HOW TO TELL IF YOU ARE EXPERIENCING TRANSMISSION TROUBLE:
1. THE CHECK ENGINE LIGHT
A check engine light is tied into all the computers on your vehicle. What does this mean? Any thing from the gas cap being loose to an internal transmission failure can cause the light to come on. Computer Diagnostics is the only way to properly diagnose a vehicle after 1990.
2. THE OVERDRIVE LIGHT
On some vehicles, mostly Ford, there is an Overdrive cancel light to tell you that you are out of overdrive. However, when the light starts to blink and usually accompanied by the check engine light, it means there is a transmission problem and you should take your vehicle in for diagnostics ASAP.
3. TROUBLE CODES
The first step in diagnostics is getting the codes that are stored in the on-board computer that caused the check engine light or overdrive light to blink. This is the easiest step. However, since there are usually more problems than codes stored in the computer most codes have multiple meanings and the same code can be thrown for more than one problem. Also, some codes can cause other codes to be set. This is where diagnotics gets tricky and this is where a techinician is your best bet. As a transmission shop and with the experience and tools we have come to recognize some of the patterns of codes thrown as a particular problem. Some cars can take several days to diagnose and find the underlying problem that exist. Not all problems cause a code stored. For example: when Ford Manual Lever Position Sensor (MLPS) goes bad, the transmission either quits shifting or shift hunts. Sometimes they throw a code and sometimes they don't. It depends on the computer. This is why computer diagnosis is so crucial. I have seen many times people come in and say " I need a transmission overhaul because my transmission won't shift." We diagnose and repair and save these customers thousands.
4. TRANSMISSION LEAKS
The fluid is the life blood of your transmission. The fluid in an automatic transmission does 3 things: Lubricates, cools and provides hydrolic pressure. This is why the vehicle may not move when it is running low on fluid. Transmission leaks no matter how small shold be taken care of immediatly!!! You could damage your transmission just bhy running it low on fluid once! Some signs of running low are: Slipping, Dropping out of gear, Neautral at stops, no movement and Whinning noise.