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Prev Professional Automotive Repair Technical Discussions for July 19, 2013
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Open Help Requests for GM
Help Request Answers
1997 Buick Regal LS 3.8L Cuts out, Stall VIN: 2G4WB52K5V
New customer with a head scratch-er of a Buick. Vehicle stalls after 10 to 20 minutes of driving, intermittently. It tends to do it more when engine has had time to cool off. It can run at idle for hours with no problem. Fuel pressure regulator has been checke...
2001 Cadillac Eldorado ETC 4.6L Alternator VIN: 1G6ET12941
Hi Everyone, What is going on with this car is that the charging system seem to be working fine when the car is cold or when you first start it in the morning. As things come up to normal operating temp volts start dropping Starts at 14.2 volts then 14 then 13...
2002 Chevrolet Silverado 2500 HD 6.6L MIL Lamp on VIN: 1GCHC23142
Good day, this Duramax has got me a little perplexed. At idle this fuel system is pulling 10" vacuum, at WOT its at 14". So started at changing fuel filter, no change, changed collapsed fuel lines at filter, no change, dropped fuel tank and inspect sender, no ... Trouble codes: P1093, P0101
2002 GMC Yukon XL 1500 Denali 6.0L Low beam headlights VIN: 1GKFK66U02
I am sure this is something I am over looking. Knowing the history of bad switches on these things I went there first. Got to the switch and found to overheated/corroded wires. Great cut and dry right, wrong. Customer ordered new switch (to expensive through m...
2005 GMC Sierra 3500 SLT 6.6L Excessive Emissions VIN: 1GTJK33265
Ok we did the head gaskets and all 8 injecters trucks run great it just smoke under load or when pulling it leave a big clould on take off and leaves a light stream untill you let out of the gas or back off to 1/4 throttle i flow tested all my injecter and did... Trouble codes: P1621 (Control module long term memory performance)
2008 GMC Acadia SLE 3.6L radio VIN: 1GKER13768
car was towed to me with transmission problem, customer asked if we could look at radio at the same time. I said sure how hard can that be well I still haven't fixed radio, it has no codes plays all channels but only plays though the front twitters, not sure w...
2011 GMC Acadia SLE 3.6L Temp. VIN: 1GKKVPED9B
Idle when become to hot ecm cut a/c and hi side pressure 2660 kpa (385 psi). Go on road all is ok. Trouble idle. Scan all system no code.
2006 Pontiac G6 GT 3.5L No Start VIN: 1G2ZH55856
Here we go GM techs... Vehicle came in with the engine knocking and banging like real bad and oil all over the bottom end. Long story short, owner overfilled engine with approx 1 to 1.5 gallons of oil. Customer wanted a used engine, so we got one with about 4... Trouble codes: U2105 (Lost communication with engine control system), U2109 (Lost communication with powertrain control system)

Fixes & Summaries for GM
Fix/Summary Answers
1994 Chevrolet C1500 Suburban Silverado 5.7L No Start, Cuts out, Stall VIN: 1GNEC16K3R
alot of good suggestions guys, a couple of you posted about checking oil pressure and the oil pressure switch as it can cut out for low oil pressure, become faulty, etc. I have not been able to duplicate the concern but I'm going to go ahead and replace that o...
1995 Chevrolet S10 2.2L Charging VIN: 1GCCS19495
Thanks for all the help from all who replied. The problem ended up being #1 injector had internal short and ignition mod problem. the alt did not have to much a/c leakage. I took the alt out of the loop and used a battery charger to induced high voltage (14.5)...
1997 Chevrolet K1500 Cheyenne 5.0L High Idle VIN: 1GCEK19M2V
First off I want to thank all of the techs that have responded to this request. The customer has acquired a new truck but still owns this one. He is leaving town till late October. He will have me fix the vehicle so that he can sell it in November when he is b...
2001 Chevrolet Blazer LS 4.3L readiness moniters VIN: 1GNCS13W41
Thanks for all for the responses, and special thanks to both Bill and Saheed who hit it right on the head. We had not noticed that our fuel gauge was erratic or even inoperative at times. We replaced sending unit and within 10 miles of driving all but 1 monite...
2003 Chevrolet Silverado 1500 5.3L horn VIN: 1GCEC19T23
Final fix was replaceing canceling cam and cleaning the contacts along with the new horn switch. Horn switch did run through the sir coil (clock spring) but not a part of the sir system.
2008 Chevrolet Avalanche LTZ 5.3L Instrument Cluster VIN: 3GNFK12348
I want to first thank Dustin [...].All of you gave me information on how this system worked and gave me things to check.I started at the DLC resistor which on this Avalanche is located about 8 inches from the EVAP vent valve abo...
2007 GMC Sierra 2500 HD SLT 6.6L No Start, MIL Lamp on VIN: 1GTHK23607
Thanks to all that responded. After starting fresh again i ran the truck until it started coding and shut it off, unplugged the unresponsive EBCM and cleared the system again. No more problem. Replaced the EBCM and reflashed all the modules. The GMLAN low spe... Trouble codes: U0106, U0101, U0140.
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