GM Automotive Technicians Technical Discussion and Fixes for Jan 19, 2012 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1988 Chevrolet C1500 Cheyenne 5.7L Excessive Emissions VIN: 1GCDC14K8J there it no grd signal to egr control valve and other related components at any time, off idle throttle, at hyway speed, in any gear.. other wise the truck runs fine nox is way too high dont know this system, can u point me in the right direction, i could even...	View
	2001 Chevrolet Malibu 3.1L engine VIN: 1G1ND52J81 Car came into the shop a no start on the hook. The security light is not on while cranking or Key on. Scanned the computer and found no codes in the pcm or bcm. I have about 55 psi of fuel while cranking. I have good spark from the coil towers and at the end o...	View
	2002 Chevrolet Silverado 2500 6.0L ABS system VIN: 1GCHK24U02 Greetings ABS guru's. My customer purchased this vehicle about 3 weeks ago and brought it in because the ABS and Brake warning lamps have been on since he got it. Scanned for codes and found service code C0237: Erratic rear wheel speed sensor output. I road te...	View
	2003 Chevrolet Tracker 2.0L Engine VIN: 2CNBJ13C23 Before I begin thanks for taking the time to read this. I've been working on this Tracker. The vehicle has a severe vibration at idle,not so bad in park but in drive at a stoplight it shakes pretty good. I've eliminated the intermitent missfire and the two bro...	View
	2005 Chevrolet Silverado 2500 HD 6.6L MIL Lamp on VIN: 1GCJK33135 Truck has no other symtoms besides MIL ON, codes are P0101 MASS performance and P0299 Turbo Underboost, ALready replaced MASS and Boost Sensor, Checked for air leaks, remove carbon form Admision, checked EGR valve, , verified NO exhaust restriction, replaced A... Trouble codes: P0101 (Mass Performance), P0299 (Turbo Under boost)	View
	2006 Chevrolet Uplander LT 3.5L Power Sliding Door VIN: 1GNDV33L06 This vehicle came into the shop with a r/s sliding door inop. The vehicle is a specialty vehicle with a handicap ramp that comes out after door is open. The door can be manually opened but the ramp won't come out if it is not opened in time. When started check...	View
	2008 Chevrolet Silverado 1500 WT 5.3L transmission VIN: 1GCEK190X8 customers complaint that at times and happening more now that when coming to a stop or slowing down sometimes in turns as well that speedo will drop to zero and then downshifts and rpm increases then will shift again and be fine for a while, trans fluid clean,...	View
	2010 Chevrolet Equinox LT 2.4L Engine VIN: 2CNFLEEW3A Thanks ahead of time, first time asking for help. Vehicle came into shop for intermittent dieseling, not dieseling stays running for 2-5 seconds after ignition key turned off. Check engine intermittently comes on and goes off. Has P0172 fuel system too rich ba...	View
	1994 GMC K2500 Suburban SLE 7.4L power steering VIN: 1GKGK26N6R Power steering pumps are going out on a regular basis. I have checked the whole system including the hydroboost unit for restrictions and everything is flowing good. I put a new pump on and it works great, has good pressure, no problems and then just goes with...	View
	1995 GMC G2500 Vandura 5.7L not shifting/lite VIN: 1GDEG25K8S no shift no speedo banged dash speedo work and go our no shift unpluged abs abs (light onsome times )shifted pluged abs beck in shifed again lost shifting unpluged abs agian no shifting speedo started working still no shift pcm on eng side mph 15 and 1 on tran...	View
	2005 GMC Envoy SLE 4.2L blower fan VIN: 1GKDT13S65 vehicle came from another shop ,, when key is in run position fan for hvac runs ,, when ignition is turned to start position and vehicle runs ,, blower fan stops working no codes on any modules and will not do it all the time ,, has anyone run into this ,, ...	View
	2008 GMC Savana 1500 5.3L No Start, MIL Lamp on VIN: 1GTFH15468 Thank you for looking.. I'm looking for more info on testing this van. Has no fuel pump power . Mitchel is a little odd when it comes to the relay. We tried grounding pin 16and powering pin 47,at FPCM. pump dident run.(from direct hit). Tried buypassing the re... Trouble codes: U0109 (loss of fuel control module)	View
	2001 Oldsmobile Aurora 4.0L Suspension VIN: 1G3GS64C61 This car has rear air shocks. customer heard a clunk in rear, found line rubbed thru for air shock so we replaced the shocks and line kit. in the morning when you take off, you hear a thump in the rear. the top of the shock sinks down, so until the system airs...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	2003 Buick Century Custom 3.1L starter VIN: 2G4WS52J33 well i went and took apart the steering column to che the wiring in the switch and found one of the white wire that was torn apart, so i just connected them back together and the car started right up.	14
