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Home >> Jeep >> 2010 >> Liberty Limited, 4WD, Part Time >> Repair and Diagnosis >> Transmission >> Automatic Trans >> Powertrain Control Module (Pcm) - Electrical Diagnostics - 42RLE Automatic Transmission >> DTC Troubleshooting >> P0721-Output Speed Sensor Circuit Performance >> Possible Causes
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Possible Causes

Possible Causes 
(T14) OUTPUT SPEED SIGNAL CIRCUIT OPEN
(T13) SENSOR GROUND CIRCUIT OPEN
(T14) OUTPUT SPEED SIGNAL CIRCUIT SHORT TO GROUND
(T14) OUTPUT SPEED SIGNAL CIRCUIT SHORT TO VOLTAGE
(T13) SENSOR GROUND CIRCUIT SHORT TO VOLTAGE
OUTPUT SPEED SENSOR
POWERTRAIN CONTROL MODULE

Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. See  DTC-Based Diagnostics/MODULE, Powertrain Control (PCM) - Standard Procedure