P0721 - Output Speed Sensor Range/Performance

Output speed sensor signal is outside expected range.

Code first. Confirm symptoms and checks before pricing parts.

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

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Related OBD Codes

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Next Steps

Move from code to checks, then estimate.