Why won't it engage first gear?

If your Honda Passport is not moving in any gear after replacing all the solenoids in the transmission, it could be due to a few different reasons. Here are some possible causes:

1. Low transmission fluid level: Make sure the transmission fluid level is correct and the fluid is not contaminated or burned.
2. Faulty torque converter: A faulty torque converter could prevent the transmission from engaging, which would cause the vehicle not to move in any gear.
3. Broken transmission pump: The transmission pump is responsible for creating hydraulic pressure to engage the gears. If the pump is broken or not working correctly, the transmission will not engage.
4. Failed clutch packs: Clutch packs are used to engage different gears in the transmission. If one or more clutch packs have failed, the transmission will not engage.

It is recommended to have the vehicle diagnosed by a professional mechanic to determine the root cause of the issue.

Transmission won't engage Drive or Reverse - EricTheCarGuy

www.ericthecarguy.com/.../53999-transmission-won-t-engage-drive-or-r...

This transmission shifted smooth and strong through all gears until today when it stopped all of ... Any idea on where we should start tackling this issue? .... Also, make sure that the pressure tester is not leaking or you will run the tranny dry(use ...

Gear shifter goes from park to drive with no effect. Won't ...

sounds like the bands inside the transmission may need some adjustment or may need to be replaced.

Make sure the 4wd shifter is in correct position and hasn't slipped out of correct spot to get you moving forward.

try to replace transmission strainer first torque convertor and see if that helps if not it probabaly the transmission

Then there is a serious problem with the clutch. turn the engine off and engage a gear and try and roll the truck, do it feel like it is in gear? if not the clutch is either defective or the transmission input shaft is broken

Do you have transmission fluid, Is the trans filter plugged in the transmission pan?

probably your transmissions plugs has to be cleaned,

Assuming the pickup is an automatic, check the transmission fluid. The #1 cause for transmission slippage is lack of Automatic Transmission Fluid.

If the pickup is a standard shift, the pin that connects the shift to the transmission has likely broken. You would still be able to shift from the inside but the gears won't engage. A bad clutch is also a possibility but you would have noticed a burning smell prior to the clutch giving out.

The oil pump in the trans most likely blew. You will need a shop to look at this.