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Prev Professional Automotive Repair Technical Discussions for August 19, 2009
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Open Help Requests for GM
Help Request Answers
2002 Buick LeSabre Limited 3.8L TCC lockup VIN: 1G4HP54K12
We have this Buick that came to us with the check engine light on, with P0741 TCC stuck off/0742 TCC stuck on codes in system. No customer complaint on transmission function. Had code P0741 cleared at another shop and was told to monitor. Light came back for t...
2004 Buick Rendezvous CX 3.4L No Start VIN: 3G5DA03E34
we are useing a tech 2 and it will not comunicate with any module. I have power and ground to both pcm and bcm. I have both power and ground at alcl conecter. need help with why scan tool will not comunicate but will power up. thank you.
1998 Cadillac DeVille Concours 4.6L R and R VIN: 1G6KF549WV
the dreaded north star oil leak. oil pan. I did one of these years ago, but cannot recollect the procedure.There is a wiring harness in the way between the engine and trans bellhousing preventing removal of top bell bolts. Any trans r and r gurus out there tha...
2000 Cadillac Seville STS 4.6L tack and speedo VIN: 1G6KY5491Y
this car came in with no tack and speedo working at the time the speedo is not working the mill light does not come on when key is first turned on if car cools down the mil light will come on and the speedo will work we replaced the dash assy after checking mi...
1996 Chevrolet Blazer 4.3L No Start VIN: 1GNCS18W4T
Thanks in advance for any help. After it rains Vehicle will not start, has good spark, 62 psi of fuel pressure cranking, Spraying starting fluid does not help, the only time engine tries to hit is when you let off the ignition switch, no codes in the computer ...
2002 Chevrolet Tahoe LT 5.3L MIL Lamp on VIN: 1GNEK13202
hi guys i need some good answers on this tahoe. initially cust.came in with ses light on found code p0446 stored in comp. my diag. led me to this bull. for faulty evap vent sol. installed valve and revised bracket clear codes. the bull.# is 04-06-04-055a. afte... Trouble codes: P0446 (evap vent control problem)
2002 Chevrolet Impala 3.8L Cuts out, Misfire VIN: 2G1WH55K22
Hello everyone. I have another problem child. car came in for a tune-up and ignition key concern. I tuned up the thing with new wires , plugs, fuel filter and checked for codes. no codes found. also replaced the key cyl for sticky while starting. car runs grea...
2002 Chevrolet Impala 3.8L Lights flashing VIN: 2G1WH55K72
This happens even if the key is off. Relays clicking lights flashing, dash, park lights, head lamps even backup light. Has any one seen this? I looks like the BCM is possessed. Is there some thing I am Missing.
2005 Chevrolet Trailblazer LS 4.2L Fuel Gauge VIN: 1GNDT13S85
Hey guys, any input would be appreciated here. The Fuel Gauge just drops out when the customer fills up his tank and continues to be inaccurate until about a 50% tank and works ok. Upon testing the sending unit measures about 140 ohms, which is in spec for a h...
2005 Chevrolet Express 3500 6.0L abs VIN: 1GAHG39U95
ih guys i have this express 3500 van . this van will put the traction light on it wiil cut the throttle off steering no codes in the ebcm also the pcm look for a ebcm flash on the tis nothing . look at the wheel speed sensor look good . need some help thank yo...
2006 Chevrolet Equinox LT 3.4L Crash Sensor VIN: 2CNDL73F26
Hi I have this Equinox with an Air Bag light on the stored code is B0101 Electronic Frontial Sensor Failure. The information I find on this from identifix tells me to check the connection and if it looks ok replace the sensor. Does anyone know of any specific ...
2008 Chevrolet Silverado 1500 LS 4.8L Exhaust system vibration VIN: 1GCEK19028
Have anyone of you experienced this before and found a cure for it? The vebration occurs most when cruising without the engine pulling or coasting. Sometimes when accelerating from a stop. Thanks, Bob
2006 GMC Sierra 3500 SLT 6.6L MIL Lamp on VIN: 1GDJK39D96
Hi everybody, This truck gets serviced regularly at our shop. It's a 2006 GMC 1 ton with a 6.6L Duramax which came in with a history code P0087. The only time the code comes on is when they are hauling a loaded trailer and usually going uphill. When the code ... Trouble codes: P0087 (Fuel rail pressure to low)
1998 Oldsmobile Intrigue 3.8L blower motor VIN: 1G3WS52K8W
Hello gentlemen, i have an oldsmobile eating my lunch for a month now. the problem is that the blower motor intermittantly works properly. most the time it only works on high speed, and no operation on auto. i have replaced control module(twice), blower resist...
