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Home >> Chevrolet >> 2020 >> Express 2500 LS, 6.0L Eng VIN G >> Repair and Diagnosis >> External Pages >> Different car >> Section 56 (Automatic Transmission - 6L90 (MYD) - Diagnostic Information And Procedures) >> Diagnostic Information and Procedures >> DTC P0741 or P0742 >> Diagnostic Fault Information

Diagnostic Fault Information

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.
NOTE:

The components are listed from the least to the most intrusive to service.

Component DTC Condition
Q8 Control Solenoid Valve Assembly P0741, P0742
  • Q39A Torque Converter Clutch Pressure Control Solenoid Valve - Binding or Sticking / Stuck
  • Control Solenoid Valve Assembly Filter Plate - Restricted or Cracked
  • O-Ring - Leaking
Control Valve Channel Plate P0741 Oil Channels or Orifices - Restricted
Control Valve Channel Plate Spacer Plate P0741 Oil Channels or Orifices/Restricted
Control Valve Upper Body P0741 Exhaust - Oil Channels or Orifices - Restricted
P0741, P0742 Torque Converter Clutch Regulator Valve - Binding or Sticking / Stuck
Torque Converter P0741
  • Torque converter clutch friction lining worn.
  • Torque converter bolts too long damaging the clutch friction surface.
  • Torque Converter Fluid Seal - Leaking
Automatic Transmission Case Cover P0741, P0742
  • Pressure release valve leaking.
  • Spring - Damaged spring
Automatic Transmission Fluid Pump Assembly P0741, P0742 Torque Converter Clutch Control Valve - Binding or Sticking / Stuck
Stator Shaft Support P0741 Seal - Leaking
Turbine Shaft P0741 Turbine Shaft Seal - Leaking
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