GM Automotive Technicians Technical Discussion and Fixes for Oct 19, 2011 - iATN (Members Only)

×

Join Now

Prev	Professional Automotive Repair Technical Discussions for October 19, 2011 International Automotive Technicians' Network (iATN) - Members Only	Next
(Also Available: All, Asian, Chrysler, European, Ford, GM.)
Vehicle Owners: If you are seeking an automotive repair professional to service your vehicle, visit the iATN Repair Shop Finder.

Open Help Requests for GM

	Help Request	Answers
	1999 Buick Century Custom 3.1L Cruise Control VIN: 2G4WY52MOX Greetings fellow techs, Got a 1999 Buick Century I could use some help on. Customer stated he was driving the car and the check engine light came on. He noticed at the time the cruise control quit working at the same time. Plugging in the scan tool showed a co...	View
	2000 Cadillac Seville STS 4.6L Oil level light VIN: 1G6KY5494Y The dash display always shows the oil level is low, The scanner shows it is normal. I replaced the sensor, still same problem, If I disconnect the sensor the scanner shows the level is low, if is jumper the connector, it shows normal, the dash display always s...	View
	1996 Chevrolet K1500 Silverado 5.7L transfer case shifter VIN: 2GCEK19RXT Customer had this towed in for being stuck in 4WD low. The fuse in the inside panel (25 amp) will blow every time you touch the transfer case electric shifter switch on the dash. If you push any button on that switch, the fuse blows. The 4WD low indicator ligh...	View
	2002 Chevrolet Silverado 3500 LT 6.6L message center VIN: 1GCJK33102 Customer complains of "low coolant" message displayed on instrument panel. Sometimes it takes about 2 minutes for message to appear, but it always comes on. Of course, the truck is never actually low on coolant. We have tried everything we can think of, replac...	View
	2002 Chevrolet Silverado 2500 HD 6.0L fuel gauge, temp gauge VIN: 1GBHC24U52 Approximately 10 to 15 seconds after turning off the ignition, the gas gauge will go from its rest position to reading the fuel level and the temp gauge will move till it reads 195 degrees on its own with the ignition still in the off position. Both gauges wil...	View
	2004 Chevrolet Silverado 1500 LT 5.3L No Start, Cuts out, MIL Lamp on VIN: 1GCEK13TX4 im out of hair to pull out .for two weeks now my truck wont start in the am u can crank on it and it will start then just die after the therd try it will run.my wifes 08 cobolt is doing the same thang.i set my truck back to stock with the programer.but no help... Trouble codes: P0332, P0740, P0785, P0753, P0785	View
	2005 Chevrolet Trailblazer EXT 4.2L Oil VIN: 1GNDT13S15 Customer bought vehicle about 1 year ago and it used about 3/4 quart of oil between changes and about a month ago it started using more oil. We changed oil and it has since used about 3 quarts for 1000 miles. I cant find a pcv so i was wondering if anyone else...	View
	2007 Chevrolet Silverado 1500 5.3L MIL Lamp on VIN: 1GCEC14C37 While scanning fuel pump data, vehicle starts out at 58 psi & when fuel pump module decreases pump percentage to bring pressure to desired pressure of 44 psi actual only goes to 54 psi and code sets . Trouble codes: P0191	View
	1995 GMC K3500 Sierra SL 7.4L Low power VIN: 1GDHK33N7S was brought in for poor idle and performance, sometimes on wot throttle snap it will pop through TBI unit and cover the shop with a ton of black smoke from exhaust. has not done this since the oxygen sensor was replaced now i just cant give it more than 1/4 th...	View
	2005 GMC Envoy SLT 4.2L engine VIN: 1GKDT13S55 Good day, you will need your a game for this one.. I have a situation where at start up cold or hot oil pressure is great after 45-60 sec gage fluctuates then drops to 0 and then lifters start to tap and message states to turn off enging for low oil pressure i...	View
