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Sensor problem codes U1110 and U1120

Tiny
KEVI1968
  • MEMBER
  • 2008 DODGE TRUCK
  • 68,000 MILES
I have an Ram 1500 4.7 crew cab 4x4. I have a lit ABS light, parking brake light, no speedometer or odometer. I believe it to be one of the speed sensors, but which one?

It has two in the transmission, and one on each wheel. I recently put in larger tires, new rims, and the shop added a spacer. I changed the rear brake pads, and one of the front hub bearings.

None of those changes caused the lights to come on, they just did on a regular highway trip to pay the electric bill.

What part do I need to replace, and how can I turn off the warning lights?
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Wednesday, March 14th, 2012 AT 12:43 AM

5 Replies

Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
There is a sensor on top of the differential. It is the most common failure for the speedometer and ABS light. Otherwise, you need a shop to trace the wiring to determine the failure.

Roy
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Wednesday, March 14th, 2012 AT 12:48 AM
Tiny
KEVI1968
  • MEMBER
  • 3 POSTS
No the 2008 does not have a sensor on top of the differential.
It has the speed sensors on both of the rear wheels instead.
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Wednesday, March 14th, 2012 AT 12:58 AM
Tiny
ASEMASTER6371
  • MECHANIC
  • 52,797 POSTS
Okay, do this test which will identify the bad sensor by checking the voltages produced, you should also ohm out the harness and look for connection issues.

https://www.2carpros.com/articles/abs-wheel-speed-sensor-test

Roy
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Wednesday, March 14th, 2012 AT 5:32 PM
Tiny
KEVI1968
  • MEMBER
  • 3 POSTS
I found the problem it was the right rear sensor had no voltage output so I replaced it and the light went out. I will use 2CarPros in the future and tell my friends. Thanks again!
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Thursday, March 15th, 2012 AT 12:46 AM
Tiny
RIVERMIKERAT
  • MECHANIC
  • 6,110 POSTS
I wanted to add this information in case anyone needed it.

U1110 means lost wheel speed message.
U1120 means lost wheel distance message.

Refer to these drawings for more info on where to look.
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Saturday, March 24th, 2012 AT 7:53 PM

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