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Old 02-06-2019, 12:36 PM
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2016 JKU codes C1044, C1035, U140C

I have been having intermittent ABS and traction control lights coming on.
It only seems to happen after the jeep has been sitting for a while. When I first get in and back up and pull forward the lights turn on and into limp mode. If I keep driving lights go off and have no problems again until the jeep sits.

I checked for codes and have 3 codes. (U140C, C1035, C1044)
C1044 right rear tone wheel performance
C1035 right rear wheel speed comparative performance
U140C implausible right rear wheel speed signal received

My question is it a bad speed sensor or something else? I would think if it was a bad speed sensor it would do it at all turns from traffic lights.
How difficult is it to replace the rear speed sensor? What brand is the best?What else could it be? I have not been off road so I don't think the sensor is dirty.
Thanks for any ideas.

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Old 02-06-2019, 06:14 PM   #2
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When is the last time you did a rear brake job? Sound like the electronics are working properly by the faults you are getting, it just doesn't like the signal it's getting. If you get the circuit fault, then you are looking at the sensor or wiring.

Pull both wheels, remove calipers, remove rotors. Clean up the tone rings, looks like a metal wheel with notches all the way around, sensor sits very close to it, spray down with cleaner (brake cleaner eats asphalt so use a catch bucket) and use a brush to clean in the notches. Inspect your rear axles seal, clean and lube your parking brake components. Take rough grit sand paper(sanding block works best) scuff your rotor surface on both sides, sand rust out of parking brake surface on interior of rotor (may be a lot, messy) clean rotor, remove caliper slides and clean and lube, adjust parking brake until slight resistance is felt in rotor when you spin it. Look at what is rusting excessively, put it on your list to replace next time, put everything back together, torque nuts and go for a test drive.

I take the time to do this at least once a year, ideally I do it twice, spring and fall. Try removing your rotors after three years of rust and wear has trapped the parking brake pads in the rotor and you can't turn the adjuster.

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Old 02-06-2019, 06:23 PM   #3
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Addendum. The tone rings rust and if you get a chunk of rust riding around the ring, it can screw witht the signal. Sensor aren't too difficult, they can be a pain to get in and out. Easier to see and do everything when apart. Try the cleaning first and make it part of your annual routine, it will save you money in the long run because brakes are probably the second easiest thing to do yourself after an oil change. If after the cleaning, the fault still persists, then change sensor.

I got the circuit fault and then it would go away, but the ABS never worked properly and when they had to, the ABS light would come on. After I was done, I took the sensor apart and there is some 'frikin weird magic going on in it.
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Old 02-07-2019, 08:19 AM
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Thanks for your help. It is just strange that it is not all the time. It has been fine the last 2 days. It is usually only after the jeep sits for a while. I am on my original battery and wonder if it could be causing some strange electrical problem? I have not replaces brakes yet either. Mostly drive it as my daily driver.
Edit
Just went to lunch and had the traction light and ABS light come on and went into limp mode. I drove straight for about 50 yards and lights went out and power came back to the engine.
Very strange how intermittent this is??
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Old 02-08-2019, 07:57 PM
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Replaced the sensor tonight will see if that fixes it. I did brake the red tab on the connector. Fix one thing brake something else. Will not having the lock on the connector be a problem?
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Old 02-09-2019, 09:00 AM   #6
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I broke mine too, can't remember exactly how but I tie wrapped it so it couldn't come off.
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Old 09-12-2019, 11:40 AM   #7
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Originally Posted by tapper25 View Post
Replaced the sensor tonight will see if that fixes it. I did brake the red tab on the connector. Fix one thing brake something else. Will not having the lock on the connector be a problem?
Did replacing the sensor fix the issue?
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Old 09-12-2019, 01:47 PM
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Did replacing the sensor fix the issue?
Yes. I purchased a sensor from amazon and problem was gone. I did beak the red clip but it stays together fine so far. I even had to replace the other rear side a couple of weeks ago.
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Old 09-12-2019, 02:57 PM   #9
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Yes. I purchased a sensor from amazon and problem was gone. I did beak the red clip but it stays together fine so far. I even had to replace the other rear side a couple of weeks ago.
Got it thanks for the update... I have similar issue with my rear wheel speed sensor and for some reason they (rear) cost over hundred bucks and for Sensor ONLY, does NOT have a pigtail. The front one is about 20 bucks and comes with a pigtail.. Not sure why such dramatic price difference…

Mopar 52125003AB Rear Wheel Speed Sensor Kit - https://www.quadratec.com/products/56207_1049.htm

Mopar 68003281AD Front Wheel Speed Sensor Kit - https://www.quadratec.com/products/56207_1039.htm
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Old 09-13-2019, 09:21 AM
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Got it thanks for the update... I have similar issue with my rear wheel speed sensor and for some reason they (rear) cost over hundred bucks and for Sensor ONLY, does NOT have a pigtail. The front one is about 20 bucks and comes with a pigtail.. Not sure why such dramatic price difference…

Mopar 52125003AB Rear Wheel Speed Sensor Kit - https://www.quadratec.com/products/56207_1049.htm

Mopar 68003281AD Front Wheel Speed Sensor Kit - https://www.quadratec.com/products/56207_1039.htm
This is the one I used from Amazon https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
I

It is only 11.00 and is still working fine. You do not need any wires. You can just unplug the sensor and plug in the new one.
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Old 09-13-2019, 11:27 AM   #11
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This is the one I used from Amazon https://www.amazon.com/gp/product/B0...?ie=UTF8&psc=1
I

It is only 11.00 and is still working fine. You do not need any wires. You can just unplug the sensor and plug in the new one.
Thanks for the answer... I have already purchased Crown Automotive 52125003AB Rear Wheel Speed Sensor from Quadratec:
https://www.quadratec.com/products/55200_0122.htm

Thanks again and have a safe and great weekend!

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