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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for August 13, 2013
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Open Help Requests for GM
Help Request Answers
2003 Chevrolet S10 4.3L Misfire VIN: 1GCCT19XX3
Counts miss fires on cylinder 4 in park from 2000-2500 rpm. Runs perfectly smooth. Unplug MAF or MAP and miss goes away. Trouble codes: P0300
2007 Chevrolet Silverado 1500 LT 4.8L locks gauge stability VIN: 2GCEK13C17
very intermittent problem, driving door locks start cycling service stability message lights up gauges fluctuate loses power sometimes, sometimes windows wont work, only codes that will set are in EBCM code c0161 brake light ciruit, u0073 bus communication, re...
2007 Chevrolet Silverado 3500 Classic LS 6.6L Neutrals in Rev or Drive VIN: 1GCHK33D17
We have put in a new range sensor the pressure sensor assembly and a new computer and reflashed it. I have gone pin to pin at the TCM and watched each input and output. I have monitored the ign switch and batt wires at the TCM and they are good. I did notice w...
1992 GMC C2500 Sierra SLE 5.7L aldl VIN: 2GTGC29K7N
hello all having issues with communication have tried two scantools no comm, have tested wires from aldl to pcm all are good except one that goes to the trans then splices and goes to pcm for tcc driver? unplugged the harness at trans still no comm. could that...
2003 GMC Sierra 1500 HD SLE 6.0L Drive-axles VIN: 1GTGK13U13
Looking for some 4wd expertise. This truck sounds normal when driving in 2wd. After putting it in 4wd it will intermitanly make a noise that sounds like a stick in the spokes of a bicycle. Noise goes with speed of the truck. Goes away when put back in 2wd. Whe...
2007 Hummer H3 3.7L Hesitation VIN: 5GTDN13E47
truck has hesitation on acceleration. not as bad while cruise is on. has new plugs. stick on this one any help would be greatly appreciated Trouble codes: P0300
1996 Saturn SW2 1.9L Rear brakes VIN: 1G8ZK8274T
Hey all, I recently replaced the rear brake shoes on this Saturn, cleaned and greased all contact & pivot points on backing plate, parking brake and shoes. Test drove the car with no problems, everything felt great. Customer called 2 weeks later with complaint...

Fixes & Summaries for GM
Fix/Summary Answers
2000 Buick LeSabre Custom 3.8L Starter VIN: 1G4HP54K9Y
Ok, I believe Joseph nailed this one. The suspect key was used in cloning the new key. We took the Valet key back to the store and they learned the new key off that one. So far it will not act up so I believe this one is fixed! Thank you all for the help!
2001 Cadillac Seville STS 4.6L MIL Lamp on VIN: 1G6KY54991
Iíve received nine responses to my request. Most responses recommended replacement of the remaining air control valve on bank 2. I learned from playing with this vehicle, just how the air valves operate. When the correct conditions are met, the ECM activates t... Trouble codes: P1415 (AIR system bank 1), P0420 (cat efficiency bank 1).
2000 Chevrolet Suburban 2500 6.0L No Start VIN: 3GCGK26U6Y
Thanks for the replies. Customer decided to run on the main tank for now and worry about the other tank/sender later (the truck also just developed the dreaded transfer case rub-through fluid leak). Hopefully I will have the opportunity to try your suggestions...
2002 Chevrolet Silverado 2500 HD 6.6L MIL Lamp on VIN: 1GCHC23142
Oh boy, this one is fixed. The lack of rail pressure demand was due to bad injection pump not putting out enough pressure. The P0101 was due to no vacuum supply to EGR solenoids from bad vacuum pump and EGR would not hold vacuum. This beung learned after I tho... Trouble codes: P1093, P0101.
2003 Chevrolet Monte Carlo LS 3.4L Start VIN: 2G1WW12E93
Replaced Passlock case only. Did 30 minute relearn and car is fixed. Thanks for the input.
2003 Chevrolet Malibu LS 3.1L Hesitation, Surge, Poor Fuel Economy, lack of power VIN: 1G1NE52JX3
good evening all and thank you for the replies. first off let me say that we smoked and checked with carb cleaner and found no vacum leaks, int or ext. What i did see is that the knock sensor was really retarding the timing when the problem would accure. If I ... Trouble codes: P0300.
2005 Chevrolet Corvette 6.0L drive shaft VIN: 1G1YY24U05
The customer has declined any further service to the vehicle at this time. Thanks to all that replied.
2007 Chevrolet Tahoe LTZ 5.3L Calipers VIN: 1GNFK13047
Well, thanks to everyone who replied. We checked the depth of the pushrod with a depth micrometer. Everything lined up. Tried unplugging the ABS, no help. Checked to make sure all pistons on calipers were moving. All good. Checked pad and rotor specs. A...
2007 GMC Sierra 1500 SLT 5.3L Accessories VIN: 2GTEK19J97
hey guys thanks for the replies i found the wiring harness rubbing on front shaft repaired harness all good
1998 Oldsmobile Aurora 4.0L dash lights VIN: 1G3GR62C0W
Success! Dan from Wisconsin was correct. The dash, heater, and radio lights were the only ones affected. This led directly to the left side dimmer module. We replaced the module and the lights all work properly now. Much thanks to all who offered help. Ron
2006 Pontiac G6 GT 3.5L No Start VIN: 1G2ZH15806
Cust took the car, we haven't heard back yet. I know a scan tool guru, who sees everything, and he has seen more than one GM with a mystery no start where the shop did a BCM and the problem was still there. A tip from him was that the power wire from the under... Trouble codes: U7300 (PCM Communications lost), U2105 (BCM/VTD lost comm to PCM).
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