Engine light comes on problem code is U1120 - 2005 Dodge Durango

Lizzie, U1120 means the PCM doesn't receive a vehicle speed signal from the Anti-lock brake Module over the CAN C bus. You may have to have a good tech. diagnose and estimate repair. Check the attached links,instruction and guides, Good luck
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Error Code U1110 and U1120 Chrysler Forum Chrysler Enthusiast Forums
HELP Codes U1120 U0121

You can enter the code in your search engines to find out what they mean

U1120 means the abs module has lost communication with speed sensors. You'll need a scanner to monitor speed sensors. If problem is in module you won't get communication with scanner. Follow your brake lines from master cylinder to ABS pump/module, on the side of in is a wired connector. Undo it and check for moisture or corrosion. Get some dielectric gel and smear it good on all contacts. And plug back in and retest. Might need new module or speed sensor

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U1120 The code U1120 means, lost wheel distance message. The powertrain control module(PCM) is not
receiving a signal from the anti-lock brake module. The problem could be a short in the bus circuit,
the PCM or the anti-lock brake module. This type of problem is best diagnosed by the dealer or a
local shop with the proper diagnostic scanning equipment. Hope this helps.

Time to get it into the dealer, unless you have the proper equipment to diagnose the problem. I won't mess with anything electrical on any vehicle.

My 07 dodge charger brake light,abs, esp, bas light on an check engine light on an the hand show u how fast u going don’t work I took it to auto zone an they run a check on it an the code showed up u1120 an u1121i replace the rear brake sensors an drove it around the corner but the lights are still on.

Good Evening, the u1120 is a dealer specific code and like the calibers and such it is a lost wheel distance code. Hope that helps.
Thanks,
Joey

Most likely problem is a split trasmission sump filter.

PO-1120 Throttle Position Sensor Out Of Range

Why would you go to Auto Zone and come away without knowing what the code was?
For $50.00, you can get the least expensive code reader.

LOST WHEEL DISTANCE MESSAGE