Is the scanner enough to detect an auto transmission problem?

Question:
My 2000 Honda Odyssey had the Check Engine lit and the shift to the 2nd gear was getting worse each day. These symptoms were provided to the shop but they refuse to give me an estimate based on the scan result.

Answers:

Are cars more reliable now or then?

A scanner will give a technician a lot of information, point him/her in the right direction, but is NOT by any means a guaranteed diagnosis! A scan Tool indicates there is a problem in a particular circuit of the transmission. It could be a sensor problem, a wiring problem (chaffed or corroded wire, or a loose terminal), bad ground circuit, or even the computer itself. This is where diagnostics come into play. Once you know what area the problem lies, then the technician must eliminate "known good" parts of the circuit. This will generally lead to the proper diagnosis ( what is actually defective) and the subsequent repair.
Also, with transmission problems, a technician normally does several pressure tests to test for internal transmission leakage, like bad piston seals or overheated clutch packs. The Torque converter must also be checked for "stall speed" and proper "Lock-up" operation.
So to answer your question, a scan tool is very useful in diagnosing a problem, but does NOT necessarily tell you exactly what is wrong with the vehicle, just a direction to work towards.

Scuff or Rust?

BTW, sorry for jareiharts' ( aka ticklemetimbers) crude comment below, I don't know what he's got against me, but he insults me constantly. He is nothing more than a troll. Please report him!

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