2019 Sierra Denali Power Running Board Issues


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Nov 24, 2021
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Passenger side running board is slow to deploy if it even gets that far. Mostly begins deployment then immediately retracts back to storage. Very little can be found in forums but I have found new parts at Running Board for 2019 GMC Sierra 1500 | GM Parts Online . The dealer wants almost $200 to diagnose and when pressed said they would likely just replace the entire running board assembly. Parts alone would be $1,600. I wish for the money the dealer would just pinpoint the problem and replace what is defective (motor, module, extension arm, etc)

I have tried Silicone spray on the articulating bushings to no avail. Removal of the assembly to check for binding is pushing my mechanical abilities, although I could do it with some advice. Even pulling the wiring harness connectors apart is challenging since I don't know how they lock. Thought I would turn to this forum.

Thanks in advance for any help /direction.