Loss of all forward gears, but still has reverse

2004 FORD F-150
186,000 MILES • 5.4L • V8 • 4WD • AUTOMATIC
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K.M.S
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  • 2 POSTS
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!
Oct 31, 2017 at 7:28 AM
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JACOBANDNICKOLAS
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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.
Mar 23, 2021 at 11:04 AM