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Home >> Pontiac >> 2004 >> Vibe GT >> Repair and Diagnosis >> External Pages >> Different variant/trim >> Section 2 (Automatic Transmission - Mu4 (Introduction, Service & Replacement)) >> Diagnostic Information and Procedures >> DTC P1780 >> Circuit Description

Circuit Description

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The Powertrain Control Module (PCM) determines when the vehicle is in Park or Neutral gear position through the Park/Neutral Position (PNP) switch. The RED/BLK wire to the PCM is grounded by the PNP switch when the transmission manual selector is in either Park or Neutral gear position.

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