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Four wheel drive will not engage, code U140D

Tiny
SZALAY
  • MEMBER
  • 2013 RAM 3500
  • 6.7L
  • 6 CYL
  • TURBO
  • 4WD
  • AUTOMATIC
  • 136,000 MILES
ABS and traction control lights on, truck was stuck in Four wheel drive low and I got it to come out after much switching and back and forth driving. I am now getting a U140D code and service Four wheel drive and Four wheel drive temporarily unavailable. Truck will not shift out of two wheel drive.
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Friday, April 6th, 2018 AT 2:36 PM

3 Replies

Tiny
STEVE W.
  • MECHANIC
  • 13,573 POSTS
U140D - Implausible wheel speed signals received. Most common reason is broken wiring or a bad connection in the wiring to the wheel speed sensors. Finding which one will take a scan tool to watch the way each sensor responds and reports the speed the truck is going. The loss of the signal from any of the wheel sensors will kick the traction control and the ABS off as both use the signals for control.
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Sunday, April 8th, 2018 AT 4:12 PM
Tiny
SZALAY
  • MEMBER
  • 3 POSTS
Steve, you are correct, it was a broken wire on passenger side front ABS sensor. Just fixed it. Thank you for your input.
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Tuesday, April 10th, 2018 AT 1:24 PM
Tiny
STEVE W.
  • MECHANIC
  • 13,573 POSTS
You are welcome. Glad to hear you found and repaired it.
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Tuesday, April 10th, 2018 AT 8:35 PM

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