OBD
P0726
Engine Speed Input Circuit Range/Performance
What it means
P0726 means Engine Speed Input Circuit Range/Performance.
Check these first
- A dirty or failing engine speed sensor
- A weak signal from a worn reluctor
- Corrosion in the sensor connector
- An ECM calibration issue
- Debris on the sensor tip
What to do next
- Read engine speed on a scan tool while cranking
- Inspect the sensor and reluctor for damage
- Check the connector for corrosion
- Compare commanded and actual engine speed
- Replace the engine speed sensor if the signal is weak
- Clear the code and retest
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Updated
Generic SAE J2012 definition. Last updated 2026-10-10.