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Prev Professional Automotive Repair Technical Discussions for January 2, 2012
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Open Help Requests for GM
Help Request Answers
1991 Chevrolet Camaro RS 3.1L No Start, Cuts out, Stall VIN: 1G1FP23T4M
Hello all , vehicle came in with multiple driveability issues(idle rough , dies at road speeds & etc.)Found map sensor voltage not responding on scan tool so replaced map sensor & PCM. That issue is resolved but now it will start (sometimes)& will run OK for a...
1994 Chevrolet G20 Sportvan 4.3L Poor Idle Quality, VIN: 1GBEG25Z1R
Ok now again i want to thank everyone for there replies fro my last post on this Chevy.Now i,m down to the last problem here i hope I have no voltage ref. to my IAC .Have replaced pcm 2 times once again i,m very limited to the tools i have at hand to disg. thi...
2002 Chevrolet Impala LS 3.8L battery VIN: 2G1WH55K72
Short trip driver. Michigan winter. After a few weeks battery is starting to get weak. Charged battery and checked draw. Initially 1.6 amp draw. After a few minutes everything goes to sleep and draw drops to 18ma. Within a few seconds draw jumps up to 1.8 -1.9...
2005 Chevrolet Silverado 2500 HD 6.6L Excessive Emissions, Hesitation, MIL Lamp on VIN: 1GCHK23225
This vehicle is smoking(white/gray fuel smoke). Has no boost at idle or during acceleration.The maf reading is down around 17 at idle.Also has sporatic problems with EGR system performance but according to the position senser it is currently closed.I have swep... Trouble codes: P0101 (maf PERFORMANCE)
2007 Chevrolet Cobalt LS 2.2L No Start VIN: 1G1AK15F47
Someone please show me the light! It's so dark in this poor little Chevy. I'm a mobile ECM programmer and do diag for shops only. I was called in to program the PCM, I have flashed 150+- GM vehicles. When the programing was about 50% done I lost communication ... Trouble codes: U1016 (Lost communication with pcm/TCM)
2002 GMC Sierra 2500 HD SL 8.1L Poor Fuel Economy VIN: 1GTHK23G22
how does a 1/2 of a quart of fuel get into the oil over just 50 miles and not set a code or run any differant. Found the fuel trims to be normal. o2s are switching from lean to rich with out a problem. Coolant sensor is right. air temp is right. the egr is not...
2003 GMC Envoy XL SLE 4.2L Power steering hose VIN: 1GKET16S93
This is probably a simple question for someone, but has anyone replaced a P/S hose on one of these Envoys? According to MOD there is a special tool to remove the "inner" seal at the rack & pinion, J44586. It does not appear to be a very popular tool. Has anyon...
2004 GMC Yukon Denali 6.0L 2-3 shift VIN: 1GKEK63UX4
Vehicle while driving when it goes to enter 3rd gear shift it is actually going back to 1st and for 4th is goes back to second. Via Tech 2 it is being comanded properly but sets no codes for this problem. As it is comanded it shows 2-3 shift error to 43 second...
2005 Hummer H2 6.0L heated seats VIN: 5GRGN22UX5
This one got me stumped. If there is a driver, neither heated seat works. If someone sits in the passenger seat(doesn't matter if the driver is there) BOTH heated seats will work. As soon as the passenger gets up, they shut off. I'm thinking occupant sensor bu...
2002 Pontiac Aztek 3.4L awd VIN: 3G7DB03E52
I suspect rear axle actuator is faulty component causing this concern but the price tag has me a little gun shy. The customer had installed a used rear diff for noise and awd dissable displayed. He brought it to us with awd disable displayed and abs light on. ...
2006 Saturn Vue 2.2L Loss of drive VIN: 5GZCZ33D26
Customer states car was driving normally & out of the blue she lost all forward gears. REVERSE FUNCTIONS NORMALLY!! It has the 4T45-E Automatic Transaxle. (I do not believe this is the one that blows up all the time.) . No codes in any systems. Fluid level nor...

Fixes & Summaries for GM
Fix/Summary Answers
2004 Cadillac CTS 3.6L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1G6DM57754
Ordered new aftermarket ecm. Unable to flash ecm inhouse, sent to dealer. Dealer unable to communicate with ecm. Ordered another aftermarket ecm, same result. Ordered o.e. ecm. Dealer reflashed and car runs like new. Thanks for all of your replies. Trouble codes: P0201 (Cyl 1 Injector circuit porblem), P0300 (Cyl misfire detected), P0301 (Cyl 1 misfire detected), P0522 (Engine oil pressure sensor circuit signal low), P2008 (IMRC solenoid control circuit fault).
1994 Chevrolet G20 Sportvan 4.3L Poor Idle Quality, MIL Lamp on VIN: 1GBEG25Z1R
First and foremost thanks to all of you who replied .I know how busy all of you are there were several things going on with this van of cource the cts the egr valve and even had a stuck open therm.B utnow the only thing i,m not getting is my 5volt ref. to my I...
2003 Chevrolet Suburban 1500 5.3L cat & evap monitors
yes I checked repeatedly for pending codes-none, I tried refueling 2x, also partially blocked radiator air flow to raise engine temp even tried driving in 2nd and 3rd gear at higher RPM to bring temp over 210 deg. Still 2 monitors not ready - Cat & Evap Howev...
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