DD15 no throttle response in top gear

Tank618 · Dec 8, 2019

allisonisatranny said: ↑

No QC. We are a slip seat company with the same trucks. This one is a bad apple
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Did you ever get this figured out? I’m having the issue with a 09 Cascadia

Bobtail0994 · Oct 14, 2020

Did you ever find an issue

allisonisatranny said: ↑

What would cause this? When accelerating, truck is governed at 65 MPH. While accelerating up to top speed, at 60 MPH computer kills the throttle and boost quits, it waits a few seconds then power will return.

Scenario two, you're doing 65 MPH on flat land and you hit a hill. The throttle is non responsive, it takes about 5 seconds and power comes back in increments of 20%, then 40%, then 50%. Normally, a similar truck with same specs/engine will boost instantly once it hits 64 MPH to resume the 65 MPH set speed.

I've driven two trucks like this, one was a brand new 2015 Cascadia with a DD15 and a 10 speed. This one I'm having trouble with is a 2010 Columbia with EPA '07 DD15. There has to be something in the ECM, some kind of eco-friendly setting. But what? Where?

This truck does not have progressive shifting, over rev protection, or RPM limiting in any gear. SO it has nothing to do with that.
Click to expand...

allisonisatranny said: ↑

What would cause this? When accelerating, truck is governed at 65 MPH. While accelerating up to top speed, at 60 MPH computer kills the throttle and boost quits, it waits a few seconds then power will return.

Scenario two, you're doing 65 MPH on flat land and you hit a hill. The throttle is non responsive, it takes about 5 seconds and power comes back in increments of 20%, then 40%, then 50%. Normally, a similar truck with same specs/engine will boost instantly once it hits 64 MPH to resume the 65 MPH set speed.

I've driven two trucks like this, one was a brand new 2015 Cascadia with a DD15 and a 10 speed. This one I'm having trouble with is a 2010 Columbia with EPA '07 DD15. There has to be something in the ECM, some kind of eco-friendly setting. But what? Where?

This truck does not have progressive shifting, over rev protection, or RPM limiting in any gear. SO it has nothing to do with that.
Click to expand...

Did you ever find a solution to this problem. My 2011 cascadia’s throttle acts erratic after 60MPH, the governor is set to 65MPH but it feels like it cuts out at 60MPH. Cruise and Jake are not working either.

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