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Prev Professional Automotive Repair Technical Discussions for August 31, 2009
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Open Help Requests for GM
Help Request Answers
1993 Buick Park Avenue Ultra 3.8L keyless entry/twilight sentinnal VIN: 1G4CU5314P
Vehicle came in w/ keyless entry inop. System wouldnt go into program mode. Ran test and replaced RAC module. Also has twilight sentinal that never turns off unless turned off manually. Now keyless entry will go into program mode, but if vehicle sits for half ...
1996 Buick Riviera 3.8L Poor Idle Quality, Stall, MIL Lamp on VIN: 1G4GD2213T
We got this car the other day and it had a code p0102,Mass air flow circuit low.It had a new(reman by A1 cardone)sensor on it.Tested sensor for power and ground and both tested good.But,we had no output on signal wire.Replaced with new,reman sensor and still h... Trouble codes: P0102 (Mass air flow circuit low)
1999 Buick Regal LS 3.8L MIL Lamp on VIN: 2G4WB52K7X
Mass Air flow code Rear O2 heater circuit code and the front O2 not switching codes were the begining of my problems. We replaced Mass Air flow meter and wiring harnes to sensor. We replace rear O2 sensor for heater circuit, Replaced front O2 sensor and was co... Trouble codes: 1133 (O2 Insufficient Switch of O2 sensor)
2002 Buick Rendezvous CXL 3.4L MIL Lamp on VIN: 3G5DB03E72
i thought i would find a tsb on this, but havn't located it anyway the car was brought to me because the other tech could not figure it out. this is what i noticed. first there was no mil coming on like i was told. there were the codes p0121,p0122, p1122 then ... Trouble codes: P0121, P0122
2003 Buick LeSabre Limited 3.8L EBCM Module VIN: 1G4HR54K53
Vehicle came in with ABS light, Red Brake light, and Traction control light all on. Scanned vehicle with Snap On Modis and retrieved codes C1214 & C1255. One of those indicates an internal fault in the EBCM, the other just indicates that the PCM has turned on ...
1993 Chevrolet K1500 Cheyenne 5.7L 3-2 Shift Solenoid VIN: 2GTEK19K7P
This 4L60 goes into limp-in after driving 5 or 6 miles and sets a code 66- 3-2 Solenoid Circuit Fault. Power is fed on circuit 1149 from the transmission fuse to the solenoid, circuit 897 goes from the solenoid to the PCM and the PCM grounds it to actuate the ...
1997 Chevrolet Camaro 3.8L no start VIN: 2G1FP22P1V
I am just making sure that the only information the pcm uses to set spark time is the crank sensor, and cam sensor failure would not cause the PCM to not turn on the ignition coil. I have a good crank sensor signal at the PCM, but no signal for spark timing ...
1998 Chevrolet Malibu 3.1L security VIN: 1G1NE52M7W
Good day and thank you for the assistance, My "boys" swapped the engine in this car last spring at the local VOTEC where they attended. They also swapped the ign. switch from the car they took the engine out of. I know the engine ran good when they removed it ...
2000 Chevrolet Silverado 1500 4.3L lack of power VIN: 1GCEC14W3Y
this truck came in with a lack of power. i am the 3rd shop to get it. fuel pressure is 50 psi at idle which is to low. pinch the return line and it goes to 70 psi.i have replaced the regulator and main injector unit.fuel pressure when return pinched flustuates...
2000 Chevrolet Camaro 3.8L Poor Idle Quality, Hesitation, Misfire, MIL Lamp on VIN: 2G1FP22K1Y
Thanks for any help. The engine backfires through the intake manifold on snap throttle. Little rough on cold start but clears up when warm, about 160 degrees. Coils all fire but computer shows misfires on all cylinders, but #4, 3, and 5 are the worst. Injector... Trouble codes: P0300
2001 Chevrolet Impala 3.4L Instrument and radio lighting VIN: 2G1WF55EX1
Customer states instrument and radio lights go out intermittently. I checked all power and grounds. They are working fine now. Is there something that I might look for that causes this intermittent problem. Thanks, Bob
2004 Chevrolet Suburban 1500 LS 5.3L oil pressure VIN: 3GNEC16T64
GM techs please help!!Car came in with low oil pressure warning displayed on cluster. Tool a manuel reading and had six lbs at idle. Will max out at about 25 lbs at high RPM. Replaced oil pump and sending unit, still have same problem. There is no engine knock...
2004 Chevrolet Cavalier 2.2L No Start, MIL Lamp on VIN: 1G1JH12F84
Hello fellow techs, This was brought in as a no start, customer drove it in. Along with the codes listed, the head scratcher is that the milage currently states 18426 miles. At 6/5/08 we did service, the milage was 66233. The current oil change sticker on the... Trouble codes: P1631 (Theft-Password incorrect), U1064 (Loss of communication BCM/DIM/SBM), U1000 (Class 2 data link fault), B2960 (Passlock cylinder data incorrect), B1000 (ECU malfunction)
2006 Chevrolet Cobalt LS 2.2L Cylinder head VIN: 1G1AK15F46
Hi everyone, I'm just looking for a little advice here. I've been teaching for the last 10 years, but I've jumped back into the pool, and unfortunately I haven't been keeping up to date as well as I should or could have with the newer vehicles. I am looking at...
