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Prev Professional Automotive Repair Technical Discussions for May 2, 2012
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Open Help Requests for GM
Help Request Answers
1997 Buick Park Avenue 3.8L engin run bad VIN: 1G4CW52K7V
Came in with miss fire and mil flashing. Wires and plugs old and replaced. No help and can smell cat.Dropped cat no help. Checked compression on #5 170 psi.Indexed #1 and checked timing with light and looks good.Checked wiring of plugs and good,done one at a t...
2005 Buick LaCrosse CXL 3.8L evap. system VIN: 2G4WD53225
this buick has dtc po442, small evap leak. smoked system, no leaks found. for some reason i cant get my scanner to command the solonoids to open and close. just wondering if anyone seen common problems with these lacrosses. someone already replaced the fuel ca...
1998 Chevrolet Blazer 4.3L No Start VIN: 1GNCS13W5W
Hello everyone, Have a vehicle in the shop which loses fuel pressure quickly after start-up (when only turning on ignition switch without running engine). Shutting off the switch we lose the fuel pressure instantly to zero psig. We initially recommended to re...
2003 Chevrolet Malibu LS 3.1L No Start VIN: 1G1NE52J83
anti theft light was flashing, pass lock data was invalid, after clearing code u1000, engine started and ran. no codes in bcm, abs, or srs, u1000 shows up on engine and trans only. can't find iny info on this code. mitchel shows a code u2000, are they one and ... Trouble codes: U1000
2006 Chevrolet Malibu LT 2.2L Brake Lights VIN: 1G1ZT51F16
Hey All, I had this vehicle in today and can not get my Tech2 to calibrate the brake sensor. It gets hung on the "in progress' screen and will not continue. (how long does it usually take?) In the data stream you can see it is unlearned, it sets a calibratio...
1999 GMC K1500 Suburban SLE 5.7L Driveshaft VIN: 3GKFK16R6X
We have a 99 4X4 GMC Suburban that is making noises. The history is as follows: 1.) The noise is a rattle / ratchet coming from the xfer case and/or the differential. 2.) The front driveshaft was replaced (by another shop) and the noises started. 3.) The fron...
2002 Pontiac Grand Am GT 3.4L pressure control solenoid VIN: 3456789E92
hello and thanks in advance. This car came in with shutter on. the shifts, fluid burnt lots of material in pan. We removed the trans and replaced it with a totally different unit. it still shutters on the shifts.All pressures are good in all ranges sitting sti...

Fixes & Summaries for GM
Fix/Summary Answers
2001 Cadillac DeVille 4.6L power windows and locks VIN: 1G6KD54Y81
Got it!! It turned out to be one of the small gauge orange battery feed wires at the "B" post plug. It was broken inside the wire casing and when tugged on did not give any. When checking voltage I was doing so with the B post plug pulled out of the jam area a...
2007 Cadillac Escalade ESV 6.2L Ride Control VIN: 1GYFK66867
Thanks to all who helped me/our shop with your responses. Turns out the customer ended up trading in his Cadi for a Dodge Diesel. Sorry I couldn't help with any other solutions or answers to his problem Cadi.
1994 Chevrolet P30 7.4L Fluid VIN: 1GBKP37N8R
practically all u members were correct n it was full of air i just could locate that little bleeder as it was @ right side towards rear n bleeder was so small.guess i was lookin for a #10 r 3/8 size but it was covered w/stuff a piece of tape i`m thinkin somone...
2000 Chevrolet Malibu 3.1L MIL Lamp on VIN: 1G1ND52J1Y
Thanks to everyone who took the time to respond. Several of you were correct, it was the fuel pressure sensor keeping me from running my tests. It just so happens that the pressure sensor solved the DTC problems as well. I was able to run the evap monitor t... Trouble codes: P0443 (Evap Purge Ctrl Valve CKT malfunction), P0446 (Evap Vent Control malfunction).
2002 Chevrolet Impala LS 3.8L Oil pres.guage VIN: 2G1WH55K92
Looks like we had 2 problems 1 the sending unit was hemoraging oil and the ground at the trans was bad,ther is only one sensding unit and thats for the guage If the guage indicate low oil pressure the DIC lights the low oil pressure waening light, Thanks to Al...
2003 Chevrolet Avalanche 1500 5.3L Reverse gear VIN: 3GNEC13T13
Hi again guys, it took me a while to figure this out on my own 4L60E (2003) tranny, all that replied were right. somehow the lo & reverse clutch support assembly retainer pop out and went in between the case and the sun shell and lock the shell and completely ...
2004 Chevrolet Monte Carlo LS 3.4L radio VIN: 2G1WW12E14
Well, customer opted to not fix and we got busy with other things. Indeed the tech 2 does need update to flash bcm. Thank you to all who replied.
2007 Chevrolet Suburban 1500 LTZ 5.3L Lifter VIN: 1GNFK16337
Thank you all for your advice. I put both options to the customer and he opted not to marry me. We are going to get an updated engine from GM and install it for him. You all are the best!
2004 GMC C7500 Topkick C7C042 7.2L Abs VIN: 1GDJ7C1C14
Well, I had to give the truck back to the customer because he still has to use it. He is supposed to bring it back but since I do not know when, I will close this and update if/when I find something useful. I had already checked the ground on the frame under t...
2007 Hummer H3 3.7L Draw VIN: 5GTDN13E17
Thank you to all that replied. We didthe battery test over night and both batterys held firm at 12.7v. So we put her battery back in and with the help of a TSB that stated the Onstar modules can make random unwarranted calls at times we pulled the fuse for Ons...
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