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Prev Professional Automotive Repair Technical Discussions for February 15, 2012
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Open Help Requests for GM
Help Request Answers
2003 Buick LeSabre Custom 3.8L No Start, Cuts out, Stall VIN: 1G4HP54K83
Help!! Car towed in three times, initially with no fuel pressure so new pump module installed, now there is an intermittant start/immediate stall. Has left customer and tech stranded twice. Installed new ignition switch assy but now scratching my head. Replace...
2005 Buick Rainier CXL 4.2L Down shift VIN: 5GADT13S45
Good day everyone. I have this '05 Rainier with a whine type noise (sounds like a jet turbine winding down) that is intermitent. It's more pronounced once the vehicle is up to operating temperature. No related DTC's other than a TR code (P0705). I've also drop...
1996 Cadillac DeVille 4.6L blower motor VIN: 1G6KD52Y4T
have 96 deville with auto temp control and the problem is blower motor operation . the blower motor starts but immedately jerks back and forth ck the output from the a/c programmer and voltage flucuates between 1v all the way to 15v has any gm techs run across...
1995 Chevrolet Beretta Z26 3.1L Misfire VIN: 1G1LW15M5S
we got the car from a shop 100 miles away for a rough idle concern the car in missing on #2 and #3 all the time, there is spark to both cylinders and both have over 150 psi compression we even swapped injectors what am i missing here any help would be great, a...
1996 Chevrolet Cavalier 2.2L No Start, Stall VIN: 1G1JC124XT
Vehicle dies on customer and all I/P light are on, theft, oil check engine abs ets coolant lights on. will not restart for customer, we arrive and it restarts and we can drive for 3 days with it not dieing. Today while standing next to the vehicle while it was... Trouble codes: 1601 (loss of serial comm)
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...
2001 Chevrolet Silverado 3500 6.6L Converter seal VIN: 1GCJK33161
This vehicle came in with an oil leak, I could see through the inspection plug oil running right down from the converter seal area, and it was a steady stream while running, pulled tranny out and inspected, cannot find anything wrong, seal looks good and is no...
2002 Chevrolet Silverado 1500 4.3L MIL Lamp on VIN: 1GCEC14W72
Truck came in with random misfire code and #4 cylinder misfire code - history misfire counts of 20/#5 - 80/#1 - 3668/#4 - vehicle runs good and shows no signs of misfire - considering recent tune up, swapped ignition wires 2&4, plugs 4&6, distributor cap and r...
2003 Chevrolet Silverado 2500 6.0L cluster lights VIN: 1GCHK29UX3
instruments lights are blown, however all gauages work fine, is there a relay to look for. All fuses and wiring look good. Dealer is telling me whole assembly of instruement panel needs replacement, since light bulbs are intergrated and panel works with data o...
2004 Chevrolet Venture LS 3.4L Cuts out VIN: 1GNDU03E54
The customer complained that you have to ease it up to speed when accelerating. Road tested and vehicle will surge and cut out when under moderate to heavy acceleration or WOT. I.E. getting up to highway speed when turning onto highway in heavy traffic There a...
2006 Chevrolet Malibu LT 2.2L Cuts out, VIN: 1G1ZT51F86
Hey everyone, This vehicle has an intermittent problem that has only happened with the customer so my description may be pretty vague! The customer claims this vehicle at cruising speed will start to lose power. She says she can tell when its going to happen. ...
2006 Chevrolet Express 1500 4.3L flooding out VIN: 1GCFG15X36
hey guys looking for ideas to get at underlying problem of this van. Randomly this van will flood out. Have tuned it up new coil fuel pressure is 55 key off jumps up to 62 when first turn key on. Customer states that the van has never run better, but every mon... Trouble codes: P0172, P0175
2006 Chevrolet Cobalt LS 2.2L MIL Lamp on VIN: 1G1AK55F86
Vehilce came mil on scan found p0030 heater control ciruit,p0135 o2 heater circuit b1s1.perform test found heater circuit shorted in o2 sensor.service writer sold both b1s1 and b1s2 to customer.vehicle returned 2 days later mil on p0133 b1s1 slow response scan... Trouble codes: P0133 (O2 signal slow bank 1sensor1)
2007 Chevrolet Trailblazer LT 4.2L calipers VIN: 1GNDS13S47
vehicle came in with front calipers locking up. loosened bleeders, still locked,took hose off and still locked up. replaced both front calipers. one week later, vehicle back with front and rear calipers locking up. no abs codes or tractin control codes. once b...
