U1267 code

[Drizzy]

Leaving sons bball game the other night ram wouldn’t start. Would click. Thought it was alternator. Got jump. Next morning started up little sluggish. Took over to Autozone. Battery alternator and all charging system tested fine.

Check engine light on.

Autozone hooks up to look at codes. Diagnosed as u1267. Turn truck off. Check engine light off.

Now this morning little sluggish to get started again as well as check engine light one now.

What could be the issue?

 

[Richard320]

I'd suspect the battery first. There are countless posts here wherein a "tested good" battery caused all kinds of electrical
gremlins.

Second thing I'd check (and it's not something easily done at home) is alternator pattern aka diode test. There are three sets of diodes and if one goes bad, you'll still charge okay, though more of an AC waveform, and when the truck is off, current will flow backwards and turn the alternator into a resistance heater and drain the battery.