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The Service 4WD light is coming on periodically. Would that have anything at all to do with CV joint or wheel bearing?The Service 4WD light is coming on periodically. Would that have anything at all to do with CV joint or wheel bearing?
AnonymousMar 24, 2014
whinning and humming.gets worse the faster you gowhinning and humming.gets worse the faster you go
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Hi there: That flashing is a signal from the GEM computer that indicates a
failure in the Control-Trac system. Typically it is one of the
Hall-effect axle speed sensors (located in the t-case) that has failed.
In the auto position on your model the system monitors relative front
and rear axle speeds, increasing the period of engagement of the clutch
pack in the transfer case to eliminate the rear moving faster than the
front. If it gets to full-lock, for example, and the rear still seems
to be turning faster then it reverts the system to 4WD (locks the
transfer case in 4wd as it does in 4wd-lo) and flashes the lights to
tell you of the problem (in 97 and later models it reverts to 2WD in
the default, auto position). Some have reported cleaning the contacts on
the speed sensors has helped, but you may want to get to a dealer if
the problem persists. Watch that they dont automatically try to
replace the computer or the transfer case. Usually it is just a sensor
problem, which is relatively easy and inexpensive to replace. There is
a shift motor on the t-case on these models, but it is only used to
select 4wd-lo and yours seems to do that OK.
Hope this helps; also keep in mind that your feedback
is important and
I`ll appreciate your time and consideration if you leave some
testimonial comment about this answer.
Hi there: That flashing is a signal from the GEM computer that indicates a
failure in the Control-Trac system. Typically it is one of the
Hall-effect axle speed sensors (located in the t-case) that has failed.
In the auto position on your model the system monitors relative front
and rear axle speeds, increasing the period of engagement of the clutch
pack in the transfer case to eliminate the rear moving faster than the
front. If it gets to full-lock, for example, and the rear still seems
to be turning faster then it reverts the system to 4WD (locks the
transfer case in 4wd as it does in 4wd-lo) and flashes the lights to
tell you of the problem (in 97 and later models it reverts to 2WD in
the default, auto position). Some have reported cleaning the contacts on
the speed sensors has helped, but you may want to get to a dealer if
the problem persists. Watch that they dont automatically try to
replace the computer or the transfer case. Usually it is just a sensor
problem, which is relatively easy and inexpensive to replace. There is
a shift motor on the t-case on these models, but it is only used to
select 4wd-lo and yours seems to do that OK.
Hope this helps; also keep in mind that your feedback
is important and
I`ll appreciate your time and consideration if you leave some
testimonial comment about this answer.
check the tires sometime if the tires are choppy they will make a lot of noise.if they are try swapping a rear tire to the front and see if the sound moves location.
Rather than guess witch one it is( sounds to me to be a wheel bearing or hub bearing) just chg. out both, but if it gets louder when you make a right turn i would say its the left side sense when you make a right turn you are putting more forse and weight on that side.
Most likely it's a wheel bearing going out.., If you turn to the right, or the left when driving the noise will change pitch. Been there done that.....
The Service 4WD light is coming on periodically. Would that have anything at all to do with CV joint or wheel bearing?
whinning and humming.gets worse the faster you go
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