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Home >> Cadillac >> 2018 >> Escalade Base, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 21 (Automatic Transmission - 8L90 (M5U) - Diagnostic Information And Procedures) >> Diagnostic Information And Procedures >> DTC P1840, P1841, P18B9, P18BE, Or P18C3: Internal Mode Switch S Circuit >> Diagnostic Fault Information

Diagnostic Fault Information

WARNING: This page is about a different car, the 2018 Chevrolet Suburban 3500 HD. However, it is still accessible from the selected car via links, so may be relevant.
Circuits Short to Ground Open/High Resistance Short to Voltage Signal Performance
9 V Reference P1840 P1840 - -
Signal P1840 P1840 P1841 P18BA/P18BF
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