P0850 Code - Park/Neutral Position Switch Circuit

What does P0850 Mean?

The Transmission Control Module (TCM) monitors the Park/Neutral Switch signal. The TCM sets the OBDII code when the Park/Neutral Switch is not to factory specifications.

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What are the common causes of P0850 ?

• The Mass Airflow sensor is a hot wire that senses the volume of air entering the intake manifold. The computer uses this information to control fuel mixture.
• Defective ECU strategies or components will prevent proper regeneration
• Some aftermarket accessories and performance modifications

How do you troubleshoot P0850 ?

While fuel economy was increased, acceleration was seriously compromised, and the loss of engine vacuum led to a dangerous loss of braking assist when the P0850 code system was in four-cylinder mode. In addition to these issues, while the company proposed a hydraulically controlled system that could be switched from within the car, the version they implemented had to be manually changed in the engine compartment using hand tools.

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