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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for March 5, 2013
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Open Help Requests for GM
Help Request Answers
1993 Buick LeSabre Custom 3.8L Stall VIN: 1G4HP53L6P
This car originally came in as a no crank problem. found the ignition switch was the culprit and replaced, had the correct resistance value for the key pellet. After this repair the car will start for about a second then the injectors shut down. The original c...
1996 Chevrolet Tahoe LS 5.7L lack of power VIN: 1GNEK13R0T
lack of power sometimes dosent matter speed 20 mph to 80 mph.hot ,cold no codes runs fine most of time, fuel trims lt +3 to -3 st -2 to +5. when running good. all of sudden lacks power fuel trims lt +30 st +40 still no codes when it happens,will do it maybe 3 ...
1997 Chevrolet Tahoe LS 5.7L No Start, Stall VIN: 1GNEK13R4V
thank you all for looking this vehicle was towed in for a no start found no fuel pressure replaced fuel pump and filter all good customer picked it up worked good for a month then had vehicle towed in for no start when i went to push vehicle in it fired right ...
2001 Chevrolet Blazer LS 4.3L Hesitation, Surge, MIL Lamp on VIN: 1GNCT18W81
Hey GM techs out there! This Blazer is kicking by butt! Customer brought the vehicle in for hesitation and surge problem. Had codes for almost all the cylinders, and the random misfire. Other tech before me diagnosted it as a bad crank sensor. He read some inf... Trouble codes: P0300 (Random Misfire)
2002 Chevrolet Silverado 3500 6.0L fuel gauge VIN: 1GBJC39U22
we have replaced the instrument cluster and the fuel pump.it is showing fuel gauge is reading empty but the low fuel light is on dont know what else to try.
2004 Chevrolet Trailblazer LS 4.2L MIL Lamp on VIN: 1GNDS13S44
Truck came to the shop knocking,we installed jasper engine,engine runs fine,but now we have mil light on and code po0016 cam/crank correlation problem.eng has good power and runs smooth.Tested voltage to solenoid with key on 12-13 volts goea away when we conne... Trouble codes: P0016, P0013
2004 Chevrolet Silverado 2500 HD 6.6L Instrument cluste VIN: 1GCHK23294
Good evening, Comes in with battery light on and message displaying "battery not charging". Volt meter in dash says 14 volts. Alternator output at either battery is 14.7 volts. Grey wire at back on altenator is showing a duty cycle. Brown wire has .77 volts ko...
2007 Chevrolet Silverado 1500 LTZ 6.0L Cylinder 1 Lifter VIN: 2GCEK19Y07
Vehicle came in for various driveability symptoms such as misfire at idle and under load, surge at idle, and check engine light on. Only DTC was P0300, random cylinder misfire. A check of the misfire counter and history showed some counts on all cylinders, but...
2007 Chevrolet Silverado 1500 WT 5.3L MIL Lamp on VIN: 3GCEK13387
Bank 1 and 2 read rich mostly at idle LT -8 MAF 4.9-5.5 @idle. Reset fuel comp and trim, cleaned maf no change. fuel pressure good air filter good cleaned throttle body Trouble codes: P0175, P0172
2007 Chevrolet Silverado 2500 HD LT 6.6L No Start, Stall, MIL Lamp on, Lacks Power VIN: 1GCHK23627
Hoping some good GM Diesel techs/ experts have run into this problem before and know the fix. We have sunk $1200 into this truck 3 months ago and she has not had any trouble over that time period. Now the problem has occurred again after shutting off and going... Trouble codes: P0191 (Fuel Rail Pressure sensor out of range)
2008 Chevrolet Silverado 1500 WT 5.3L RF Brake pads VIN: 1GCEK19JX8
Cannot explain why RF pads wear 3-times as fast as LF. No visual problems, no caliper mounting, hardware or pad sticking issues, hydraulic pressure relieves upon pedal release & caliper slides are lubed/free to allow equal amounts of rotor free spin (no drag)....
2012 Chevrolet Silverado 1500 LS 4.8L Pcm bcm VIN: 1GCRKREA7C
Have a customer with the above mentioned truck wanting to know if we could activate the factory remote start system on his truck? is it a matter of just getting a factory Key Fob ( with start button),Or is more needed ... P.S. customer does not want any afterm...
2002 GMC Sierra 1500 SL 5.3L Misfire VIN: 1GTEK19T52
Truck came in today and the customer complaining about a "hiccup" between 48-52 MPH on the highway. Test drove felt like misfire, although no codes stored in computer. replaced plugs, wires,fuel and air filters. test drove truck again and at about 52 MPH on th...
