Code
P0720
Transmission
Output shaft speed sensor circuit malfunction
The transmission cannot measure output speed, so shifting is compromised.
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Most likely causes
- Faulty output speed sensor
- Wiring fault
- Damaged tone ring
Symptoms you may notice
- Erratic shifting
- Speedometer faults
- Limp mode
Checks to run
- Test sensor signal
- Inspect wiring
- Check tone ring
Tools you may need
Multimeter
Oscilloscope
Always diagnose before replacing. Codes share symptoms; confirm the cause with measurements before buying parts.