All,

I have a 2001 Dakota 5.9L AWD/4x4 SLT that I have been babying along. Runs great and hope to get a few more years out of it.

Recently the truck experienced the "nobus" issue. We purchased a refurb/verified/tested ECM/PCM. Everything is good for a week. Then the lights start flickering. Mechanic checks it out for ground issues. Everything seems to be good. No blown fuses, etc. We decide to replace the CTM. We purchased an exact CTM off of ebay. Installed and lights are no longer flickering. Yay!

But... the headlights now have an issue. When switching between low and high, the following happens:
LOW BEAM SETTING: Left low off, Right low on
HIGH BEAM SETTING: Left high on, Right high off

NOTE: Update: I do not know if this problem existed before the ECM and PCM replacement.

Not sure what to do at this point. Anyone know what may be the problem?

Thank you

 

Do you have the old CTM still? Might try plugging it back in and seeing if it swaps back to flickering. Might have gotten another bad one. The thing to remember is these computers have electrolytic caps and are 20+ years old. Buying a used one might be hit or miss since if those weren't replaced they are possibly close to failing as well. Thankfully that is an easy job to fix if you have a soldering iron and good eyes.

 

Did you happen to replace the headlight bulbs recently?

 

Only changed the CTM. However, after the CTM replacement, I decided maybe the bulb blew because of the flickering before. Bulbs change didn't make a different.

 

Supadoom, I did keep the old CTM. Today I will swap back and see if the headlight issue is the same.

If I replace the newer used CTM with the older CTM (lights flickering) and the headlight issue is the same, what could be the next check to make?

 

If it doesn't revert to flickering then I would start looking at wires and connectors. If it does go back to flickering then I would go for a new CTM or try to find a shop to refurbish on of the existing ones.