P0720
System
Powertrain (Transmission)
Scanner required
Full-system scanner (engine, ABS, SRS, transmission, service resets)

Output Speed Sensor Circuit

Understand P0720, common causes, and the right TOPDON scanner to diagnose it.

Output shaft speed sensor fault. Often causes erratic shifting and may store P0700 as parent code.

Common symptoms

  • Flare on shifts
  • ABS light (shared sensor on some cars)
  • Limp mode

Typical causes

  • Failed OSS sensor
  • Wiring damage
  • Metal debris on sensor tip

What scanner do you need?

Full-system scanner (engine, ABS, SRS, transmission, service resets)

Use live data and freeze frame to confirm the fault before replacing parts. ABS, SRS, and network U-codes usually require a full-system scanner.

Diagnostic tips

  • Record freeze frame data when the code first sets
  • Clear the code only after fixing the root cause
  • Check for related pending codes that point to a common issue
  • Verify battery voltage is above 12.4V before chasing sensor codes

Recommended TOPDON scanners

Frequently asked questions

Can I diagnose P0720 with a basic code reader?
P0720 may set in the engine module, but related diagnostics often benefit from an enhanced or full-system scanner with live data and freeze frame.
Is it safe to drive with P0720?
It depends on the code and symptoms. Flashing check engine lights and misfire codes should be addressed immediately. Consult a professional if unsure.