ABS, 4WD, ACC, Blind Spot, and drivers side power step randomly stopped working

[izzyjllamas]

Hi friends,

I have a 2019 1500 Limited

Hopefully not the wrong area to post, long story short yesterday I got in my truck and without any previous incidents I have now have basically every warning light on for non-engine issues. ABS, 4WD, Cruise control, parksense, etc and on top of it the power step on the left side. Dealer can't get to my truck for a few days, but I'm puzzled on what could be the cause of such an odd array of issues. Speed sensor? Bad wiring? Just wondering if anyone has seen these issues.

 

[vincentw56]

Hi friends,

I have a 2019 1500 Limited

Hopefully not the wrong area to post, long story short yesterday I got in my truck and without any previous incidents I have now have basically every warning light on for non-engine issues. ABS, 4WD, Cruise control, parksense, etc and on top of it the power step on the left side. Dealer can't get to my truck for a few days, but I'm puzzled on what could be the cause of such an odd array of issues. Speed sensor? Bad wiring? Just wondering if anyone has seen these issues.

View attachment 191806View attachment 191808

Bad wiring or a short somewhere. Mine was from my aftermarket exhaust melting the wires on top of the rear diff.

 

[kapinallinen2]

Hi friends,

I have a 2019 1500 Limited

Hopefully not the wrong area to post, long story short yesterday I got in my truck and without any previous incidents I have now have basically every warning light on for non-engine issues. ABS, 4WD, Cruise control, parksense, etc and on top of it the power step on the left side. Dealer can't get to my truck for a few days, but I'm puzzled on what could be the cause of such an odd array of issues. Speed sensor? Bad wiring? Just wondering if anyone has seen these issues.

View attachment 191806View attachment 191808

Not sure about the power step.
I had a similar thing happen, pretty sure the original culprit was the right rear wheel speed sensor, it had a fine layer of rust build-up on it, killing the signal.
Me, monkeying around and swapping the sensors, somehow ended up damaging the left rear sensor wiring, should have had my glasses on.
Anyway, check to see if one of the wheel speed signals is missing/intermittent. I used alfa OBD and OBD MX+
Also, check for water intrusion in the back, the RF hub could be involved.

 

[tristainbdts]

hopefully the dealer got this resolved for you. but it could be a one or mulitple modules acting funny on the CAN communication lines. their is multiple modules on one communication line if one out of the 5 or 6 on it is putting out weird signals it could make the rest of the modules on the same communication line drop out. The CAN systems on our trucks are simple but can be a headache for diagnosing issues. Their is no easy was to diagnose a communication issue. the easiest way i have seen to trouble shoot is to find out which module are on the communication to go and unplug each module one by one until communication is restored. but you will need a proper level scan tool to see when its restored , along with every time you unplug a module it is going to set a no communication codes for that specific module so you constantly clearing codes.