P0720: Output Speed Sensor Circuit Malfunction
The transmission isn't getting a usable output speed signal.
Green, yellow, red: three ways P0720 can look
The same code can be a quick fix or a reason to pull over. Match your situation to the closest example.
Keep an eye on it
Shifts normally.
Schedule a repair
Harsh shifts or speedo issues. Repair soon.
Stop and get help
Limp mode. Drive gently straight to a repair.
Symptoms you might notice
- Erratic speedometer
- Harsh shifts
Common causes, cheapest first
- Failed output speed sensor
- Wiring problem
What you can check before calling
- Watch the speedometer
A code points to a system, not a part. Replacing parts based on the code alone is how people spend money without fixing the problem. Testing confirms the cause first.
Want the full story? Read our guide: Do you really need a transmission fluid change?.
Generic codes (second character 0) mean the same thing on every vehicle. Some manufacturers add their own details, so check service information for your exact vehicle.
Related codes
More transmission codes
Look up another code
Cummins fault code (like 1922), J1939 SPN and FMI (like SPN 3251 FMI 0), or an OBD-II code (like P0420).
Questions
What does P0720 mean?
P0720 means "Output Speed Sensor Circuit Malfunction". The transmission isn't getting a usable output speed signal.
Can I drive with code P0720?
It depends on what the vehicle is doing. Green: Shifts normally. Yellow: Harsh shifts or speedo issues. Repair soon. Red: Limp mode. Drive gently straight to a repair.
What causes P0720?
The most common causes are: failed output speed sensor; wiring problem.
Is P0720 a serious code?
It can be. Limp mode. Drive gently straight to a repair.
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