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Loss of all forward gears, but still has reverse

Tiny
K.M.S
  • MEMBER
  • 2004 FORD F-150
  • 5.4L
  • V8
  • 4WD
  • AUTOMATIC
  • 186,000 MILES
Hi, so I pulled up to a stop yesterday afternoon and when I tried to pull away I had no forward gears only reverse. I backed it the half mile back home, had no issues with reverse. I pulled the codes and got P0720 output speed sensor insufficient input or circuit malfunction. If this sensor or its wiring is failing/failed, would it cause the loss of forward gears? Any ideas on what it might be if it is not the sensor? Thanks!
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Tuesday, October 31st, 2017 AT 7:28 AM

1 Reply

Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 108,217 POSTS
You are correct regarding the code's meaning. But, the result of issues with the output speed sensor usually does not make the vehicle unable to be driven. I have seen such issues as misfires, inability to shift, inoperative speedometer. However, that does not mean your situation is not different. Since that it the code you got, I would recommend starting there. Before replacing the sensor, make sure to check simple things such as shift linkage, transmission fluid level and condition.
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Tuesday, March 23rd, 2021 AT 11:04 AM

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