GM Automotive Technicians Technical Discussion and Fixes for Jan 17, 2013 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	2004 Buick Century Custom 3.1L Steering VIN: 2G4WS52J54 Has a hiss noise comming from the press. Hose. Harder to turn left than the right. Power steering flued has some flakes in it. Did not have noise before replasing the steering rack. Any one can help dont know what the next step is	View
	2005 Cadillac CTS 3.6L camshafts VIN: 1G6DP56745 I am replacing the timing chains on a 05 cts and the repair directions are not clear. The sprockets do not line up with the white links on the chains and all 4 cam flats dont line up at the same time. I have turned the engine over 40 or 50 times to ling up the...	View
	1989 Chevrolet C1500 Cheyenne 5.7L Excessive Emissions VIN: 1GCDC14KXK hi all, got this truck here that gross pollutes nox, egr system works when testing it by jumping a-b key on egr soleniod operates as designed, vac pump at tbody side valve opens remove jumper valve closes,power on pink wire ground signal on gray wire when a-b ...	View
	1997 Chevrolet Corvette 5.7L tire pres. mot. VIN: 1G1YY22G0V can tire pres moniter system be un hook or turn off no senser in tires	View
	1999 Chevrolet Lumina 3.1L No Start VIN: 2G1WL52MXX Hey folks, maybe I have a Florida car. Vehicle will not start when temps drop below 30 F. Engine cranks good, has fuel pressure and SPARK at plugs. The coolant temp and air charge temps are within outdoor temps after sitting all night outside. I can't get at t...	View
	2001 Chevrolet Malibu 3.1L No Start VIN: 1G1ND52J01 When you look at BCM data security data looks normal.Pass-Lock sensor PID shows that data to be valid.This code looks to me like a code you should see when either the PCM,BCM,or the Pass-Lock sensor has been replaced and the system is actually in learn mode. B... Trouble codes: B3031 (Security system in learn mode)	View
	2002 Chevrolet Suburban 1500 LS 5.3L Mode Actuator VIN: 3GNEC16Z52 The customer came in stating that the a/c only blowing through defrost after vehicle was inspected. Could not see the connection, Pulled mode actuator, inspected flap, moves freely. Replaced & re-calibrated actuator, now the air blows out the vents when the mo...	View
	2006 Chevrolet Silverado 2500 HD LT 6.6L glow plug VIN: 1GCHK23D36 Customer came in 4 months ago with code po706 bad ground number six glow plug. I replaced the glow plug, cleaned off the wiring and replaced the wire end. It now comes back with the same code...what is issue with number 6 here. I have heard 6 is an issue and d...	View
	2006 Chevrolet Silverado 2500 HD LT 6.0L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GCHK29U56 This is a landscapers truck, it tows heavy loads and gets driven VERY hard. Vehicle came in with #3 plug spit out, threads in head destroyed and plug almost melted looking. Removed cylinder head, resurfaced, installed thread insert and 2 upstream denso o2's. T...	View
	2007 Chevrolet Malibu LT 3.5L Cuts out, Stall VIN: 1G1ZT58N67 Please help with our nightmare phantom problem. About 6-months ago this 2007 Malibu, 3.5,83,[...], was brought to our facility with a gas gauge not working. We went through the diagnosis, confirmed that the dash unit was o.k., and found a defective fuel tan...	View
	2007 Chevrolet Express 3500 6.0L Oil Pressure VIN: 1GCHG35U77 Have a strange one here. This vehicle is well maintained and we have always used AC Delco filters with Castrol 5W30 oil. It is also a carpet cleaning van, so it does see periods of extended high idle (1200-1500 RPM) for the power take-off that has been added f...	View
	1998 GMC K2500 Sierra SL 7.4L Poor Idle Quality, Misfire VIN: 1GTGK29J3W Hello all, this is my week for issues. :( This truck came in customering stating it is backfiring. I road test the truck feels like a missfire. Put scanner on no codes no history. Missfire counters show #2 dead miss. Pull wires confirm it is #2 missing. Lookin...	View
	2004 GMC Canyon SLE 3.5L coolant gauge VIN: 1GTDT19614 Hello Techs. Have a problem with the coolant gauge in this truck not working correctly. It will only move a little bit. I checked for codes in the ecm and the ipc. No codes in either ones. I'm getting a good coolant sensor reading on the ecm and the ipc. I hav...	View
	2001 Pontiac Grand Prix GT 3.8L Readiness Monitors VIN: 1G2WP52KX1 Hello to all and thanks in advance. Have an issue with a car that wont complete its catalyst or evap monitors. Wondering if my P1811 code (even though seemingly unrelated) could be preventing these monitors from running or am I needing to look elsewhere. I jus... Trouble codes: P1811 (Max Adapt and Long Shift)	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1992 Buick Park Avenue 3.8L Stall VIN: 1G4CW53L3N I WANT TO FIRST OF AL [...] THE OTHER INPUTS IATN! Trouble codes: 41 (no cam reference signal), 34 (mass air flow sensor failure).	26
	2001 Chevrolet S10 4.3L Mechanical VIN: 1GCCT19W51 Truck is fixed parts to swap are intake upper and lower (egr VS no EGR) Left manifold dipstick and that was it pretty simple. Motor I got was a different VIN code and was from a 2002 Astro	12
	2001 Chevrolet Suburban 1500 LS 5.3L Communication VIN: 1GNEC16T51 Thanks to all for your help. We have found the problem, luckily. We went to test the prong on the pcm, 58, for the class 2 data line from that wire to the dlc. When we pulled the connector for the pcm this time, we noticed that on prong 58 and a few terminals ...	10
	2004 Chevrolet Silverado 3500 LS 6.6L Excessive Emissions, Low power VIN: 1GBJK34284 Well,we are closing this request without a fix.We have checked air pipes & intercooler for air leaks & no problem found.Tested wiring at maf & everything tested (ok).Have afew more things to check but we are at our time limit so will try to update when I get i... Trouble codes: P0101 (MAF Circuit Out of Range).	6
	1999 Pontiac Firebird Formula 5.7L Starting VIN: 2G2FV22G7X men forgot that the vehicle had another fuse box on the left side of the dash. found the gauge fuse blown. replaced and started and ran perfect.	9
	2004 Saturn Ion-2 2.2L Shifter VIN: 1G8AZ52F44 Thanks for all the help on this. All the info was great and very help full. The problem is in the trans on this one. this car has 199k on it and the trans is worn out. Thanks for all the help	6

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