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2001 GMC YUKON XL 2500
6.0L V8 Vortec•4WD•AUTOMATIC•gas
9 active safety recalls on this vehicle — view recalls
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Repairs0Labor492Torque1427Fluid10DTC1767Battery1Maintenance0Recalls9
P0728moderate severityPowertrain

Engine Speed Input Circuit Intermittent

on 2001 GMC Yukon XL 2500 6.0L V8 Vortec · 4WD

What this code means

The engine speed signal to the transmission controller drops out intermittently. The RPM value is needed for reliable shift and lockup control.

Symptoms

  • Intermittent harsh shifting
  • Random torque converter faults
  • Check engine light comes and goes

Common causes

  • Loose or corroded connector
  • Intermittent wiring fault
  • Failing engine speed sensor
  • Faulty TCM

Diagnostic steps

  1. Retrieve codes and freeze frame
  2. Monitor RPM signal for dropouts
  3. Wiggle-test wiring and connectors
  4. Replace sensor if signal is intermittent
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