2006 Chevrolet Silverado 1500 HD LT 6.0L unknown VIN: 1GCHC23U16
when making a three point turn a binding noise happens when turning slowly right. noise went away after lubing front end. customer came back and said it was fine for a couple of days but started again. i can no longer duplicate the noise. i checked other posti...
2003 GMC Yukon SLE 4.8L fuel & charging guages VIN: 1GKEC13V63
this suv came in for fuel & charge guage incorrectly reading. both guages needles are rotating 360 degree and stuck in certain spot as it was biding and cannot continue to rotate. when turn the ignition on, first it might show correct reading, fuel guage may s...
2001 Oldsmobile Alero GL 2.4L ignition VIN: 1G3NL52T81
This car sat for around 6 months.Customer finally got enough money for us to work on it.Put ignition lock cylinder in and did a relearn.Car would not start so i took the ignition module from another car to try and car started right up.Sat and ran for a aout 30...
2007 Pontiac Grand Prix 3.8L low beam inop VIN: 2G2WP55287
any body seen this problem have no low beam and i could use any help i can get on this or anybody have any good wiring diagrams so i can really follow the circiut any help would be appreciated.

Fixes & Summaries for GM
Fix/Summary Answers
1994 Buick Regal Gran Sport 3.8L Stall VIN: 2G4WF15L6R
car is fixed! i was testing iac motor with remote iac actuator tool,checking throttle bore for restrictions etc,anyway while i was fooling with iac motor area i smelled gas,noticed the fuel pressure regulator was leaking around retainer clip,also leaking out o...
1998 Buick Century Custom 3.1L Surge VIN: 2G4WS52M4W
Ok i did a 30min cycle with the motorvac to clean injectors and decarbonize. problem could still be felt. Yes vehicle is in closed loop and tps & ect are steady, a/c had no effect, as stated before also problem present with maf disconnected. I would have liked...
1992 Chevrolet K3500 Silverado 5.7L every gear VIN: 1GBHK34K1N
Everyone was right about the drive gear turning the same speed as the engine Thanks for all the help We desided to install a new clutch and pressure plate, but that did not help. How sound will travel the problem was in the rear axle the bearing cap had a crac...
1995 Chevrolet C2500 Silverado 6.5L High Oil Pressure VIN: 1GCGC29FOS
Customer has declined any further work but most replies say to replace the oil pump that it has a pressure relief valve in it that may be clogged. Thanks Cliff
1997 Chevrolet K1500 Suburban 5.7L Misfire VIN: 3GNEC16R6V
1999 Chevrolet Silverado 1500 4.8L start & stall VIN: 1GCEC14V4X
I received a few potentially useful replies to my request. I had several references to the tech2 from members, i just havent ever had to have one for passlock relearn before and dont feel that it would have helped in this scenario either. It was suggested I ch...
1999 Chevrolet Malibu 3.1L ABS Module VIN: 1G1ND52J2X
well, the customer declined any further repairs regarding the ABS issue. However, we replaced the front rotors after we machined the originals, and the base brakes improved. thanks for all who replied and read the article.
2001 Chevrolet Impala 3.8L No Start
First, the fix for this car involved a complete understanding of the ignition system which was dicussed in great detail in a forum that is posted now in technical theory. Here's how it went down. After isolating the ICM from any outside forces by remov...
2002 Chevrolet Tahoe LT 5.3L lines VIN: 1G1YY32G5Y
thanks for the many replies,all but two said the only fix was a double flare and it helped convince the store manager the only fix is the best fix,esp on brake sys. having to wait one more day to replace the lost 1/4" adapter in my flare tool was no big deal,t...
2002 GMC Sierra 2500 HD SLE 6.0L Misfire VIN: 1GTHK29U62
Thanks to all that replied. Reprogram pcm and perform crank relearn was the fix. We tested inj and removed to check for trash. rechecked intake gaskets. checked exhaust back pressure. With the help of a locall gm dealer we were able to fix. They were as stumpe... Trouble codes: P0300.
1995 Oldsmobile 88 Royale 3.8L Interior Lights VIN: 1G3HN52K8S
Thanks for all the help and suggestions. Steve from New Mexico had the best idea of finding the branch point and individually fusing each branch with smaller fuses. Great Idea, that pointed me in the right direction. That direction led me to the passenger ...
2006 Pontiac Grand Prix 3.8L MIL Lamp on VIN: 2G2WP55266
well the vehicle left today. it turned out to be a dirty maf sensor. i pulled it and cleaned it. i do not understand how that made a difference but it did. thanks to all that sent help. i just needed some more ideas. vehicle passed deq emissions on saturday. Trouble codes: P0053.
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