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Professional Automotive Repair Technical Discussions for July 31, 2015 International Automotive Technicians' Network (iATN) - Members Only |
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Open Help Requests for GM
| Help Request | Answers | |
| 2002 Buick Rendezvous CX 3.4L trans fail safe VIN: 3G5DB03E72 This vehicle lost an alternator driving up from texas to utah. Since the alternator was changed out it has had some strange behaviors in the morning. The chime on the vehicle stays on and the transmission goes into fail safe mode and only has reverse and third... Trouble codes: P0620, P0560 |
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| 2005 Cadillac STS 4.6L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G6DC67A85 Random misfires, intermittently, when is misfiring B1 avg injector pulse is 3.5ms and B2 avg injector pulse is 7.3ms. Lambda values per bank are 1.250 and 0.950 not certain which value is for which bank. When problem is gone all values are close to each other ... Trouble codes: P0300 (Random misfire), P0305 (Misfire cyl 5), P0420 (Cat effiency B1), P0521 (Oil pressure sensor) |
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| 2006 Chevrolet Suburban 1500 Z71 5.3L a/c &heater fans VIN: 1GNFK16Z06 This vehicle has front and rear air and neither fan works. The compressor engages when turned on, everything else seems to work but both fans.Does the bcm control these, or the ignition switch? I don't have a wiring diagram for this vehicle, so can't trace. Th... |
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| 2007 Chevrolet Tahoe LTZ 5.3L radio VIN: 1GNFK13097 So, I played with this last week and did multiple system resets with batt terminals shorted for about 30 minutes. Every time I connected ammeter and turned on the key to wake computers up, everything would go to sleep to 0.21A within 1-2 minutes. Truck did hav... |
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| 2012 Chevrolet Impala LS 3.6L wont pass emissions VIN: 2G1WA5E38C This vehicle wont pass a state of Wisconsin emissions test. o2 and evap monitors wont set. Vehicle is very low miles and just out of warranty by date. Another shop tried running the drive trace on dyno but didnt work. We reflashed vehicle in case of a corrupt ... |
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| 2004 GMC Savana 3500 6.0L No Start, Cuts out VIN: 1GDHG31U84 I had no crank, no start. No codes on all modules. No spark, No fuel pressure. Replaced the pcm and still had same symptoms. Then I found that fuse #2 in the underhood fuse box was blown. The vehicle started up and ran fine. Though maybe the pcm was the source... |
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| 2008 Saturn Vue XE 3.5L No Start, Stall, MIL Lamp on VIN: 3GSDL43N08 Hi all! This car came in as a no crank. Turn key on and Abs and service vehicle lights flicker and tach and gas gauges bounce. I could not communicate with PCM, BCM, Instrument cluster, ABS, or Air bag. On occasion I can communicate with Trans module and got t... Trouble codes: U0073 (u0100-), U0100 |
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Fixes & Summaries for GM
| Fix/Summary | Answers | |
| 1997 Chevrolet C3500 Cheyenne 7.4L Poor Fuel Economy, No power VIN: 1GBKC34J3V The owner decided to buy a used motor rather last buy new fuel injectors. After hours of checking, here is what I found. Pressure drop to be too much, backpressure IS 1.5 psi, dropped exhaust on both sides & it ran the exact same, no power. Deadhead pump & en... |
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| 2013 Chevrolet Silverado 3500 HD LT 6.6L Electronic VIN: 1GC3KZC88D thank you to dean from texas and kevin from ohio.the tcm fixed the problem and i was able to program with snapon pass thru pro .thanks guys |
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| 1997 GMC C1500 Sierra SL 5.7L Cuts out VIN: 2GTEC19R9V Thanks to all that replied, they were all good tips.. I did get this truck to finally die on me. What i found was the fuel pressure was dropping to 40psi.. not enough to let the truck run. I figured I was losing voltage or ground to the pump.. I tried a new f... |
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| 2006 GMC Yukon Denali 6.0L passenger side window VIN: 1GKEK63U76 Hi everybody, thanks for the help, and thanks to Doug, I was really confuse on the diagram I first printed because it didn't have the all the wires of the connector for the window switch, so I though it was only one power going to the switch and not two powers... |
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