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Prev Professional Automotive Repair Technical Discussions for February 27, 2009
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Open Help Requests for GM
Help Request Answers
1998 Buick Park Avenue 3.8L bcm VIN: 1G4CW52K2X
I have this 1998 Park Avenue that has a very intermittent no start or dying conditions. Everytime I get it at my shop it starts fine. Pcm has no history codes BCM has codes U1096, U1152, B1982, B1983. Hvac has codes B1652 and B1983, air bag has U1040, U1096 B1...
2000 Buick LeSabre Custom 3.8L No Start
Vehicle came in for a no start. Customer stated engine cranked slowly,tested battery and replaced. Vehicle started up as if it were flooded but cleared up and ran fine. Customer also wanted plugs replaced, so we replced plugs, serviced injectors and throttle b...
2001 Buick Park Avenue Ultra 3.8L headlights VIN: 1G4CU54121
headlights will come on intermitently with car off stay on for 20 seconds and go off battery dead in am thanks
2000 Chevrolet Corvette 5.7L MIL Lamp on VIN: 1G1YY22G3Y
wehilce has modified headers and exaust, k&n intake and some kind of chip in between harness and pcm. Originaly came in with same codes plus pending cat efficency codes. needed to go thru deq. installed new cats and removed chip. finally got monitors to pass... Trouble codes: P0141, P0161
2000 Chevrolet Silverado 1500 5.3L fuel gauge/ battery light on VIN: 1GCEK19T3Y
Customer brought vehicle in and said the fuel gauge went to empty, low fuel light went on, battery displayed on message center, check gauges light went on, then the security light went on and stayed on till the vehicle was shut off and was restarted. Vehicle s...
2001 Chevrolet Venture LS 3.4L radiator fans VIN: 1GNDX03EX1
rad cooling fans not operating, van was brought in leaking from by pass hose, replaced and was waiting for fan operation and never happen, overheated. can operate low fan with scan tool but will not get high speed, check all relay no problem, found i have 3, p...
2001 Chevrolet Impala LS 3.8L Security light on VIN: 2G1WH55K11
Good morning, I had a customer return with the security light coming on (twice in 2 days). The code stored in the BCM history is B2960. We replaced the ignition cylinder and Passlock sensor recently for a no start condition that would often leave them strande... Trouble codes: B2960 (Security data wrong but valid)
2004 Chevrolet Silverado 3500 6.0L reduced engine power VIN: 1GBJC34U54
The vehicle is flashing a Reduced Engine Power statement on the instrument panel. When it does this the power is low, but it only does this intermittently. I checked for codes and found a U0107A code,but with our wonderful MitchellOn demand5 website I can not ... Trouble codes: U107
2004 Chevrolet Silverado 1500 5.3L Excessive Emissions, Poor Idle Quality, Misfire, Poor Fuel Economy, MIL Lamp on VIN: 1GCEK19T84
have put in many o2 sensers in this truck to fix single bank missfires, seems to favor killing the left bank, 3 rights to 5 lefts. have tried napa and dealer sensors both with repeat failers on this truck. first one we put left bank with the bank 2 failing a f... Trouble codes: P0300
2004 Chevrolet Suburban 1500 LS 5.3L transmission VIN: 3GNFK16Z44
Vehicle shifts through gears in drive and reverse until vehicle warms up or is run for a few minutes, at this point all forward or reverse movement is lost and engine freewheels. If engine is shut off and allowed to sit for 5 minutes or longer vehicle will mov...
2005 Chevrolet Express 3500 6.0L no gears VIN: 1GBJG31U75
Truck came in on tow truck , has no gears in trans. Checked fulid level and it looks good and dosent smell burnt.Hooked up scanner and check to see if computer sees it going into gears,and it does. check codes has a P1810 but dosent get into detail what its al...
1994 GMC C1500 Sierra SL 5.0L lock up, early shift VIN: 1GTDC14H1R
this truck shifts very early, right in and out of lock up as low as 30kph. speed reading on scanner is eratic jumping from actual speed (35) to 90mph and back. speedo indicates proper speed and doesn't jump. Tried used speed buffer but no change. disconnected ...
2004 GMC Yukon Denali XL 6.0L left speakers VIN: 1GKFK66U84
This came to me from anther tech in the shop. I was asked to scope speaker output from left speakers at amp by boss and it was cutting out (signal was dropping to a flat line). They ordered a new amp and it needed programed and now its my baby. new amp did not...
2006 GMC Sierra 2500 HD SLT 6.0L Excessive oil consumption VIN: 1GTHK29U36
This truck has lost oil psi cold only and psi will fall if throttled on but seems fine when engine is warm.It also is using about 1qt. every 1000 miles it all started at same time
2001 Oldsmobile Alero GL 3.4L lifters VIN: 1V2C3G456G
hey guys, ignore the vin. i dont have in on me. im putting new lifters in the alero tomorrow and i havent replaced hydraulic roller lifters before. i tried to find info on presoaking and adjusting preload but im more interested in what you guys think rather ...
