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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for December 15, 2009
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Open Help Requests for GM
Help Request Answers
2000 Buick Century Custom 3.1L MIL Lamp on VIN: 2G4WS52J3Y
After 3-4 days of driving, these codes are set & find that the o2 heater fuse is blown. Replace fuse, clear codes & all is well for another few days. Looked for chaffed wiring, found tsb for harness rubbing on accumulator, but nothing there. Any common areas t... Trouble codes: P0133, P0135, P0141
1976 Cadillac Eldorado 8.2L control heat/cool VIN: 6L67S60202
has blower,but no timp.control
2003 Cadillac DeVille 4.6L no communication VIN: 1G6KD54YX3
customer states that windows were inop, dash inop, would not start or except jump start. customer replaced batt and was able to drive in. i found communication codes in all 19 modules. also found the positive batt lug was loose and screwed in on angle. i remov...
1974 Chevrolet Caprice Classic 5.7L engine compartment VIN: 1N47U4C106
hey guys,one of the painters @ the shop is building a caprice lowrider and asked me to help put it together.frame-off job 90% complete but im down to a box of wire,lots of bare ends (cut off)does anyone have an engine compartment wiring diagram so we can get t...
1990 Chevrolet C70 C7D042 7.0L Misfire, BACK FIRE VIN: 1GBL7D1E7L
this vehicle pops out the exhaust on decel between shifts, we believe that the air injections isn't working corrrectly but we don't have any information on how the system works. we are hoping that some medium truck shop has the electrical diagram and thr theor...
1994 Chevrolet G20 Chevy Van 5.7L cruise control VIN: 1GBEG25K3R
hey guys, having trouble with this 94 conversion van getting the cruise to operate. have tested every wire, replaced the speed sensor buffer as i had no square wave. have every power and ground,all sw signals from column sw and bk sw[lo and hi], determined eve...
1994 Chevrolet Corvette 5.7L Cuts out VIN: 1G1YY32P3R
vehicle starts then stalls in 2 to 3 seconds. the security light is on and there is no communication with MODIS. By mistake we left lights on overnight and drained battery completely, after recharge, vehicle started with no security light on and scanner was re...
1994 Chevrolet K1500 5.7L tcc lock-up VIN: 1GCEK14K5R
first of all let me say im not a trans.tech now this truck belongs to my son he's had for about 2 years when he bought it it is a 1994 truck on a 1989 chassis [origanaly a 350 tbi with a 700r4}after the 700r4 was rebuilt 3 times once by me and a trans tech f...
1997 Chevrolet K1500 5.7L complete system VIN: 2GCEK19R3V
Hello all, Sorry for the long post but, this is a toughy. Ie; excessive brake pedal travel. 1997 Chevy K1500 Zl7 4x4 off road, 5.7 vin R w/ 3 CH ABS. Not 4WAL abs. Cust. put engine oil in Master Cyl. Towed in/ I never drove it. Replaced Two master cyls, two se...
1998 Chevrolet K1500 Cheyenne 5.7L Cuts out VIN: 1GTEK19R1W
First of all, sorry for the long post. Customer concern is that if engine is started and driven immediately it has no power and cuts out. If you let it run for a few minutes it runs fine. The "Service Engine Soon" light is on all the time with the codes listed... Trouble codes: P0171 (Fuel System Lean Bank 1), P0174 (Fuel System Lean Bank 2), P0161 (HO2S Heater Circuit Bank 2 Sensor 2)
2000 Chevrolet Blazer LS 4.3L MIL Lamp on VIN: IGNCS18W3Y
have a p1345 code, have checked distributor at tdc and the button is pointed at the 6 on the housing. it idles good. have moved the distrbutor and still the same code.this is the edi ignition system. Trouble codes: P1345
2000 Chevrolet Silverado 1500 4.3L Poor Idle Quality, Hesitation, Surge, Cuts out, Stall, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GCEC14W6Y
This truck has got me at a loss, came in after he went into a ditch, nothing major but customer says truck ran like shit after hitting the ditch. First test drive showed misfires on all cylinder with 6 being the worst and sometimes up to 33000 counts. I went t... Trouble codes: P0300 (Random Cylinder misfire)
2002 Chevrolet Express 2500 5.7L No Start VIN: 1GCGG25R12
van came in on hook will not run checked it out no codes, it would back fire and carry on like it was out of time and not start, found cap in bad shape, replaced cap and rotor still same thing, replaced coil still no help, replaced plugs and it fired up but wa...
