No accessory mode, no start?

[coolwhip120]

Hey y'all, I have a 2018 Ram 1500 5.7 tradesman. Today I tried to turn it on and it wouldn't turnover whatsoever, it won't even go into accessory mode. I got the jumper pack charging right now since I know it's most likely the battery, but is there anything else that would cause this issue? The fact that the power locks and lights work but not accessory mode is making me worried that something else is wrong. Thank you!


EDIT: Here is a video of what's happening --> https://youtube.com/shorts/FQ2L1Y88mvY

 

[SitKneelBend]

Hey y'all, I have a 2018 Ram 1500 5.7 tradesman. Today I tried to turn it on and it wouldn't turnover whatsoever, it won't even go into accessory mode. I got the jumper pack charging right now since I know it's most likely the battery, but is there anything else that would cause this issue? The fact that the power locks and lights work but not accessory mode is making me worried that something else is wrong. Thank you!

You're starting in the right place. If that doesn't work pull trouble codes and post them (when the battery fails there can be A LOT of codes)

 

[coolwhip120]

You're starting in the right place. If that doesn't work pull trouble codes and post them (when the battery fails there can be A LOT of codes)

Will OBD2 scanner still work if the truck doesn't get into accessory mode? I tried boosting it but it didn't work, same issues. Lights work, power locks work, but the gauge cluster doesn't show accessory mode when I turn the key, nor does the radio come on

 

[Daw14]

Check your battery terminals for cleanliness and torque

 

[coolwhip120]

Check your battery terminals for cleanliness and torque

I did take a peak when I tried boosting it, terminals are spotless and I tightened both cables just to make sure but neither were loose

 

[SitKneelBend]

Will OBD2 scanner still work if the truck doesn't get into accessory mode? I tried boosting it but it didn't work, same issues. Lights work, power locks work, but the gauge cluster doesn't show accessory mode when I turn the key, nor does the radio come on

Maybe? Not sure honestly.

 

[coolwhip120]

Maybe? Not sure honestly.

Yeah, I can now confirm that OBD2 is not working so I can't even pull codes

 

[SitKneelBend]

Yeah, I can now confirm that OBD2 is not working so I can't even pull codes

I'd take the battery out and go have it tested next.

 

[04fxdwgi]

While it's out, check the main fuses at the battery terminal and their connections. Corrosion is the devil.

 

[JETJET89]

@coolwhip120 did you figure out the issue you were having? I’m having the same problem!