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Prev Professional Automotive Repair Technical Discussions for June 20, 2011
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Open Help Requests for GM
Help Request Answers
1997 Cadillac Seville STS 4.6L MIL Lamp on VIN: 1G6KY5297V
Getting codes P0137 and P1139. Have followed the trouble trees for the codes to no avail, all wiring checks out and a new pcm was installed but it didn't fix the problem. The precat O2 sensor will stay at .080 volts and occassionally will switch like the upstr... Trouble codes: P0137 (Ho2s circuit low voltage bank 1 sensor 2), P1139 (Ho2s insufficent switching bank 1 sensor 2)
1991 Chevrolet P30 7.4L Excessive Emissions, Poor Idle Quality, Hesitation, Surge, Cuts out, Stall VIN: 1GKP37N9M3
Engine would stall and surge when it first arrived to the shop. No codes would stored nor were we able to store them. Communication with computer was hard to come by. Computer was defective. Eprom installed was not the correct unit according to vin, ecu, tbi, ...
1995 Chevrolet Blazer 4.3L 2-3 Shift VIN: 1GNDT13W0S
This goes out to you GM tranny gurus out there. This thing is beating me up. I'm about to take the trans out for the 3rd time, but before I do I need to make sure we're not missing a possible electronic problem. The beast flares up on the 2nd shift and will fe...
1997 Chevrolet Monte Carlo LS 3.1L fuel gauge VIN: 2G1WW12MOW
Hey guys Im looking for a little assistance here on this Monte Carlo. The fuel gauge will not come off of full. Ive tried everything. The customer put in a sending unit and I put in a cluster. Does anyone have a testing procedure for this and maybe a wiring di...
2000 Chevrolet Blazer LS 4.3L Tcc VIN: 1GNDT13W4Y
Hello Trans. techs. Transmissions are not my strong point so I could use some help. This one came to my shop with the CEL on and a P0740 (open/short) TCC solenoid code. No other issues no other codes. shifts fine 1234 but no lock up. I'm aware of the ignition ...
2001 Chevrolet Suburban 2500 6.0L high idle VIN: 3GNGK26U31
Throttle body is clean, Coolant temp seems ok, tps ok, intake air temp ok. Idle is normal on cold start up for a aplit second then goes to 2000 rpm, idle creeps up to 3000 rpm as engine warms, can block off iac passage in throttle body and idles drops to 400 r... Trouble codes: P0507
2002 Chevrolet Venture 3.4L No Start VIN: 1GNDX03L02
Hello I have a Venture with a no spark condition. Customer shut off vehicle in dooryard, would not start next morning. Would not fire off of Carb cleaner so went to Mitchell no spark test. Have no spark on any coil. Power and ground circuit test fine to Ign Mo... Trouble codes: P1189 (Oil Pressure Circuit)
2002 Chevrolet Impala 3.8L Over heating
The vehicle over heats well above 3/4 on the Instrument Cluster . The fans never turn on also the a/c is none operational With the scantool I can command high and low speed fans(activates relays) All the fuses have b+. Coolant temp works properly from cold sta...
2005 Chevrolet Silverado 1500 5.3L random VIN: 1GCEK19B75
Hello fellow techs. We have a real stumper here. Vehicle came in with complaint of vehicle automatically going into 4 wheel drive every few days while driving. We could not replicate the problem. We scanned computer and found no codes. When the vehicle "decide...
2006 Chevrolet Uplander 3.5L rear of car VIN: 1GNDV23166
Hello fellow techs. This uplander is the only on we see. It has a loud clunk from the rear of the vehicle, can't pick off which side. I have looked for rust residue around bushings and such, found none. We have bounced on the back of this thing with both feet,...
