GM Automotive Technicians Technical Discussion and Fixes for Jan 29, 2013 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1997 Cadillac Eldorado ETC 4.6L MIL Lamp on VIN: 1G6ET1299V Replaced purge valve and tested vehicle for leaks .Vehicle has passed smog with all monitors done ,light will stay off between 70 to 120 miles then comes back on. Trouble codes: P1441	View
	2003 Cadillac CTS 3.2L no drive VIN: 1G6DM57N83 Hello all, I am not an internal transmission tech, and when this CTS came to me with a slipping transmission problem, it had no communication with the TCM, and on the engine side it had a P0700, trans control fault code. I reccomended the customer replace the ...	View
	1994 Chevrolet C1500 Cheyenne 4.3L Poor Idle Quality, Stall VIN: 1GCDC14Z5R OK hot rodders, this one's for you. I've got a '94 Chevy C-1500 that I have swapped a small block 400 into. The engine ran great with a big block throttle body and actually got decent fuel mileage. Recently I have swapped a TPI unit in from an IROC Camaro. I c...	View
	2004 Chevrolet Silverado 1500 LS 5.3L MIL Lamp on VIN: 2GCEK13T94 Bought the truck a couple of weeks ago. They completed the service and detail. Washed the motor. When i picked up the truck it set a code for bank 2 knock sensor. Took the truck back to dealership. They replace both knock sensors and harness. Picked the truck ... Trouble codes: P0327	View
	2007 Chevrolet Silverado 1500 LT 4.8L Ignition VIN: 1GCEK19CX7 The vehicle cranks imediately when turning the ignition to the run position and continues to crank until turned off.	View
	2007 Chevrolet Trailblazer LT 4.2L Instrument lamps VIN: 1GNDT13SX7 We have this Trail Blazer. No isntrument lamps. The dimmer works for the odometer. From what I can see on the wiring diagram the BCM sends the voltage through the brown and white wire there is no voltage at the cluster or the A/C control head. The customer tel...	View
	2007 Chevrolet Silverado 1500 LTZ 5.3L Gauges, Tach., Radio, Starting VIN: 2GCEC13J17 Vehicle came in for loss of gauges and radio intermittently. When this condition occurs I can not communicate with the following modules: IPC, Keyless Entry, Passenger Presence System, Theft deterrent, & TPMS. Also there are the following warning lights illumi...	View
	2009 Chevrolet Cobalt LT 2.2L Hesitation, Cuts out, Stall, Misfire, MIL Lamp on VIN: 1G1AT58HX9 Hi, This is the wifes car,it will act up in the shop under a light brake tq.1200rpm. It will jerk and misfire and sometimes die out, starts right up, It only starts to act up after it is warm 165deg and up. It will miss and if you throttle hard it will backfir... Trouble codes: P0106, P0138	View
	2011 Chevrolet HHR LT 2.4L Steering VIN: 3GNBACFU7B good morning this car will pull to the left only if you hit a bump and it dose not have to be a big one if you drive on a flat road the car will go stright for a long time the car has new tires i swaped right to left did not change	View
	2005 GMC Canyon Z71 SL 2.8L Timing chain VIN: 1GTDT19865 Good afternoon. I'm working on this GMC Canyon 2.8l 4*4. The engine needs a timing chain. I started disassembling it. I removed the air intake, cam cover and varous other parts. I am now on the timing cover and can't seem to get it loose. I am using AllData fo...	View
	2006 GMC Envoy Denali 5.3L speedometer VIN: 1GKET63M46 The speedometer doesn't work 95% of the time. Also the odometer won't move either. Every once in a while the needle will bounce on up and then fall while driving. Actually caught it bounce to 10 and fall back to 0 mph while sitting. Vehicle speed input is good...	View
	2008 GMC Yukon Denali 6.2L rear air ride VIN: 1GKFK63818 service suspension light on dash codes c0590 and c0585 right and left rear actuator circuit I removed connectors at both rear shocks and they were corroded cleaned reinstalled data on scanner looks good i replaced the air pump because it would build pressure b...	View
	1992 Pontiac Sunbird SE 3.1L Misfire VIN: 1G2JB14T6N So what I have is this. I have what appears to be a cylinder misfire on #3 near the firewall, I have good solid fuel pressure at 55, I have tested spark with two different spark testers one that can be adjusted to show the spark jumping a gap to test the stre...	View
	2000 Saturn SL2 1.9L Ignition Lock Cylinder VIN: 1G8ZJ527XY I am trying to replace the ignition lock cylinder on this Saturn, the old one was worn and binding. The procedure says to install the lock cylinder with the key in it and the ignition switch in the "Accessory" position. The problem I have is with the key in th...	View
	2001 Saturn SL1 1.9L Pcm VIN: 1G8ZG54821 I come from a Jeep Chrysler Dodge dealer, my only other automotive experience so there was a bit of a learning curve picking up the flashing procedure using the Vetronix ES6510 considering there were NO instructions beyond actually hooking everything up. Combi...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	2001 Chevrolet Malibu 3.1L No Start VIN: 1G1ND52J01 I,m a little unsure which of two actions repaired this problem. I began by unhooking the battery to allow the BCM to reset. I left the battery unhooked for a day & a half. When I hooked the battery back up the battery had gone dead while unhooked. I charged & ... Trouble codes: B3031 (Security system in learn mode).	11
	2003 Chevrolet Suburban 1500 LS 5.3L Mechanical VIN: 3GNFK16Z33 Most of the replies suggested pulling the pan to check filter and for chunks of metal. I drained the fluid and there is fine metal particles in the fluid, after removing the pan I found a lot of debris and the filter installed correctly. I suggested taking the...	16
	2004 Chevrolet Silverado 2500 6.0L heat After a drain and flush we picked the front of the vehicle on the lift we ran and filled vehicle all hoses hot now good quick heat.This has been a humbling experience. I appreciate the many responses and much help. I was leaning toward the blend door but half ...	13
	2005 Chevrolet Cobalt LS 2.2L Low Beams VIN: 1G1AL54F45 Well guys Thanks to all of you that have replied !! we have learned a few things about this system. The BCM only controls the High Beams ,the low beams are turned on by the headlamp switch.Asked another one of my Techs to help me with this. We found that I had...	9
	2008 Chevrolet Malibu LT 3.6L timing chains VIN: 1G1ZJ577X8 I had already pulled the starter and checked that it wasn't stuck in the ring gear, it wasn't. I pulled all the plugs to check for hydrolocking. I am going to recommend customer call the dealer they bought the car from to see if it is covered by any warranty.	11
	1998 GMC K2500 Sierra SL 5.7L Hazard lights VIN: 1GTGK24R9W Closed with fix. OK,, here is story. A guy a work with was working on the switch a few days ago while I was on the road and he was asking my questions. I pointed him to the switch after he told me all fuses were good. He changed switch after 2 from junk yard h...	7

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