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Prev Professional Automotive Repair Technical Discussions for January 22, 2013
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Open Help Requests for GM
Help Request Answers
2002 Buick Regal LS 3.8L Ipc VIN: 2G4WB55K72
Ok i know i have read a post in the last few weeks that was acting just like this buick so this is whats going on starts up fine but quits running when you turn on the left or right turn signals.i mean it shuts off like you turned the key.if you turn on either...
2004 Cadillac SRX 4.6L Misfire, MIL Lamp on VIN: 1GYEE63A94
please help car has been back a few times we replaced the engine sometime in nov 29, car keeps coming back to our shop with different codes everytime we replaced engine, throttle body assy., coils, injectors,plugs Trouble codes: P0138, P2135, P0300, P1101, P0101, P0420
1998 Chevrolet Tahoe 5.7L transfer case control module VIN: 3GNEK18R6W
Is this clicking noise normal when you turn the key on or off. transfer case works properly in all modes. is there a problem I'm not seeing or is this normal?
2000 Chevrolet Venture 3.4L No Start VIN: 1GNDU03EXY
i'm reposting this auto,because you can only update one time. this is now a no start unless mass air flow sensor us unplugged. with it unplugged it starts right up but with high idle. with sensor plugged in it coughs and back fires through intake. has new modu...
2001 Chevrolet Silverado 2500 HD 6.6L No Start VIN: 1GCHK29101
Caught in the middle on this one, please let me know if it sounds like I'm whining! The history that I know of with this truck is the customer drove it with bad injectors until the engine was toast. Young kid who just finished the diesel course at the local co...
2005 Chevrolet Silverado 3500 6.6L coolant VIN: 1GCJK33205
This is my personal vehicle and actually have another one in shop right now doing head gaskets. The one doing the head gaskets failed block check and was pushing pressure past the radiator cap after about a week of driving. My truck does NOT fail block check a...
2006 Chevrolet Suburban 1500 Z71 5.3L cooling fans VIN: 1GNFK16Z96
Got a faily new suburban with a lot of miles on it in here today with an overheating condition. I found that the fans are never commanded on once the engine reaches a high temp [it will get to 223 degrees before I shut it off]. I can command each of the 3 rela...
2007 Chevrolet Avalanche LTZ 5.3L variable lifters VIN: 3GNFK12327
after repairs vehicle started right up sounds good , go for test drive low power and check engine light comes on codes p3401 p3425 p3441 p3449 lifters inactive. i am certain the lifters are in the right direction- oil holes facing center of engine . acts like ...
2007 Chevrolet Silverado 1500 LTZ 5.3L ebcm VIN: 1GCEK19J07
hey everyone thanks in advance for this one.. I cannot get communication with this ebcm tryed tech 2 , modis still nothing.. can can comunicate with the fuel pump control module and all the other modules on high speed bus network. both the red and amber color ...
2009 Chevrolet HHR LT 2.2L engine VIN: 3GNCA23B69
Have low comp. in #1 and slightly high in #4. Looked in the repair archives and saw some timing chain issues with this engine. My questions are; Does this sound logical, and is this a "common" failure? This is the first one I've seen. Just looking for some fee...
2009 Chevrolet Express 2500 4.8L Oxygen Sensors VIN: 1GCGG25C49
This van just got a new throttle body because of a TPS code. The lean upstream O2 codes have been there before that repair and were cleared and keep coming back. Are these common for intake manifold leaks? I cannot find a test port for fuel pressure but there ...
2011 GMC Sierra 3500 HD WT 6.0L Air Bag, Instrument Cluster? VIN: 1GD312CG1B
The instrument cluster has been showing a service air bag warning message but the air bag module has not recorded any codes. I was going to look deeper into the issue and check CAN lines etc. but now the truck has started displaying erratic rpms and mph readin...
1995 Pontiac Grand Am SE 3.1L No Start VIN: 1G2NE55M8S
Please read this whole post as I am all over the place with it, the car has been here over a week and I want to get all the information out here. This car came in customer stated that it would die hot. Upon arrival it did start and ran with a couple dead holes...

