OBD Codes U1110 and U1120

ERIC ZEOLLA

MEMBER
2012 JEEP LIBERTY
3.7L
6 CYL
4WD
AUTOMATIC
80,000 MILES

Warning lights came on for ABS/brake/stability control/etc and the speedometer stopped working. I knew the battery was nearing the end of its life so I replaced it thinking maybe it dying was causing havoc on the electrical systems. Did not fix problem. Now showing error codes U1110 and U1120. Going to test the wheel speed sensors tonight to rule them out. Not sure where to go after that.

3 Replies

HMAC300

MECHANIC
48,601 POSTS

The problem is the same for both of them and it is a can/bus problem where one module is not talking to another. It is best for a mechanic to run his scanner on it to see which module is the problem or if it is a shorted wire/bent pin.

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Tuesday, June 27th, 2017 AT 12:18 PM

ERIC ZEOLLA

MEMBER
2 POSTS

Thanks for your reply. I will take it to have a professional look at it. In the mean time, is it okay to drive? Obviously no ABS and stability control (and cruise control), but other than that, do I have to worry about it not starting or something going haywire while on the highway?

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Tuesday, June 27th, 2017 AT 12:54 PM

STEVE W.

MECHANIC
13,414 POSTS

Could more failures shut down the vehicle? Yes. Will there be more failures?
What a tech will do is connect a good scan tool and run a powertrain verification test. That will attempt to talk to each module on both control bus types and see which one(s) don't answer. Then they will see if it's the wiring, power or? That is causing that module to have a problem.

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Tuesday, June 27th, 2017 AT 1:50 PM