	2006 GMC Envoy SLE 4.2L Stereo VIN: 1GKDT13S76 Hi all in IATN land. This Envoy has an intermittent problem with the rear speaker system. It is very intermittent and usually on start up. The right rear speaker will quit playing music and will emit a noise that sounds like alternator. If you disconnect, then...	View
	2007 GMC Yukon Denali 6.2L Srs VIN: 1GKFK63867 Vehicle was involved in a rollover. Repaired without airbags installed. Customer had no idea. We get the vehicle with srs light on. New airbag module we installed and programmed, then we find out missing airbags, 4 curtain airbags to be exact. We installed 4 n...	View
	2006 Pontiac G6 2.4L Surge, Stall, Power reduced VIN: 1G2Z1555B2 hello this G6 will intermentaly cut go into tranny limp mode and the IPC will flash gauges will drop and error will read on the odomoter i havent had much time to look at there was a list of codes that where in it and those codes were in the pcm only. I do kno... Trouble codes: P0976 (2-3 SHIFT solinod LOW), U0073, P0700, P2544	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	2004 Cadillac DeVille 4.6L no 3-4 shift VIN: 1G6KD54Y84 Thank you for the replies , some said a possible solenoid break, or od splines at this age & mileage I suggested a reman or teardown.	10
	1994 Chevrolet K2500 Silverado 5.7L Poor Idle Quality, Stall VIN: 2GCFK29K4R Thanks for all the help guys. We ended up leaning towards the distributor. Pulled it apart and replaced pick-up coil. Had vehicle here at the shop for two days after repair. We drove a total of 40 miles of stop and go. Had the truck sit outside running and see...	30
	1996 Chevrolet C1500 Suburban 5.7L MIL Lamp on, No closed loop opera VIN: 3GNEC16R0T Ok friends, the truck is fixed! Thanks to everyone who took the time to reply. I ended up checking the circuit wires between the B1S1 O2 connector & the PCM harness connector. It all Checked out. There was 12V at the O2 heater wire at the harnees terminal. Ru... Trouble codes: P0134, P0152 (O2 sensor circuit high voltage B2S1).	8
	2000 Chevrolet K3500 5.7L No Start, 6 Ignition Modules VIN: 1GBJK34R3Y I waited a couple of weeks to close this to see if truck had any more issues with the failing module. Most of the replies stated about bad or missing grounds and use of aftermarket parts. Ground voltage drop cold & hot was around .2v. What I wasn't told was th...	7
	2003 Chevrolet Impala 3.4L security VIN: 1G1WF55E73 Thank you very much for the assistance, the problem was two-fold. After I replaces the ign. switch and lock cyl., I did the re learn many times. The vehicle still wouldn't crank over, but now it would run jumping across the starter. Finding batt. voltage at te...	11
	1994 GMC Sonoma SL 4.3L wipers VIN: 1GTCS19W6R thank you all for your time as most of us suspected it was a ground problem. I found excessive voltage drop between front radiator support and eng/frame ground points (approx 3 volt) I suspect a harness or splice problem, but choose to run a new ground wire f...	6
	2000 GMC Jimmy SLT 4.3L misfire VIN: 1GKT13W1Y2 unfortunately i have not completed repairs yet, that will begin tomorrow morning... truck comes back running like something unholy has happened. my last remaining problem (#4 miss at idle) is gone and now air injection system is inop (vac line from switch cure...	16
	2003 GMC Envoy XL SLT 4.2L Poor Fuel Economy, MIL Lamp on VIN: 1GKET16S73 Sorry for the long delay to close this post. Wanted to make sure it was fixed for sure. Thanks for all the replys! Lots of great ideas! Like Robert [...] would've thought MAF sensor when this Envoy came in that is until I opened the hood and saw it didn't have one... Trouble codes: P0172 (Fuel Trim System Rich), P0495 (Cooling Fan Speed High).	18

(Also Available: All, Asian, Chrysler, European, Ford, GM.)