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Question
I have a 95 Eldorado base coupe with Traction disabled message and ABS light on...ran on-board diagnostics and get current codes I034 & T077 can't clear pcm because it says no pcm data.With traction disabled I don't have first gear,A/C won't blow cold and dashes in fuel read-out area.What and how would I go about fixing this problem.Changed front hubs thinking it might be bad wheel sensors but still have same issue....Help!!

Answer
Hello,

Diagnostic codes in the computer are pretty much worthless and only give you an idea as to the circuits failing. One code can cause a cascading effect as well. As you found, guessing as to the problem is just a waste of time and money.
To repair this problem over the Internet is not going to happen and requires personal interaction with the vehicle.Never go to a dealer for repair, because the will guess as good as you replacing perfectly good components and giving you a bill for an unrepaired vehicle.
there are only two ways of diagnosing the exact problem. One is to go to a reputable service center that has a Tech II scanner.
The scanner checks all computer and sensor circuits and possibly can pin point the problem.
The other option is to go to Craigs list or Ebay an obtain a factory service manual for this vehicle. The manual has diagnostic flow charts you can follow to pin point the exact problem. We relied on the manual at the dealer to repair any problem.

With the check engine light on and not being able to start from first gear, your emision system is ot functioning properly and engine performance also suffers.
You cabn see if you can download a manual from http://www.alldata.com, but the vehicle might be to old for them to have one.

One cannot change parts on a guess to a computer controlled vehicle. The computer (BCM) compensates and will set off codes unrelated to the original problem.
I just don't want to see you wasting anymore money.

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Rob Painter

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Alarm system questions cannot be answered on this forum. These systems are not what I can answer. Without being physically at the vehicle and not knowing what kind of electrical service has been done on the vehicle, there is no possible way to give an accurate answer over the internet. My expertise is in Ignition/key based anti-theft systems. These issues include GM VATS (resistor chip in key blade) PASSLOCK (MRD)-ignition lock rotation based, no special ignition key and the PKIII Transponder (computer chip in key) systems. These systems are not alarm based and are integral with the starting of the engine. This is why I cannot diagnose alarm problems without physically looking at the vehicle: Alarm systems are a completely different annimal than ignition key/lock based anti-theft system. Many alarm questions come from vehicles 10 years old, and since older, many hands that had been involved over the years.I am an expert in all GM factory (ignition/key based)systems. Alarm system questions pose to many situations beyond my knowledge as to what has been done to the vehicle over the years. Some guy may have actually wired the stereo into the alarm system. Who knows? Over my past 30 years in vehicle wiring repair, I have seen unbelievable wiring disaters done by guys that consider themselves "mechanics." I have seen stereos and alarms intalled using surgical tape. I have seen modules burn up, un-fused circuits, wiring jambed between the doors and even lamp cord used for a starter kill. To answer alarm questions over the internet without examining the vehicle is like asking; What does it take to remove a dent?

Experience

Education/Credentials-ASE certified. 11 years with a GM dealer and 17 years with a repair facility dealing with only the repair of theft recovered vehicles.

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