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Symptom: P1899-P/N SWITCH PERFORMANCE POSSIBLE CAUSES INTERMITTENT PARK/NEUTRAL SWITCH SENSE CIRCUIT PARK/NEUTRAL POSITION SWITCH PARK/NEUTRAL SWITCH SENSE CIRCUIT OPEN PARK/NEUTRAL SWITCH SENSE CIRCUIT SHORTED TO GROUND POWERTRAIN CONTROL MODULE TEST ACTION APPLICABILITY 1 Turn the ignition on. t, read DTCs. Is the Good Trip Counter for P-1899 displayed and equal to 0? All Yes → No → 2 Turn the ignition on. t, read the PNP switch input state. While moving the gear selector through all gear positions (Park to 1st and back to t display P/N and D/R in the correct gear positions? All Yes → Test Complete. No → 3 Turn the ignition off. All Yes → No → Repair the PNP switch sense circuit for an open. 4 Turn the ignition off. All Yes → Repair the PNP switch sense circuit for a short to ground. No → 181 DRIVEABILITY - GAS |