2000 Ford Ranger XLT electrical problem

read the SM,. service manual
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https://eautorepair.net/Marketing/Default.asp

for whAT

1. EGR
2. EVAP
3. BRAKE BOOSTER
4. PCV
5. IAC
6. FPR
7. MAP

ALL? THEN RTM

Since this vehicle is approaching 20 years old there may be issues that are not related to the cold weather. Since no one appears to have yet answered your problem I can comment on the cold weather and its effects on fluids. You may need to check your water thermostat as the trans lines go to the radiator and the thermostat affects the radiator temperature. Also, old fluid may not flow as well as clean trans fluid does, the valve body in the trans may be sticking or getting insufficient pressure do to an obstruction. New fluid and a new trans filter may help on these units.

I do not know when the shift mechanisms changed to solenoid gang switches. In these types of trans some allowed for a change of a single shift solenoid without removing the trans from the truck. These used electric shift instead of using valve bodies. The connecting wires were subject to corrosion and WD40 may help.

Do not know your resources to work on this problem. A simple fluid change can be done in a quick change place. Replacing an electric solenoid takes more time but is easier done under a standing lift. Hope this helps.

check your kick down cable adjustment and fluid level

There is a transmission ID tag located on the trans with the type engraved on it.

Study up on what an Idle Air Control Valve does then make your decision. They can be expensive.
Search fault symptoms

Check your operator's manual. Make sure any and all fuses that have anything to do with the affected items are not blown and are working properly. If you can; check for loose fuse connections or wires. Hope this helps. God bless!

How do I change the 2003 Ford Ranger XLT 3.0 L Flex Fuel -Auto Trans 2wd Camshaft synchronizer and sensor . Do I need any special tools ? Are there after market parts that are precise replacements for the OEM parts ?

Sounds like the transmission fluid is getting too viscus. Might want to check it, or replace it. I would just get the trans fluid replaced. Costs 80 dollars or can dIY for 25-30$

This video shows the speed sensor and its location for a 2000 ford ranger xlt. It also describes the problems a bad sensor can give.

Sounds like the shift kit is warn out in the transmission. The overdrive line may not be able to provide enough hydrolic pressure to engage the gears to move the truck. When you switch to regualr drive, that line is able to build the hydrolic pressure to engage the gears. At a certian speed (for the transmission, certian hydrolic pressure) there is enough pressure to engage the gears in overdrive, but go below that, and you have to start in drive again. If this is the case, there is no easy fix for that and I recomend taking it to a transmission shop to have your shift kit examined. Opening up an automatic transmission requires specalized tools, clean shop enviroment, and knowlage more then the average back yard machanic has.