The engines of my sons geotrax will not respond to the remotes and they all have fresh batteries

According to the Instruction Manual it requires 6 AAA batteries, you will need a Phillips screwdriver to access the panel where you must replace it.
The remote controller and the engine need batteries.
Engine
• Locate the battery compartment on the back of the Engine. • Loosen the screws in the battery compartment door with a Phillips screwdriver. Lower the battery compartment door and insert three "AAA" (LR03) alkaline batteries. • Close the battery compartment door and tighten the screws with a Phillips screwdriver. Do not over-tighten. • If this product begins to operate erratically, you may need to reset the electronics. Remove the batteries and replace them in the toy.

Aha! I found this on another forum and it worked for me!

I had some luck using a trick I read on the yahoo geotrax group.
Make sure you have good batteries and hold the controller in the forward movement position. Then run the train forward repeatedly on a surface with friction (I used my pant leg). I got two old trains to work again, and I'm hoping to fix one more.

The theory is that this works because it uses a magnetic coupling instead of a direct drive.

It only took me one super gentle swipe across my leg! Better than smacking/bashing them because that can knock wires loose and stuff. Hope this helps everyone! :D

Yes! Thank you! Holding the remote in forward and running the train over and over worked! It took me a few tries, and finally I did it for about 30-40 seconds continuously, and it worked!!!! Thank you!!!

I had the same problem with two of our three engines. I read somewhere that you can get them running by hitting the side of the engine against a hard surface. I can't believe it... IT WORKED! I guess the motor gets **** and hitting it will get it going. All three engines are working now.

I had the same problem with two of our three engines. I read somewhere that you can get them running by hitting the side of the engine against a hard surface. I can't believe it... IT WORKED! I guess the motor gets stuck and hitting it will get it going. All three engines are working now.

Buy a used remote on ebay, put new batteries in it, take it to a dealer and have them test the remote, if it is good have them teach your car to respond to it. it won't cost much and make your son pay for it.

I assume you have batteries in the engine. If the engine light comes on and the remote makes noise, the engine motor may be stuck. Try hitting the side of the engine against a hard surface, which may get the motor moving. I had this problem with 2 engines and fixed both of them.

I had the same problem with two of our three engines. I read somewhere that you can get them running by hitting the side of the engine against a hard surface. I can't believe it... IT WORKED! I guess the motor gets stuck and hitting it will get it going. All three engines are working now.

Remove batteries, let it sit for a minuit then put in some fresh batteries.

Still not working?

Plug it back into your computer and load Harmony Remote software. Click on "update remote" this will reload the firmware and programming.

I've had a couple harmony remotes go wackey on me but normally re-loading the programming or putting in fresh batteries fixes em right up!

Cheers,

Kevin

Try resetting it.
Remove the batteries and hold down the POWER button on it for 30 secs. Then replace the batteries with fresh ones.