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Prev Professional Automotive Repair Technical Discussions for July 26, 2011
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Open Help Requests for GM
Help Request Answers
2002 Cadillac DeVille DTS 4.6L prndl VIN: 1G6KD54YX2
After we installed the parts in the car the prndl shows park in every gear range and will not allow movement. Also the car will start in any position the shifter is moved into.Did not bother with the internal mode switch at all and checked all harness connecti...
2008 Cadillac SRX 3.6L Cooling Systems VIN: 1GYEE63718
vehicle came in with a oil consuption issue. We installed new rings and valve guide seals we do allot of these and have never had a issue in the past. The vehicle will drive 15 miles and jump from half way straight to hot. We have done the following checked fo...
2001 Chevrolet Silverado 2500 HD 6.0L brake pedal VIN: 1GCHC29U51
Hello group, Got a tough one here (for me). This silverado came in with no pedal;master cylinder full;examined lines,calipers,pads,all ok. I pulled brake lines from master cylinder and screwed in test plugs,pedal high and hard.I clamped brake hoses with o impr...
2005 Chevrolet Silverado 2500 HD 6.0L master cyl VIN: 1GCHC24U75
Everything has been replaced at least once with no iprovement. When turning a tight turn or up against the lock the brake pedal will go to the floor and lose of power steering. Straight ahead hard stop is fine. Posting for a friend.
2002 GMC Sierra 2500 HD 6.6L fuel in oil VIN: 1GTHK29132
truck was towed in for losing oil on the highway & oil pressure, found oil over filled due to fuel, no codes, & runs great {after i changed oil of course just to move it around the building} was wondering if there is any way to pinpoint fuel leak{s} under valv...
2004 GMC Sierra 2500 HD 6.6L No Start VIN: 1GTHK23264
Truck came in, it would crank but not start. Scanned for codes and found the above codes, however truck has a tuner kit on it, customer took it off trying to get the truck to start, not sure if he set any of these codes at that time. Cleared all codes, tried t... Trouble codes: P0404, P0401 (Egr insufficient flow), P1238 (Injector driver circuit 6), P1229 (Injector driver circuit 3), P1241 (Injector driver circuit 7)
2005 GMC Envoy SLE 4.2L cylinder head VIN: 1GKDS13S95
vehicle came in with a misfire,chek engine ligth on,P0305,i replaced the sparkplugs an d also checked the compression on #5 ,snd is 0 psi,the engine is running rough ligth is on (MIL),the customer wants to do the proper repairs (head job),but, i have not done ...
1993 Pontiac Bonneville SE 3.8L master cylinder VIN: 1G2HX53L8P
When the brakes are applied coming to a normal stop, the pedal will feel normal for a second and then drop slightly before becoming firm again. It feels like the master cylinder is bypassing, but it's been replaced twice. I'm leaning towards an ABS hydraulic m...
2000 Saturn SL2 1.9L Harsh reverse VIN: 1G8ZK5270Y
Vehicle came in for a harsh reverse intermittent engagement. We rebuilt transmission and problem is still there. We have torqued both input and output shaft nuts to 111ft lbs. and warrantied the valve body (vbx) but still has the problem. When vehicle sits for...

Fixes & Summaries for GM
Fix/Summary Answers
1992 Cadillac Eldorado Touring 4.9L Excessive Emissions VIN: 1G6EL13B4N
I thank all who replied. The customer took the car out without a fix. If I opened the EGR by hand the NOX and all reading would go to normal. I think the first help tip I got about the Prom was probably the fix. Wish the customer would have gone for it so I wo...
1997 Cadillac Seville STS 4.6L MIL Lamp on VIN: 1G6KY5297V
Closing this request. I received a few replies adn am thankful for the info but none of the information provided was of any use. This vehicle will be back in and I will update this post with a fix at a later date. Trouble codes: P0137 (Ho2s circuit low voltage bank 1 sensor 2), P1139 (Ho2s insufficent switching bank 1 sensor 2).
2008 Cadillac Escalade ESV 6.2L Hesitation, Stall, MIL Lamp on VIN: 1GYFK66818
Well, thanks to all that replied. I went over this vehicle several times- all grounds and harness connectors, had it here on & off for 2 weeks, long road tests ran through almost 2 tanks of fuel. I finally took the advice of "Brian from Illinois" (and William ... Trouble codes: P2135 (TPS correlation incorrect), P2119 (Closed throttle performance fault).
2002 Chevrolet Tahoe LS 5.3L No Start VIN: 1GNEC13Z42
Thanks for all the great ideas and guidance. I opted to replace the ignition switch since I knew it was a problem from the beginning. However, afterward the gauges still didn't work. I checked my input voltages to the I.P. and found 4 volts on the ign B circui...
2002 Chevrolet Impala LS 3.8L battery light VIN: 2G1WH55K22
Group, I ran over all previous repairs. I even went so far as to replace the alternator again as per some suggestions here and still the light stayed on. The eventual repair was a short in the cluster somewhere. I traced wires till i was blue in the face and e...
2007 Chevrolet Equinox LT 3.4L shift solenoid 3 VIN: 2CNDL73F77
There was an internal bulletin for the symptoms that i have and it falls into the vin range on this vehicle. THANKS to JAMES AVERY for his help on this. There is still some confusion on this matter. The bulletin states that there is a driver failure internal t...
1994 Geo Metro 1.0L High gear starts VIN: 2C1MR2460R
I was right the first time. It was a bad TCM. The used TCM that I put on had the same problem as the first one. Trying another used TCM fixed the problem.
2004 GMC C6500 Topkick C6C042 7.8L starter VIN: 1GDJ6C1336
UPDATE: Thanks to all who responded! The truck is still not fixed. Checked grounds and battery connections, etc. I suggested to my customer that we try a new starter. He didn't want to spend the money unless I could guarantee the truck would be fixed. I ...
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