Conditions for Setting the DTC

WARNING: This page is about a different car, the 2015 Chevrolet Trax and 2015 Buick Encore. However, it is still accessible from the selected car via links, so may be relevant.

P0850 and P0851

ECM detects the Park/Neutral switch signal equals 0 V (Park/Neutral) when the transmission internal mode switch reports a Drive range.
Throttle position is 10 % or greater.
Engine torque is 75 (55 lb ft) or greater.
Vehicle speed is 10 km/h (6 mph) or greater.
Above conditions must be met for 0.2 s.

P0852

ECM detects the Park/Neutral switch signal equals 12 V (In Gear) when the IMS reports a Park/Neutral range for 0.2 s.