Engine Speed Input Circuit No Signal
The P0727 code means the vehicle's onboard diagnostic system has detected: Engine Speed Input Circuit No Signal. This is a critical severity code.
- Keep driving?
- No -- stop driving
- 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
- Engine cranks but may not start
- No tachometer reading
- Transmission will not shift
Probable Causes (Ranked by Likelihood)
- Failed crankshaft position sensor Very High
- Broken CKP sensor wiring High
- Sheared reluctor ring or key Moderate
- TCM or ECM engine speed circuit failure Low
Step-by-Step Diagnostic Procedure
-
Check for engine RPM on scan tool -- 0 RPM while cranking confirms no signal
-
Inspect CKP sensor connector for disconnection
-
Measure CKP sensor resistance -- compare to spec (typically 200-2000 ohms)
-
Check wiring from CKP sensor to ECM and TCM for breaks
-
Replace the CKP sensor if it tests faulty
Frequently Asked Questions
Can I drive with code P0727?
Do not drive. Engine Speed Input Circuit No Signal can cause unsafe or unpredictable transmission behavior.
What causes P0727?
The most common cause is a faulty sensor or wiring issue. Failed crankshaft position sensor is the most likely cause.
Is P0727 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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