Code P0720

[justinspencer71]

Ok i just bought my 2000 Expy and am already having problems...it is turning off Overdrive by itself, speedometer is bouncing all over the place...intermetintally, shifting really hard, and cruise control is not working when it is acting up. Code is coming up as P0720, Output Shaft Speed sensor but gives a bunch of options on a fix, any ideas would help.

 

[Bedrck47]

DTC
P0720 - Insufficient input from Output Shaft Speed sensor

Description
The output shaft speed sensor inputs a signal to the PCM, based on the speed of the output shaft of the transmission. The PCM compares this signal with the signal of the VSS or TCSS and determines correct tire size and axle gear ratio.

Possible Causes
OSS sensor circuit short to GND
OSS sensor circuit short to PWR
OSS sensor circuit open
Damaged OSS sensor
Damaged PCM

Diagnostic Aides
Verify sensor signal output varies with vehicle speed.