When diagnosing a RAM Code P0721, it is essential to understand the function of the output speed sensor. This sensor is responsible for monitoring the rotation of the output shaft, which, in turn, affects the gear ratio. When this sensor detects abnormalities, it triggers a fault code sent to the transmission control module (TCM). Understanding the causes of the RAM Code P0721 is vital to finding the right solution.
💥See also: RAM Code P226C
Causes and Solutions of RAM Code P0721
| Cause | Solution |
|---|---|
| Output Speed Sensor Supply (+) Circuit Shorted to Ground | Replace the output speed sensor or check the wiring for a short circuit. |
| Output Speed Sensor Supply (+) Circuit Open | Check the wiring for open circuits or replace the output speed sensor. |
| Output Speed Sensor Supply (+) Circuit Shorted to Another Circuit | Check the wiring for a short circuit or replace the output speed sensor. |
| Output Speed Sensor Supply (+) Circuit Shorted to Battery Voltage | Check the wiring for a short circuit or replace the output speed sensor. |
When dealing with RAM Code P0721, it is essential to understand the output speed sensor’s function and the fault code’s causes. The output speed sensor is responsible for monitoring the rotation of the output shaft, which, in turn, affects the gear ratio. The sensor will trigger a fault code to be sent to the transmission control module (TCM) when abnormalities are detected. Common causes of RAM Code P0721 include short circuits, open circuits, or faulty output speed sensors. Finding the right solution to the RAM Code P0721 requires identifying the underlying cause. Solutions may include replacing the output speed sensor, checking the wiring for shorts or opens, or replacing the output speed sensor.
Output Speed Sensor Supply (+) Circuit Shorted to Ground
When the output speed sensor supply (+) circuit is shorted to ground, the output speed sensor cannot accurately measure the output shaft’s rotation. This will cause the transmission control module to display RAM Code P0721. To resolve this issue, the output speed sensor needs to be replaced, or the wiring needs to be checked for a short circuit.
Output Speed Sensor Supply (+) Circuit Open
An open circuit in the output speed sensor supply (+) circuit will cause the output speed sensor to be unable to measure the rotation of the output shaft. This will result in RAM Code P0721 being triggered. To fix the issue, either the wiring must be checked for open circuits or the output speed sensor must be replaced.
Output Speed Sensor Supply (+) Circuit Shorted to Another Circuit
When the output speed sensor supply (+) circuit is shorted to another course, the output speed sensor cannot accurately measure the output shaft’s rotation. This will cause RAM Code P0721 to be triggered. To fix the issue, the wiring must be checked for a short circuit, or the output speed sensor must be replaced.
Output Speed Sensor Supply (+) Circuit Shorted to Battery Voltage
If the output speed sensor supply (+) circuit is shorted to battery voltage, the output speed sensor will not be able to measure the rotation of the output shaft correctly. This will cause the transmission control module to display RAM Code P0721. To resolve the issue, the wiring must be checked for a short circuit, or the output speed sensor must be replaced.
Conclusion
The RAM Code P0721 indicates that the output speed sensor is malfunctioning. It is essential to identify the underlying cause to find the solution to this issue. Common causes of RAM Code P0721 include open circuits, short circuits, and a faulty output speed sensor. Solutions may include replacing the output speed sensor, checking the wiring for shorts or opens, or replacing the output speed sensor. As a result, it is crucial to understand the function and causes of the RAM Code P0721 to find the right solution.