DTC Troubleshooting: P0721
DTC P0721: Output Shaft (Countershaft) Speed Sensor (Range/Performance)
NOTE:
Before you troubleshoot, review the General Troubleshooting Information.
This code is caused by an electrical circuit problem and cannot be caused by a mechanical problem in the transmission.

DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
P0721 Output Shaft (Countershaft) Speed Sensor (Range/Performance)
      

1.
DTC check:

DTC check
?1.
Turn the vehicle to the ON mode.

?2.
Clear the DTC with the HDS.


?3.
Raise the vehicle on a lift. Make sure it is securely supported, and allow all four wheels to rotate freely.

?4.
Start the engine.

?5.
Disable the VSA by pressing the VSA OFF button.

NOTE: Enter the VSA maintenance mode in case of the vehicle speed above 31 mph (50 km/h).

?6.
Test-drive the vehicle in D position/mode, and keep the vehicle speed at speeds over 12 mph (20 km/h) for at least 10 seconds. Slow down, and stop the wheels.

?7.
Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
P0723 Output Shaft (Countershaft) Speed Sensor (Intermittent Failure)
      

Is DTC P0723 indicated?

     
YES
     
     
     
     
NO
     
     
     
Go to step 2.
2.
Problem verification:

Problem verification
?1.
Check for Pending or Confirmed DTCs with the HDS.
DTC Description
Confirmed DTC
Pending DTC
Freeze Frame
P0721 Output Shaft (Countershaft) Speed Sensor (Range/Performance)
      

Is DTC P0721 indicated?

     
YES
     
     
     
The failure is duplicated. Go to step 3.
     
NO
     
     
     
Intermittent failure, the system is OK at this time. Check for poor connections and loose terminals between the output shaft (countershaft) speed sensor and the PCM. If the freeze data/on-board snapshot of this DTC is recorded, try to reproduce the failure under the same conditions with the freeze data/on-board snapshot.?
3.
Output shaft (countershaft) speed sensor connection check:

Output shaft (countershaft) speed sensor connection check
?1.
Check the output shaft (countershaft) speed sensor for poor connection and proper installation.

Are the connection and installation OK?

     
YES
     
     
     
The connection and installation are OK. Replace the output shaft (countershaft) speed sensor.?
     
NO
     
     
     
Repair faulty connection or installation.?