In a 2007 Jeep Grand Cherokee what causes the left turn signal to randomly blink?

MAKE 100% SURE BATTERY IS GOOD AND FULLY CHARGED BEFORE BLAME IS LAID.
THEY BLINK CONSTANTLY EVEN KEY OFF?
OR STUCK BLINKING ENDLESSLY KEY ON.?
OR BOTH.>????????
AND WIGGLING THE STALK (BLINK) DOES NOT FIX IT. (Mine failed once (intermittant) and remove it and put it back and runs now or 1 full year, spare in my kit never used. sigh.
NO YOU HEARD WRONG ON RELAY, THE MIP IS SOFTWARE THAT BLINKS BLINKERS.
1995 JEEP IS NOT SAME AS 2008 OR 2010.
SO DO NOT TALK TO OTHERS ON 1995 JEEPS.
OR BELOW 2005 OR ABOVE 2010; OK?
SEE HOW GOOGLING GETS LIES.?
AND SOME OWNERS ARE CLUELESS ABOUT YEARS.
the "module left control" can not be replaced by you
and is not sold new , and most be programmed.
it is dealer only fix. and super expensive over $1000
yes the stalk is easy fix. and PnP plug and play.
why not scan the PCM first see errors. i bet.

cars are complex. I have the full service manual on this car and own one too.
first tell all that works and does not work right, in brief
engine starts?
and runs and drives:?
all other lamps work, brake, park,heads?
left blinker stuck on front and rear and the dash cluster blinking too? (3 lamps to see)>>??????????

USA answer and Car only.'
left lamps only thing failing. answer.

the front located MIP, controller has 2 sub modules
for front L/R and rear L/R
ALL LEFTS FAIL, (STUCK)
or bad stalk.
after removing mine last year, and putting it back it never failed again.

just snaps off after 1 screw.

You mean it randomly blinks on either side? If so a shorted relay sounds like the problem. Put the hazard lamps on then off and retry the indicators.

see the diagram attached and proceed according for troubleshooting.

When you are using the keyless entry you are flashing the turn signals... which are also the brake lamp filiment.
The park lamps on that side of the car simply dont work.
There is probably an open somewhere in the wire to that lamp. The lamps are fed through the wiring harness on the drivers side. Your break in the line is somewhere between the left and right in the rear. You can try to find it or run a jumper from left to right under the rug and save some pain. Your call.

mporteous, It sounds like you have a light switch problem. I can't think of any other reason for the running lights and tail lights not working in this situation. Are your brake lights working when the headlights are off and how about when they are on? Do your four ways hazard lights work in these situations? Try all the lights under these conditions. The reason the left turn signal blinks very fast is because one of the bulbs are burned out. Try the left signal and one light (front or back) will stay on and the other will not come on at all. Replace the bulb that does nothing. Do this before you try all the lights in different situations. I think that you will have to replace the light switch. Good luck with this.

POSSIBLE IGNITION MODULE,

Check your crankshaft position sensor

Sounds like the fluid is low...have you checked it? (check running in park, warmed up)

WHEN COMMING TO A STOP?
IF SO, THE THROTTLE BODY MIGHT BE DIRTY IF IT HAS HIGH MILEAGE, BUT NEED MORE INFO TO TRY TO SOLVE

likely not, but change /check anyhow....If problem persists, likely you will need to change the module that controls directionals (usually under dash to the right of steering column)