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Prev Professional Automotive Repair Technical Discussions for August 10, 2012
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Open Help Requests for GM
Help Request Answers
2005 Cadillac CTS V 5.7L Mechanical VIN: 1G6DN56S05
Fellow techs, we have a cadillac cts-v 5.7l w/ t56 manual trans. That has a hard time getting into reverse and clutch pedal has a delayed release when shifting at high rpms (5000+) gm has a service bulletin on the pressure plate/date code in these cars, my que...
1995 Chevrolet K2500 Suburban 6.5L No Start VIN: 1GNGK26F8S
Got a tough one here (for me!). Towed in cranking no start. We had installed new injection pump and PMD (update kit) two years ago. Confirmed lift supply and good volume and pressure indicated up to injection pump. Installed clear line at inj. pump and no air ...
1996 Chevrolet Blazer 4.3L MIL Lamp on
Have a 96 blazer 4.3 liter. Need some insight from the GM techs out there. Keeps setting p0143 for post cat o2 low voltage. The truck has the correct catalytic converter and the correct rear o2 sensor. Sometimes it takes 2 days for the code to return, but it a...
1996 Chevrolet Blazer 4.3L Misfire VIN: 1GNDT13W8T
Vehicle came in for a check engine light PO301, tech thought he had a bad plug and an ignition tune-up was done, car came back 2 day later with light back on same code. Found mis-fires at idle on modis. Tech thought intake was leaking, so intake gasket was rep... Trouble codes: P0301
1999 Chevrolet C3500 5.7L Hesitation, Cuts out VIN: 1GBJC34R5X
hi there and thanx in advance we got this truck in with a complaint of truck cutting out and check engine light onand cutting out running rough. Now I found that the harness behind alternator came out of clip and melted on manifold, repaired wiring and found t... Trouble codes: P0151, P0335
2002 Chevrolet Silverado 2500 HD 8.1L Transfer cas VIN: 1GCHK29G02
This problem vehicle first arrived with tansfer case stuck in 4lo and would not shift out.Found transfer case fluid low,encoder motor siezed and 12 volts reference voltage from control module(Alldata specs are 8 volts)No codes.Replace encoder motor and control...
2002 Chevrolet Avalanche 1500 5.3L Unknown VIN: 3GNEK13T42
This truck came in with a noise we thought was a belt squeak. We removed both belts and the noise is the same. At idle it sounds just like a belt noise and off idle it is more of a rattle. We have run it and killed the cylinders one at a time and this did chan...
2003 Chevrolet Tahoe LT 5.3L Steering Pump/Box VIN: 1GNEK13Z33
I have this 2003 Chevy Tahoe It has 140,000 Miles on it. I just purchased it and the steering is very very easy to steer. It feels like absolutely no resistance. It sort of seems ok in parking lots but 60 mph on highway it is scary. I have checked front end an...
2003 Chevrolet Silverado 1500 5.3L Misfire, lacks power VIN: 2GCEK19T73
Hello to all and thanks for any help in advanced. This truck was towed into us for what the customer thought was a transmission issue.customer stated he was driving down the interstate running around 70mph when the truck started to loose power and got to a poi... Trouble codes: P0118, P0172, P0175, P0300, P0446
2004 Chevrolet Colorado LS 2.8L MIL Lamp on VIN: 1GCCS19844
Codes p2101 P1562 both related to ETB I checked 5volt reference and have both KOEO. My wiring only shows the 8 wire connector at the ETB for a diagram it doesn't show any other real info is there more to testing the ETB? Modis shows TP 1% at KO. and 30-33%TP... Trouble codes: P2101 (Control Module Performance), P1516 (Tac Module Performance)
1997 GMC Yukon SL 5.7L Mechanical VIN: 3GKEK18R3V
Group, Attempting to upgrade from a 10" drum to an 11" drum on a 1997 GMC Yukon 2 Door, 4wd. My truck, and I also own a 1999 of the same truck in a 4 door with 11" brakes. From what i can see, of course the backing plates, shoes, hardware, adjusters and cylin...
2007 GMC Yukon XL 1500 Denali 6.2L Liftgate Module VIN: 1GKFK66807
Decided it needed a liftgate module and know it needs to be reprogramed. We got the appropriate GM Tech 2 program but can't figure out how to get it onto the hand held Tech 2 system we have. Plugged it into the computer and nothing. Searched the entire website...
2001 Pontiac Grand Prix GT 3.8L no inj pulse VIN: 1G2WP52K71
2001 Grand Prix. No codes.No start. No Inj pulses, weak spark.I Only have 11 volts at Injection fuse (#18 10amp under hood fuse box) If I Jump full battery voltage to fuse, car starts and runs fine. Without jumper wire no start. My alldata does not show what f...
2008 Pontiac G6 GT 3.5L No Start VIN: 1G2ZH17N78
Hi all, vehicle towed in with no start. All I have is error message on odometer. No communications with any modules in vehicle. I checked all fuses and visible connections at modules and tested data link pinouts , all fine. Not sure where to go with this one b...
1999 Saturn SL2 1.9L Poor Idle Quality, Misfire VIN: 1G8ZK5273X
this comes to me from another shop with po336 crank sensor performance code and terrible idle, wont run over 2k rpm and just cuts out and sputters, initial check found connector at ckp butt spliced several times, started out replacing with new delco pigtail an... Trouble codes: P0336 (cam position sensor performance)

Fixes & Summaries for GM
Fix/Summary Answers
1999 Chevrolet Silverado 2500 6.0L ABS Module VIN: 1GCGK29U1X
Thanks to all who replied to this message. After reviewing them I went back and instead of just tightening ground connections at the right rear of the engine, left lower frame rail and left lower side of the block. I cleaned the connections to their shinniest ...
1999 Chevrolet K1500 Suburban 5.7L p0154 VIN: 3GNFK16R7X
2003 Chevrolet Impala LS 3.8L Engine temp VIN: 2G1WH55K63
Thank you all for your help! After scoping the temp sensor last night and watching climb and stay steady. I believe this car has a instrument cluster problem, or a communnication issue with the pcm. The customer has decline going further knowing the car is...
2003 Chevrolet Silverado 2500 HD 6.6L Cooling Systems VIN: 1GCHK29103
thanks to all. yes water pump weep hole it is,, location through me off have a great day
2003 Pontiac Bonneville SE 3.8L oil pressure guage VIN: 1G2HX54K33
Back in the shop and finally got a toolbox to work out of. I'll address the faulty oil pressure reading first. Slight seepage from the OPS when I unplugged connector. No visible harness damage. Leaking OPS = replacement in my book so in went a new sender. Prob...
2004 Pontiac Grand Prix GTP 3.8L 1st gear VIN: 2G2WR52434
Thanks to all who responded. Justin from Michigan, thanks for the detailed response. I verified that, like everyone suggested, we are dealing with a internal transmission failure. Now, for those who have not had to deal with these cars, let me share some of th...
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