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Prev Professional Automotive Repair Technical Discussions for June 20, 2013
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(Also Available: All, Asian, Chrysler, European, Ford, GM.)
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Open Help Requests for GM
Help Request Answers
1995 Buick Regal Custom 3.8L a/c clutch VIN: 2G4WB52L8S
Ok, so the customer brings his car in after installing his own compreesor & new orifice tube, the a/c will not run. We found .5 lb of refrigerant in system & fully charged to 2lbs, a/c still does not cycle. Scanned vehicle, found code p1531 (a/c low charge), c...
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2006 Buick LaCrosse CXS 3.6L all gauges VIN: 2G4WE58796
So the original owner puts 200000 trouble-free miles on this very nice Buick then gifts it to a college student. Within a week a new battery and cable end appear and all the gauges have stopped working: no speedo, gas, temp or tach. In addition the traction co...
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1998 Cadillac Eldorado ESC 4.6L Coolant VIN: 1G6EL12Y8W
Hello, This customer says the car will overheat when driving on the Highway. I have run it for an hour at the shop and test driven it 2 times on the highway for about 10 miles each with no overheating. The guage gets to about 1/2 and stays there. Any thoughts ...
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2006 Cadillac CTS 2.8L starting system VIN: 1G6DM57T16
This Cadillac original came in for a no-start and another tech in our shop found the ignition switch had burned out. He replaced the switch and away the customer went. Four days later, the same thing happened...a no-start condition. This time she took it to th...
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1967 Chevrolet Impala 5.3L don't know VIN: N0TAVA1LBL
Trying to help out a good customer with this old ride. After collapsing the four piston calipers and doing a standard brake job there is no pedal. We centered the combination valve and proceeded to bleed, but cannot get a pedal. We thought the brake lines may ...
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1997 Chevrolet K2500 Cheyenne 5.7L Brake pedal VIN: 1GCGK24R2V
Hey guys, truck came in with low pedal complaint. Replaced front calipers cause bleeders broke. Replaced module cause scan tool reads up to 22 mph from wheel speed sensors and starts over from zero to 22 mph even up to 60 mph, they never go above 22mph. New mo...
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1998 Chevrolet Camaro 3.8L Hesitation VIN: 2G1FP22K1W
Hello need help with this 96 Camaro 3.8 at first I thought it was just a bad crank sensor it coded for both knock sensors and the crank sensor . The check engine light was intermittent and bogging down . im thanking possible ICM It just seams odd both knock se... Trouble codes: P0327 (Knock sensor b-1 circuit low), P0332 (Knock sensor b-2 circuit low), P0336 (Crankshaft position sensor a circuit range/ performance), P1404 (Egr closed position performance)
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2007 Chevrolet Silverado 2500 HD Classic LS 6.6L No Start, Stall VIN: 1GCHK29D77
Vehicle brought in for stalling while idling. Once stalled, crank, no-start condition until fuel filter primed. Installed vacuum/pressure gauge at test port, primed to 10 psi and it quickly bleeds off. Primed again, than quickly clamped off both hoses from the...
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2009 Chevrolet C5500 Kodiak C5C042 6.6L MIL Lamp on VIN: 1GBE5V1999
I am hoping there's diesel tech out there who might have run into this. Bus came in mil light on,code p0154b. Tested main feed to intake air heater with cable disconnect from heater with Snap On AVR with pos connected to cable, neg to neg battery, amp clamp ar... Trouble codes: P154B
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2005 GMC Sierra 2500 HD SLE 6.6L Excessive Emissions, Surge, Misfire, Poor Fuel Economy, Black/white smoke VIN: 1GTHK23245
Thanks in advance for the help. Pulling my hair out on this one. we don't do a lot of diesel work here but enough. Mostly 6.0 Fords and Sprinter fleet work. This is my first real experience with a Duramax and its turning into a doozie. Truck is owned by a reti... Trouble codes: P0305 (Misfire), P0303, P0404, P0401 (EGR flow insufficent)
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2002 Oldsmobile Bravada 4.2L MIL Lamp on VIN: 1GHDT13S72
4.2 p1345 please help!!! been on this one for a couple weeks now any help would be greatly appreciated. To start from the beginning the vehicle was running very poorly with trouble code p1345. Customer replaced vct solenoid with no change in engine performance... Trouble codes: P1345 (Camshaft correlation)
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Fixes & Summaries for GM
Fix/Summary Answers
1984 Chevrolet Corvette 5.7L dash cluster VIN: 1G1AY078XE
Thanks to all, this one is out the door. As you recall we first attempted to install a salvage yard dash in this 84 Corvette. The cluster at least lit up and worked but after 5 seconds or so, the dash would dim down so it was about impossible to see in the day...
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1999 Chevrolet Tahoe LS 5.7L No Start VIN: 1GNEK13R7X
CHECKED IGNITION SWITCH OK. WITH HELP FROM IDENTIFIX TECH LINE TRIED MULTIPLE TEST SUCH AS TRYING TO START ON ALT FUEL SOURCE WOULD NOT START CHECKED MAP SENSOR EGR SYSTEM MASS AIR FLOW SENSOR NO LUCK. CHECKED FOR BAD VALVES JUMPED TIMING CHAIN. SWAPED CRANK S... Trouble codes: P1336.
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2005 Chevrolet Tahoe LS 5.3L battery VIN: 1GNEC13TX5
Thanks for all the replys guys; finally (after disconnecting BCM, onstar, checked seat switches, etc) the source of the Drain was the Driver's Door Module (DDM);suggested by Seth from NY and Timothy from Winsconsin. I opened it up and found the circuit board w...
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2006 Chevrolet Impala LS 3.5L Rotor VIN: 2G1WB58K36
Guys, you are great. It seems that there was something going on with ABS system. We bled it with a scanner, drove it bunch of times again and it seems fine now. Thank you all!
15
2007 Chevrolet Avalanche LTZ 5.3L No Blower at any speed using A/C or Heat VIN: 3GNEC12007
Got out the low amp clamp. Blower went as high as 23A on high speed. It stayed around 16A most of the time, but would drift above that from time to time and maxed out just over 23A. After a while of running at this high amperage the blower control module wo...
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2008 Chevrolet Equinox LT 3.4L Mechanical VIN: 2CNDL53F08
Ok people, here is a summary: Brake switch was not an issue, this design cannot put any pressure on the brake pedal. Brake pedal was not binding in any way when problem surfaced, so that wasn't the problem One way valve at the booster wasn't either, I tried...
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2009 Chevrolet Silverado 3500 HD LT 6.0L Unknown VIN: 1GCHK84K59
Well this is a first for me! I posted this truck and got 2 replies from the same gentleman thats it! Chris from Cali was helpful with a great discription of the bus communication. I am just very suprised that on a GM truck I didnt get more help. Good news is I...
2
2007 GMC Yukon SLT 5.3L Hard start VIN: 1GKFK13087
Some replies suggested a cam sensor or temp sensor problem. Scanner showed [...] engine hot and cam sensor scoped out OK. Others said possible fuel pressure reg. leaking and to pull vacuum hose to check. I would have already done this IF the vehicle had o...
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