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Prev Professional Automotive Repair Technical Discussions for February 10, 2011
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Open Help Requests for GM
Help Request Answers
2001 Buick LeSabre Limited 3.8L Cuts out VIN: 1G4HR54K51
Hello to everyone I have one that is stumping us; It is a 2001 Buick LeSabre with a 3.8. It will sit and idle all day long. You can drive the car between a mile to 3 miles and it just turns off and code PO101 pops up every time .No other codes. It will start... Trouble codes: P0101
1969 Chevrolet Corvette 5.7L Retractable panel VIN: 194679S715
We got this vehicle after another shop worked on it. What I need is a schematic diagram for the vacuum that operates the retractible panel that covers the wiper arms. Also I need the vacuum schematic for the head lights. If you have them please fax the to 619-...
2001 Chevrolet Camaro 3.8L Eng /Trans VIN: 2G1FP22KX1
Vehicle came in with clanking noise when in drive or reversing doesn't do it all the time mostly when cold. Used stethiscope noise sounded like a cracked flywheel at rear of oil pan next to crank, no noise noticed at transmission housing near convertor. Remove...
2004 Chevrolet Silverado 1500 5.3L Misfire VIN: 2GTEK19T24
Hello to all!We have this truck put us in the corner here.Truck came in for miss firing on #1,#3,we replaced spark plugs,wire set still miss fire,smoke test intake syytem no leaks found, exhast back pressure test found no restriction.Pulled injector connector ... Trouble codes: P0300 (Miss fire)
2005 Chevrolet Uplander LT 3.5L abs VIN: 1GNDX33L85
Thanks in advance for any direction you can give. This Uplander will set a code C0040 and sometime a 41 for R/F WSS circuit and circuit range performance. We replaced the hub/sensor assembly a while back because it had runout. Code came back. When it occurs th...
2005 Chevrolet Silverado 3500 6.6L RPM change VIN: 1GCJK33225
This vehicle was brought in to have a check up as the customer is a little gun shy about losing another engine. The only symptom the customer complained about was an intermittent spike in RPM once or twice a week only lasting for a split second. The APPS is be... Trouble codes: P0401 (EGR Flow Insufficient), P0404 (EGR Open Position Performance), P2127 (APPS 2 Circuit Low Voltage), P2138 (APPS 1 - 2 Correlation), P2140 (APPS 2 - 3 Correlation), P2563 (Turbo Boost Control Position Sensor Performance)
2007 Chevrolet WORKHORSE 4.8L Excessive Emissions, Hesitation, Surge, Stall, Misfire, MIL Lamp on VIN: 5B4HPD2V17
Hi everyone, this truck has been a thorn in my side for months. It came here for a flash from another shop because they are unable to flash. I flashed it in november for a bulletin related to u codes and reduced engine power/ check engine lamp. Truck would go ... Trouble codes: U0107 (Loss of communication to tac module)
2007 Chevrolet Impala LT 3.5L Temp Guage VIN: 1S15DKHJUE
Hey guys i need some help here with an 07 impala. Customer came in complaining of temp gauge not working. Has a p0128 code for thermostat. When clearing the code guage works again but will happen again in about 2 days. Please help if anyone has seen this befor...
2007 Chevrolet Silverado 3500 HD LT 6.6L fuel tank won't fill VIN: 1GCJK33627
no codes no drivability concerns. truck begins to shut gas pump off at 3/4 full. truck only has 1 tank. totally original with no aftermarket add-ons. have checked venting system. does tsb for evap apply to this truck--i'm not a deisel tech.
1988 GMC R2500 Suburban 5.7L Poor Idle Quality, Stall VIN: 1GKGV26K5J
This truck will not idle at all. Stalls and runs real ruff. We have check compression it is 175 all across. We have checked for intake leaks and egr leaks and none found. Plugs are black which seems to be from over fueling. Any help with this would be great th...
