P0727 critical

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.

My Garage →
Keep driving?
No — stop driving
DIY difficulty
hard
Estimated cost
$100 - $350 (parts and labor)
ANCEL AD310 OBD-II Scanner
Check Your Fluid First
ANCEL AD310 OBD-II Scanner

Read and clear transmission codes. Many trans codes are caused by low or burnt fluid -- check level and color before assuming the worst.

Check Price on Amazon
LAUNCH CRP123X (Reads All Systems)
Read Transmission Codes
LAUNCH CRP123X (Reads All Systems)

Basic scanners only read engine codes. This reads transmission, ABS, and airbag too.

Check Price on Amazon

Affiliate links — we earn a commission at no extra cost to you.

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

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?

Estimated repair costs range from $100 - $350 (parts and labor). Sensor replacement is the most common fix.

Mechanics Guide Step-by-step diagnosis

Step-by-Step Diagnostic Procedure

  1. Check for engine RPM on scan tool -- 0 RPM while cranking confirms no signal

  2. Inspect CKP sensor connector for disconnection

  3. Measure CKP sensor resistance -- compare to spec (typically 200-2000 ohms)

  4. Check wiring from CKP sensor to ECM and TCM for breaks

  5. Replace the CKP sensor if it tests faulty

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)

Commonly Affected Vehicles

  • 2003-2015 Chrysler 300
  • 2004-2016 Dodge Charger
  • 2005-2017 Jeep Wrangler
  • 2002-2014 Ford Ranger

Related Codes

P0725P0726P0335

Explore More

Search codes Vehicle-specific fixes Guides By make

Was this helpful?

Send this to whoever is fixing the car — your mechanic, or the person asking what the light means.

Browse by symptom → Read repair guides → Fixes by vehicle →