Truck won't stay in tow haul mode

[WXman]

When I hook the trailer to my truck the truck automatically goes into tow haul mode. But then if I shut the truck off and turn it back on again it doesn't stay in tow haul mode it defaults to normal. Why is that?

Also I'm noticing that I get frequent messages that the trailer has been disconnected and it has set the alarm off on my truck even though the trailer is still connected. What's going on?

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[Heliian]

Drive mode defaults to normal on a power cycle.

If the trailer says disconnected randomly then your trailer wiring is going bad. For some faults it will tell you what circuit but a ground fault just disconnects. I just had to put a new flat 4 on my utility trailer due to this.

 

[P-38]

The drive mode defaults back to normal no matter what on a power cycle. No great reason, just the way it is. It has been speculated the it has to do with EPA and MPG testing.

No idea on your second question.

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