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Home >> Chevrolet >> 2009 >> Impala Police >> Repair and Diagnosis >> Transmission >> Hydraulic Diagrams >> Automatic Transmission - 4T65-E - Removal & Installation, Service, Overhaul, Troubleshooting & Diagnosis >> Diagnostic Information And Procedures >> High or Low Upshift or Downshift Speed

High or Low Upshift or Downshift Speed

Checks Cause
DEFINITION: An upshift or a downshift, or TCC apply, that occurs at a speed outside of the calibrated range. Refer to Shift Speed .
ECM/PCM Calibration Information Incorrect calibration in the ECM/PCM.
Throttle Position (TP) Sensor Misadjusted or faulty TP sensor.