P0721
Powertrain Codes
P0721 - FORD - Output Speed Sensor Noise Interference
Symptoms
- Engine Light ON (or Service Engine Soon Warning Light) - Speedometer improper reading - Possible shifting problems
Possible Causes
- Speed sensor harness or connectors - Sensor circuit is open or shorted - Speed sensor
When Detected
Vehicle speed sensor above 1 MPH and the ECM detected noise interference from the output speed sensor
Description
The speed sensor detects the revolution of the idler gear parking pawl lock gear and emits a pulse signal. The pulse signal is sent to the Transmission Control Module (TCM) which converts it into vehicle speed.