Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSJEEP2009WRANGLER RUBICON, STANDARDREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT VARIANT/TRIMSECTION 4 ((TRANSMISSION CONTROL MODULE (TCM) - ELECTRICAL DIAGNOSTICS))DTC TROUBLESHOOTINGP0721-OUTPUT SPEED SENSOR CIRCUIT PERFORMANCEPOSSIBLE CAUSES
2009 Jeep Wrangler Rubicon, Standard
Possible Causes
2009 Jeep Wrangler Rubicon, StandardSECTION Possible Causes
WARNING: This page is about a different variant/trim than selected.
| Possible Causes |
|---|
| (T14) OUTPUT SPEED SENSOR SIGNAL CIRCUIT OPEN |
| (T13) SPEED SENSOR GROUND CIRCUIT OPEN |
| (T14) OUTPUT SPEED SENSOR SIGNAL CIRCUIT SHORTED TO GROUND |
| (T13) SPEED SENSOR GROUND CIRCUIT SHORTED TO GROUND |
| (T14) OUTPUT SPEED SENSOR SIGNAL CIRCUIT SHORTED TO VOLTAGE |
| (T13) SPEED SENSOR GROUND CIRCUIT SHORTED TO VOLTAGE |
| OUTPUT SPEED SENSOR |
| POWERTRAIN CONTROL MODULE (PCM) |
Always perform the Pre-Diagnostic Troubleshooting Procedure before proceeding. See DTC-Based Diagnostics/MODULE, Transmission Control (TCM) - Standard Procedure .
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.