GM Automotive Technicians Technical Discussion and Fixes for Feb 1, 2011 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	2004 Buick LeSabre Limited 3.8L Turn signals VIN: 1G4HP54KX4 Customer brought us this car after another shop replaced the left front headlight housing. Her complaint was that the left turn signals do not work at all. I followed what little diagnostic info AllData offers and replaced the turn signal switch since it seem...	View
	2005 Cadillac CTS 3.6L class 2 data VIN: 1G6DP56795 hi Cadi guys, thanks for looking this Cadi have u1300 in PCM , u1000 in other all modules, key stuk can not remove it out, no P R N D indecators. I do not know where to bigin, any reply will be great help.thanks.	View
	1997 Chevrolet Lumina 3.1L Excessive Emissions, Hesitation, Surge VIN: 2G1WL52M4V Vehicle was towed to our shop Monday afternoon. Customer stated it acted like it wasn't getting enough gas when accelerating. Confirmed this condition. When the engine is cold the engine will rev to around 3000 RPM's before it will start a large surge. As the ... Trouble codes: P0719 (Brk Sw. B circuit signal low/shorted)	View
	2001 Chevrolet Blazer LT 4.3L MIL Lamp on VIN: 1GNDT13W21 Ok , this truck is a PROBLEM. I have lean codes on both banks. the fuel trims climb instantly when reset (cold 18-20%) once in closed loop 18-20% til long term hit 10-15 then short goes to 2-5. I know this has to be a common component that effect both bank. so... Trouble codes: P0171, P0174	View
	2001 Chevrolet Monte Carlo SS 3.8L Misfire VIN: 2G1WX15K61 Hi folks, We have been asked by another shop to take a look at this for them, we too, are a little baffled. The engine misfires on # 6 cylinder at idle, misfire counter is showing constant misfires on 6. Counter stays at zero after abt 1500 RPMs. At idle, ki... Trouble codes: P0300	View
	2002 Chevrolet Silverado 2500 HD LT 6.6L Excessive Emissions, MIL Lamp on VIN: 1GCHK23182 We have a duramax with excessive smoke at an idle. The paramaters are all over the place. CMD(MS) CYL1 .23 2 .21 3 .53 4 .26 5 .32 6 .24 7 .38 8 .35 BAL RATE 1 -3.7 2 -2.7 3 +5.8 4 -2.1 5 +.9 6 -2.9 7 +1.6 8 +1.9 FUEL RATE 5mm MPA 36 DESIRED 36 FRP C... Trouble codes: P1093 (Fuel rail pressure out of range)	View
	2005 Chevrolet Trailblazer EXT LS 4.2L rear HVAC VIN: 1GNET16S65 OK here we go. The customer complains that the rear blower motor come on intermitently on its own, even when both switches are off. Also they complained about no heat to the rear but off course we have heat right now. This vehicle already has the auxillary wat...	View
	2006 GMC Sierra 2500 HD SLE 6.6L MIL Lamp on VIN: 1GTHK23D86 Hello All and thanks in advance, This vehicle is one of my regular customer's. Sevice lamp came on and I scanned the very next day. All glow plugs have failed. My concern is future failure of new glow plugs. I am wondering what steps I can take prior to rep... Trouble codes: P0671, P0672, P0673, P0674, P0675, P0676	View
	2010 GMC terrain 2.4L Daytime running lights VIN: 2CTF1JEWOA Hi, folks. I am curious if I can program the BCM on this USA vehicle for daytime running lights? I have an MDI and a current programming subscription. Apparently I need to call into GM and get an updated BCI number?? If anyone has done this I'd appreciate the ...	View
	1995 Oldsmobile 88 Royale LSS 3.8L No Start, MIL Lamp on VIN: 1G3HY521XS This vehicle was diagnosed as a no-start. I went to the customer's house to connect to the scanner and found out there was a no-communication problem with the scanner & vehicle. After I left customer stated vehicle started and ran o.k. She brought vehicle to m...	View
	2000 Pontiac Grand Am SE 2.4L ABS light on. VIN: 1C2NE12T2Y I'm back with another Pontiac, I don't know where they all come from! This one is definately the preverbial 'little old lady' car with 28,000 miles on it, and a crunched quarterpanel from a garage close encounter! Now to fixin it... it came in with ABS light o...	View
	2004 Saturn Vue 3.5L turn signals VIN: 5GZCZ53474 The problem was solved for two weeks. The vehicle is returning Feb. 3 for further troubleshooting. In my efforts to study the system I've found out that there's no clear wiring diagram in either Alldata or OD5. I hate dealing with Saturns. Nothing is simple or...	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	2006 Cadillac SRX 3.6L No Start VIN: 1GYEE637X6 Well folks, Ive been waiting for my customer to confirm the vehicle is fixed. They have filled three times now and all is good. We changed the vent and purge solenoids. There was no signs of either one stuck or fuel in the canister. I would have liked to have ...	8
	2001 Chevrolet Suburban 1500 5.3L No Start, Poor Idle Quality, MIL Lamp on VIN: 3GNEC16TX2 thank you for the replies, several noted faults with poor ground circuits at rear of cylinder heads both banks, and a few faults with poor terminal connections at throttle body. we did not get approval for any further inspection/diagnosis time to proceed with ... Trouble codes: P1518.	8
	2001 Chevrolet Impala 3.8L Cooling Systems VIN: 5456466544 lower intake manifold gaskets were completley destroyed.	40
	2002 Chevrolet Malibu 3.1L No Start, Stall, Horn honks after sta VIN: 1G1NE52J42 Well, thanks for the help everyone. The horn did not act up the next day when testing, vehicle started and ran fine from then on. Unable to duplicate any issues from that point on. Customer came and took the car and as of yet no call back to say it is acting u...	9
	2005 Chevrolet Suburban 1500 LT 5.3L Power Seat VIN: 1GNFK16Z25 Hello thanks for the replies after removing seat I found a melted pin at rear main connector, just as Warren stated. I ran new wire & system works great.	6
	2010 Chevrolet SILVERADO 5.3L Contorl Arm Bolts VIN: 3GGCRKE37A Thank you all for your replies. They were all helpful. I did come up with one other suggestion that would probably be a "for sure" fix. Use locking nuts on the bolts instead of the type that come on the vehicle. However, I am going to try red Loktite for now a...	11
	1997 Pontiac Grand Prix GT 3.8L key interlock VIN: 1G2WP12K8V Thanks for all the help. I was finally able to put together the schematic with the info from Eric and Chris, with both sheets together you get the whole thing. I was looking for the Steering Column Electric Park Lock solenoid, which is fed from the Brake Trans...	13
	2005 Pontiac G6 3.5L Suspension VIN: 1G27G52865 This one is solved guys, you nailed it. Sure enough, it was the inner sway bushings. Should've known from all the caravans I've done. I removed the lower bolts that are easily accessible and just pried the bands upward, leaving the other bolts still attached. ...	5

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