1990 Pontiac Grand Am LE 2.5L Misfire, Back fire VIN: 1G2NE14U5L
This car only seems to act up when the ambiant temp is close to 80 or higher. Car will backfire on acceleration and seems to misfire on accel sometimes. Customer states problem started after getting fuel but fuel sampple looks and smells good. We decarboned en...
2000 Pontiac Bonneville SE 3.8L Poor Fuel Economy VIN: 1G2HX54K8Y
Customer brought this car in with the complaint that the fuel milage dropped from 30 mpg to 20 mpg. He changed plugs and cleaned the MAF sensor with no improvment. All the codes I found were history codes. No current codes. On my test drive long term and short... Trouble codes: P1602 (Loss of electronic brake traction control module serial data), P1626 (Vehicle theft deterrent fuel enable signal lost), P1811 (Maximum adapt and long shift)

Fixes & Summaries for GM
Fix/Summary Answers
1995 Buick LeSabre Custom 3.8L No Start VIN: 1G4HP52195
hi techs,well we all have this vihecle back on the road.well I most say that the balancer was a trobleing job to take of.I believe that this was the very first time it was coming off.I tryed almost all the post that was given to me.I gat a 3/4" air gun and boo...
2000 Cadillac Seville SLS 4.6L heat/ac VIN: 1G6K554Y9Y
This one is fixed, yeah... First of all thanks to all who took the time to read and respond. Lesson one learned: don't try to figure out why the system doesn't work properly when you have any codes still stored. This thing had a broken air inlet door and we w...
1997 Chevrolet K1500 Cheyenne 5.7L Cuts out, Stall, MIL Lamp on VIN: 1GCEK19R6V
First off I want to thank everyone who posted replies. The truck is fixed. What I found the crank senser wiring plug at the senser was very soft.Replaced the plug and with GM senser. Traced wiring back to the computer and found the yellow wire half cut into we... Trouble codes: 339 (crank senser intermittently), 341 (cam senser out of range).
1998 Chevrolet P30 STEP VAN 350CID No Start, Cuts out VIN: 1GDKP32RW3
turn out we were pulling to much voltage. we replace the wiring harnes from the pump to where it goes in to the main harnes by ecm . also replace fuel pump relay and wireing
2001 Chevrolet Prizm 1.8L park lights VIN: 1Y1SK52831
Thanks for the replies. Timothy [...] got this one right. There are 2 ground wires at the module, I cut them and ran my own ground wires off of the module. It works perfectly. The car is doing great now. Thanks for your help.
2002 Chevrolet Monte Carlo SS 3.8L Stall VIN: 2G1WX15K32
The car finally came back yesterday.I looked over all the basics again and when I pulled the hose on the fuel presure regulator this time, it was full of fuel. I replaced it and the car was fixed. It had to be the problem the whole time time. I checked it othe...
2006 Chevrolet Cobalt LS 2.2L instrument panel lights VIN: 1G1HK55F66
Thanks again for all the replies ,we took the vehicle to the dealer to get the BCM reprogramed and replaced photo sensor. Dash lights working fine, So thanks again for everyone who replied.
1994 GMC G1500 Vandura 4.3L 1-2 shift sol VIN: 1GTDG15ZXR
Good Friday to all. A special thanks to David from Australia, Kevin from MI, John from CA, Mark from CN, and Mike from KS. David had a very good test to try-thanks mate, I will use that one again. Most if not all brought up the solenoids as a common problem an...
1995 Oldsmobile Achieva S 2.3L cooling fan VIN: 1G3NL52T6T
after disassembly to get to the thermostat housing I found that the T-Stat had been removed previously Currently it is in progress with some extra work being done so I wanted to close this out and thank all of those who replied
1997 Oldsmobile Aurora 4.0L Extended crank time VIN: 1G3GR62CXV
Thanks to those who responded so quickly! The culprit was the fuel pressure regulator leaking back into the intake through the vacuum hose. Replacing the regulator has solved the problem. Several of you suggested it. Thanks again!
1995 Pontiac Bonneville SE 3.8L alternator VIN: 1G2HX52K6S
2004 Pontiac Grand Prix GT2 3.8L Hesitation, Surge, MIL Lamp on, Limp mode + trac con VIN: 2G2WS52294
Thanks to every one who replied!!! We ended up preforming a complete PCM Re-flash after replacing the throttle body assy, MAP and MAF sensors. Re-flash appears to have solve this problem. We found there were at least 3 program up-grades by GM to correct senso... Trouble codes: P0068, P0101, P1106.
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