Error code

OBD2 P0720

OBD2P0720
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Output Speed Sensor Circuit.

Severity

moderateCan drive, but shifting and fuel economy may be affected.

Summary

P0720 indicates an issue with the output speed sensor circuit in the transmission control module (TCM) or powertrain control module (PCM). This sensor is crucial for detecting the speed of the transmission's output shaft, which helps in proper gear shifting.

Symptoms

  • Malfunction Indicator Lamp (Check Engine & Service Engine Soon) lights on
  • Speedometer issues displaying incorrect vehicle speed
  • Shifting problems, including rough or no upshifts
  • Poor fuel economy
  • Stalling in rare cases

Common Causes

  • Defective output speed sensor (OSS)
  • Wiring issues from the control module to the OSS
  • Corroded or defective electrical connectors

Diagnosis

  1. Check for open or shorted wiring between the OSS and control module.
  2. Inspect electrical connectors for corrosion or damage.
  3. Test the output speed sensor using a diagnostic tool.

Fixes

  • Replace defective output speed sensor

FAQ

What should I do if my car's Check Engine light comes on with P0720?

You should address the issue promptly by checking for wiring problems or a faulty output speed sensor. If unsure, consult a professional mechanic.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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