Most common reason is your ABS Speed Sensor.
I'm going to assume you only have the basic rear-wheel antilock (RWAL) instead of the 4-wheel ABS, but it probably applies to 4-wheel too.
If you climb under your truck and look at the rear differential, there will be a sensor inside a cage. Remove that single bolt on top and remove the sensor. If you have a multimeter, measure the resistance. Should be somewhere near 2400 to 3000. If it measures infinite or 0, the sensor is bad.
Go to your local junkyard and grab one -- either from the trucks or the fullsize vans, the sensors are the same. You're looking at maybe $5 - $10 for the part.
If you have to buy the part new, or simply refuse to install used parts, the sensor can only be ordered from Chrysler for $80.
SPONSORED LINKS
Monday, March 1st, 2021 AT 12:42 PM