P0721 - Output Speed Sensor Range/Performance

Output speed sensor signal is outside expected range.

Code Overview

Output speed sensor signal is outside expected range.

Common Causes

• Faulty output speed sensor
• Wiring issue
• Low or dirty transmission fluid
• Internal transmission issue

Diagnostic Steps

1. Inspect sensor connector and wiring
2. Check fluid level and condition
3. Monitor output speed on scan tool
4. Look for related gear ratio codes

Likely Repairs & Cost Guides

Use test results to confirm the fault before pricing the repair.

Related OBD Codes

Browse the closest code-family pages when the same fault pattern often shows up nearby.

Next Steps

Move from the code to a diagnosis path, then into repair pricing once the fault is confirmed.