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Prev Professional Automotive Repair Technical Discussions for October 13, 2011
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Open Help Requests for GM
Help Request Answers
2004 Cadillac SRX 3.6L Ebcm VIN: 1G1YDE6375
Good morning. This caddy came in with abs, steering, trac control, tire monitor and cruise messages on display. In checking I found the problem was brake fluid destroyed the ebcm. The whole assembly was purchased from a local salvge yard. After instalation a c...
1992 Chevrolet Corvette 5.7L No Start VIN: 1G1YY23P8N
wont start have i missed something gone all basics so i am sure no codes car been sitting came from dealer spark ,fuel air and seems to be the right time..did notice while cranking hsas no vacume at intake
2003 GMC Envoy SLE 4.2L shift VIN: 1GKDT13S73
Owner complaint: Sometimes while sitting at a traffic light, the tc engages 4lo. He can get it back to 2 hi by rotating the selector switch to 4lo, then back to 2hi. Currently the system is working fine, no current codes. History codes show C0300, 0306, 0327, ...
2008 GMC C5500 Topkick C5C042 6.6L MIL Lamp on VIN: 1GDE5C1958
This is a tow truck that belongs to a good friend and has been driving me crazy since July; I'm hoping someone can help steer me in the right direction. It all started in June when the owner replaced the air filter as routine maintenance. The filter was a dea... Trouble codes: P0101 (MAF sensor performance)
1990 Oldsmobile Cutlass Calais S 2.3L Misfire VIN: 1G3NF14D1L
i have a 90 olds with a 2.3 engine and its got a engine miss.#1 and #4 .ive switch coils,replaced coil tower 2 times replaced ignition module.now after diagnosing the car for 2 days. now there is no spark on #2 and#3.it did not change when i switched coils.it ...
2000 Oldsmobile Alero GL 2.4L abs codes VIN: 1G3NK52T9Y
put a new wheel bearing in put a new dealer section of wiring harness in pulled out the module didnt look bad did a pin to pin test wires ok keeps throwing a code c1232 for the left front wheel bearing problem
2004 Pontiac Grand Am SE 2.2L No Start VIN: 1G2NF52E94
This vehicle will not start. No spark. checked crank sensors, which seemed okay, using Vantage Pro scope. Replaced ignition module, still no start. Has original wires, and coils.
2008 Saturn Vue XR 3.6L starter VIN: 3GSDL73738
usually when you attempt to start this vue there is a 5 to 15 second delay before the starter relay engages. sometimes the starter won't engage at all unless you release key and try again. The PCM is not sending voltage to the starter relay control coil. When ...

Fixes & Summaries for GM
Fix/Summary Answers
1999 Cadillac DeVille d'Elegance 4.6L MIL Lamp on VIN: 1G6KE54Y2X
Sorry it took so long for this post, the customer couldnt be without the vehicle for long periods of time. After having scoped the ckp's, cmp, 24x, 4x and fuel control, we found that all signals were clean. Turns out Juan [...] was right, the GM dealer that d... Trouble codes: P0340 (Camshaft Position Sensor Problem).
2007 Cadillac DTS 4.6L Transmission VIN: 1G6KD57Y77
Found Dealer bulletin that says to over inflate tires to 45 psi then let all the air out then inflate to what is recommened tire pressure. If this does not correct noise dismount tires and remount. The noise is now gone.Do not know why this stopped the noise b...
1982 Chevrolet Corvette 5.7L Stall, Misfire, MIL Lamp on VIN: 1G1AY8785C
i check all power and ground connecyions. found coolant temp sensor wires pinched under bracket and both wires melted together. repaired those wires. then replaced module and coil. then checked all wires to ecm. they all check good. so i replaced ecm. first on... Trouble codes: 42 (est).
1999 Chevrolet Camaro 3.8L Hesitation, Stall, MIL Lamp on VIN: 2G1FP22K2X
Thanks to everone that took time to reply. I finally dug the whole story out of the customer.Turns out the check engine light came on while she was driving so she decided to FILL it with fuel and THEN it started running bad. It was running fine until then so I... Trouble codes: P0440 (Evap system).
1997 GMC Savana 1500 5.7L Poor Idle Quality, Hesitation, Surge VIN: 1GBFG15R7U
good morning everyone.this vehicle is fixed.i just want to say thanks to those who responded.the fix was to replace the pcm.we used an used pcm.it has been running good.costumer has been driven it for a while now.so there it is.thanks guys.and may u all have a... Trouble codes: P0102 (maf ckt low).
2003 GMC Yukon XL 1500 SLT 5.3L abs VIN: 3GKEC16Z93
Ordered a "new" module from the dealer. Turned out it is a reman unit. Installed and no longer had the c0251 but not has the c0265. Will return it as defective and see where the customer goes from here. Probably new vehicle route. Thanks to all.
2007 GMC Yukon Denali 6.2L Air Bag VIN: 1GKFK63817
2001 Oldsmobile Aurora 4.0L MIL Lamp on VIN: 1G1NE52314
Thanks for all the replies which most of you said is the valve,customer came back and the engine light was off and said it now stays off more than on and we told him about the valve and it also tested fine.He will bring it back as soon as the light comes on st... Trouble codes: P.
2002 Pontiac Grand Am GT 3.4L Tcc VIN: 1G2NV12E82
Found bad body ground at ground number G301. Also checked the charging system and alternator. Suspected a bad ground from the beginning. After reviewing all body and engine grounds, found bad ground at G301. Thanks for all the input.
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