2003 Chevrolet Silverado 1500 HD LS 6.0L Stall VIN: 1GCGC13U63
Vehicle stalls going down road 5 times in 2 months. 1) Drove 50 Miles coming to a stop in a 25mph zone. Restarted after 2 minutes. FP=40 psi. 2) Drove 40 Miles no acceleration. Engine did not respond to throttle at all. Turned truck off and restarted and every...
2004 Chevrolet Silverado 2500 HD 6.6L mode door VIN: 1GCHK29224
greetings to all got this pick up in today from another shop,they were trying to install anew mode door actuator located on the left side of the heater box,after several trys they asked if i would do it.im looking at this and im not sure what position the whit...
2005 Chevrolet W3500 Tiltmaster W3S042 6.0L Hesitation VIN: 4KBB4B1U64
customer complaint is, they press the accerator pedal and nothing happens. this an intermittant problem with no codes. we can not get the vehicle to act up and all powers and ground are good at the pedal and module. any help would be very much appreciated.
2005 Chevrolet Trailblazer LT 4.2L Misfire VIN: 1GNDT13S15
this blazer came in with missfire complant,we scand and retreved random misfire ,engine not to temp.codes we have replaced the spark pluges ,coil boots.tstat .still have randon missfire every couple of days .is thear somthing commen to 4.2l gm motors
2002 GMC Sierra 2500 HD 6.6L Surge, Misfire, MIL Lamp on VIN: 1GTHK23172
Hello, to all this duromax starts missing when it hits 56c cyl bal for #6 goes to =15.0 1.86ml sec. also noticed #5 at =5.5 .93ml sec. Im about to pull the drivers valve cover and inspec the lines and fitting for leaks what else should I look for , shy of repl... Trouble codes: P0306
2000 Oldsmobile Intrigue GL 3.5L No Start, No crank VIN: 1G3WH52H1Y
Bear with me, this is my first time posting. I have a 2000 oldsmobile intrigue that was towed in for a no crank condition. I installed a test jumper between starter relay and fuse box. I am getting power from ignition switch to relay coil and power from 40 amp... Trouble codes: B3102
2001 Oldsmobile Alero GLS 2.4L No Start VIN: 1G3NL52T41
Sorry for the long winded post!We have an Alero with an odd problem .This car first came to us with a no start. We towed the vehicle in and it started right up. When we were talking to her about what happend she told us she has had the fuel pump replaced by GM...
1996 Saturn SL2 1.9L MIL function VIN: 1G8ZK5272T
Hello Techs. I have a Saturn here that & think may have 2 issues. Main concern is that intermittently when the key is cycled to the "on" position the MIL will not come on. For this reason the emission test center will not test it. The second concern is when I ... Trouble codes: P0341
2005 Saturn Vue 2.2L SES light on VIN: 5GZCZ33D45
SES light is on, no other problems exist. No codes present in dealer specific, but in generic mode, B1849 comes up, described as a dealer specific code. Alldata and Mitchell claim that code doesn't exist. Dealer says code doesn't exist. Code will not clear, ev...

Fixes & Summaries for GM
Fix/Summary Answers
2000 Buick LeSabre Custom 3.8L Accessories VIN: IG4HP54K0Y
ok heres what i found. i had all ready checked the wires in between the doors and body.after receiving wiring diagrams from Austin i figured problem was in circuit 2076 tan-white wire. bus interface. to confirm, I ran a wire from tan & white wire, connector ...
2001 Buick Regal LS 3.8L No Start, Cuts out VIN: 2G4WB55K11
Well this one is out the door. After tracking down numerous groungs and assuring they were all good went to check out the ignition switch. Popped the little cover off the bottom of the switch and there were all the wires. Checked for juice and found only 7 vol...