1998 GMC Sonoma SLE 4.3L security light, battery light VIN: 1GTCS19W9W
security light and battery light stay on when truck is running. the vehicle is charging at 14 volts and there are no codes stored. the rpm gauge does not function correctly, it stahys at 900 rpm even while revving engine. if i hit the high beam switch the rpm ...
2002 GMC Sierra 1500 SL 5.3L Fuel Gauge VIN: 1GTEK14T02
Hello We have a battery draw, over night will have a dead battery. After shutting the vehicle off and pulling the key, approx. 15-20 seconds later the fuel gauge goes back up to 1/2 tank, and the temp gauge goes up half way. Put the key back in they drop back ...
2005 Hummer H2 6.0L ABS Light ON VIN: 5GRGN23U45
Vehicle Sets Code At Fwy Speeds 50mph+- Less Then 1 Miles Aprox 60 Seconds Never At Low Speeds Around Town, Every Time On Fwy. Have Checked Sensor Wiring Inspected Signiture Of Output, Its Good. There is 3-4 mph Diffrence Between Front and Rear Axles. Side To ...
2004 Pontiac Grand Am SE1 3.4L starter VIN: 1G2NF52E64
i Have this pontiac that has gave me a real run for my money. When you go to crank sometimes it will crank for a second then stop. I have 12 volts at computer for crank request from ignition switch. But the yellow wire to the starter relay from the computer on...

Fixes & Summaries for GM
Fix/Summary Answers
2006 Buick LaCrosse CX 3.8L Mechanical VIN: 2G4WC58216
we have checked for oil leaks and also checked intake gaskets did not find anything. talked to customer dosent want to look into at this time they will keep an eye on oil level.
2003 Chevrolet Trailblazer North Face 4.2L Poor Idle Quality, MIL Lamp on, Will not shift VIN: 1GNDT13S63
Okay. First of all I feel extremely foolish. It came to be that the bolts from underhood fusebox were loose. Tightened bolts all problems were solved. Trouble codes: P1512 (Min throttle pos not learned), P1682 (Ignition sw ckt fault).
2004 Chevrolet Silverado 1500 5.3L Differential VIN: 1GCEK19T44
2005 Chevrolet Aveo LS 1.6L MIL Lamp on, "hold" lamp VIN: KL1TD52665
Well another one down the road. This one was definately not a normal "check it and fix it"! The U0401 code is set according to GM "diagnostic info" because the data recieved by the ecm to the tcm is incorrect. Specifically: TCM detects incorrect throttle po... Trouble codes: P0300 (Random cylinder misfire), U0401 (Invalid data recieved from ecm).
2006 Chevrolet Equinox LS 3.4L Cuts out, Stall, MIL Lamp on VIN: 2CNDL23F06
well i finally got this vehicle to act up for me,and i checked data on snap shot.It ended up being the map sensor.Its sometimes hard to find when it wont act up for you and no codes set. Trouble codes: P0068.
2007 Chevrolet C4500 Kodiak C4C042 6.6L Engine oil/ DPF VIN: 1GDE4V19X7
On the one with the dpf clogging. We figured out the cat was not working.So we replaced the cat and I have been watching the aftertreatment data and it is working good four weeks after the repair.As for making oil on the other bus. It also had a clogging dpf s...
2003 GMC Sierra 2500 HD SLE 6.6L steering VIN: 1GTHK23103
Thanks to everyone. We suspected the steering gear and everyone agreed. I just wanted to be sure that there wasn't someting weird going on since it would turn one way. So with the customer's approval we'll be replacing the gearbox.
2002 Pontiac Firebird Formula 5.7L #8 Push rod VIN: 2G2FV22G62
Thanks for all the replies. We have determined that there is no direction other than the obvious. I explained to the customer that our next move would be to pull timing cover and look for an access to blow back through oil passages and if we came up empty ther...
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