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Prev Professional Automotive Repair Technical Discussions for April 11, 2014
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Open Help Requests for GM
Help Request Answers
2006 Cadillac STS 3.6L Fill Procedure VIN: 1G6DW67766
Thank you in advance for any advise. We have this 06 STS in for transmission service. Mitchel is vague on refill procedure. We see a drain plug on the bottom. Is this one like the VW's or Ford Explorers that you refill through the plug? I have the Assenmacher ...
1971 Chevrolet C30 Pickup 6.6L hoses
Does anyone know where the vacuum hoses for the HVAC goes. The control switch has 3 ports, labeled 1,2,3. The only vacuum motors are recirculate, heater valve, and a fresh air inlet on the passenger side, 3 total. Everything else is cable. I started this wor...
1998 Chevrolet Tahoe LS 5.7L brake pedal VIN: 1GNEC13RXW
This Tahoe came in with the brake pedal going to the floor and since we couldn't find any leaks we installed a new master. It didn't help a bit but while bleeding it seemed like we couldn't get all the air out. We pumped so much brake fluid through it that I w...
2001 Chevrolet Impala 3.4L ignition VIN: 2G1WF55E21
have a impala that came in for no start diag. found vehicle to have bad ignition module/pass lock replaced now vehicle won't set security light to do re learn has a u1000 comm. code. you can communicate with bcm but new ignition isn't setting any passlock code...
2002 Chevrolet Silverado 1500 4.8L Starting VIN: 2GCEC19V12
We removed the transmission to replace the rear main seal and now the truck wont start. Hooked up the scan tool and the transmission range matches from the shifter to the scan tool. starter connections are good. have rechecked all connections. security light d...
2006 Chevrolet Impala LT 3.5L Battery VIN: 2G1WT58K86
This vehicle was purchased from a car lot 1 week ago. I have no history on the car other than the car lot put a battery in the car on Tuesday when our customer bought it, then another (a Super Start this time) the following Saturday because the battery was dea...
2007 Chevrolet Avalanche LTZ 5.3L Poor Idle Quality, Hesitation, Stall, MIL Lamp on VIN: 3GNFK12387
This truck came in with a dead #7 cylinder caused by a failed DOD lifter and a reduced power light coming on. The customer wanted the system eliminated and the engine resealed. We removed the engine and replaced all the lifters, cam, and all engine gaskets. Af... Trouble codes: P2135 (TP 1-2 Correlation), P2119 (Throttle closed performance), P2101 (TAC Motor circuit range/performance), P1516 (Electronic Throttle Mod VS Throttle position performance), P2176 (Minimum Throttle Position not learned)
2007 GMC Acadia SLT 3.6L trans VIN: 1GKEV23707
Hello GM tech's. I've replaced this automatic trans and I'm curious if I need to reprogram the TCM to the PCM in order to get proper trans function. I know I need to perform an adaptive learn procedure but I'm not too sure if a reflash is necessary to complete...
2008 Pontiac G6 2.4L Mechanical VIN: 1G2ZF57B48
Good Morning IATN, I have a 2008 Pontiac G6 with a 2.4L Eco Tech. The vehicle was towed in for a no start and coolant leak. Upon inspection I noticed the customer had hit something in the front of the vehicle which busted the radiator. Not realizing he had bus...

Fixes & Summaries for GM
Fix/Summary Answers
1996 Cadillac DeVille 4.6L Keyless entry VIN: 1G6KD52Y5T
As with alot of these seemingly complicated problems, it turns out to be something simple. The new customer supplied key fob was the problem. It looks like an OEM fob but I've found that the signal drops out sometimes. I got a new one from Cadillac and it work...
2008 Chevrolet Colorado LT 2.9L Poor Idle Quality, Surge VIN: 1GCCS39938
Someone crimped in the connector to the throttle body. We pulled all the crimps and soldered them. The customer so far has had no problems. Thanks for all the help! Trouble codes: P2135.
2002 GMC Sierra 3500 SL 6.6L Trans Shifting VIN: 1GTJK33132
Hello & Thanks To So Many Who Offered Us Up Help! We Monitored ISS & OSS Sensors With Tech2 & All Looked Ok.We Checked Fluid & It Was Clean & Full & Didn't Smell Burnt.We Found A TSB Referencing The PNP Switch Or Range Switch As TheySometimes Call It But P0735...
2004 GMC Sierra 3500 6.6L glow plug module VIN: 1GDJC34204
This truck is fixed!!! Finally! I have been waiting on new controller for two days now. The first code temp sensor was fixed with a new maf, the p0670 was fixed with a new controller. vinnie, the truck started fine with the code, mike i had voltage at the solo...
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