1993 Dodge Dakota No Overdrive

STEVENGUMBS1

MEMBER
1993 DODGE DAKOTA
6 CYL
2WD
AUTOMATIC
130,000 MILES

I have a 93 Dakota 2WD 3.9 V6 Automatic 130,000 miles. Transmission fluid and filter is fine. All gears shift smoothly except it will not shift into overdrive at all. It just started a couple weeks ago, once in a blue moon it will shift into to overdrive but when you let off the gas it will shift out.
** I get a code 45
Governor pressure solenoid circuit, Overdrive solenoid circuit, Governor mid-pressure malfunction, Overdrive switch low.**
And a Code 37
Transmission temperature sensor detected no temperature rise after start.**Or Transmission temperature sensor voltage too low or too high.**Or Relationship between engine speed and vehicle speed indicates no torque converter clutch engagement.**Or An open or shorted condition detected in the torque converter part throttle unlock solenoid control circuit.**

Can any body tell me what parts or sensors I need to replace to get my overdrive back, I need my overdrive. Thanks

1 Reply

CH112063

MECHANIC
1,320 POSTS

I feel that you must take this one thing at a time, some codes are tripped because of the conditions caused by the one bad sensor, like the distance sensor(speed sensor. Although I don't like the temp. Code, you must seperate the soft codes from a hard code(one that comes right back after disconnecting the battery within 3 starts). I don't like calling parts online, but I have worked with this overdrive unit extensively. No gov. Press. Sol. Exists on a 93 42RE. But with no 4th gear, all of those codes may show up on a different scan then the Chrysler DRBIII. Don't drive it like this. Even with a gun to my head I would ask to smell the fluid, before trying a speed sensor first. Look at the transmission wiring harness itself as that is a lot a miles. And iy is common to all.
The overdrive unit is on the back of the trans, it can be shot and you won't always see it. Tough to repair online.
So good fixing. Disconnect batt. Re scan, is it ok with OD switch off? If it still has the switch keep it off. Till repaired.