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Prev Professional Automotive Repair Technical Discussions for October 3, 2013
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Open Help Requests for GM
Help Request Answers
2002 Chevrolet Malibu 3.1L Mechanical VIN: 1G1ND52J42
Vehicle was overheated, customer said she shut it off before it got into the red, she had it towed to her home and it sat in her garage for about 2 years. She then sent it in to have it repaired, failed block test and water pump leaking, we repaired heads,(mil...
2003 Chevrolet Tracker ZR2 2.5L No power VIN: 2CNBJ73473
Customer came in complaning of rattle noise in engine, and said when the oil was changed a screw driver had to be stuck in the drain hole to get oil to flow. Told customer noise was from chains and it may be do to sludge, recommended pulling valve covers to ch...
2003 Chevrolet Tahoe LT 5.3L temp/blend door VIN: 1GNEK13ZX3
03 tahoe,customer complaint when you change temp control from 90 degrees to 89 degrees temp changes to full cold.verified complaint,happens every time.tried recal.head unit n.g.fuses o.k.,had one code for recirc.actuator.replaced now code and works prope...
2004 Chevrolet Silverado 1500 LS 5.3L Unknown VIN: 2GCEK13TX4
I am asking for help as this truck has a scraping noise that almost like clock work comes on at 50mph. If you put the transfer case in auto mode 4wd and drive it the noise does change when you command it in and out. I have installed a used low mile complete di...
2005 Chevrolet Silverado 2500 HD 6.6L power steering VIN: 1GCHK232X5
Customer complaint is steering stiff when making slow speed parking lot maneuvers. Truck is lifted with oversized tires. The truck has been steering fine for two years. Confirmed customer complaint truck will not turn unless moving. Wont turn at all when brake...
2005 Chevrolet Express 2500 4.8L Aux Outlet VIN: 1GCGG25V65
I'm trying to diagnose a 05 chevy express 2500 4.8l that keeps blowing fuse #30 for the aux outlet. It blows the fuse evey week sometimes up to two weeks. It will occationally blow fuse #29 for the driver side aux outlet but it has only blown that one 1 time i...
2006 Chevrolet C4500 Kodiak C4U042 6.6L No Start VIN: 1GBE4V1296
Posting this for my boss. This is a county transit bus. Apparently they feel the need to use up some tax money before end of year. Installing new engines and transmissions in the buses. Our shop has been doing the injector relearn procedures on these as they b...
2010 Chevrolet Cobalt LT 2.2L MIL Lamp on VIN: 1G1AF5F56A
I have an 2010 Cobalt and intermittently while driving down the road the odometer and speedometer bounce back and forth, along with all the warning lights coming on, and radio come on and off. Mil is on when in come into the shop, but now is off. It have a His... Trouble codes: U0073 (Control Module Communication BUS off), P0700 (Transmission Control System Malfunction Indicator Lamp Request)
2005 GMC Envoy SLE 4.2L Rear axle VIN: 1GKCT18X25
Good day poeple. I have this 05 Jimmy with a vibration starting at 100 KPH then just keeps getting worse as speed increases. I have an EVA (electronic vibration anyalses machine) which indicates a first order tire vibration. This tells me that the vibration is...

Fixes & Summaries for GM
Fix/Summary Answers
2004 Cadillac Escalade 6.0L high fuel pre. VIN: 1GYEK63N54
thanks for all the help.i will be puting in a new pump unit and see how it works.
1996 Chevrolet G30 Chevy Van 5.7L transmission VIN: 1GCGG35K5T
We replaced the transmission with a used unit and it fixed the problem. Thanks again for all who gave there ideas!!
2003 Chevrolet Trailblazer North Face 4.2L MIL Lamp on VIN: 1GNDT13S63
Thanks for all the replies with such good information. Since my scanner is out for repair I went thru the basics. Changed oil, check the wires and all seem good. So I decide to put a new cam sensor which is cheap and easy to change!!! Definitely worth the try!... Trouble codes: P1345 (Cam/ckp correlation).
2006 Chevrolet Aveo LS 1.6L Hesitation, Cuts out, MIL Lamp on, MIL flashing VIN: KL1TD66626
Replaced the coil, All issues went away. Very curious that there were no visible misfires when watching the misfire monitor, nor did it feel like a standard misfire upon arrival. Timing was dead on. The "coolant degassing valve" was a little sticky, a little b... Trouble codes: P2680 (description unavailable), P0300, P0301, P0304.
2007 Chevrolet Avalanche LTZ 5.3L Auto 4wd VIN: 3GNFK12367
2004 Hummer H2 6.0L Check engine light VIN: 5GRGN23U14
Hi and thanks for the help. We ended up running a fuel flush to clean the injectors. so far the truck has not had any problems. That was two weeks ago. thanks again
2005 Pontiac G6 GT 3.5L Brake Lights VIN: 1G2ZH52875
Ok guys, this one is fixed and out the door. Most replies were correct in saying that the brake pedal position sensor had to be recalibrated in order for the brake lights to work properly. One question I have is what was wrong with the simple two wire push but...
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