2003 GMC Sierra 2500 HD 6.6L No Start VIN: 1GDHK24193
2003 GMC K2500HD 6.6 duramax engine. Cut out on road, will not restart, towed into shop. Diagnosis using snap on Modis scanner found MAF G/sec above 2.2 with engine off key on. Removed air filter, Filter Minder showed solid red, removed filter attempted to st... Trouble codes: P0089, P0090, U1800
2006 GMC Sierra 3500 SLT 6.6L abs light VIN: 1GTJK33D96
hi guy, i have a real good one, this truck been coming into the shop for 3 to 4 year for this problem. will set one code in history a c0055 rear speed sensor,but if you drive 500 to 600 feet the light will go off and will not come back until temp go under 30 d...
2003 Hummer H2 6.0L Ride Control VIN: 5GRGN23U63
It is all in the repair history. We cannot reprogram the trim height and have tried multiple times We've made blocks to hold the correct height. The system will not reset the ride height. Any thoughts? Thanks to all, RKB.
1992 Pontiac Firebird 3.1L Excessive Emissions, Poor Idle Quality VIN: 1G2FS23T5N
Hello! Got a firebird here been a trouble maker! The vehicle failed emissions do to high HC readings, 550pph before and after repairs! What all been replaced so far is: fuel injectors,intake manifold gaskets,O2 sensor,Coolent sensor,map sensor,Fuel pump with f... Trouble codes: 45 (Rich Exhaust)
1998 Pontiac Sunfire SE 2.2L Security System VIN: 1G2JB5246W
looking for some answers or some guidence on where to look now. we have check continuity in white wire through column and all is good. we have replaced instrument cluster with a used unit and have had no luck. This vehicle has had an air bag deployed on passen...

Fixes & Summaries for GM
Fix/Summary Answers
2002 Chevrolet Silverado 2500 HD LT 6.6L Excessive Emissions, MIL Lamp on VIN: 1GCHK23182
Thanks for everyones help. Just to answer a few. There was not gas in the fuel. The 200000 mile warranty has a time limit. Although we have seen balance tests alot worse we went for injectors because everything else checked out. Runs like new. Sadly the inject... Trouble codes: P1093 (Fuel rail pressure out of range).
2002 Chevrolet Cavalier 2.2L monitors VIN: 3G1JC52452
The car does go into closed loop operation, ect sensor is working, tried new o2 sensors, been driving the car for many miles, but still the same results. Looks like it is an ecm problem especially since fuel system and comprehensive component monitor are alway...
2004 Chevrolet Silverado 1500 LS 4.8L Volt Meter Other Gauges VIN: 1GCEC19V94
I did find them on ebay thanks for your imformation it was a big help
2006 Chevrolet Silverado 2500 HD LT 6.6L Voltmeter VIN: 1GCHK232X6
So far this one is a big fail. We had the truck in the shop for a week and it started and ran properly every time inside the shop or out in the cold. The customer took the truck and it ran fine for 2 weeks. One morning the batteries were dead and he had to put...
2008 GMC Acadia SLT 3.6L instrument cluster VIN: 1GKEV33758
Installer came back today and said he grounded a wire that shouldn't be we'll see what happens thanks too all that replied
2000 Pontiac Grand Prix GTP 3.8L Stall VIN: 1G2WR1215Y
Turns out the fuel pump resistor was bad, again. I found a GM TSB to relocate the resistor, (which is mounted under the R.F. fender from the factory) to the inside of the engine compartment, above and rear of the battery which protects it better from moisture...
2001 Saturn L300 3.0L No Start VIN: 1G8JW52R71
Ok this one is fixed. As alot of you suggested it was in the timing. On this engine you have to make sure the marks on the outside of the cam gear line up but they have to be in the correct pin hole to do so. Kinda felt a little stupid after i found the proble...
2004 Saturn Vue 3.5L turn signals VIN: 5GZCZ53474
Got Vue back to replace the hazard flasher/module. If you all remember the wiring diagram from Alldata appeared not to have a diagram with the turn signal switch. Thanks to Ernest he helped pointed out that Alldata mislabeled the turn signal switch. When I wen...
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