Service Electronic Throttle Control?

[Dmeizy]

I have 2016 3500, and about two months ago, it started throwing a light that says “service electronic throttle control,” sometimes accompanied by the check engine light.

Turning the truck off and back on will sometimes clear the “service electronic throttle control” light.

It seems like it has begun to come on more often now. It throws code P2122 (accelerator pedal position sensor 1 circuit low), and my MM3 also shows code P0652 (sensor reference voltage 2 circuit low).

So far, I have tried unhooking the batteries for 20 min, installed new batteries, put on a new TPS sensor, and reloaded my tunes.

It usually throws the code when I let off the throttle or brake, so I thought a new TPS would fix it.

I installed a new one, unplugged the negatives on the batteries for 5 minutes, reconnected, and went for a drive.

The light came on w/n the first mile when i slowed down to turn.

It also throws code U010E (lost communication with the reluctant control module); I think this is unrelated, but I am not sure.

The truck starts and drives fine.

At this point, I’m kind of at a loss.

Can anyone help me out with this problem?

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[Corkey]

@AK Bob

Do you have a PDF on this?

Did you replace one battery or both?

My first guess was low voltage on batteries which Cummins is prone to throwing oddball codes.

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[AK Bob]

Yes, see attached information on the trouble codes.

The U010E code can be ignored as that is normal when on a diet.

I suspect you may have a 5V reference intermittently shorted to ground.

I would start by following the P0652 troubleshooting guide.

Inspect the connectors and harnesses of any of those five sensors that have been disconnected for possible intermittent short to ground.

They are all connected and share the same 5V reference, so you can monitor any of them with a voltmeter, key on, engine off, and then disconnect one at a time and move the harness while looking for the 5V reference to drop out.

I suspect the 5 Volt reference for these five items is also shared internally in the PCM with the APPS1 connection causing the P0652 code.

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