Fixes & Summaries for GM
Fix/Summary Answers
1989 Chevrolet K3500 Silverado 7.4L Excessive Emissions, Poor Idle Quality, Cuts out VIN: 1GCK34N6KE
Sorry for the delay in closing this, I have not fixed this vehicle. I tried all the suggestions, but couldn't find out what was wrong with this thing. It still idles poorly, but off idle it is very powerful. The first place had replaced a bunch of parts, inclu... Trouble codes: 44 (lean exhaust).
2000 Chevrolet Venture 3.4L Stall VIN: 1GNDU03EXY
after ign. switch, can sensor. it now won't start unless mass air flow sensor unplugged. Trouble codes: U1040.
2000 Chevrolet Silverado 1500 5.3L 4wd VIN: 1GCEK19T1Y
Well after doing some more cks I started wiggling harnesses and finally got to talk to the module and it said there was an issue with the encoder ckt. I went back to that area and found some pin issues on the connector for the encoder. Scott was on the right t...
2002 Chevrolet Impala 3.4L No Start VIN: 2G1WF52E22
turns out cam and 24x crank sensor fixed this one.frustrating thing was had excellent waveform signals when backprobing at pcm, even though neither one was working at all.with sensors unplugged and checking at pcm connector waveform signal present.fooled us go...
2003 Chevrolet Silverado 3500 6.6L Starting VIN: 1GBJK34183
Well this one was crazy in itself. First thing I did was change the fuel filter yet again from a Wix to the Delco. Five straight days no issue. Left it over the weekend and it fired right up. But as a precaution I disliked the feeling of the ignition so I c...
2005 Chevrolet Colorado Z85 LS 3.5L Hesitation, Surge, Cuts out, Stall, MIL Lamp on VIN: 1GCCS13685
Well , let me start thanking all you guys that replied to my request , you are awesome !! and finally , my colorado is fixed and running like a top again ! Most of you advised to do the rewiring ( which I knew that I was going to do sooner or later ) , so I d... Trouble codes: P060E, P2135.
2006 Chevrolet Impala LT 3.5L converter VIN: 2G1WT58K56
After performing several diagnostics, we recommented to the customer that the transmission be removed to facilitate repair. Customer has not returned with vehicle as of today - I don't believe they can afford the repair.
2007 Chevrolet Suburban 1500 LT 5.3L Rear liftgate
Thanks to David from New York for sending me a tsb on some sir codes causing liftgate to become inoperative. New sir module was installed along with both front seat belt tensioners (vehicle had been wrecked) and liftgate now works. As always thanks to all wh...
2008 Chevrolet Trailblazer LT 4.2L Stall VIN: 1GNDT13S28
Thanks for all the replies, after extensive checking of the wiring and various modules, we replaced the bcm, sent it to dealer for flashing, now everything is working properly. Thanks again. Trouble codes: U1301 (Class 2 communication circuit low voltage), P1630 (Theft learn mode or system volt EPR).
1998 GMC K2500 Sierra SL 7.4L Poor Idle Quality, Misfire VIN: 1GTGK29J3W
Hello all thanks for all the info, want to apologize for the update of 150 psi on running compression, must have looked at it wrong or something, engine off compression on bank 2 was cycl. 2 135, 4-140, 6-135, 8-140, running compression cycl 2 was down to 35 p...
2005 Hummer H2 6.0L Ignition Lock Cylinder VIN: 5GRGN22U65
Andrew nailed it: the floor shift mechanism was binding causing incomplete retraction of the collumn solenoid intermittantly. Cleaned & lubricated and all is well. Many thanks to all who replied!
2003 Pontiac Grand Am SE 3.4L Injectors not opening VIN: 1G2NF52E33
Let me start out by saying thank you and sorry for the delay in responce! I have fixed the problem thanks to you all. The customer had neglected the water paump and it was leaking into the a/c compressor which ended up blowing the fuse (#37, something we had o...
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