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Prev Professional Automotive Repair Technical Discussions for January 13, 2014
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Open Help Requests for GM
Help Request Answers
1998 Cadillac Eldorado ETC 4.6L Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1G6ET1296W
The head gaskets went out on this car last December (2012), I pulled the engine and trans and started disassembly of the top end but did not pull the heads but I had some unrelated issues that caused me to let it sit until last month. I finished tearing it dow... Trouble codes: 0300 (Random misfire multiple cylinders)
2004 Cadillac CTS 3.6L door locks, power windows, radio VIN: 1G6DM57794
this cadillac intermittanly has this problem. the power door locks, radio, power windows all quit working at the same time. when this happens the ignition key won't come out either. I did have a U1000 code in the radio but nothing else. hope this is a common i...
2007 Cadillac Escalade 6.2L parking assit VIN: 1GYFK63887
service park assit message comes on and check system out , found no codes,fuses good. Found tbs and tried what it says.Disconnect sensors like tsb said and it does not set codes. When looking at data is says led over current. Have not worked on this system so ...
1994 Chevrolet Corvette 5.7L No Start VIN: 1G1YY22P9R
At a loss at this point and our problem seems simple enough- No spark. Long story short is our ignition control module will not ground coil on and off to produce spark. The mystery to us is that all our tests indicate we should be getting spark. We have tested...
1997 Chevrolet Tahoe LS 5.7L Misfire VIN: 1GNEK13R3V
Here we go. we have this wonderful GM that has bank 2 miss fires at idle only, after vehicle warms up. When cold there are no miss fire counters registered, but once vehicle gets to operating temp bank 2 starts showing random miss fires, only bank 2(2,4,6,8)ba... Trouble codes: P0151 (O2 signal low bank 2 sensor 1), P0300 (Engine missfire detected)
2000 Chevrolet K3500 5.7L No Start VIN: 1GBJK34R1Y
Hello, I have this Chevy 3500 with 350. Has Spark, fuel press, and fuel vol. Injector pulse. Will run with carb cleaner. All injectors are at 12.3 ohm. Anyone have an idea on what this could be?
2003 Chevrolet Venture LS 3.4L Pass Key VIN: 1GNDU23E33
Came for an intermitent no crank. Ignition switch seemed to be wrong with excessive free play. Changed ignition switch with new key (used). Try to do a relearn key procedure. No result. Installed a used pass key III module. No relearn key possible. I found tha...
2003 Chevrolet Impala LS 3.8L Misfire VIN: 2G1WH52K53
back fires on acceleration Trouble codes: P0300
2005 GMC Sierra 2500 HD SLE 6.6L MIL Lamp on, Fuel Rattle VIN: 1GTHK23245
Calling all the diesel technicians Need Help Truck came in fuel smoking and a number four cyinder misfire code, tested injector and found it to be bad. Also had a MAF sensor code P0101 found bad connector pin. Replaced MAF and connector with OE parts. Replaced... Trouble codes: P0304 (Misfire number four cylinder), P0101 (MAF Sensor)
2007 GMC Yukon SLT 5.3L Misfire VIN: 1GKFC13J57
This Yukon has DTC P0300. The customer already replaced spark plugs. My Verus shows consistent misfire on #5 and #6 at idle. At 2000 RPM only #6 misfires. The vehicle is ALWAYS in open loop. Temp is reading on scan tool and gauge. I have swapped the coil, spar... Trouble codes: P0300 (Random cylinder misfire.)
2006 Hummer H2 6.0L 4wd VIN: 5GRGN22U36
having an issue with this truck. vehicle was diagnosed with a bad trans about 500 miles ago, so a reman unit was put in. 3 days ago customer complaint is it has no power backing up out of parking spots. now i believe this is a 4wd issue. seems to be binding in...
2005 Saturn Vue 3.5L Cluster VIN: 5GZCZ63435
Customer will be driving and all lights in cluster light and dinging times even loos of electric power steering. Due to random nature and u2106 u2105 loss of communication u0140. Tried looking for loose connections, dialetic greased connectors and pos...

Fixes & Summaries for GM
Fix/Summary Answers
2005 Buick Rainier CXL 4.2L Accessories VIN: 5GADS13S95
I found the problem it was fuse #46 under the left rear seat which was for the front AUX power and not the cigar lighter the wiring diagram suggest. To me it was a problem with the wiring diagram which is beyond misleading it is definitely not correct. Informa...
2007 Chevrolet Monte Carlo SS 5.3L MIL Lamp on VIN: 2G1WL16C87
Thanks to everybody that replied. We started off by replacing all of the afm lifters on the vehicle. Went on a test drive and P3400 still came up. Brought the vehicle back in and replaced the lifter manifold. FIXED!!! All of the solenoids tested good electrica... Trouble codes: P3400.
2003 GMC Envoy XL SLE 4.2L Hesitation, Cuts out, Stall, MIL Lamp on VIN: 1GKET16S63
I thought about this all weekend, and my thoughts were the same as most of you posted. I removed the throttle body and cleaned it up spotless. Can no longer duplicate the symptoms. Thanks everyone for all your help and replies. Trouble codes: P0172, P0495.
1992 Oldsmobile Toronado Trofeo 3.8L Instrument Cluster VIN: 1G3EV13L2N
Well it came down to the fact that the twilight sensor was not working I had been told that it was checked but when I checked and unplugged it the light started working. Customer has not appoved the $80 price on the new sensor so for now it is removed. Thank...
2001 Pontiac Grand Prix GT 3.8L theft deterent module VIN: 1G2WP52K81
Well after I did finally get it to relearn the light still was flashing.So I hooked the scanner up to find I have no codes in any module. So I let it run for about 15 minutes and shut it off and then I was going to try to relearn it one more time. I turned the...
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