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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 57 (Automatic Transmission - 8L90 (M5U) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> Harsh Garage Shift

Harsh Garage Shift

WARNING: This page is about a different car, the 2019 GMC Savana 3500, 2019 GMC Savana 2500, 2019 Chevrolet Express 3500, and 2019 Chevrolet Express 2500. However, it is still accessible from the selected car via links, so may be relevant.
Checks Causes
NOTE:

On cold days, approximately 32°F (0°C) or colder, the transmission is designed to shift differently. The transmission uses a warm-up mode shift schedule until the engine reaches normal operating temperature. While the transmission is in warm-up mode, it is normal for transmission upshifts to be delayed or held longer. This feature improves heater performance by giving quicker vehicle warm-ups.
Engine Elevated engine RPM - Verify correct engine operating rpm per application.
Control Solenoid (w/Body and Valve) Valve Assembly (40)
  • Incorrect or inadequate adapt activity - Perform Transmission Service Fast Learn Procedure procedure.
  • Incorrect TCM temperature reporting - Monitor TCM temperature using a scan tool.
  • Line pressure control solenoid incorrect pressure.
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