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Prev Professional Automotive Repair Technical Discussions for February 2, 2011
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Open Help Requests for GM
Help Request Answers
1998 Cadillac Seville STS 4.6L Instrument panel VIN: 1G6KY5498W
Vehicle came in with no crank. Tested battery and found battery defective. Replaced battery and released the vehicle. Came-back two days later with the same symptom. Tested battery and found battery drained. Rechaged battery and found no crank condition in the...
2001 Chevrolet Suburban 1500 LT 5.3L 4x4 operation VIN: 3GNFK16TX1
01 suburban with a 246 transfer case.Will not shift out of 4 high.Took off encoder motor and put wrench on shaft coming out of case.Will not go into 2wd.Replace transfer case with used one.Tested on lift every thing good,In and out of 4x4 opp.Came back month l...
2002 Chevrolet Monte Carlo SS 3.8L Door Locks, Trunk Locks, Alarm, Instrument Cluster VIN: 2G1WX15KX2
Security light comes on while driving down the road. No codes in bcm for security. Lights dim a little bit when the security light comes on. Also, after the driving cycle with the security light coming on, when going back to vehicle, the locks and trunk releas...
2002 Chevrolet Trailblazer LS 4.2L Accessories VIN: 1GNES16226
Hey guys need a hand here. This chevy has an intermitten two amp draw that is accompanied with an inoperative insrument cluster at same time ( illumination also ). When cluster is working the parasitic draw is fine at .010 milliamps. I believe they are related...
2003 Chevrolet Cavalier 2.2L steering gear VIN: 124J568F03
good afternoon all would like some suggestions on personal car of the wife.have checked ball joints tie rods struts replaced couple years ago with quick strut assemblies.while turning to left and only to the left there is a shudder.don't really want to go as f...
2003 Chevrolet C4500 Kodiak C4C042 6.6L Stall VIN: 1GBE4E1143
Trying to help a friend who purchased this vehicle. New injectors and New ECM installed along with Old HP pump w/ new FPR. Also has a low pressure fuel pump installed to feed fuel to HP Pump. Truck starts and runs fine. Will run for a few minutes then just shu...
2004 Chevrolet Cavalier 2.2L transmission VIN: 1G1JC52F64
Thanks for any help in advance.I've got a 2004 Chevy cavalier that can in with a leaking slave cylinder. replaced the slave cylinder and clutch and resurfaced the flywheel put it all back together and as i was bleeding the system i saw the slave cylinder was l...
2005 Chevrolet Express 1500 4.3L ABS module VIN: 1GCFG15X15
Lights ABS no codes checked all three sensors are working properly! ABS pump works too GM TECH 2 watched it through but the lamp does not light off the land plus all comes on the module, everything is there!
2006 Chevrolet Cobalt LS 2.2L Electrnonic Steering VIN: 1GIAK55F96
Hello guys, i am here again, this time i have a chevy cobalt, with electric assist steering, some times the vehicle loses the steering assist, and dtc co475 power motor circuit open sets in bcm. We fallowed the flow chart for this code,and it instructed to rep...
2000 GMC Yukon SLE 5.3L Unknown VIN: 1GKEK13T2Y
Blend door motor, I cant seem to find straight forward answers on 'Mitchell' as to the correct location. Mitchell shows lower center, but yet it seems to be upper center below top of dash. Hve chased many repeair instructions. We have the dash panel removed an...
2006 GMC Sierra 2500 HD SLE 6.6L MIL Lamp on VIN: 1GTHK23D86
Hello All and thanks in advance, This vehicle is one of my regular customer's. Sevice lamp came on and I scanned the very next day. All glow plugs have failed. My concern is future failure of new glow plugs. I am wondering what steps I can take prior to rep... Trouble codes: P0671, P0672, P0673, P0674, P0675, P0676
1995 Oldsmobile 88 Royale LSS 3.8L No Start, MIL Lamp on VIN: 1G3HY521XS
This vehicle was diagnosed as a no-start. I went to the customer's house to connect to the scanner and found out there was a no-communication problem with the scanner & vehicle. After I left customer stated vehicle started and ran o.k. She brought vehicle to m...
