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Prev Professional Automotive Repair Technical Discussions for November 27, 2012
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Open Help Requests for GM
Help Request Answers
2005 Cadillac STS 3.6L No Start VIN: 1G6DW67785
Car will not crank over, has no communications with any of the modules, came in with dead battery, have charged the cars battery and replace the battery in the fob. I am unable to pull any codes due to no communications. All fuses and relays test OK and I am a...
1997 Chevrolet Monte Carlo LS 3.1L engine VIN: 2G1WW12M4V
Hello again gm techs. This Monte Carlo came in as a no start. 4 times it started and ran for about 30 seconds. the last time it ran i watched the rpm reading on the scanner drop to zero just before it quit. It will show the 24x sensor staying at 163480. No rea...
2001 Chevrolet Express 2500 5.7L No Start VIN: 1GCGG25R21
Thanks to everyone for their time and input. I have this 01 Chevy Van with a 5.7L that VERY intermittently will not start. When it won't start (I finally got it to do it to me once in the past 2 weeks) it has no fuel pressure. I was set on it and ready to chec...
2003 Chevrolet Silverado 2500 HD 6.0L Misfire, MIL Lamp on VIN: 1GCHK24U03
I have a 6.0 gas in a plow truck that is driving me crazy. I did full tune up in it last fall and replaced both exhaust manifolds since they had broken apart and the studs had corroded off. After doing all of that the truck definetly ran better than it did whe... Trouble codes: P0300 (Random cylinder misfire)
2004 Chevrolet Tahoe LS 5.3L Transfer Case Control Module VIN: 1GNEK13Z74
Help all gm techs!! tahoe came in with intermittant code c0550. Suggested replacement of transfer case control module and programming new module per tsb #02-04-21-006e. Recieved and installed new module, requested info with tech 2 and downloaded latest calibra...
2006 Chevrolet C4500 Kodiak C4C042 6.6L Hvac VIN: 1GBE4C1216
Hi folks, I'm in need of some assistance with the blower motor/manual HVAC system on this truck. I don't have any tech info or wiring diagrams to diagnose this problem. I'm not getting any action out of the HVAC system, the blower motor resistance/relay pack ...
2007 GMC Yukon Denali 6.2L Poor Idle Quality VIN: 1GKFK63817
Cleaned throttle body and idle now sits at 1800-2000 when put in drive settles down. tap gas goes back up. my snap on verdict has an idle learn reset but as commonly seen it's not working. anybody know how to reste idle manually. I heard you have to hold gas p... Trouble codes: P0121, P2119, P2135

Fixes & Summaries for GM
Fix/Summary Answers
1990 Chevrolet R1500 Suburban Silverado 5.7L 1-2 shift VIN: 1GNER16K1L
FIXED FIXED FIXED,, ok first i wanna thank all u guys who i was emailing back and forth. so i removed the old seperator plate i noticed the 2nd feed hole check ball seat was **ucked. it was new GM plate too. with only 10,000 miles on it,also using steel check ...
1997 Chevrolet Monte Carlo LS 3.1L ignition VIN: 2G1WW12M4V
i have replaced both crank sensors with gm parts then replaced the pcm with a reman unit. the scanner now shows an rpm reading but will backfire like it is out of time.
2001 Chevrolet Impala LS 3.8L Cuts out, Stall VIN: 2G1WH55K61
After all testing, I went back to the original code and replaced the MAF sensor. Customer picked up vehicle and drove it for a week or so with no problems. They came in and paid the final bill and haven't heard from them since. I have no idea why the MAF se...
2005 Chevrolet Colorado Z85 2.8L Misfire VIN: 1GCCS14855
Replaced complete cyl. head w/ a new gm cyl head. Runs great thanks for all the help.It was a valve not completely seating. Trouble codes: P0303.
2007 Chevrolet Silverado 1500 Classic LT 5.3L transfer case electrical?? VIN: 2GCEK13Z77
Thanks for the help especially Bill. The problem was a broken wire going to the encoder motor in the harness. It was hard to find as when we checked for continuity it was always ok. The wire was "just making contact". Thanks for the help and advise ken
2007 Chevrolet Aveo LS 1.6L horn VIN: KL1TD56657
Thanks to everyone who posted a repair. I actually found another Aveo Notchback and listened with a stethescope for the relay. Located the relay inside the fuse box among other relays. The hatchback version of the Aveo has an external relay.
2003 Oldsmobile Alero GLS 3.4L Starting VIN: 1G3NF12E13
Found A/C clutch relay bad. customer took car three weaks ago. report is that all is well. Thanks
2004 Pontiac GTO 5.7L 4th gear VIN: 6G2VX12G24
Thanks for the replies. I replaced the AFL valve with the Sonnax valve and replaced both shift solenoids problem solved trans works great.
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