Engine Speed Input Circuit Intermittent
The P0728 code means the vehicle's onboard diagnostic system has detected: Engine Speed Input Circuit Intermittent. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- hard
- Estimated cost
- $100 - $350 (parts and labor)
Read and clear transmission codes. Many trans codes are caused by low or burnt fluid -- check level and color before assuming the worst.
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Basic scanners only read engine codes. This reads transmission, ABS, and airbag too.
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Common Symptoms
- Check Engine Light illuminated intermittently
- Random engine stalling
- Occasional harsh shifting
- Sporadic tachometer fluctuations
Probable Causes (Ranked by Likelihood)
- Loose CKP sensor connector Very High
- Intermittent break in CKP sensor wiring High
- CKP sensor air gap changing with vibration Moderate
- Failing CKP sensor Moderate
Step-by-Step Diagnostic Procedure
-
Wiggle CKP sensor connector while monitoring RPM on a scan tool
-
Check CKP sensor mounting bolt for tightness
-
Inspect wiring for damage at stress points
-
Monitor RPM signal during driving for dropouts
-
Replace CKP sensor if intermittent signal continues
Frequently Asked Questions
Can I drive with code P0728?
Drive short distances only. Engine Speed Input Circuit Intermittent can cause unsafe or unpredictable transmission behavior.
What causes P0728?
The most common cause is a faulty sensor or wiring issue. Loose CKP sensor connector is the most likely cause.
Is P0728 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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