Engine Speed Input Circuit Range/Performance
What does P0726 mean?
The P0726 code means the vehicle's onboard diagnostic system has detected: Engine Speed Input Circuit Range/Performance. This is a critical severity code.
Common Symptoms
- Check Engine Light illuminated
- Harsh or delayed shifting
- Engine RPM flare during shifts
- Transmission slipping sensation
Probable Causes (Ranked by Likelihood)
- Degraded crankshaft position sensor signal Very High
- Air gap too large between CKP sensor and reluctor High
- Worn reluctor ring teeth Moderate
- TCM calibration or software issue Low
Step-by-Step Diagnostic Procedure
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Monitor engine RPM on a scan tool -- look for noisy or erratic signal during shifts
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Compare CKP sensor signal to specification using an oscilloscope
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Check CKP sensor air gap and mounting for looseness
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Inspect reluctor ring for damaged or worn teeth
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Replace CKP sensor if signal quality is poor
Frequently Asked Questions
Can I drive with code P0726?
Drive short distances only. Engine Speed Input Circuit Range/Performance can cause unsafe or unpredictable transmission behavior.
What causes P0726?
The most common cause is a faulty sensor or wiring issue. Degraded crankshaft position sensor signal is the most likely cause.
Is P0726 expensive to fix?
Typical repair costs range from $100 - $350 (parts and labor). Sensor replacement is the most common fix.