DTC P0727 Engine Speed Input Circuit No Signal

DTC P0727 signifies an issue with the Engine Speed Input Circuit, specifically indicating a lack of signal from the engine speed sensor. The Engine Control Module (ECM) or Transmission Control Module (TCM) detects this when no signal is received from the engine speed sensor, which monitors the engine’s rotational speed.

1. What does P0727 code mean?

DTC P0727 indicates that the ECM or TCM has detected a complete absence of signal from the engine speed sensor. The absence of this crucial input can affect various control functions within the engine and transmission systems, potentially leading to performance issues.

2. What are the causes of DTC P0727?

Possible causes for DTC P0727 include:

  • Faulty Engine Speed Sensor: A malfunctioning or failed engine speed sensor can result in a complete absence of signal transmission.
  • Wiring Issues: Damaged, severed, or shorted wires in the engine speed sensor circuit can prevent signal transmission.
  • Poor Sensor Connection: Loose or poor connections at the engine speed sensor or its connectors can interrupt signal transmission.
  • ECM or TCM Problems: Rarely, internal malfunctions within the ECM or TCM might prevent proper communication with the engine speed sensor.

3. What are the symptoms of DTC P0727?

Signs associated with DTC P0727 may include:

  • Check Engine Light: The illumination of the Check Engine Light to indicate the absence of signal from the engine speed sensor.
  • Engine Performance Issues: Possible engine stalling, reduced power, or rough idling due to a lack of engine speed signal input.
  • Transmission Problems: Erratic shifting, failure to shift gears properly, or transmission hesitation in automatic transmissions due to missing input signals.

4. How to diagnose DTC P0727?

Diagnostic steps for DTC P0727 might include:

  • Code Reading: Use an OBD-II scanner to retrieve the code and identify any accompanying codes stored in the ECM or TCM.
  • Visual Inspection: Inspect the engine speed sensor, wiring, and connectors for physical damage, corrosion, or loose connections.
  • Sensor Testing: Test the engine speed sensor’s functionality and check for signal output using appropriate diagnostic tools.
  • Circuit Testing: Check the circuit for continuity, shorts, or open circuits to identify issues impeding signal transmission.

5. How to fix DTC P0727 problem?

Steps to resolve DTC P0727 might include:

  • Engine Speed Sensor Replacement: Replace the engine speed sensor if it’s found to be malfunctioning or not producing any signal.
  • Wiring Repair: Fix or replace damaged wiring and ensure secure connections within the engine speed sensor circuit.
  • Connector Check: Repair or replace damaged connectors to ensure a stable electrical connection.
  • ECM or TCM Examination: Rarely, issues within the ECM or TCM might be causing communication problems and might require professional diagnosis and repair.


DTC P0727 indicates a complete absence of signal from the engine speed sensor, affecting engine and transmission functionality. Resolving this issue involves inspecting, testing, and potentially replacing the engine speed sensor, associated wiring, or connectors to ensure proper signal transmission and optimal engine and transmission performance.