2005 Cadillac STS 4.6L power assisit VIN: 1G6DC67A15
Thanks Guys: I put a new GM rack in and it solved the problem. He said that a body shop had replaced the rack about a year ago with a rebuilt one. Thanks again
2000 Chevrolet Astro 4.3L awd VIN: 1GCDL19W9Y
Ok well it seems somtimes I take the long road but it turned out that the transfercase was bad, clutchs slipping in both the astro and the bravada got a good education on how the whole sys works next one will be really simple. Replace with used cases and the w...
2001 Chevrolet Express 3500 5.7L abs VIN: 1GCHG35R01
Thank you to those that responded. I have completed the fix on this van after getting AC Delco involved. Problem with the abs system was the power and ground wires. I was getting an active good ground and 12v but there was still a fault in the circuit. A new p...
2002 Chevrolet Impala 3.4L contaminiation of cooling system VIN: 2G1WF52E52
THANKS Gang! I apprecaite all the input and advice. The customer stopped by yesterday and from talking to some other people was wanting the intake gaskets replaced, We set somthing up for late this week, calls me this morning and tells me do not do any furhter...
2005 Chevrolet Colorado Z71 3.5L electric windows VIN: 1GTJDT1362
thanks to all replyed.flashed the bcm all is well.what else are they going to come out with lol,again thanks all
2005 Chevrolet Tahoe LT 5.3L Tire Pressure monitor VIN: 1GNEK13T75
Hey fellow techs, I really appreciate all the information given. Seemed so simple. Here's what I did...I tried to reset the sensors again with the LR by the passenger door to see if maybe it had a weak signal. Again the LR did not relearn. Then I let it rest f...
1990 GMC C7000 Topkick C7H042 7.0L Hesitation VIN: 1GDP7H1MXL
thanks to all . i was unable to find the spec for fuel pressure. it was 16 psi with the old pump 32 with the new fuel pump. thanks again to all who responded. the truck runs great. Trouble codes: 44 (lean exhaust).
2004 GMC Canyon Z71 SLE 3.5L tcase VIN: 1GTDT13604
repair broken wire reprogram encoder motor for neutral
1997 Oldsmobile Silhouette 3.4L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GHPU06EV5
So I scope the crank sensor and the patter was good. So I ended up pulling valve cover on front bank and cylinder 4 Valve spring was broken I gave the customer a quote & he said it was to much he was going to trade it in. yeah right. anyway thanks for all your... Trouble codes: P0300, P0304.
2001 Oldsmobile Alero GL 2.4L No Start, Misfire VIN: 1G3NK52T11
Thanks for all the replies! Problem turned out to be defective new coils. We installed oe coils and have 200 miles on car and all is good.
2002 Oldsmobile Alero GL 2.2L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G3NK52F32
Thanks to everyone how sent in imformation. The owner decided to take the car to the dealer and the dealer stated that the chain was ONE tooth off. It is had to believe that this was caused by one tooth. So I guess I have to take take there word on this. Thank... Trouble codes: P0300.
1996 Pontiac Grand Am SE 2.4L No Start VIN: 1G2NE52T3T
Thanks to everyone that replied. I really appreciate the response. What a great site! I replaced the pcm with a used one. The dealer said it had to have the exact service number. I got one that did, still did not fix the car. Same problem. Start and die. I ... Trouble codes: P1629.
2001 Pontiac Bonneville SLE 3.8L Cuts out VIN: 1G2HX54K51
Well the car came back last week after replacing a 3rd maf sensor-however the codes were all MAP sensor codes and the map sensor was out of spec-since the pcm uses the map to diag the maf I assume this will fix the car-I replaced the map last week and so far s... Trouble codes: P0101 (maf sensor).
2000 Saturn SL 1.9L Poor Fuel Economy, MIL Lamp on VIN: 1G8ZH5287Y
First, thanks to all who replied. The majority of you pointed me to the ECT sensor, which I neglected to tell you all that I changed. Turns out that this was a real strange one. It was obvious that the engine was being over fueled, but the tailpipe 5 gas... Trouble codes: P0172, P0410 (secondary air sys flt), P0303 (misfire cyl 3).
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