Strange starting behavior

[Whyjustwhy]

I have a 2019 ram 1500 hemi. Occasionally when I get in to start the vehicle and I press the start button with my foot on the brake nothing happens. I can press it repeatedly and nothing at all happens but within a few minutes it will just wake up and advance to the ACC position all by itself without me touching anything. Then if I put my foot on the brake again and press it one more time it will start. It seems to do this more often when I disconnect the battery and then reconnect it.

Have any of you ever experienced this or have any idea what could happen. When I hook up a code reader afterwards I almost never get a code. One time I got some weird code U1428: received engine torque request signal stuck.

I do still from time to time and get a P2138 code but that doesn't seem to have any correlation to the strange starting behavior.

 

[6of36]

They very well could be related. U1428 says could be signal from throttle position sensor. P2138 says accelerator signal. Check all your connections at the accelerator pedal, and throttle body, and for bad grounds.

 

[Whyjustwhy]

The accelerator pedal sensor was replaced a few weeks ago. I think I have found and checked all of the grounds in the area. Would it be worthwhile checking the ground at each of those sensors back to the negative on the battery and see if any voltage is present and also for continuity?

 

[6of36]

The accelerator pedal sensor was replaced a few weeks ago. I think I have found and checked all of the grounds in the area. Would it be worthwhile checking the ground at each of those sensors back to the negative on the battery and see if any voltage is present and also for continuity?

The ground wouldn't go back to the battery. There are 30 grounding points, on a Ram. I haven't worked as a mechanic in 30 years, so I'm no longer an expert. Being I am just using mechanical knowledge, and not knowing these things any more, it's more of an educated guess, not sure fact. I'm thinking if you did replace the sensor, and are having problems, the sensor MAY have to be calibrated. Things can be weird with computers. One other guess, is the push button switch itself, not contacting properly every time. I think they are only about $20, so if you can't find a bad ground, or loose wire, I would try that, before paying a dealer to diagnose. Good luck.