1996 Pontiac Grand Am SE 2.4L No Start, Backfires VIN: 1G2NE52T2T
Hello, getting pretty aggravated with this Quad 4. Vehicle does not start, backfires through intake and exhaust when cranking, I obviously have fuel and spark. Saw the crank sensor code and changed it. Customer had already changed the batt and starter. I repla... Trouble codes: P0335 (Crank sensor circuit a), P0341 (Cam sensor)
1997 Pontiac Firebird Trans Am 5.7L No Start, Stall VIN: 2G2FV32P5V
This LT1 Trans Am shuts off and won't restart right away intermittently. Runs good otherwise, doesn't sputter or miss, shuts off like turning off the key. When it restarts it fires right off and runs good. The one chance I had to test it not running it had no ... Trouble codes: P0161

Fixes & Summaries for GM
Fix/Summary Answers
1993 Cadillac Eldorado 4.9L Dash/air ride VIN: 1G6EL12B4P
HVAC power module repaired vehicle.Module has constant power.Fan would operate on high with HVAC control head out of vehicle.surmize module internally switched to power up blower fan.HVAC control head has a speed input wire spliced into fan power wire.Feed bac...
1995 Chevrolet G20 Chevy Van 5.7L Speed Buffer VIN: 1GBEG25K8S
In short, the fix was to rewire/replace the speed sensor wiring. --- My oversight was that I had signal from the VSS to the module, but the amplitude was no where near what it should have been. After the repair, with the Modis scope on a 20v scale, the wav...
1997 Chevrolet Lumina 3.1L Excessive Emissions, Hesitation, Surge VIN: 2G1WL52M4V
Well guys, I went back over the things I had already checked such as the fuel pressure and volume, the cam and crank sensors, the MAF sensor (which by the way I missed putting a decimal point after the 16 when I was reading the scan data), the MAP sensor ect..... Trouble codes: P0719 (Brk Sw. B circuit signal low/shorted).
1998 Chevrolet K2500 Silverado 6.5L Mechanical
Sorry it took so long for me to get back to everyone. I wound up pulling the transmission and tearing it down and finding several direct clutch and steel plates stuck together. Threw in a rebuild kit and all was well after that. Thanks for all the replies.
2003 Chevrolet Silverado 1500 LS 5.3L MIL Lamp on VIN: 2GCEK19T13
Thanks to All who answered Definitely intake gaskets! The truck would missfire when cold & then straighten up warm. The odd thing is there was a maf code but never saw a maf problem. Intake gaskets fixed it & I can't say enough good about all the messages & so... Trouble codes: P0171, P0174.
2004 GMC Sierra 2500 HD 6.6L Tow mode VIN: 1GTHK23134
Hello Techs, I hope you are all staying warm in this weather! First I would like to say sorry for not going into much detail on this post, a few replies wanted more details. We fixed the truck, the problem was the shift lever clip and wire were broken. We w...
2010 GMC terrain 2.4L Daytime running lights VIN: 2CTF1JEWOA
Thanks for the responses. I realize that the DRL's do come on standard, but am doing a Manitoba safety. The DRL's can be shut off if the headlamp switch is rotated to the off position after a start, and will remain off until the ignition key is cycled again. M...
1997 Saturn SL2 1.9L Stall VIN: 1G82K5275V
thanks for all the replies, as everyone suggested, check crank sensor and i did. it looked really rough, replaced it and the vehicle has been running since. thanks again for all the help.
2001 Saturn LW300 3.0L No Start, Poor Idle Quality, Stall, Misfire VIN: 1G8JW82R71
removed timing cover and found tensioner assembly had failed the bearings let go in the tensioner replaced with new belt ok now Trouble codes: P0171 (Lean), P0174 (Lean), P0300 (Misfire detected), P0301 (1 misfire), P0303 (3 misfire), P0305.
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