P0850

P0850-PARK/NEUTRAL SWITCH PERFORMANCE



- When Monitored:
Continuously with the transmission in Park, Neutral, or Drive and NOT in Limp-in mode.

- Set Condition:
This code will set if the PCM detects an incorrect Park/Neutral switch state for a given mode of vehicle operation. One trip fault. Three good trips to turn off the MIL.





Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. Pre-Diagnostic Troubleshooting Procedure.

1. P/N AND D/R NOT IN CORRECT POSITION

NOTE: Before continuing, ensure communication can be established with the TCM. If the scan tool is unable to communicate with the TCM or if there are related communication DTCs present refer to the Communication Category and perform the appropriate symptom.

1. Ignition on, engine not running.
2. With the scan tool, read DTCs.

Is the DTC active at this time?

Yes

- Go To 2

No

- Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Intermittent Condition Test
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test

2. CHECKING TCM DTC(S)
1. Turn the ignition off.
2. With the scan tool, read TCM DTCs.

Is there any there Transmission DTC(s) present?

Yes

- Refer to the appropriate Transmission test in the Transmission category.

No

- Before continuing, check the PCM harness connector terminals for corrosion, damage, or terminal push out. Repair as necessary. Replace and program the Powertrain Module.
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test