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Home >> Cadillac >> 2018 >> Escalade Base, 4WD >> Repair and Diagnosis >> External Pages >> Different car >> Section 19 (Automatic Transmission - 6L80 (MYC) Or 6L90 (MYD) - Diagnostic Information And Procedures) >> Diagnostic Information And Procedures >> DTC P0850, P0851, Or P0852: Park/Neutral Position Switch >> Circuit/System Description

Circuit/System Description

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The transmission manual shift shaft switch assembly, also known as the internal mode switch, is a sliding contact switch attached to the manual shift shaft inside the transmission case. The park/neutral position switch is integrated into the internal mode switch and connects to the Transmission Control Module lead-frame through a short wire harness. The circuit uses the Transmission Control Module as a pass-through connector only.

The Park/Neutral Signal is sent from the park/neutral switch directly to the engine control module (ECM) and is used for engine start enable.

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