Cruise Control Not Working

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Dec 16, 2025 | 12:20 PM

#16

Fasces

Thread Starter

4wd Low

Joined: Sep 2017

Posts: 10

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Quote:

Originally Posted by Kwikkordead

Years ago my cruise control quit working and the issue was a spotty signal from the speed sensor in the differential. Has to be 15 years ago now and it's been solid since then.

Wouldn't a malfunctioning speed sensor cause speedometer issues as well? I do not have any problems with vehicle speed. It has always been spot on.

Sorry for the months delay, other priorities came up.

Dec 16, 2025 | 12:21 PM

#17

Fasces

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4wd Low

Joined: Sep 2017

Posts: 10

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It was through an autozone. They sent it out to a contractor.

Dec 16, 2025 | 12:28 PM

#18

Fasces

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4wd Low

Joined: Sep 2017

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the "NO" meant "Not On"
had to look for that. Usually, NO means normally open.

Dec 16, 2025 | 01:30 PM

#19

Kwikkordead

Fleet Owner

Joined: Jun 2004

Posts: 25,090

Likes: 1,112

From: Rio Rico, AZ.

Quote:

Originally Posted by Fasces

To the best of my knowledge, there are differences in programming between ZF-6 trucks and automatic transmission on where vehicle speed is monitored. My truck is a stick shift and the only vehicle speed sensor is on the rear axle. I may be incorrect on this, but I think there is a chance that an automatic transmission truck gets its vehicle speed information from something in the transmission. Again, don't quote me on this.