Output Speed Sensor Circuit Malfunction
The controller detected a problem in the transmission output-speed signal circuit. That signal helps monitor output rotation and shifting, and may also contribute to vehicle-speed information. P0720 does not identify an ABS wheel sensor as failed. Wiring, connectors and the output sensor require checks for the specific transmission, rather than replacing a part based only on the code name.
Can I keep driving?
Slipping, harsh engagement, inability to select or hold a gear, burning odor or a transmission-temperature warning calls for a safe stop and towing. If only the light is on and shifts feel normal, get guidance from a shop familiar with the transmission before further driving.
Flashing light, burning smell or smoke? Pull over safely. Danger to life: call 911.
What does this code mean for your car?
The same code can need different checks depending on the model and engine. Enter your vehicle details to find relevant sources and checks.
Symptoms
- Harsh shifts or delayed shifting
- Limited transmission operating mode
- Engine or transmission warning
Possible causes
- 1Faulty output speed sensor
- 2Open, short or poor contact in wiring
- 3Damage to the target or sensing component
- 4Supply or transmission control fault
These possibilities are not ranked by frequency and do not diagnose your vehicle.
Checks you can safely do yourself
Safe checks only: engine off and cold, car on level ground.
- Save the code and freeze-frame data if your scanner offers them, without clearing anything.
- Note when abnormal shifting already occurred; do not drive to recreate it or inspect wiring underneath the vehicle.
When you need a shop
Request a transmission scan and comparison of the output speed sensor signal with other speed signals, plus wiring and target checks using the manufacturer procedure. Slipping or unpredictable shifts calls for towing.
How much does it cost?
A US repair estimate needs a diagnosis and a local shop quote.
No verified US repair quote is available for this fault. The price depends on diagnosis, vehicle, parts and local labor; request 2-3 itemized quotes.
Get 2-3 quotes
Investigate this code for my carFAQ
Can I keep driving with P0720?
Slipping, harsh engagement, inability to select or hold a gear, burning odor or a transmission-temperature warning calls for a safe stop and towing. If only the light is on and shifts feel normal, get guidance from a shop familiar with the transmission before further driving.
What can cause P0720?
Possible causes include faulty output speed sensor; open, short or poor contact in wiring; damage to the target or sensing component; supply or transmission control fault. These are diagnostic possibilities, not a confirmed diagnosis or a parts shopping list.
Does clearing the code fix the problem?
No. Clearing a code does not repair the problem or prove that no fault exists. It may erase useful evidence and reset readiness monitors. Save codes and freeze-frame data first; confirming a repair requires the vehicle-specific checks.
What if this code appears during a used-car inspection?
Arrange an independent professional pre-purchase inspection before committing. Request a complete scan, readiness status and diagnosis of the relevant system. Get written findings and a repair estimate; an unlit warning lamp does not replace inspection.
How much does a P0720 repair cost?
No verified US repair quote is available for this fault. The price depends on diagnosis, vehicle, parts and local labor; request 2-3 itemized quotes.