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.
Basic scanners only read engine codes. This reads transmission, ABS, and airbag too.
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What Are the Symptoms of P0728?
- Check Engine Light illuminated intermittently
- Random engine stalling
- Occasional harsh shifting
- Sporadic tachometer fluctuations
What Causes P0728? (Most Likely First)
- 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
Can I Still Drive with P0728?
Short distances only. P0728 is rated moderate severity. Keep trips short and get it diagnosed soon rather than waiting for symptoms to worsen.
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?
Estimated repair costs range from $100 - $350 (parts and labor). Sensor replacement is the most common fix.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose P0728?
-
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
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Monitor RPM signal during driving for dropouts
-
Replace CKP sensor if intermittent signal continues
Sources 1
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
Which Vehicles Commonly Get P0728?
- 2003-2015 Toyota Camry
- 2004-2016 Honda Civic
- 2005-2017 Ford Fusion
- 2002-2014 Nissan Sentra
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