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2020 Sierra cruise control not working

Sawito

By Sawito
in Ask A GM Technician

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Sawito New Member

Sawito

Posted
Posted

Hello,

 

Cruise control stopped working (neither normal nor adaptive). When I press the dial to "set" the cruise speed nothing happens, also I read I should be able to change between normal and adaptive cruise by pressing the "cancel cruise" button, but when I do nothing happens.

 

Truck comes from a GM employee who had diagnosed it as  the steering wheel being the culprit (in case the switch was defective); he gave me a new steering wheel with the truck which I swapped but it did not work.

 

I guess the easy route would be to take to the dealership for them to diagnose, but since that will take longer and usually several visits: What else should I try?

 

Any specific fuse or something else I should check?

 

thanks!

 

ps. gratuitous pic of a dirty Sierra for your time

IMG_3522.jpg

Jsdirt Senior Enthusiast

Jsdirt

Posted
Posted

Wires may have been routed incorrectly and got pinched or chaffed and shorted by the tilt column or the spinning steering shaft,  possibly a bad BCM (last on the list normally, but today, just as good a chance as bad wiring), or something else is failing causing the cruise to be locked out for safety. 

 

Don't forget, you may need to reflash the BCM to accept the new switch, too. Wouldn't surprise me one bit. In such case, even if you had the J-box and laptop, it would still cost you money to GM for the downloadable files. I'd make GM deal with their crappy engineering and workmanship, personally.

Sawito New Member

Sawito

Posted
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Posted
2 hours ago, Jsdirt said:

Wires may have been routed incorrectly and got pinched or chaffed and shorted by the tilt column or the spinning steering shaft,  possibly a bad BCM (last on the list normally, but today, just as good a chance as bad wiring), or something else is failing causing the cruise to be locked out for safety. 

 

Don't forget, you may need to reflash the BCM to accept the new switch, too. Wouldn't surprise me one bit. In such case, even if you had the J-box and laptop, it would still cost you money to GM for the downloadable files. I'd make GM deal with their crappy engineering and workmanship, personally.

Thank you very much, will schedule a visit to the dealership next week.

 

cheers!

  • Like 1
  • 2 weeks later...
Doug_Scott Senior Enthusiast

Doug_Scott

Posted
Posted

Never fix yourself what is free at the dealer.  You make one simple mistake and short something out, you will be paying for the denied warranty claim.

tlaw91 Enthusiast

tlaw91

Posted
Posted

Sounds like they didn’t recalibrate your camera after the recall was performed
Probably had quick lube do it
Probably done wrong
Ask how I know...[emoji849]


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