Error code

OBD2 P0727

OBD2P0727
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Engine Speed Input Circuit No Signal.

Severity

severeThe vehicle may be drivable but with significant issues such as erratic gear shifts or a locked transmission. It is recommended to address the issue promptly.

Summary

P0727 indicates that there is no signal from the engine speed input sensor or circuit. This sensor can be located on the transmission casing or crankshaft position sensor depending on the vehicle.

Symptoms

  • Illuminated warning light
  • Multiple additional codes, especially communication-related ones (UXXXX)
  • No-start condition if CKP does double duty as engine speed input sensor
  • Increased fuel consumption
  • Harsh or erratic gear shifts
  • Transmission locked into one gear or unable to select gears
  • Vehicle may stall unpredictably at low speeds
  • Fail-safe mode activation

Common Causes

  • Defective or malfunctioning engine speed input sensor
  • Damaged, burnt, shorted, disconnected, or corroded wiring and/or electrical connectors
  • Poor electrical connections between PCM/TCM if they are separate modules

Diagnosis

  1. Check for damaged wiring and connectors related to the engine speed input sensor.
  2. Inspect the engine speed input sensor itself for signs of damage or malfunction.
  3. Verify electrical connections between PCM/TCM if they are separate modules.

Fixes

  • Replace the faulty engine speed input sensor

FAQ

What does P0727 mean?

P0727 indicates that there is no signal from the engine speed input circuit or sensor, which can affect transmission control.

Where is the engine speed input sensor located?

The location varies by vehicle but could be on the transmission casing or crankshaft position sensor depending on the make and model.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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