So, I’m at my wits end. I may be making irrational decisions.
A few weeks ago my 2014 JKUR at about 162k miles suddenly started sounding a chime and flashing a bunch of warning lights while driving on twisty mountain roads. It would cut power, the Speedo would fall toward zero, and various lights, including ABS, Brake, Traction Control, Sway Bar, etc… would flash. Everything instantly returns to normal with no loss of speed or shifts or anything else. It repeated on 1-10 minute intervals for 80 miles on the way home. Stressful drive.
After a couple of key cycles it would go away and not return for days or weeks. Codes were mostly in the ABS module and included Battery Voltage High, Brake switch stuck on 50%, Brake circuit 1 performance.
I verified correct tire pressures, gear ratio, wheel speed sensors all report and match, and steering is centered.
The problem has gotten progressively worse to the point of almost undriveability. I’m sticking close to work now. There are still random runs of 30-50 miles with no issues, but more likely is 2-3 miles until it starts up and then lucky to make it 1 miles between issues. 1/2 mile is more likely.
While scanning and watching data, I realized that the ABS module thinks its supply voltage is randomly fluctuating from 12.6-15.7 volts several times per minute, no pattern, just all over the map. So I thought maybe a bad voltage regulator at the alternator, but that output is rock steady at 13.79 V. I also replaced the brake switch because it was $18 and seemed like easy troubleshooting. It was sticking, but not the cause of the issue.
Interestingly, when the speedo drops, the PCM sees Vehicle Speed go to zero for a fraction of a second, but all of the other things that report vehicle speed (all wheel sensors and transmission control) don’t see the fluctuation.
So, most of the internet troubleshooting seems to say “Swap the ABS module and life will get better”…
But….
Jeep discontinued the module for the early 2014 builds and the late 2014 (theoretically different) are backordered since 2019. I found one that claims to match on Amazon for $800. Ouch! There is a place called Module Master in Idaho that claims they can rebuild? I haven’t called them yet.
I turned off the ECS with JScan, but the problem is still happening, just no chime, so much less annoying. All driving and shifting functions are still fine. I tried unplugging the Module, that doesn’t work, because you can’t shift out of first, even though you can drive.
Has anyone else dealt with similar? What did you do? These modules seem to have gone into dozens of car makes and models. Could we really be left high and dry by multiple manufacturers after less than 10 years?
A few weeks ago my 2014 JKUR at about 162k miles suddenly started sounding a chime and flashing a bunch of warning lights while driving on twisty mountain roads. It would cut power, the Speedo would fall toward zero, and various lights, including ABS, Brake, Traction Control, Sway Bar, etc… would flash. Everything instantly returns to normal with no loss of speed or shifts or anything else. It repeated on 1-10 minute intervals for 80 miles on the way home. Stressful drive.
After a couple of key cycles it would go away and not return for days or weeks. Codes were mostly in the ABS module and included Battery Voltage High, Brake switch stuck on 50%, Brake circuit 1 performance.
I verified correct tire pressures, gear ratio, wheel speed sensors all report and match, and steering is centered.
The problem has gotten progressively worse to the point of almost undriveability. I’m sticking close to work now. There are still random runs of 30-50 miles with no issues, but more likely is 2-3 miles until it starts up and then lucky to make it 1 miles between issues. 1/2 mile is more likely.
While scanning and watching data, I realized that the ABS module thinks its supply voltage is randomly fluctuating from 12.6-15.7 volts several times per minute, no pattern, just all over the map. So I thought maybe a bad voltage regulator at the alternator, but that output is rock steady at 13.79 V. I also replaced the brake switch because it was $18 and seemed like easy troubleshooting. It was sticking, but not the cause of the issue.
Interestingly, when the speedo drops, the PCM sees Vehicle Speed go to zero for a fraction of a second, but all of the other things that report vehicle speed (all wheel sensors and transmission control) don’t see the fluctuation.
So, most of the internet troubleshooting seems to say “Swap the ABS module and life will get better”…
But….
Jeep discontinued the module for the early 2014 builds and the late 2014 (theoretically different) are backordered since 2019. I found one that claims to match on Amazon for $800. Ouch! There is a place called Module Master in Idaho that claims they can rebuild? I haven’t called them yet.
I turned off the ECS with JScan, but the problem is still happening, just no chime, so much less annoying. All driving and shifting functions are still fine. I tried unplugging the Module, that doesn’t work, because you can’t shift out of first, even though you can drive.
Has anyone else dealt with similar? What did you do? These modules seem to have gone into dozens of car makes and models. Could we really be left high and dry by multiple manufacturers after less than 10 years?
