GM Automotive Technicians Technical Discussion and Fixes for Feb 14, 2012 - iATN (Members Only)

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Open Help Requests for GM

	Help Request	Answers
	1986 Buick Skylark Custom 2.5L Instruments VIN: 1G4NJ69U8G This car has an LCD instrument cluster. It works fine but when you turn on the lights. (either parking or headlights) The display goes blank. We took the headlight switch out and took it apart. We cleaned the contacts and put it back in but it didn't help. We ...	View
	1992 Cadillac Eldorado 4.9L SErvivis engine soon light VIN: 1G6EL13B6N Codes I033 I034 I037 I039 are displayed when retrieved from instrument cluster. Do these codes cause light to come ON? Scanner looses communication with the car. Service Soon Light stays ON . Scanner displayed code 62 at one time . Does this code cause light t...	View
	2002 Cadillac Escalade 6.0L abs VIN: 3GYEK63N62 Stabilitrac light coming on, code C0286 in memory. Mitchell indicates MPA switch problem for accumulator, Scanner says code is amber light shorted to battery. Noe PID on my scanner giving me charged or uncharged accumulator assuming im even in the right area. ...	View
	1997 Chevrolet C3500 Cheyenne 6.5L Trans WOT shifts VIN: 1GCHC39F5V Please help, help help. A problem child that has had multiple issues before this particular one! This truck had a 6.5T with an electronically controlled injection pump. Engine had a cracked block so the engine was replaced. Since the truck had a problem quitti...	View
	1999 Chevrolet Astro 4.3L MIL Lamp on VIN: 1GCDM19W1X scanned found p0143 b1s3 volt low and tech2 scanner reads 0-4mv pink and black wire for heater will light a headlamp bulb bright. overlay ppl/wht and tan/wht wires from sensor to pcm now read 451mv like an open ckt both sig hi andlo wires will light a bulb one...	View
	2002 Chevrolet Silverado 3500 6.6L Excessive Emissions, Poor Idle Quality, Misfire VIN: 1GCJK33172 This Duramax misses and smokes all the time. GM dealership replaced right side injectors. Has no engine codes. Smoke is definatly fuel related. Fuel actual and desired are good. have high return rates #5 12.0 and all others are at 7.0 exept for #4 which is at ...	View
	2003 Chevrolet Silverado 1500 4.8L Passenger Position Sensor VIN: 2GCEK19V13 Like I said previously, I replaced the SDM and it didn't fix the problem. I have Checked continuity between both Seat Position Sensor, Seatbelt Switch And Seat Harness. All checked out good. Even jumped the wires leading to the (Hall effect) Seat position Sens...	View
	2006 Chevrolet C5500 Kodiak C5C042 6.6L fuel VIN: 1GDE5C3266 vechile has a stored code of p0087 check for high vacuum on fuel filter found it to be with in specs command fuel regulator to 180 mpa and found the max acutaul will go to is 120 to 135 mpa talking to another tech he suggested to change the over flow value in ...	View
	2003 GMC Sonoma SL 4.3L ABS light on VIN: 1GTCS19X03 we have a hard code co222 (rear) front wheel speed sensor fault. i do have a gm service manuel on the computer but it dont talk alot about this code. i am lost. is it the speed sensor on the trans that also is the one for the computer and cluster? or is it ano...	View
	2003 GMC Sierra 2500 HD SLE 6.6L steering VIN: 1GTHK23103 truck came in with complaint of easy to steer left but won't turn right. You have to practically force the steering wheel to turn right and it seems to catch and release while turning. Same condition with wheels off the ground. You can hear the power steering ...	View
	2004 GMC Sierra 2500 SLE 6.0L Poor Idle Quality, Misfire VIN: 1GTHC24U54 Truck has rough idle and LTFT -12 both banks .Also has lack of power. Sometimes fuel trims will go back to normal at about -4 LTFT Drop exhaust to check for plugged cat. ok. Went for another test drive and LTFT is now +15 on both banks. MAF sensor was replaced... Trouble codes: P0101 (MAF performance), P0172 (Bank 1 rich), P0175 (Bank 2 rich)	View

Fixes & Summaries for GM

	Fix/Summary	Answers
	1991 Buick Regal Custom 3.8L Battery draw VIN: 2G4WB54L7M After tracing all connections and grounds and confirming my door switches and seat belt retracters were not the problems, I installed a new headlamp switch. The vehicle sat in my yard for a week two different times and was started up perfectly. Luckily this is...	18
	2001 Chevrolet Blazer LS 4.3L MIL Lamp on VIN: 1GNDT13W41 Hello Group: I must say I had a great response. 22 replies and all had great suggestions. You know how you finaly fix the vehicle and then the customer tells you "oh yeah I forgot about that". Well the new injector assembly was new but 1 year ago. I found som... Trouble codes: P0171.	22
	2003 Chevrolet Tracker 2.0L Engine VIN: 2CNBJ13C23 This vehicle was a bit of a pain but after going back through the mounts and checking the keyway on the crank I decied to trya swag and replace the balancer any way and it greatly reduced the vibration at idle Thanks guys for all the advise	9
	2004 Chevrolet Silverado 1500 5.3L MIL Lamp on VIN: 1GCEK19T74 First, thanks for your help. And a correction, the code for the rear speed sensor circuit, is C0237. I had the numbers transposed. The problems all seemed to be cured by adding an additional ground wire from the PCM to the engine ground. It had initially been ... Trouble codes: P0342, C0327 (Erratic rear speed sensor).	8
	2006 Chevrolet Uplander LT 3.5L Power Sliding Door VIN: 1GNDV33L06 After the door motor was installed, the door didn't work and I had no way of getting access into the power door module to read codes and my dealers were all backed up. After some hunting online I found someone that said if there were any codes in the power doo...	4
	2008 Chevrolet Silverado 1500 WT 4.3L Tcc Solenoid VIN: 1GCEC14X98 so everyone knows the power circut pink 2139 is powered through the run/crank relay and the ign switch cannot be an issue due to bcm powering run/crank relay.i seen this once before -the trans /engine harness runs along a double L-brackett just left of the dis...	7
	2003 GMC Yukon XL 1500 Denali 6.0L Suspension VIN: 1GKFK66U13 Thank you all for your input and information. I ended up installing a used compressor and two rear shock.. everything is working go so far Thanks again	13
	2007 GMC Acadia SLT 3.6L Passenger door and Heated seat VIN: 1GKEV33757 Cleaned ground connecting to the body also disconnected and reconnected all wiring harness going to the door and in the door. After that eveything has been working.	7
	2004 Saturn Vue 2.2L Engine VIN: 5GZCZ23D94 Great advice guys,what I did was replace the engine with a used engine and marked it up $200.00 like Lewis said and gave them credit for the old bill. The customer came in and apologized for getting testy (which I keep my cool)and all is good in mudsville. Als...	24

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