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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 >> DTC P1840, P1841, P18B9, P18BE, or P18C3 >> DTC Descriptor

DTC Descriptor

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DTC P1840

Internal Mode Switch S Circuit Low Voltage

DTC P1841

Internal Mode Switch S Circuit High Voltage

DTC P18B9

Internal Mode Switch S Circuit Shorted

DTC P18BE

Internal Mode Switch S Stuck Off

DTC P18C3

Internal Mode Switch S Stuck On

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