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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 >> Conditions for Setting the DTC

Conditions for Setting the DTC

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.

DTC P1840 

Internal Mode Switch S = Less than 0. 7 V - For greater than 2 s

DTC P1841 

Internal Mode Switch S = Greater than 2. 38 V - For greater than 2 s

DTC P18B9 

Internal Mode Switch S = 1. 0 to 1. 7 V - For greater than 2 s

DTC P18BF 

Internal Mode Switch S = Invalid - For greater than 2 s

DTC P18C3 

Internal Mode Switch S = Invalid - For greater than 3 s

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