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Prev Professional Automotive Repair Technical Discussions for May 14, 2012
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Open Help Requests for GM
Help Request Answers
1985 Chevrolet Camaro Sport 2.8L Cooling Fan VIN: 1G1FP87S7F
Off the road for the past 6 yrs (no rodent damage found), cooling fan will always run switched on by ECM, as long as engine is running. KOEO will not run until engine is started-if engine stalls, cooling fan stops. Removing c.f. to ECM ground circuit will shut...
1999 Chevrolet Lumina LTZ 3.8L misfire VIN: 2G1WN52K3X
hi i have this lumina with p0300 any one with some help please temp-204 short term fuel trim -7.5 long term -9.3 shorth trim 3- 84.3 long trim 3-64.8 air flow 5.14 i have mil flashing and if i desconnect the maf it will stop flashing but will not stop feeling ...
2001 Chevrolet Express 3500 5.7L Misfire VIN: 1GCHG35R21
Hello, I have this van here that is giving me a headache. It came in for a misfire. I found that #2 injector was bad. Suspect poppet stuck. BTW this is a spider injector system. I replaced the injector and lower intake gaskets that were leaking. After I was fi...
2003 GMC Yukon SLE 5.3L Sunroof VIN: 1GKEK13Z13
HI All. Vehicle came in for Mil on and Sunroof open not closing. When the switch is operated there is slight movement from the sunroof in both directions.Scan test BCM =B1440.B2958,B2961,U1000.Monitor Data for possible intermittent power mode lost.Could not du...
2007 GMC Sierra 2500 HD SLT 6.0L MIL Lamp on VIN: 1GTHK29K57
This is a nightmare truck. Truck will divert to transmission limp mode and gauges will flutter when problem occours. PCM, TCM, BCM, ABS all loose communication. I have not been able to duplicate the situation in the shop. Problem will happen sometimes once a w... Trouble codes: P0575, P0700, P2544, U0101, U0102, U0100

Fixes & Summaries for GM
Fix/Summary Answers
2001 Buick Century Custom 3.1L Oil gauge VIN: 2G4WS52JX1
2007 Cadillac STS 3.6L Exterior trunk release VIN: 1G6DW67737
Customer decided not to spend any more time on the repair as she didn't care if the exterior trunk release worked or not. Thanks to David for an excellent circuit description. I was remiss in not stating I'd verified the valet switch in my original post. Had ...
2006 Chevrolet Silverado 3500 LS 6.0L No Start VIN: 1GBJK34U56
Thank you for helping us with this problem. I received several helpful responses, particularly from the following: Mark and Wayne, both from Illinois, Alex from Georgia, Sisira from United Arab Emirates, and Dave from Ohio, that have helped us to isolate the ... Trouble codes: B2948 (Security System Sensor Power Circuit High), B2958 (Security System Sensor Data Circuit High), B2961 (Key in Ignition Circuit).
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