2009 Dodge Ram 2500 rear running lights and turn signal problems

[g1ddyup]

I'm trying to figure out why my running lights and left turn signal are not working. Reverse light works fine. Right turn signal works fine. How the trailer lights and functions with the trailer plug work fine career Every fuse in my fuse box seems to be OK. Tested with a continuity tester on both sides of the fuse. Don't really know where to go next. Any help would be greatly appreciated. BTW Front lights work fine. And I'm speaking about the rear lights having problems. Thank you

 

[SitKneelBend]

I'm trying to figure out why my running lights and left turn signal are not working. Reverse light works fine. Right turn signal works fine. How the trailer lights and functions with the trailer plug work fine career Every fuse in my fuse box seems to be OK. Tested with a continuity tester on both sides of the fuse. Don't really know where to go next. Any help would be greatly appreciated. BTW Front lights work fine. And I'm speaking about the rear lights having problems. Thank you

Have you scanned for any trouble codes?

 

[g1ddyup]

Yes it did. The codes are Below. I wasn't sure what to do with the entire report so I put it in my About me section on my profile. I recently got an OBD link MX plus and Alpha OBD And still learning. I replaced the bed with a flatbed and these lights stopped working somewhere in the transition. I'm using the trailer lights for lights on my truck bed currently. Thank you
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Reading faults for: Central Gateway Module
___________________
Faults reported:
2025/08/03 16:27:44.024
Faults found.
C1000
B1644
B1669
U0184

 

[SitKneelBend]

Yes it did. The codes are Below. I wasn't sure what to do with the entire report so I put it in my About me section on my profile. I recently got an OBD link MX plus and Alpha OBD And still learning. I replaced the bed with a flatbed and these lights stopped working somewhere in the transition. I'm using the trailer lights for lights on my truck bed currently. Thank you
_____________
Reading faults for: Central Gateway Module
___________________
Faults reported:
2025/08/03 16:27:44.024
Faults found.
C1000
B1644
B1669
U0184

If I had to guess, there are wires that are unpinned or pinned in the wrong location. Was the bed purchased made wit ha harness specifically desinged for your truck year/model? You can use this site to look up the wiring for your truck and compare it to the wiring instructions for the new bed to help hunt down the issue.

Mopar Connection Repair Kit

connectorrepairkit.mopar.com