Causes and Fixes P0721 Code: Output Speed Sensor Circuit Range/Performance
How to fix a P0721 Code: Output Speed Sensor Circuit Range/Performance
A P0721 code is set when the computer (TCM/ECM/PCM) detects a problem with the transmission output shaft sensor (OSS).
Automatic transmissions use the output shaft sensor (OSS) for information about the transmission input and output shaft rotation to properly control the shift solenoids.
Common causes for the P0721 code include a defective output speed sensor, wiring, defective shift solenoids, and a defective transmission valve body.
The OSS is usually located at the end of the output shaft and directly before the drive axles to obtain measurements of the shaft’s speed.
Possible Causes of a P0721 Code:
Low or Dirty Transmission Fluid
Bad Output Shaft Speed Sensor
Wiring (Open/Short)
Internal Transmission Failure
Malfunctioning Computer (TCM/PCM)
By using this information user assumes all risk of use.
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