P0726 critical

Engine Speed Input Circuit Range/Performance

The P0726 code means the vehicle's onboard diagnostic system has detected: Engine Speed Input Circuit Range/Performance. This is a critical severity code.

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Keep driving?
Short distances only
DIY difficulty
hard
Estimated cost
$100 - $350 (parts and labor)
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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

  1. Monitor engine RPM on a scan tool -- look for noisy or erratic signal during shifts

  2. Compare CKP sensor signal to specification using an oscilloscope

  3. Check CKP sensor air gap and mounting for looseness

  4. Inspect reluctor ring for damaged or worn teeth

  5. 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.

Sources

This page is built from documented references. Verify against your own service info before repair work.

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