GM Automotive Technicians Technical Discussion and Fixes for Jun 13, 2012 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	2002 Buick LeSabre Custom 3.8L 1-2, 2-3, 3-4 Shifts VIN: 1G4HP54K32 Need some guidance on this one. Vehicle has a hard shift into each gear under moderate acceleration. Data appears normal on scan tool. Checked the history files and do not see anything with this problem.	View
	1994 Cadillac DeVille Concours 4.6L Surge, MIL Lamp on VIN: 1G6KF52Y1R Check engine light comes on intermittently and vehicle surges and chugs. Light will then go out a short time later and vehicle will drive perfectly. Idles as if it has a misfire on one cylinder all the time. No current codes are ever listed. Only history codes... Trouble codes: P0083 (24X reference signal high), P0109 (PCM keep alive memory reset), P0052 (PCM keep alive memory reset)	View
	2004 Cadillac SRX 3.6L MIL Lamp on VIN: 1GYDE63704 Hey guys and gals, hope everyone is doing well and staying busy!! This vehicle came to a fellow tech by way of a mutual friend. The car had a check engine light and a rattle under 2500 RPM. The customer replaced the cam sensors, but when this didn't turn off ... Trouble codes: P0008 (Engine Position Systen Performance Bank 1), P0016 (Intake Camshaft Position Correlation Bank 1), P0017 (Exhaust Camshaft Position Correlation Bank 1)	View
	2005 Cadillac DeVille 4.6L filters VIN: 1G6KD57Y35 looking for the location of the seatback filters. i found the seat cushion filters but cant locate seatback filters for replacement. alldata does not have it in database. thank you	View
	2007 Cadillac DTS 4.6L map lights VIN: 1G6KD57Y47 we relapced the body control module for many inoperative systems. one of the customers main complaints, is the map ligts in the overhead console and the rear passenger maps are not operational. the maps (are are controlled by the bcm as well),after programing ...	View
	1988 Chevrolet C1500 Cheyenne 5.7L Fuel Injectors VIN: 2GCDC14KXJ COMPLAINT: This truck came in with a driveability issue. Customer stated that it would run fine for awhile and then cut out and even died a couple of times. FINDINGS: After our test drive, in which the truck did cut out once, we scanned for codes and found a ...	View
	1992 Chevrolet K1500 Cheyenne 5.7L tramsmission VIN: 1GCEK14K4N truck is actually a 1998 but i diddn't have the vin for this vehicule but averything else is the same, 4x4, transmission came in leaking found leaking from little vent hose that comes back and goes off the sidde of the transmission, was wondering what causes t...	View
	2001 Chevrolet Tracker LT 2.5L Cuts out VIN: 2CNBE63431 Hello again! I have this Tracker here, and it need a mass air sensor. My question is does anybody know if there is any other way to obtain one without going to the dealer? Dealer unit is over a thousand $$, and this poor lady just can't afford that. I have rea...	View
	2003 Chevrolet Silverado 2500 HD 6.6L No Start VIN: 1GCHK23123 truck came in two months ago with crank no start,batteries were low and turned over very slow. charged batteries and truck started,had isterment cluster codes various u codes glow plug codes and p0370 high resolution circuit malfunction and p1550 fuel injector... Trouble codes: P0370, P1550	View
	2005 Chevrolet Tahoe LS 5.3L Shifting VIN: 1GNEK13Z85 Fellow techs, I have a ex- game warden Tahoe in the shop that will not up shift under any load, fluid was pretty bad so we flushed the trans and problem still exists. It will shift on its own when its run on the lift however while driving it will not up shift ...	View
	2004 GMC Envoy XUV SLT 4.2L Rear Gate Glass VIN: 1GKET12S14 I have this Envoy XUV that the rear gate glass will not go up with the switches. I have the "check manual- tailgat" message displayed on the dic. Here is what I know: All latches show closed on the scanner. The regulator is good, I can manually make it go up ...	View
	2001 Pontiac Grand Am SE 3.4L Ignition Fuse VIN: 1G2NF52E41 After car warms put in drive try to take off blows 40 amp mega fuse for ignition-never dies in park. Have checked system for shorted wire nothing found-checked bottom of fuse box nothing found dont know where else to look any ideas	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1996 Buick Riviera 3.8L Brake pedal VIN: 1G4GD2218T Again, wow on the amount of replies. Yes master cylinder replacement got the brakes back to normal. Just make sure you bench bleed the master good first. Thanks to all take care. Brake pressure tester? People actually use that in the flat rate field? If ...	53
	1999 Buick Park Avenue 3.8L Circuit 1807 Thank you for all of the advise. Took a look at all suggestions. Tried another BCM. Tested and found high resistance in the vehicle theft module. Replaced the vehicle theft module. Still no communication. The only problem that exists is the air bag light is on...	9
	2004 Cadillac SRX 3.6L Starting VIN: 1GYEE63714 tried another computer and same thing got tired and had customer take to dealer but till this day dealer has not figured it out either makes me feel better but will update when i find out the fix	6
	2005 Chevrolet Trailblazer LS 4.2L head lights VIN: 1GNDT13S55 I won't to thank every one for helping me. the #46 relay was the reason. It seamed like everyone knew that but me.And the customer said thanks.Thanks & may God bless you always. Charles	18
	2005 Chevrolet Colorado Z85 2.8L starter VIN: 1GCCS14825 Main promblem tech error but not first or last. David from Missouri said it best working on grandpa's truck. Craig from Michigan made me think about what I was doing wrong. I was trying to diag. using cruise switch. Went back look farther up the clutch pedal f...	16
	2005 Chevrolet Silverado 2500 HD 6.6L Cooling Systems Iput the pressure tester on it and it built up about 22 pounds of pressure in less then 5 mins looks the heads or coming off this will be the frist set of these ive done any help on the removal is welcome	18
	2000 GMC C3500 Sierra SL 7.4L Electronic VIN: 1GTHC33J9Y thank you all who took time to offer help. the fix was indeed the pcm replacement. the internal fault detection ckt had failed causing a "false" dtc to set. the falling out of gear in 4th hot was sent back to the trans shop for warranty. suspect a loss of...	6
	2006 Pontiac G6 GTP 3.9L Surge VIN: 1G2ZM55146 Got vehicle back in, went over all scan data and basics again, only thing found was the actual camshaft position vs. the commanded position weren't the same, actual was bouncing all over as vehicle was surging. Tested solenoid, resistance reading is very sligh...	9

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