Limp mode/ check engine/ slip indicator/

No vehicle will start if the battery voltage is 11 volts or lower due to the EFI.

The Check Engine Light came on, so there are Diagnostic Trouble Codes (DTCs) to be read. The code tells the issue and the from there you can Google the fix. You need to find out why your battery was discharging and not being charged at highway speeds. A professional grade scan tool computer can also check the transmission solenoids as the scan tool is bi-directional. It can command a solenoid to operate and then verify that it did. It can also read historical data, what was happening when it stopped running. Limp Mode is just there to protect the engine from further damage. There is probably a sensor failing somewhere, although the battery depletion is a puzzle.

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https://www.google.com/search?q=2018+28Z+Thor+Motor+Coach+limp+mode

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Any light's lit on the instrument cluster ? Wrench symbol , check engine ? Any messages - DIC - driver info. center ? 2007 Chevy what 2500 hd ,silverado etc... What size engine 6.6 L .Probably a problem with electronic throttle control . Your best bet ,dealer

that is a hum dinger, largest ever posted, in one shot.
very good.!
one word , the transmission slips. (never drive a slipping tranny)
overheat indicator.! that is key.
many newer cars will change the transmission shifting any time
the engine over heats.
and overheat wins over transmission , every time.
if the engine burns up, what good is any transmission.? nada.

solve overheat first.

slip or flare.
is when the engine RPM rises fast and the car dont go faster.
SLIPS.
and slipping burns up trannyclutchs and increases the damage. inside the transmission, dont do that. dont allow it,
park it and fix it.

on some tranny there is a temperature sensor that the TCM
watches and changes shift patterns based on AFT fluid temps.
and if the ATF fluid gets too hot , it takes actions. to keep the tranny from harm.

why not get a scan too and see what DTC errors there are..
DTC, engine overheate.
DTC< tranny overheat (caused by above)

Any poor performance of the transmission with indicator lights on the dash mean you have problems that need to be resolved immediately...

engine size, etc., I can only make educated guesses, but here goes: You stated "My car will drive, but very slow hardly moving". My first suspicion is that you don't have a transmission problem, but the car is in what Chrysler calls the 'limp-home mode'. This occurs when the computer 'sees' a problem with an engine function or sensor that is serious, but not so bad that the car won't run at all. Limp-home mode allows your car to only operate in second gear so that you won't damage it further by driving normally, but won't leave you stranded either. Is your 'check engine' or 'service engine' light on? If not, check to see that it actually works by turning the key 'on', but not starting the car. All the dash lights should be lit for about 3-5 seconds. No matter what, you need to check your transmission fluid level (on a Crysler, should be checked with the engine running and in gear, NOT park or nuetral). Safety first, make sure someone is holding the brake on - please don't ever trust a 'parking brake' for this. If the fluid level is OK and there's no 'check engine' light you need
to visit a competent transmission shop. Probabably a worn front pump, torque converter, or a hung spool valve in the valve body, none of which is generally fixable at home. If you do have a 'check engine' light on, see a regular mechanic first as there is a mechanical problem probably not related to the transmission. Good Luck!

If both remotes light up and don't work even right next to the car, the car and remotes may need to be paired again. I found where someone mentioned disconnecting the car batter for more than one minute but less than five and seeing if it works again. If not, you may have to get it checked at a dealer. Most of these fobs are only programable with special tools at the dealer. I've purchased nissan oem fobs new on ebay, but still had to pay the local dealer to get them to work.

PO456 is most times a gas cap or gasket,
to get an incorrect gear ratio the transmission has probably started to slip.

Change the fluid and filter first off in the transmission and use only atf+4 fluid and possibly the govenor pressure sensor,and change gas cap.

the light indicates that the trans is in limp mode. should be checked.
good luck

is itr the oil light ??check oil level anyway ,iam colour blind so i have a job with the yellow green and red bulbs so i always look at the symbols green is normally generator,yellow indicators and red oil light pressure ,well it was when i was young

Without knowing the year, engine size, etc., I can only make educated guesses, but here goes: You stated "My car will drive, but very slow hardly moving". My first suspicion is that you don't have a transmission problem, but the car is in what Chrysler calls the 'limp-home mode'. This occurs when the computer 'sees' a problem with an engine function or sensor that is serious, but not so bad that the car won't run at all. Limp-home mode allows your car to only operate in second gear so that you won't damage it further by driving normally, but won't leave you stranded either. Is your 'check engine' or 'service engine' light on? If not, check to see that it actually works by turning the key 'on', but not starting the car. All the dash lights should be lit for about 3-5 seconds. No matter what, you need to check your transmission fluid level (on a Crysler, should be checked with the engine running and in gear, NOT park or nuetral). Safety first, make sure someone is holding the brake on - please don't ever trust a 'parking brake' for this. If the fluid level is OK and there's no 'check engine' light you need
to visit a competent transmission shop. Probabably a worn front pump, torque converter, or a hung spool valve in the valve body, none of which is generally fixable at home. If you do have a 'check engine' light on, see a regular mechanic first as there is a mechanical problem probably not related to the transmission. Good Luck!