Transmission o/d light flashes and does not shift properly
1998 Merc. Sable, 24Valve motor. At hiway speeds the o/d light flashes and does not shift into o/d or it flashes and the speedo does not responds(goes to 0). I know the car is in o/d when this occurs because I can down shift with the o/d cancel button and the rmps goes up. But on other occasions the rpm goes up and the cancel button has not been touched, rpms are running high. I had the tranny flushed and filled last year, about 10 000kms ago. Garage has had a quick look and said the fluid is already a bit brown. Car has 118 000kms and had been flushed and filled and filter changed at about 50 000kms and 108 000kms. Hope this is enough to go on. Is this a electrical or mechanical problem? What is the solution?
Re: transmission o/d light flashes and does not shift...
Sounds like u have a bad vss (speed sensor ) its located on the transmission have some one drive the car with a scan tool and check the speed when it goes to zero the scant tool will also the computer thinks you stopped pretty easy fix located on the output side of the trans passanger side
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Symptoms of a P0500 DTC may include
: loss of anti-lock brakes the "anti-lock" or "brake" warning lamps on the dash may be lit the speedometer or odometer may not work properly (or at all) your vehicle's RPM limiter may be decreased the shifting of an automatic transmission may become erratic other symptoms may also be present
Sounds like a coil breaking down. Try this for a test, get going to around 45 mph and lightly accelerate, is the is miss is reproduced then the most likely cause is the secondary ignition system. I.E plugs or wires or a coil.
Which seal was replaced? The torque converter (or main seal). Or one of the axle seals? Or another seal somewhere else? Usually the O/D light flashes when you have a TCC solenoid or shift solenoid problem. Like... if there's no power going to the torque converter lock-up solenoid, It will not go into fourth gear because the tcc solenoid cannot lock up the torque converter properly. Depending on which seal you've replaced, it may just be a coincidence. Maybe the light would have done this regardless. Either that or maybe something is not connected tightly. Maybe one of the transmission connectors. I had the same light flashing in mine when I disconnected the valve body wiring connector because my torque converter was locked up solid and that was the only way I could move the car into the garage. I would take a good look at the transmission connectors and make sure that all the connectors are tight. I hope this helps, good luck!
yes, it's the speed sensor. It is mounted in the transmission above the axle as seen in picture below. The part is $24 at autozone.com. Before buying the part, make sure the connector is properly attached to the sensor and the wiring is intact. If the wiring is good, the sensor is most likely the problem. let me know if you have any more questions.