1997 Pontiac Grand Prix GT 3.8L a/c VIN: 1G2WP52K2V
car came in with compressor leaking. If system charged cooled excellent. We changed compressor, accum, and orifice tube. vacuum and charge with 1.88 lbs r-134. pressures take off upwards immediately on startup. Condensor has been cleaned and fans working at co...
2002 Pontiac Grand Prix SE 3.1L MIL Lamp on VIN: 1G2WK52J72
Vehicle was brought in for miss on acceleration, worse when warm, also MIL light intermittently on. P0336 DTC. Plugs, wires, both crank sensors were replaced. Miss on acceleration was repaired, however now the MIL lamp is on continous and the tach does not ope... Trouble codes: P0336 (Crankshaft sensor performance circuit A)

Fixes & Summaries for GM
Fix/Summary Answers
1994 Buick Park Avenue 3.8L Cruise Control VIN: 1G4CW52L2R
For all those who said brake switch due to the high resistance thanx. I found the tsb yesterday shortly after I posted on here. But I appreciate the responses! So I replaced the brake switch and cruise control opperates good. I tested the old brake switch and ...
1995 Buick Park Avenue 3.8L 1-2 shift VIN: 1G4CW52KXS
Thanks guys 15 replies all with the same answer I think we will sell them a rebuilt unit. Too bad with only 56,000 miles. again thanks for the quick replies. God Bless, Paul
1991 Chevrolet Lumina 3.1L No Start VIN: 1234567TNM
thanks guys for all the input,borrowed the scanner from work no rpm,changed crank sensor and runs like a top,i guess i should have checked ac voltage with it pluged in.
2004 Chevrolet Express 3500 6.0L Poor Idle Quality, MIL Lamp on VIN: 1GBHG31V64
im gonna call this one fixed as i havent heard any thing back from the customer to make me think otherwise. 4 new o2 sensors from the dealer sealed the deal instead of aftermarkets.if something changes , i will reopen this request thanks to all who replied. ... Trouble codes: P0171, P0174, P0134, P0154, P0300.
2004 Chevrolet Silverado 2500 HD 6.0L MIL Lamp on VIN: 1GCHC29U84
Does anyone remember the old adages "You learn the hard way in this life" and " You learn from your mistakes"? This vehicle covered both of those for us. The trick of loading a circuit with a light bulb is a good idea and it does work. But in the case of this ... Trouble codes: P1125 (Accelerator Pedal Position System), P2120 (Accelerator Pedal Position System Sensor 1 Circuit).
2008 Chevrolet Avalanche LS 5.3L entire vehicle VIN: 3GNFK12358
Thanks for all of the replies. When I got the vehicle back I test drove the vehicle and found that the vibration was way worse than before. Inspected previous work and found that the rear u-joint was missing the C-clips on the pinion yoke causing about of 1/4 ...
2003 GMC Yukon SLE 5.3L Rear AC temp door and mode door VIN: 1GKEK13Z53
I would like tho thank Michael and Long for their responses. they both mentioned the tsb pertaining to the new controller. I tried 2 new ones and still no difference. what fixed the concern was replacing the 2 brand new aftermarket actuators with new GM act...
2005 GMC Yukon XL 1500 SLT 5.3L hard start at times VIN: 3GKFK16Z45
sorry it took sow long to replay but the car just came back i replaced the fuel pump the fuel regulator is built in to it thanks for all the help all data is wrong it is not on the fuel rail sow check before you quote the job i believe it starts in 2005
1995 Oldsmobile 88 Royale 3.8L Hesitation, Cuts out VIN: 1G3HN52K2S
Hey guys, Thanks for all of your help. The owner did not want to spend anymore money. He said he was headed to a cash for clunker dealer. I was never able to pinpoint any issues although I tried all suggestions givin...Thank you all so much for your time!
1998 Other GM p30 chassis 350CID Engine VIN: 1GBHP32R8W
Thanks for the help everyone. Especially to Kent from florida for taking the time to share his knowledge. We followed your advice and pulled it out the front and all is going well.
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