P0726 – Engine Speed Input Range/Performance

Description

The ECM detects an engine speed input signal outside expected range.

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Symptoms

  • Harsh shifting
  • Limp mode
  • No upshift

Causes

  • Faulty crank sensor
  • Wiring issues
  • ECM fault

Diagnosis

  • Monitor RPM signal
  • Inspect wiring
  • Test crank sensor

Repair

  • Replace crank sensor
  • Repair wiring

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