RFA battery low. What does this mean

Can you provide more detail?
Anyway please verify by this steps.
1. Possible causes area the followings:
a. Battery Terminal bad connections
b. Battery Terminal dirty needs cleaning
c. Posibble bad motor starter

Hello: The RFA stands for the Key Fob That you use to lock?unlock your doors. RFA stands for Remote Function Actuator.. Replace the battery. Go to Auto Zone and they should have the battery and probably not charge you to replace it.

check the charging system. possible low charging voltage or weak battery.

The message stands for Remote Function Actuation (RFA) battery low. This in more simple terms means that the battery in your remote for the door locks is getting low and should be replaced soon.

Just replace the battery in you keyfob remote.

Good luck.

Under hood in power distribution box stud 1 40 amp fuse

Replace the battery in you keyfob remote.

put battery on a trickle charge for a few days

The battery in your keyless remote #1 for the vehicle is low and needs replacing.

GOOGLE says the batteries in your Remote Keyless fobs/keys are low. Replace them.

Good luck,
TD

This is what i would try (cheapest first) redexe/wyyns
injector cleaner,double dose,then i have put 1gal gas in 10gal diesel to increase burn temp (you may encounter a hot start problem temporarilly)then if still smoking, get a compresion check on the engine(this will tell you volumes)
by the way the NATO tanks put in 1/3 gas in diesel to stop it freezing in arctic conditions.any more than 1/3 can result in problems.