I have changed speed sensor. the truck will shift into 3rd gear when in motion. it will stay in 3rd gear at low speeds and high speeds. it will not down shift nor go into overdrive/4th gear. other times it may drive and shift normally.
When did you last replace trans filter and fluid? Dirt may be causing shift valve to stick.
SOURCE: 2003 chevy silverado will not shift into drive or overdrive.
transmission shift solenoid is stuck open this is a common vehicle issue in automatics and not particular to any make or model vehicle 15 dollar part and arm and leg for labor if taken in
heres an idea to try
take out the transmission filter and replace with new one make sure to take not of any metal debry in trans pan this indicates the trans had sheered its gears down and a trans rebuild is needed
the transfilter needs to be changed at a certain milage interval they can get clogged up
there is a kit you buy for your truck at any parts store
its an easy change hour of time unbolt trans pan unbolt trans filter and put new one in
kit comes with new seals less than an hour you can do it yourself
to overdrive you would feel a difference in shift badley if it was that something to keep in mind
SOURCE: truck wont shift automatic. stays in 3rd gear. can shift manually
either repair or replace the transmission...sounds like the sensor went out
SOURCE: transmission shifts hard down from highway gear only (D>3rd)
I had the same thing! It was a computer issue. It only cost me about $35.00.
SOURCE: 1999 nissan frontier overdrive problem
juan: there is a cable which comes from the transmission to the throttle linkage. This is called the TV (throttle valve) cable. This is designed to work in conjunction with the position of the throttle. I'm sure you heard the term "KICK DOWN SWITCH". Well this essentially is doing the same thing. If the cable is out of adjustment, it will have a tendency to want to downshift into 3rd.
Even though overdrive is electrically actuated, it can be disengaged by the throttle position.
There is also a coolant temp sensor which keeps the transmission from shifting into overdrive until the coolant temperature reaches a certain point. The sensor tells the ECM to tell the Solenoid it's ok to supply a ground to it.
Your overdrive switch provides a ground to actuate the overdrive solenoid. Make sure the switch has a solid ground serving the circuit.
The torque converter solenoid picks up it's ground from the ECM.
Both solenoids are served by the same power source which is a switched circuit through the ignition.
I hope I have shed some new light on your problem and given you some new direction in which to look. I hope I have helped you resolve your problem. If not, I'll be watching and will be ready to offer more help if needed. ..mybunkey
SOURCE: 95 GMC Sierra 4L60E will not shift down to 1st or up to 4th.
no power stuck in 3rd gear electric shop unless youve burnt it up good luck...www.TransmissionGarage.com
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