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International Automotive Technicians Network
Prev Professional Automotive Repair Technical Discussions for June 16, 2010
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Open Help Requests for GM
Help Request Answers
1999 Buick Park Avenue Ultra 3.8L security light VIN: 1G4CU5219X
We have a Buick Park Ave Ultra that has a security light on driving or just key in run. Also intermittently the first time you hit the key you get a no crank, but if you release the key and try again it will start. The pinpoint test for SECURITY LIGHT ALWAYS O...
1993 Cadillac DeVille 4.9L Security Indicator light VIN: 1G6CD53B6P
customer has returned with same battery issues along with the same security light symptoms the vehicle starts and drives with no other problems or MIL's as you park and turn off and remove the key the security light begins flashing immediatly get out of the ca...
1993 Cadillac DeVille 4.9L Starting VIN: 1G6CD53B8P
Can someone tell me which relay of the seven in the relay panel is the starter enable relay.The starter stays engaged after starting.Mitchel doesn't show it.I don't want to leave the srarter running while I pull relays trying to find the right one Jim
1999 Cadillac Seville STS 4.6L speedo, radio door locks and other misc accessorie VIN: 1G6KY5494X
this car is back with same problem in just a week? alternator seems to be ok. has anyone run into like problem? vehicle has northstar eng.
2009 Cadillac CTS 3.6L MIL Lamp on VIN: 1G6DV57V49
I replaced the timing chains on a 2009 Cadillac CTS with 96,000 miles. The car runs fine but I'm getting an active P2187 code for too lean at idle bank 1 and a pending P2189 code for too lean at idle bank 2. I didn't get these codes before the timing chains jo... Trouble codes: P2187 (Too lean at idle bank 1 current), P2189 (Too lean at idle bank 2 pending)
1995 Chevrolet G30 Chevy Van 5.7L Cuts out, Engine dies VIN: 1GCGG35K7S
Sorry fellas this is a friends of a friends van. Engine quits when shifting from park to reverse or drive after engine has warmed up. Found codes for map sensor and iac. Cleared codes and iac comes back after engine warm-up run idle control test with scan tool... Trouble codes: 33 (Map sensor), 35 (Iac malfunction)
2002 Chevrolet Silverado 2500 HD 6.6L No Start VIN: 1GCHK23182
Hi Duramax Techs. The truck was towed-in as a no-start. P0374 DTC. The timing waveform at the FICM is an irregular square wave. Checked the crank sensor waveform at the input of the ECM and it is the same, irregular. There is a good power and ground at the cra... Trouble codes: P0374 (Timing reference high resolution)
2004 Chevrolet Avalanche 1500 5.3L No communication VIN: 3GNEK12TX4
To all the gm techs i hope you can shed some light on this problem im having. Customer came in wanting to up date the pcm. Truck ran when it came in the shop. Before starting to do the up dates i used the tech 2 to check the state of health on the class 2 data... Trouble codes: U1000 (Class 2 data link malfunction)
2006 Chevrolet Silverado 2500 HD LS 6.0L Unknown VIN: 1GCHK29U46
Vehicle is equipped with a 4L80E transmission. We installed a transfer case recently for a broken case (approx 2-3 weeks before this issue; don't believe the transfer case repair is related to the issue we have now). Not too long thereafter the customer came b...
2007 Chevrolet Suburban 1500 LT 5.3L radio, dash lights VIN: 3GNFC16J87
Gentleman, Customer brought vehicle in with complaint that radio, and instrument display lights will not turn off when either front door is open. They can be manually turned off at respective switches. Hooked solus up and scanned, but no codes are present in...
2000 Geo Prizm 1.8L Hesitation, Stall VIN: 1Y1SK5285Y
This car has been getting worse over several months. It's hard to start especially cold. Throttle resposne is OK if you ease into it, but punch it 1\2 or more & it stalls or studders for a few seconds & then catches up. No codes, all sensors seem to be reposdi...
1998 GMC Yukon SLE 5.7L Fuel Guage VIN: 1GKEK13R6W
Got a 1998 Yukon that he fuel guage needle is bouncing rapidly when key is on. I have checked all body wiring to see if anything may be the culprit. I am lost with this one so any ideas would be greatly appriciated. Thanks for your help in advance.
1995 Oldsmobile 98 Regency Elite 3.8L Electronic VIN: 1G3CX52K1S
Transmission will kick out of 'overdrive' after about 3 miles of driving. After turning key off and re-starting , it will go back into 'overdrive' again for a short time it will not lock back up. Any idea's please?
1996 Oldsmobile Cutlass Supreme 3.1L KS sensor VIN: 1G3WH52M7T
Just the standard issue 1996 GM with the 3100. Problem is, if you drive it just right (really light), at about 1500 RPM, under load, a knocking / ticking noise is coming from the engine which is enough to trigger the knock sensor and the ignition pulls back ig...
1990 Pontiac LeMans LE 1.6L Hesitation, Surge, Stall VIN: KLZTN5469L
This vehicle came to us after a timing belt was replaced. Stalls at idle and acts like it is fuel starved under load. When it wants to die under throttle snap, it picks up when fuel is added. Fuel pressure is fine at all times. Injector was replaced, acts the ...
1998 Pontiac Firebird Trans Am 5.7L headlights VIN: 2G2FV22G9W
This car came to me with the passenger headlight wont come up. The headlights are sometimes dim on one side and the turn signals do not work. I have no schematic for the lighting.
2002 Saturn SL2 1.9L MIL Lamp on VIN: 1G8ZF52852
I have a code p0410,the air pump does not come on when commanded by scanner.i know the fuses are good,and also tested the relay.i can jump voltage to the pump and it works.it just has no signal from the computer to the relay.does the pcm go bad on these models... Trouble codes: P0410 (Air management)

Fixes & Summaries for GM
Fix/Summary Answers
2003 Cadillac DeVille 4.6L High blower Intermittant VIN: 1G6KD54Y03
This one will need some more time to find the fix. Thanks to those who replied, first check was the grounds, they were OK. Harnes was Ok. I had followed the Alldata diag on the blower, that's why I questioned the voltages I got, Alldata has the wrong voltage v...
1996 Chevrolet Cavalier 2.2L anti theft system VIN: 1G1JC1244T
Hi guys, thanks for the tips. I went through the relearn procedure 6 times before it actually reset the system, but it finally learned the new code and is working.
2001 Chevrolet Tahoe LS 5.3L Interior VIN: 1GNEK13T61
Thank You Everyone for the responses.Alot of you said cluster i tried another cluster and still had the problem.After i opened up the harness the problem disappeared.My only thought is a possible cross comunication between wires in the harness since there was ...
2005 Chevrolet Tahoe LT 5.3L starter VIN: 1GNEC13T65
Our thanks to all who have replied to our post, we recieved many helpful replies. At this time we are waiting for a response from the owners insurance co. After digging further into the vehicle we found a huge rat chew in the wireing, numerous wires are expose...
1998 Oldsmobile Bravada 4.3L No Start, Hesitation, Surge, Cuts out, Stall, MIL Lamp on VIN: 1GHDT13W3W
I recieved numerous suggestions for a fix and finally checked what the experts were suggesting, the fuel pump!! The customer had installed an non-OEM pump less than a year ago and after finding 40 PSI when the vehicle would stall the problem was fixed. Thanks ...
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