2006 Chevrolet HHR LT 2.4L Surge VIN: 3GNDA23P46
This vehicle is a personal vehicle. The symptoms are rpm surge while driving from 2500 to 4000 rpm when the power door locks begin to cycle locked and unlocked driving down the road. I found out that when the vehicle is in park or neutral the symptoms never oc... Trouble codes: P0013 (Cam postion sensor), P0014 (Cam positon sensor)
2007 Chevrolet Silverado 2500 HD Classic LS 6.6L MIL Lamp on VIN: 1GCHK24D57
This truck runs great, no chips or adders, Keeps setting the SES. I can clear the code and then reset the TC learn and after 2 ignition cycles it comes back with the p003a. I dont see the TC as a learned value on the TECH II, i can command the position of the ... Trouble codes: P003A
2005 GMC W4500 Forward W4S042 5.2L Excessive Emissions, Hesitation, Poor Fuel Economy VIN: J8DC4B1615
Truck came to shop two years ago with miss cyl 3 and injector problem(was able to scan with obd2 gen). Truck went to dealer for repairs, came back with same driving issues, tried to scann and could not, after ecm was replaced gen scann does not work? truck is ...
2000 Oldsmobile Bravada 4.3L T-case VIN: 1GHDT13W1Y
So now Bravada's back with service 4wd light. History code c0347 General System Malfunction. Customer stated that vehicle would throw service light on and transfer-case would make a shifting sort of noise. Drove it on an extensive test drive and was unable to ...
2002 Oldsmobile Alero GL 3.4L Starting VIN: 1G3NL52E92
Vehicle will crank on Acc. position, will start when turned to On position, will also start on Start position as normal. But it will always crank on Acc. position. Once engine is running and then turned off vehicle will not crank in any position. If key is rem...
1989 Pontiac Sunbird SE 2.0L Poor Idle Quality, Hesitation, Stall VIN: 1G2JB11K5K
Hello, i have a lovely problem child here, came in as a crank, no start, replaced a few blown fuses, (f/pump, ecm), car started, but ran poorly, like it was starving for fuel. retrieved a code 13. a short time later, ecm fuse blows again, car stops running. ... Trouble codes: 13 (o2 sensor ckt open)
2002 Saturn Vue 2.2L Excessive Emissions, Poor Idle Quality, Hesitation, Stall, Misfire VIN: 5GZCZ43D72
Hello, I just installed a used engine in this vue, and at idle it is running very poorly(miss firing). I swapped the coil pack/control module from old engine, no change. Checked timing, it is dead on. Smoked the intake, and no leaks appear. It has brand new a...

Fixes & Summaries for GM
Fix/Summary Answers
2003 Cadillac CTS 3.2L caliper? VIN: 1G6DM57N83
Sometimes it is the simplest was the calipers. Not sure which side fixed it, we replaced both front calipers with NAPA reman, and the problem was gone. Thanks for all that replied!!
2004 Cadillac SRX 4.6L fuel guage VIN: 1GYEE63A14
i did check the wiring to the fuel sending units and it was backwards corrected that no change on level borrowed a different scanner but was not able to get into the instrument panel to control the guage manually the bulletins tat were mentioned i had already ...
1999 Chevrolet C1500 Suburban 5.7L The Whole Truck VIN: 3GNEC16R7X
2001 Chevrolet Blazer LT 4.3L Steering Column VIN: 1GNDT13W91
Thank's everyone for replying.I ended up taking the column apart and lubricatrd everything I could find in the column. I also lubricated the seal in the firewall where the column goes through just to make sure I covered all my bases. The customer has been driv...
2004 Chevrolet Silverado 1500 5.3L Noise VIN: 2GCEK19T44
I did not fix the truck cause the customer moved away. My IATN rating be damned I guess because I have know useful info regarding this truck. Everyone had great advise thanks!
2008 Hummer H3 3.7L Misfire VIN: 5TGTEN13EX
Sorry for the lapse in reporting info on this vehicle guys , the customer decided to trust this thing to go on a two week vacation. So i was waiting to hear from them . They said the ck eng light did not come on on for the entire trip , (app. 3k miles)They wer... Trouble codes: P0300.
1996 Pontiac Grand Prix 3.1L body VIN: 1G2WJ12M4T
Hello Everyone! Sorry I'm late closing this help request. There were alot of good replies. I did check the fasteners website and didn't find anything. Looked through the NAPA catalog and didn'find anything . We are going to go ahead and use some panel bonding ...
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