Cruise control errors

[Fox W.]

Hi all,

 

Sorry if this overlaps with any previous threads.  Recently my car started throwing cruise errors.  I fear it could be electrical as I couldn't find anything wrong with the module/linkage/vacuum hoses. 

 

It started by constantly flipping between error state and OK over and over, nagging very often on the CRT.   Then eventually it just became consistently in error state.  

 

I found an old thread saying there can be a wire in the steering column that can get its insulation rubbed off and short to ground.  Is that common?  

[Barney Eaton]

Common......No

However we are driving cars that are 30+ years old and gremlins creep in from time to time.  

Since you have checked several things,  try unplugging and re-plug the connectors for the cruise. 

Cars have extremes of heat and cold,  high and low humidity,  vibration and dust.   All of these can contribute

to connectors loosing their connection/contact.    A little contact cleaner or just WD-40 will not hurt. 
 

[padgett]

Knowing which code would help, can reach "error codes" under the ECM in diagnostics.

[Fox W.]

Thanks I'll get the code, sorry about that.  I did try unplugging and plugging back in the cruise assembly under the hood as well as checking connectors.   Also I should have mentioned this happens before the car is even running, error is even just while ON (not start)

[Fox W.]

No ECM codes, it's BCM:   B671  ; current and persistent.   I guess that is the servo position error.. bad coil ?    I wonder if I should just replace or attempt repair.

Edited November 14, 2022 by Fox W. (see edit history)

[DAVES89]

I'd replace the servo. Must be millions of them in a salvage yard. get two they're cheap, try them both and this way you have a spare.

[Fox W.]

With a new servo the problem is fixed.   Thanks all.

[Larry Schramm]

If the cruise just drops out, I would change the brake switch.  Known problem in that era of vehicles.  Cheap possible fix.

 

https://www.autozone.com/electrical-and-lighting/stoplight-switch/p/acdelco-stoplight-switch-12450036/617744_0_0?cmpid=LIA:US:EN:AD:NL:1000000:IGN:8366887415&gclid=Cj0KCQiA4OybBhCzARIsAIcfn9nliw6TnJAEnCKlrr86kqJ-OHBSxaWhzLoEeCWIOYMMziT1zc-MSW8aAq7XEALw_wcB&gclsrc=aw.ds

Edited November 21, 2022 by Larry Schramm (see edit history)