	2001 Chevrolet Tahoe 5.3L Poor Idle Quality VIN: 1GNEC13TX1 Hi All Thanks for taking time. I recieved 23 replies. 99% said to clean the throttle body, that this vechicle did not have an iac valve.noting that I should not spray carb chocke cleaner directky into the throttle body but to use a rag sprayed with carb clean...	23
	2001 Chevrolet Corvette Z06 5.7L steering lock VIN: 1G1YY12S01 Thanks to all who took time to reply. The recall had been done on this car only the relay was in the passenger side footwell as opposed to by the steering column where they usually put it. Replaced the relay and all is well. Thanks again, Allen	5
	2002 Chevrolet Silverado 2500 6.0L Steering VIN: 1GCHK29U22 Thanks for all the replies. They were very helpful. I ended up putting a new pump/resevoir assembly on it and used a vacuum cap to pull the air out of the resevoir while the engine was running. It took a while to get all the air out but i believe it is fixed. ...	15
	2002 Chevrolet Silverado 2500 HD 6.6L engine performa VIN: 1GCHK23102 Thank everyone for your advice. We had recieved conflicting information on what was actually done to the vehicle before it came in to us. We ended up sending this vehicle to another shop that deals with diesels. Thank you again.	7
	2004 Chevrolet Silverado 2500 6.0L Transfer Case VIN: 1GCHK24U14 Well come to find out from customer that both rear universal joints were replaced a month or two ago and ever since then he has had this vibration. Customer brought rear driveshaft to get checked for balance isuue and the company did have to rebalance drivesh...	10
	2004 Chevrolet Trailblazer LS 4.2L timing VIN: 1GNDT13S14 This Trailblazer is out the door and running well. I was able to set the timing without removing the front cover. The most confusing part was the exhaust cam phaser/actuator. I removed the intake and valve cover. Rotated the engine to TDC #1 using my TDC...	5
	2006 Chevrolet Silverado 1500 LT 4.8L #1 Fan Relay VIN: 2GCEK13V46 Okay, I want to thank everyone who replied. What we found was even though the computer connectors look visually fine outwardly, we removed the blue covers that retain the female pins in place. what we found is that the #42 pin which is fan control had corroded...	12
	2008 Chevrolet Silverado 1500 WT 4.3L No Start VIN: 1GCEC14X28 I would like to thank all that replied to this request. Especially Jamie from Penn. His suspicions were the same as mine. Ordered a new ECM from the chevy dealer and after installation we had scan data and codes back from the ECM. We did have to return the ... Trouble codes: U0100 (Loss of com with pcm).	5
	2008 Chevrolet HHR LT Panel 2.2L steering effort VIN: 3GCCA05D28 I found that the torqe sensor and the steering angle sensor do get calibrated through the power steering control module with a tech2. I sent out for calibration but the torque sensor would not calibrate, it would kick the user back to the menu every time he tr...	14
	2008 Chevrolet Uplander LS 3.9L heater core VIN: 1GNDV23188 Thanks for all the replies. I ended up flushing the heater core and running all the air bubbles out I think that the air bubbles were the promblem	14
	2009 Chevrolet Aveo LT 1.6L Hesitation, Surge, Stall VIN: KL1TD56E69 Waiting for it to set a code and or act up more permanent for us to give us direction. I will tell you that a teenage girl is the primary driver and it is hard to get her to stop by and check. I will post a fix if and when we find it.	8
	1997 GMC Yukon SL 5.7L Cuts out VIN: 3GKEK18R2V Thank You all for the overwhelming responses. Everyone that suggested fuel pump was on the money but for a realy weird reason. Filter was clear. I bought a new gauge head for my tester and got more accurate results. Volume test was good. Light throttle pressur...	30
	2008 GMC Sierra 1500 WT 4.8L unable to fill fuel VIN: 1GTEC14C28 THANKS FOR ALL 10 REPLIES, CUSTOMER DECIDED NOT REPAIR, JUST PULL THE NOZZLE OUT A BIT AND TAKE HIS TIME. THANKS DANNY	10
	2003 Saturn Vue 2.2L No Start, MIL Lamp on VIN: 5GZCZ23DX3 The Vue is still not fixed but I did receive some usefull info and now I'm waiting to find an electronic t/body. I checked and cleaned the vss connector ontop of transmission and the 40 pin connector at the A pillar. Thanks for the phonecall w/ help from the... Trouble codes: P0107 (Map Baro Low), P1120 (Tps 1), P1220 (T P Sensor), P1681 (Driver 5 Line 1), P1635 (5v Ref Low), P1515 (Electronic throttle).	5

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