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Prev Professional Automotive Repair Technical Discussions for November 4, 2011
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Open Help Requests for GM
Help Request Answers
1999 Cadillac DeVille 4.6L Interior VIN: 1G6KD54Y3X
Every day this one is getting worse! First, car is not here for service, just for sale on commission. (Day 1) I get woke up at midnight by the Police saying the Cadillac down at my shop has the alarm going off and lights flashing. I go down to the shop and fin...
2004 Cadillac SRX 4.6L right side low beam VIN: 1GYDE63A14
Right side low beam not working. This has HID lights with module. Visual inspection of HID bulb shows bulb being burned out. Had students check for power and grounds at ballat of bulb, three terminals. All were good? Not true. We then check for power and groun...
1981 Chevrolet Corvette 5.7L check engine light
we have tried charging battery to full,disconecting the alternator,and computer check engine light not on with car running also tried replacing ignition switch on steering colume it also draind the battery if not disconnected
1986 Chevrolet Monte Carlo SS 5.0L Lighting VIN: 1G1GZ37G1G
thanks in advance.i have this car and the brake light is on looking at the wire diagrahm i have 12v on pink and black wire going to the at the switch all i have is ground on the tan and white wire at the park brake switch and brake preessure switch...
1998 Chevrolet Tracker 1.6L tcc solenoid VIN: 2CNBJ1361W
No 12 volt output from computer sometimes . I replaced computer with used , same results . some days , system works fine and then when problem occurs , I get no signal from computer . I erase code and it shifts 1-2 no prob 2-3 no prob 3-4 no prob. I can activa...
2003 Chevrolet Tahoe LS 5.3L Unknown VIN: 1GNEK13T73
Need some assistance from you GM techs. This tahoe came in with a complaint of a noise in 4wd. Very easy to duplicate on the road but very hard to duplicate on lift. The noise is like a grinding rumbling noise much worse when braking than when accelerating. Te...
2003 Chevrolet Express 3500 6.0L Alternator VIN: 1GCHG35U83
Hello all, ive got a express van killing me.Van brought in complaint of stalling dim lights etc.Checked the alternator at the battery only charging 12.4 volts.Replaced alternator with new and still have the exact same problem.I have 12 volts to the large red w...
2006 Chevrolet Tahoe 5.3L bottom end? VIN: 1GNEK13Z06
We have a medium i guess slightly tin sounding noise in the bottom end of engine,favoring the front part of the oil pan.It is a police vehicle has had proper oil changes.Oil pressure is good by dash guage.I have not yet put a test guage in it.There no codes,no...
1998 GMC Savana 3500 6.5L No Start VIN: 1GDJG31F2W
This one came in on the hook. Both batteries completely dead. Customer states engine was left idling for hours and died. After replacing both batteries engine cranks good no start. Scan codes found P1631, Theft Deterrent Password Incorrect. We cleared code, th...

Fixes & Summaries for GM
Fix/Summary Answers
2001 Buick Century Custom 3.1L MIL Lamp on VIN: 1G4WE52J21
We fix it by installing new ftp sensor. Thanks for the help. Trouble codes: P0446 (Evap vent solenoid).
2012 Cadillac SRX Luxury 3.6L privacy VIN: 1AAAASDFGH
Everyone thank you for your replies, We did find that the on star control unit in this model is located behind the glove box, we elected to try the fuse in the center console fuse box marked on star first, that disabled the unit to make the customer happy. h...
2001 Chevrolet S10 4.3L Poor Idle Quality, Misfire, MIL Lamp on VIN: 1GCDT19W51
Thanks for all of the great replies. Of course it was one of those where you smack your head and say "should have known". The P0507 code turned out to be a prior shop adjusting the hard idle stop on the throttle body. Easy enough fix for that. The P0300 was in... Trouble codes: P0507 (Idle speed High), P0300 (Random Multiple misfire).
2003 Chevrolet Express 3500 6.0L Surge VIN: 1GBHG31U43
We isolated the problem to the left frame rail of the truck loosing ground when in drive with light throttle from a stop. The fuel pump is grounded to the rail. Running an auxiliary ground wire solved the surging. Voltage drop testing showed anywheres from ...
2004 Chevrolet Tahoe LT 5.3L Unknown VIN: 1GNEK13Z64
the customer did not want to go into pre surgery ,drop pan or other pressure tests.the customer decided to go ahead with the trans me it defenitely sounded internal but i did not get the opprotunity to tear apart the unit.after replacing the uni...
2005 Chevrolet Express 3500 LS 4.8L evap system VIN: 1GCHG35V95
We replaced the vent valve per the replies made that maybe valve was on the way out. we also replace the fuel pressure sensor as well. Good fleet account explained to them the issues we were having and they told us to go ahead with it all. test drove vehicle a...
2007 Chevrolet Impala LT 3.5L No Start, Poor Idle Quality, Hesitation, MIL Lamp on, Tachometer is inop. VIN: 2G1WT58KX7
After checking the wiring and terminals again we sent the vehicle to a GM garage. They spent 4 hours on the vehicle and opened a case with GM technical assistance. GM technical assistance told them it had to be an internal engine problem. Customer decided not ... Trouble codes: P0336 (Crankshaft Position CKP Sensor Performance).
2009 Chevrolet HHR LT 2.2L cooling system VIN: 3GNCA23B69
replaced water pump on the hunch it was a loose impeller, no improvement. determined (finally) that there is a very slight separation of the head gasket. waiting for approval and will update.
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