993 Oldsmobile Cutlass Ciera SL 3.3L Excessive Emissions VIN: 1G3AM55N8P
we need help & ideas to pin point our nox issue. the nox readings are ranging from 150 - 1200. we havn't been able to tie this to any one thing other than temperature. all repairs completed this far have had little change in nox readings.not sure about spark a...
2001 Oldsmobile Aurora 3.5L mil VIN: 1G3GR64H21
Car came in with MIL on for an air injection fault, new rear shocks, and diag on a in-op master window switch. Fix the first 2 and backed the car off the lift to diag the master switch. Noticed everything on the door was dead. No gas release operation, trunk r...
1991 Pontiac Bonneville SE 3.8L No Start VIN: C5M1207486
customer has to jump car off after sitting over night,battery is dead,iac motor is working when key is off,you can hear it moveing ,hook test light up to battery its bright, un hook iac, test light is off. 2 weeks before he had problem with remoult start.it wo...
2000 Pontiac Grand Prix GTP 3.8L rear VIN: 1G2WR5212Y
Hello I have a 00 grand prix and when the customer sits at a stop she hears a bang sound like she was just rear ended but nothing car jerks little to. just replaced the struts, the bearings looked ok and the springs were ok to. everything is nice and tight can...
2001 Pontiac Aztek 3.4L Temperature gauge VIN: 3G7DA03E31
Customer complaint was car was running hot. I checked gauge then checked temp. at sensor with an infrared thermometer and temp. was between 200 - 230 degrees. I put Modis on and checked data stream, temp was between 200 - 230. I checked connections at back of ...
2004 Pontiac Bonneville SE 3.8L Steering Wheel VIN: 1G2HX52K3X
When turning the wheel in this vehicle you will intermittenly feel a short vibration that shakes the steering wheel violently. I have checked tie rods, ball joints, struts, bearings, and internediate shaft. All checked out fine. It is mostly felt on right hand...
2003 Saturn Vue 3.0L Misfire VIN: 5GZCZ53B63
This vehicle came to our shop about two weeks ago with the customer complaint that it feels like it is misfiring under a load and at idle sometimes. We scanned the computer for codes and checked the misfire data. The computer had Code P0304 in memory and misfi...

Fixes & Summaries for GM
Fix/Summary Answers
1988 Buick LeSabre Limited 3.8L Misfire VIN: 1G4HR54C3J
Thank you ALL for your help. This oldy but goody is back on the road. The FIX was a bad #5 injector driver in the ECM. Installed a GM reman and that was that. The fuel injectors, plug wires, plugs, module and the intake gasket were in good condition. Thanks fo...
1998 Buick Regal LS 3.8L No Crank VIN: 2G4WB52K3W
Thanks for all the helpful information, it turned out to be the ignition switch after all. found when you tap on housing the car starts right up, replaced switch and father in law is happy (not so much about the price though!). Thanks again
2002 Buick Regal LS 3.8L all ip warning lights VIN: 2G4WV55K62
thank you all for your help every singl one of you hit it right on the head the ignition switch was bad but I had to take care of buliton #03-08-45-004 that was to repair deformed or collapsed terminals in the bussed electrical center under hood the check for ...
2004 Cadillac DeVille 4.6L mirror turn signal VIN: 1G6KD54Y14
i found that the passenger door control module was the problem,and i appreciate everything that you guys sent me,and thanks again,
1991 Chevrolet R2500 Suburban Silverado 7.4L Speedo drops out and trans defaults to low VIN: 1GNGR26N4M
Haven't fixed this one yet but am convinced after all the great responses it's a wiring problem between the speed sensor and the DRAC module . I'll post the exact fix when it's done . Thanks IATN members , you rock !
1992 Chevrolet Motorhome 7.4L Mechanical VIN: 1GBKP37N8N
There are 3 different systems being used by GM in the late 80's to early 90s'. We had the system that operates off the steering pump. This steering pump runs the power steering, power brakes and parking brake system. We removed a leaking pressure switch, r...
2003 Chevrolet Trailblazer North Face 4.2L No Start VIN: 1GNET16S83
thanks for everyones help,I opened the wire harness from the pcm blue connector.found the orange + feed wire to the pcm corroded and broken internally.soldered and heat shrunk the repair.also found the grey wire broken at the same harness.had no blown fuses so...
2003 Chevrolet Trailblazer LS 4.2L ABS System VIN: 2GTEK19V81
The trailblazer came back in today. The customer had removed the ABS pump fuse so the brakes would act normally until it was fixed. After putting in the fuse I road tested the vehicle and the problem was not there when stopping straight! However when stopping ...
2006 Chevrolet Colorado LT 3.5L cylinder head VIN: 1GCDT13676
1995 GMC Jimmy SL 4.3L No Start VIN: 1GKCT18W8S
Thanks for all the advice, many replied of min. fuel pressure 61+ & coil/ distributor problems. After interrogating customer it turns out he was cranking engine w/the cam sensor loose. It is our conclusion the pressed on tigger wheel caught the sensor & moved....
1994 Pontiac Bonneville SSE 3.8L No Start, Cuts out, Stall, Poor Fuel Economy VIN: 1G2HZ5216R
good morning. ok...i THINK i fixed this ne this time. it's been gone for a week now, and according to my customer(when i called her 2 days ago, it's running great. i REALLY apreciate all of your guys suggestions and help. i had a couple suggestions t... Trouble codes: P1620 (qdm4 fault), P0341 (crank/cam error), P0342 (cam sensor ckt error), P0171 (system lean).
Prev (Also Available: All, Asian, Chrysler, European, Ford, GM.) Next