SENSOR PROBLEM CODES U1110 AND U1120

  • Tiny
  • kevi1968
  • 2008 Dodge Truck
  • 68,000 miles

I have an 2008 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 idiot lights?

Wednesday, March 14th, 2012 AT 12:43 AM

5 Answers

  • Tiny
  • ASEMaster6371
  • Expert
  • 25,502 posts

There is a sensor on top of the differental. It is the most common failure for the speedo and abs light. Otherwise, you need a shop to trace the wiring to determine the failure.

Roy

Was this
answer
helpful?
Yes
No
Wednesday, March 14th, 2012 AT 12:48 AM
  • Tiny
  • kevi1968
  • Member

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.

Was this
answer
helpful?
Yes
No
Wednesday, March 14th, 2012 AT 12:58 AM
  • Tiny
  • ASEMaster6371
  • Expert
  • 25,502 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

Was this
answer
helpful?
Yes
No
Wednesday, March 14th, 2012 AT 5:32 PM
  • Tiny
  • kevi1968
  • Member

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!

Was this
answer
helpful?
Yes
No
Thursday, March 15th, 2012 AT 12:46 AM
  • Tiny
  • rivermikerat
  • Expert
  • 6,118 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.

Was this
answer
helpful?
Yes
No
Saturday, March 24th, 2012 AT 7:53 PM

Please login or register to post a reply.