GM Automotive Technicians Technical Discussion and Fixes for Mar 8, 2012 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	2004 Cadillac DeVille DTS 4.6L Trunk Springs VIN: 1G6KF57984 Hello and thanks for the help in advance. Customer brought vehicle into shop and had engine repairs done. After finishing, the customer asked us to repair the trunk. Customer told us the trunk will not go up after releasing the latch. So we inspect it and find...	View
	1996 Chevrolet Express 3500 5.7L Hesitation, Surge, Cuts out VIN: 1GCHG35R4T This van came in from another shop, opening the hood i found lots of shinny new parts, the simtoms are that under a load it has no pwer anr runs like a plugged exhaust or no fuel, so far ive check vacuum when symtems occer its normal,checked fuel trim and look...	View
	1998 Chevrolet C3500 Cheyenne 5.7L ignition switch security VIN: 1GCHC34R5W i am working behind many people . the vehicle starts and runs with a computer for another vehicle .not my doing . the passlock module has been replaced .the relearn procedure never gets past the security lifht flash . it never flashes .	View
	2001 Chevrolet Blazer LS 4.3L Hard Starting VIN: 1GNDT13W71 Greetings! After the initial start in the morning, the engine requires excessive cranking to start - slight pressure on accelerator seems to help. Coolant temp reading appears correct. Tried known good MAF sensor. Fuel pressure holds when shut off and vehicle ...	View
	2001 Chevrolet Silverado 1500 5.3L heater VIN: 1GCEK19TX1 help heater doors/no blend	View
	2003 Chevrolet Impala LS 3.8L no start VIN: 2G1WH52K93 hello everyone, need some help please. i have a 2003 chevy impala that has an intermittent no start, no crank problem. of course at this time it is operating properly, the one good thing though is that it has codes. the codes are b2960 security system sensor d...	View
	2003 Chevrolet Monte Carlo SS 3.8L headlights VIN: 2G1WX12K63 Ive got an 03 monte carlo that the headlights flash randomly. customer has had it to several places but it wouldnt do it for them but now it is worse. I am a teacher at a high school and all we can do is run codes, we dont have a good scanner to monitor any mo...	View
	2003 Chevrolet Malibu LS 3.1L Misfire VIN: 1G1NE52J73 Well I have a fun one here. This 03 Malibu came to us with a dead #1 cyl. we found the exhaust valve rocker stud pulled up. After repairing that we now have misfires on #1 and 4 cyls. I have swapped coils, no change. Tried known good ICM, no change. Scoped cra... Trouble codes: P0301, P0304	View
	2004 Chevrolet Silverado 1500 4.8L Intermittently Not VIN: 1GCEK14V34 Truck was towed in with a dead battery, died while driving. Day before cluster only worked intermittently, when it was not working the entire cluster was dead not just a portion of it. Today it didn't work at all and truck ran until battery went dead, radio st...	View
	2002 GMC Envoy SLE 4.2L lifter ticking VIN: 1GKDT13S22 The engine sounds like it has a lifter tick on all clyinders. It stay about same noise from idle to cruising down the road.	View
	2005 GMC Sierra 3500 SLE 6.6L low power VIN: 1GDJC33275 this truck came in with code p1093 in history, light off. We have a tech2 so ran frp up to 160mpa, no problem. Power brake in shop also no problem but on the road any heavy request pulls frp back to 7500psi. If I let up it will come back and run fine until I g... Trouble codes: P1093	View
	2006 GMC Savana 3500 6.0L MIL Lamp on VIN: 1GDHG31U36 this truck came in idling high ,had a code p0507 , the idle control motor sticking , replaced the throttle boy , then truck was idle fine ,a week late the truck return with the same code and interm. mil light i took the truck for a ride and found no problem i ... Trouble codes: P0507	View
	2005 Saturn Vue 2.2L MIL Lamp on VIN: 5GZCZ33D95 Vehicle is a used car that was being safety inspected. During a smog inspection we found P0455 stored in ECM. The used car tech promptly cleared the code and drove to retest. After a road test check engine light illumiated with P2000 stored. I cannot find any ... Trouble codes: P2000 (Nox trap efficiency bank 1)	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	2000 Buick Regal LS 3.8L Climate Control Head VIN: 2G4WB52K7Y Re-soldered eight little pieces on board. These where black and had a #421 on them. Don't know what they are or what they do. I could not physically see anyhting wrong with the solder connection even with a magnifying glass and bright light. The solder con...	7
	2001 Buick Regal LS 3.8L Poor Idle Quality, Hesitation, Cuts out, Misfire, MIL Lamp on VIN: 2G4WB55KX1 Thanks to everyone for your input. I went back to the basics and found the problem. High resistance at trans bellhousing ground connection. I was checking ground from pcm found high resistance then I pulled grounds loose from trans and found corrosion causing ... Trouble codes: P0300.	30
	2003 Chevrolet Trailblazer LTZ 4.2L Hydraulics VIN: 1GNDS13S63 After all was said and done it boiled down to a simple "operator error" issue. We analyzed our entire procedure and revealed that during the simple replacement of brake pads that the brake bleeders were not opened during the installation. We have all done it m...	12
	2006 Chevrolet Impala LS 3.5L No Start, Stall VIN: 2G1WB58K46 thanks to all who replied with suggested fixes. several noted that a tech ii would be nice. for the record i do have one. two replies suggested that something was pulling the communication network down. after clearing codes and driving vehicle 50 miles. it ne... Trouble codes: B1000 (System 36).	14
	2008 Chevrolet Express 1500 4.3L MIL Lamp on VIN: 1GCFG15X68 thanks for all the replies,what I found was battery cables were modified with new bolts that have studs to ad on more cables,the bolts were to short and came loose both cables were very loose I am surprised the vehicle even started.I installed 2 quality cable ... Trouble codes: P0641.	6
	2007 GMC C5500 Topkick C5U042 6.6L map sensor VIN: 1GDE5C1257 Relocated MAP sensor per bulletin, replaced broken air cleaner housing. Truck seems to be fine, no limp mode in a week. Oil in the intake seems to be normal on the Duramax. Thanks to all who replied.	8
	2002 Saturn SL2 1.9L MIL Lamp on Thank you all for your help after following gm's trouble chart it seems that the vehicle needs a new pcm. The customer declines doing the repair at this time and is going to come back when he wants to repair the vehicle. Trouble codes: P0418, P1418.	3

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