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Re: truck shifts up and down by its self it is a 2000...
The OD light flashing indicates a code has been stored in the trans control module. If the speedo stopped working that could be the whole problem, the most common thing for the speedo quitting is the sensor on the top of the rear end housing, that causes 99% of the speedo failure. If that sensor isn't working the ABS light would be on too (if equiped) I would try that first or get a code pulled out of the computer and I could give you a more complete answer. -Jared
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I think it may be an electrical issue but I think it's just a fuse. There are 2 fuses I would check. One of them is a 15 amp fuse inside the fuse panel inside the vehicle (see fuse layout below) and the other is a 40 amp fuse in the fuse panel under the hood of the vehicle in the engine compartment (see other picture below). I marked the fuses to check and hope this is the problem.
Did you notice if your speedometer quit working at the same time? If so, there is a glimmer of hope, it may be a vehicle speed sensor problem. Otherwise, it sounds like the trans just took a dump. Try shifting the trans into ALL gears (including 2 and 1) to see if that makes a difference.
There is a speed sensor for the transmission inside the speedometer gauge. if the speedometer cable is broken the hold light will blink. indicating a trans malfunction code and the transmission will not work properly. do not drive too long without a speedometer cable.
Hello your speed sensor is malfunctioning this is connected to your speedometer.this is usually located on the top of your transmission 10mm 0r 3/8 bolt single plug this will restore your vehicle speedometer.
The transmission quit shifting, and the speedometer quit working.
When you say the transmission quit shifting, do you mean you backed out of your driveway, started driving down the street, no speedometer, and you just stayed in 1st as the engine RPM's got higher and higher ?
Please explain what has happened. You should also have a check engine light on in your dash. You will have to plug a OBD II reader in to pull any codes, so we can help you find the problem. Please let us know.
1993 mx-6 v6 "hold" light flashes, speedo doesnt work but car shifts fine. mechanic at mazda says that there is no way to tell if its the guage cluster or ecu- recomends junkyard replacements of both or do cluster first then try ecu. Checked speed sensor and wiring and says they are fine. we paid alot for this diagnosis figured i would pass along.