P0850
DTC P0850 (3.6L)
Circuit Description
The engine control module (ECM) provides 12-volts to the manual shift shaft park/neutral position (PNP) switch. The manual shift shaft position switch is a sliding contact assembly that attaches to the manual shift shaft inside the transmission. The switch consists of 5 separate circuits, 4 circuits indicate gear selector position to the transmission control module (TCM), and 1 indicates park/neutral position to the ECM. When the transmission is in PARK or NEUTRAL, the switch closes and pulls the ECM voltage low, 0-volts. When the transmission is not in PARK or NEUTRAL, the ECM voltage is high, 12-volts. The ECM uses the switch in order to enable starter operation.
If the PNP switch and the transmission manual shift shaft position switch do not agree for a specified length of time, DTC P0850 sets. DTC P0850 is a type C DTC.
DTC Descriptor
This diagnostic procedure supports the following DTC:
DTC P0850 Park/Neutral Position (PNP) Switch Circuit
Conditions for Running the DTC
The ignition is ON.
Conditions for Setting the DTC
DTC P0850 sets when either of the following conditions are true:
Condition 1
The PNP switch circuit is low, 0-volts, for 100 seconds while the TCM is reporting the gear selector is in REVERSE or any forward range.
Condition 2
The PNP switch circuit is high, 12-volts, for 200 seconds while the TCM is reporting the gear selector is in PARK or NEUTRAL.
Action Taken When the DTC Sets
* The ECM does not illuminate the malfunction indicator lamp (MIL).
* The ECM uses the transmission range data to enable engine cranking.
* The ECM stores the operating conditions when the Conditions for Setting the DTC are met. This information is stored as a Failure Record.
* The ECM stores DTC P0850 in ECM history.
Conditions for Clearing the MIL/DTC
* The ECM clears the DTC from ECM history if the vehicle completes 40 warm-up cycles without a non emission diagnostic fault occurring.
* The ECM cancels the default action when the ignition is OFF long enough in order to power down the ECM.
* A scan tool can clear the DTC.
