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P0721 - Output Shaft Speed (OSS) Sensor Circuit Range/Performance

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P0721 - OUTPUT SHAFT SPEED (OSS) SENSOR CIRCUIT RANGE/PERFORMANCE

Description:  This DTC sets when the OSS sensor signal input exceeds the calibrated threshold or has excessive electrical noise. The OSS signal is very sensitive to electrical noise. This electrical noise distorts the OSS input to the PCM.
Possible Causes: 
  • Incorrect OSS wiring harness routing
  • Aftermarket add-on
  • OSS wiring damaged
  • OSS wiring insulation wear
Diagnostic Aids:  Check the routing of the OSS wiring harness.
Check the OSS wiring and the OSS connector for damage.
Application  Key On Engine Off  Key On Engine Running  Continuous Memory 
Manual Transmission GO to PINPOINT TEST DP: OUTPUT SHAFT SPEED (OSS) SENSOR/VEHICLE SPEED SENSOR (VSS) .
Automatic Transmission Refer to the Automatic Transmission, Diagnostic Trouble Code (DTC) Index to continue diagnosis.
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