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Prev Professional Automotive Repair Technical Discussions for September 27, 2011
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Open Help Requests for GM
Help Request Answers
1992 Chevrolet K3500 Silverado 7.4L Brakes VIN: 2GCHK39N4N
Put all new brakes on this in January, developed a pull to right on braking. Made it "better" by swapping front pads sided to side along with the tires. Took camping with 11' camper, experienced severe pulsation coming down mountain pass. Left front tire felt ...
1996 Chevrolet Camaro 3.8L Excessive Emissions, Misfire VIN: 2G1FP22K7T
Vehicle came in for failed emissions and running rough at idle. only rough at idle, at about 1500 rpm engine smooths out. Driving down road cannot feel missfire. found cylinder #1 dead at idle. Tested spark - good. checked for vacuum leak around #1 intake runn... Trouble codes: P0300
2002 Chevrolet Avalanche 1500 5.3L Temp VIN: 3GNEK13T52
Need some help on this one.truck came in temp would not move from hot to cold found bad temp motor replaced.now i move with scanner but din't move with controls. Replaced controler.now moves only full hot and full coldnothing in the middle.found tsb on moving ...
2003 Chevrolet Tahoe LS 5.3L Auto headlamps / DLR VIN: 1GNEK13Z83
As stated this is a ex squad or fire department unit. The auto on headlamps don't come on and daytime running lights are inop also. As is the shift indicator illumination,hardly visible in the dark, which is probably dash unit. I have checked all bulbs, fuses,...
2006 Chevrolet Silverado 1500 LT 5.3L Reduced Eng. Pwr. VIN: 1GCEC19256
Hello everyone, I now have two vehicles with similar problems on my lot - albeit not the exact same (either engine, and codes present). This current vehicle is a 2006 Chevy Silverado (5.3L) - Trouble codes: P1516 (Electronic Throttle Module vs. Throttle Position Performance)
1999 GMC C-Series Topkick C6H042 7.4L Electronic VIN: 1GDJ6H1D5X
Compaint was parking brake knob was broken, brake warning light and buzzer are on. Replaced broken parking brake knob and switch. Found parking brake did not hold. Found drum at rear of transmission came off. Remounted drum with new bolts. Now parking brake wo...
2002 GMC Envoy XL SLT 4.2L MIL Lamp on VIN: 1GKDT13S42
I have tried to resolve this problem for 6 months and still getting codes po1271 accelarotor pedal sensor 1 and 2 corelation Cruise does not work when this occurs, Replaced; Accelerator Pedal Sensor twice kept getting code and thought first one was defective..... Trouble codes: 1271 (app sensor 12 corelation), 1275 (reduced engine power)
2008 GMC Acadia SLT 3.6L evap core VIN: 1GKER23758
Hey GM guys, We have a 08 GMC Acadia in the bay, it came in for no ac, we sucked out the system and the system was empty, our policy is to recharge the system with dye, and allow the customer to drive the car for a couple of weeks. It came back in and the eva...
2008 GMC C5500 Topkick C5C042 6.6L MIL Lamp on VIN: 1GDE5C1958
This is a tow truck that belongs to a good friend and has been driving me crazy since July; I'm hoping someone can help steer me in the right direction. It all started in June when the owner replaced the air filter as routine maintenance. The filter was a dea... Trouble codes: P0101 (MAF sensor performance)
2004 Pontiac Grand Prix GTP 3.8L air bags VIN: 2G2WR54434
Car has codes B0026,B0044, open circuits in both deployment loops. I have no continuity between the four wires in the clockspring connector below steering column and SDM module connector. The wires are not grounded. Wiring diagram shows only one connector betw...
2003 Saturn Vue 3.0L Cuts out, Stall VIN: 5GZCZ63B13
I have 2003 saturn vue with the 3.0l v6 that will stall/cut out after 20 min drive. have replaced the crank sensor, ignition switch and bcm. sometimes it will only cut out and continue running and other times it will cut out and die. the only code i get is p16... Trouble codes: P1629

Fixes & Summaries for GM
Fix/Summary Answers
1997 Buick Park Avenue Ultra 3.8L Stall VIN: 1G4CU5210V
Well, thanks to eveyone for their suggestions. First of all, a new ign switch did NOT fix this problem. I didn't see any faults with ign feeds at pcm but still did the switch for the possibility of weird interactions with other modules going down. No dice- the... Trouble codes: U1255 (ABS module-class 2 comm fault), C1276 (ABS module- torque signal ckt fault), U1016 (BCM- lost comm with PCM), U1255 (ABS module-class 2 comm fault).
1997 Chevrolet K2500 Suburban 5.7L R/R Drum VIN: 1GNGK26R6V
we replaced the r/r drum and shoes again with dealer parts and the r/r emergency brake cable from the dealer. seems to be fixed thanks for the help and replies.
1999 Chevrolet Express 2500 5.7L MIL Lamp on, VIN: 1GBCG29R8X
Thanks to all who replied. Although i was reluctant to replace the VCM, i ordered a remanufactured VCM from my AC DELCO Vendor, installed and reprogrammed and then checked my oxygen sensor data. Everything is functioning as normal so i can safely say its fixed... Trouble codes: P0134.
1993 GMC C1500 Suburban SLE 5.7L Stall VIN: 1GKFK16K8P
Thanks for all the valuable replies from my fellow technicians. After reading the replies it was evident that these vehicle have some distributor related problems when the vehicle has high milage and after a full inspection of the ignition system this vehicle ...
2000 GMC Jimmy SLE 4.3L ignition VIN: 1GKDT13W3Y
ok this ones fixed thanks to all you guys help.ive never had this problem as i always mark the distributor very well before pulling it.my coworker not so much he showed me his mark wich was his finger marking a line in the dust on the fire wall next to many ot...
1995 Oldsmobile 88 Royale LSS 3.8L oil level sensor VIN: 1G3HY52K9S
Well, most of you said 7 out of 10 replies, that it is most likely the oil level sensor. I most likely disturbed it while changing the pan gasket. My advice would be to remove it before doing a oil pan on one of these cars. I have a new sensor to put in and ha...
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