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Prev Professional Automotive Repair Technical Discussions for January 4, 2010
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Open Help Requests for GM
Help Request Answers
1998 Cadillac Seville STS 4.6L Voltage Output VIN: WBASBV4FDA
Vehicle came in with the alternator not charging. So we put in a new one.Still same problem. Checked for power at bat terminal and that is good. As is the "L" terminal and "F" terminal at the back of alternator. No broken wires from "L" and "F" to PCM. If I di...
2003 Cadillac CTS 3.2L lubrication VIN: 1G6DM57N03
Ok guys I have a question. This cadilac with a 3.2 engine has an oil leak at the back top of the engine. I have the plenum off but still can't see back there very well. There is a pad that goes under the plenum and covers the back opening it has foam on the in...
2005 Cadillac CTS 3.6L Excessive Emissions, Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G6DP56765
No experience on this engine.Car was towed in 2 weeks ago and would not start, found almost no oil in engine, changed oil and vehicle started and has been running fine since. Now we have a rough idle, with misfire codes on bank 2 and intake correlation code P0... Trouble codes: P0018 (Crankshaft- Intake Camshaft Correlation Bank 2), P0012 (Intake Camshaft Position Performance Bank 2), P0300 (p0301-), P0301 (p0302-), P0302 (p0304-), P0304
1994 Chevrolet S10 4.3L Misfire, MIL Lamp on VIN: 1GNCS13W6R
thus far can not establish communication to pull codes. tested aldl have ground and 5 volts signal. will not evan allow jumper for light to falsh codes. have good powers and grounds at pcm. have 5 volt rev. signal at tps and ect. can not pull data stream and/o...
1997 Chevrolet Astro 4.3L No Start VIN: 1GCDM19W8V
no start condition when any kind of moisture out when finally started runs good all day but if there is any moisture will not start runs down battery starts fine on dry day's. towed in but restarted every time customer states only why its humid rainy or snowy ...
2003 Chevrolet Avalanche 1500 5.3L Stall, voltage drop VIN: 3GNEC13T83
when turning and braking simultaneously, the alt. volts drop and the engine stalls intermittenly.
2003 Chevrolet Malibu 3.1L wipers VIN: 1G1ND52J43
When the wipers are turned on, they work. However, when they are turned off, they will not stop(sometimes). Some times when the brake is applied the wipers will speed up and sometimes they will turn off when the brake is applied. They always turn off when the ...
2005 Chevrolet Malibu LS 3.5L Cuts out, Stall, ELECTRICAL POWER LOS VIN: 1G1ZT54805
I hope I can give enough information and hope someone has had the same issues.When clients issue happens it acts like you momentarily cycled the key, Speedometer drops, looses communication with scan tool. We have monitored the high and low GMLAN signals. This... Trouble codes: U2100 (history cab / buss communication), U0121 (no can bus communication), C0561 (abs system disabled), B3109 (keyless entry battery low)
2006 Chevrolet Express 3500 6.0L Misfire, MIL Lamp on VIN: 1GAHG39U46
freeze frame/ failure record rpm 556 tp% 10 app% 0 open /closed (closed) st trim 1%---5 lt trim-1%---18 st trim 2%---3 lt trim-2%---12 eng load%--17 map(hg)10.4 coolant F 187 map(v)1.13 map(gm/sec)5.75 veh speed 0 tcs active tcc command(off) tank pressure (v)1... Trouble codes: P0300
2006 Chevrolet Trailblazer LS 4.2L MIL Lamp on, P0171 VIN: 1GNDT13S86
Need some real help here. i have one know one can figure out. It is a 06 Trailblazer that keeps throwing a P0171 code. Whenever it feels like it. sometimes you can drive 20 miles and it sets and other times you can drive 400 miles before it sets. pulled it int... Trouble codes: P0171 (Fuel trim system lean)
2006 Chevrolet Cobalt LS 2.2L MIL Lamp on VIN: 1G1AK15F56
The vehicle has been back twice since the body repairs were finished, with check engine light on and power steering assist not working. The vehicle computer will intermittantly not communicate with the scanner, and when I do get communication, the codes mentio... Trouble codes: U0073 (Control module communication BUS off), U0100 (Lost communication with ECM/PCM), U0140 (Lost Communication with BCM), P0700 (Transmission control system fault)
1999 GMC Sonoma SLS 2.2L No Start VIN: 1GTC1940X8
well thanks inadvance well i have a gmc truck that came in for iterminted no start it starts fine for days and then it wont start she have to trune the key for a bit and then it starts then after that the truck runs fine all day she will park it and it will be...
2004 GMC Yukon SLE 5.3L abs VIN: 1GKEK13T74
after stop try to accel sounds like traction system was active, traction light comes on and accel pedal has no responds, after truck gets going light goes off and seems fine till next stop. feels like bad speed sensor sending signal to traction system that the...
2009 Pontiac G6 3.5L shifter VIN: 1G2ZH57N29
i am puzzled by this one. at times when the customer says he or she can not get the car out of gear after starting car. have tried several times but can not get it to act up. any help would be appreciated.

Fixes & Summaries for GM
Fix/Summary Answers
1992 Chevrolet S10 2.8L Poor Idle Quality, Hesitation, Cuts out, Stall VIN: 1GCCS14R2P
stupid aftermarket fuel pump made us run circles. nice call to the guys who said fuel. I just danced around it because it was new. Thank you!! to all 29 of you who responded. thanks 29 times.
1998 Chevrolet K1500 Cheyenne 5.7L Cuts out VIN: 1GTEK19R1W
Sorry to take so long to get back with a fix, I wanted to make sure we had a good fix. After testing and re-testing everything we could think of, the only thing we could find that could be the cause was the fuel pressure being slightly low. I connected my Moto... Trouble codes: P0171 (Fuel System Lean Bank 1), P0174 (Fuel System Lean Bank 2), P0161 (HO2S Heater Circuit Bank 2 Sensor 2).
2004 Chevrolet Silverado 1500 LS 5.3L Misfire VIN: 2GCEC19T74
After checking all the good suggestions, I do believe the view of several opinions that I am chasing a ghost. It seems that this skip/miss I feel is a symptom this Chevy was born with. It is a real symptom, with a phantom solution.
2007 Chevrolet Cobalt LT 2.2L air bag light VIN: 1G1AL15F37
thanks to all.sent to gm as the pass.seat module was replaced and never programmed
1989 Oldsmobile Cutlass Ciera 3.3L Cuts out VIN: 1G3AJ51N6K
i put a computer in this one. been driving it myself for a week. no problems. thanks to all for your help.
1988 Pontiac Fiero GT 2.8L No Start VIN: 1G2PH1193J
First of all thanks for all those who replied to this. I needed a new set of eyes to look at this problem. I called in George Menchu and Eric Figone to help me with this. They ran the same test I did and found my findings to be the same as theirs. Wiring diagr...
2001 Saturn SL1 1.9L Check engine light VIN: 1G8ZF52841
Well, thanks for all the replies, however in the mist of checking out by unplugging everything, we noticed the old computer in the trunk. The mechanic pluged it in and the code was gone. He then noticed the customer purchased the computer without checking th...
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