What does P0851 Mean? OBD-II Code Engine may not start is defined as a Park/Neutral Switch Input Circuit Low The engine computer (PCM) needs to know when the transmission is in Park/Neutral, as this is required before the vehicle can safely be started. The PCM depends on the park/neutral safety switch to communicate when the transmission is in Park/Neutral. If the Park/Neutral Safety Switch fails to operate properly, code P0851 will be set. The engine may be disabled from starting. engine code P0851P0851 fixobd P0851dtc P0851obd code P0851obd2 P0851P0851 car codediagnostic code P0851car code P0851check engine code P0851fehlercode P0851P0851 fiatcodigo P0851codigo falla P0851P0851 kody b??dówcodigo de falla P0851 What are the common causes of P0851 ? Faulty Park/Neutral Switch Park/Neutral Switch harness is open or shorted Park/Neutral Switch circuit poor electrical connection How do you troubleshoot P0851 ? The original multi-displacement system turned off opposite pairs of cylinders, allowing the engine to have three different configurations and displacements. P0851 code had an elaborate diagnostics procedure, including showing engine trouble codes on the air conditionning display. However, the system was troublesome, misunderstood by customers, and a rash of unpredictable failures led to the technology being quickly retired. Searches related to P0851 - Park/Neutral Position Switch Circuit Low Voltage p0851 code subaru manual transmission p0851 subaru forester p0852 subaru forester code po851 p1152 subaru p0852 subaru forester neutral switch input circuit low p0852 code subaru manual transmission