Only low speed working on wipers

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Have a 2014 GMC Sierra 1500 SLE and only the low speed is working on the wipers. When I switch to high speed the wipers still work but only on the same low speed. Everything else works on the switch. I replaced the switch with a new one and still the same results, only low speed movement when switched to high speed setting.

Any thoughts or recommendations?

[newdude]

Motor or the transmission bad/binding.

[calgator73]

Could be as simple as a BCM software issue. Don't think the switch is directly wired to the relay and motor. It signals the bcm and the bcm takes action.

 

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[j13smiley]

Do these newer trucks still have the little control board under the cowl? The older ones did and the elements would ruin the board.