Cruise issue?

[MeTo]

The cruise control has been working fine. Now it disengages when ever I'm going up a steep hill, usually with the trailer. It happens when more than about 1/4 throttle is needed to maintain speed.

No CEL light, no codes other than the chip code. I do have a resister on the brake light switch because I eliminated the 3rd brake light and cargo bulbs. I used the econo tune, so boost was around 11 psi when the cruise disengaged? Boost will go up to ~21 psi.

Of course this began on my trip to Yellowknife (5875 miles). Other than the cruise, no problems. Mileage was 14.7 to 18.1 pulling the tin can.

 

[gnxtc2]

Check the brake/cruise switch on the master.

Billy T.
[email protected]

 

[MeTo]

Check the brake/cruise switch on the master.

Billy T.
[email protected]

Thanks, I did. The cruise does not disengage randomly. It only disengages when more than about 1/4 throttle is applied by the pcm.

 

[Bugman]

The first thing that I would do with something like this is to pull the chip and get it back to stock and see if it happens.

 

[rockycreek]

The first thing that I would do with something like this is to pull the chip and get it back to stock and see if it happens.

:whs:

 

[MeTo]

Tried removing the chip, the problem remains. Anything else, I would really like to not have to take it to the stealership?

 

[79jasper]

Thanks, I did. The cruise does not disengage randomly. It only disengages when more than about 1/4 throttle is applied by the pcm.

Pretty sure that's normal.
Requested throttle doesn't have much to do with it.
It's speed loss.
Iirc, something like a 5mph drop will cut off cruise.

Sent from my SAMSUNG-SM-G935A using Tapatalk

 

[MeTo]

Pretty sure that's normal.
Requested throttle doesn't have much to do with it.
It's speed loss.
Iirc, something like a 5mph drop will cut off cruise.

Sent from my SAMSUNG-SM-G935A using Tapatalk

My truck has more than enough power to maintain speed. The cruise
control will not give the engine enough throttle. When it disengages,
I just give it some throttle until I'm back up to speed. Then, reset cruise.