2000 Oldsmobile Alero GL 2.4L Cooling Systems VIN: 1G3NL52T3Y
Vehicle sat for like a year or two, he brought it to the shop because water pump was leaking. Replaced water pump and thermostat, double checked timing was correct put it all back together and started up. Started right up fine ran good but after a while the ti...

Fixes & Summaries for GM
Fix/Summary Answers
1996 Cadillac DeVille Concours 4.6L MIL Lamp on VIN: 1G6KF5294T
Well all good suggestions...Thank you! I really could not see putting another MAF on this vehicle. I really felt mechanical issue as suggested. I choose to use the FLuke PV350 on all cylinders. Cylinders 3 & 5 showed an erratic spikes (compression was good) (P... Trouble codes: P0171 (Fuel Trim System Lean Bank1), P0174 (Fuel Trim System Lean Bank2).
1968 Chevrolet Chevelle Malibu 6.5L Vent VIN: 138678B166
Wow! There ara alot of Chevelle guys out there. Thanks so much for4 all the good vendors. I have found everything I need to finish this job and more. Again. Thanks to all. Regards Brad
1984 Chevrolet C10 Scottsdale 5.0L MIL Lamp on VIN: 1GCEC14F7E
Thanks for all the replies. Got alot of laughs. We couldnt determined if we truely had a problem with the cluster or icm side. Customer wanted the system to work like it was factory. We ran out of time, he needed the truck back. Customer well bring the vehicle...
1999 Chevrolet Tahoe 5.7L Poor Idle Quality, Hesitation VIN: 3GNEK18RXX
Hey guys, thanks for all the help. Turned out to be a fuel pressure regulator that was just slightly weak. The running pressure was 58 psi, and 60 koeo. Started restricting the return line to increase pressure a couple of pounds and everything straightened out... Trouble codes: P0171 (System lean bank 1), P0172 (System lean bank 2).
2000 Chevrolet Venture 3.4L Cooling fans VIN: 1GNDX03E7Y
Thank you for the help. The gauge in the cluster was bad. It was reading high by about 1/8 to 1/4 which is Why I was thinking it was overheating before the fans turned on. All the other gauges were reading correctly. Thank you again for the replies.
2005 Chevrolet Cobalt 2.2L 1-2 shift VIN: 1G1AK52F95
thanks fellow tech tcm had too be flash with tech 2 flashed and vechile runs great thanks for your help
2005 Chevrolet Cobalt LT 2.2L No power, wont rev VIN: 1G1AZ52F75
Thank you to everyone who replied.. The actual problem boiled down to the exhaust cam had jumped 2 teeth off. Thank you to everyone who helped on this. This was one of those nightmares that once you get it figured out it makes sense, but until you find the pro... Trouble codes: P0101 (Maf), P0106 (MAP or BARO out of range), P0068 (MAP/MAF Throttle Position Air Flow Corrolation).
2007 Chevrolet Suburban 2500 LT 6.0L Cuts out VIN: 3GNGK26KX7
Thanks to all who replied, it was all very helpful. We ended up finding a wiring harness back by the front drive shaft that had rubbed through. It was at the rear of the front shaft, by the transfer case. There was a 5 volt ref. wire that had rubbed through an... Trouble codes: P0335.
2007 Chevrolet Malibu LS 2.2L Chmsl VIN: 1G1ZS58F37
Update/Fix Narrowed it down as I stated to a under hood fuse box problem, customer wants cheap so junkyard fuse box was located and installed. Vehicle is fixed and out the door! Customer is happy with price and has decided to purchase four new tires for the ...
2008 Chevrolet Tahoe LTZ 5.3L Noise VIN: 1GNFK13018
I beleive Bill nailed this one on the head. Upon driving it I finally got the squeal to happen and it was in the rear which we had also done brakes on, It had new antirattle clips but the pads did not fit very tight on the slides. We ordered up another set and...
2008 Chevrolet Express 1500 4.3L No Start VIN: 1GCFG15X18
Sorry to be so long closing , but owner couldn't spare it to get it back .Van finally ended up going to dealer who guess what couldn't find the problem either. My best information says they want to try a bcm. Not sure if that will solve it.I believe the proble... Trouble codes: P0116, P0300 (Multiple misfire).
2002 Oldsmobile Silhouette Premiere 3.4L No Start, MIL Lamp on VIN: 1GHDX03E72
Looks like a oil soaked crank sensor was the problem. Could not tell how bad it was until crank pulley was removed. Van has run fine for four days. Many THANKS to the one who referred me to scanner danner on youtube. Thanks to all who shared information! Trouble codes: 336 (24x crank sensor).
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