What are the common causes of P0852?

An open in the park/neutral input wire. A misadjusted park/neutral switch. A backed out park/neutral connector pin. A PCM that misreads the input.

Read park/neutral input voltage. Test the input wire for an open. Check the park/neutral switch adjustment. Wiggle test the switch connector. Replace the switch if the signal stays high. Clear the code and retest.

P0852

Park/Neutral Switch Input Circuit High

System: Transmission (P code)
Lamp: Check Engine Light
Category: Powertrain - Transmission

What it means

P0852 means Park/Neutral Switch Input Circuit High.

Where it lives

For P0852, the switch sits on the circuit this code reports. The description of P0852 reports a fault at the switch.

Check these first

An open in the park/neutral input wire
A misadjusted park/neutral switch
A backed out park/neutral connector pin
A PCM that misreads the input

What to do next

Read park/neutral input voltage
Test the input wire for an open
Check the park/neutral switch adjustment
Wiggle test the switch connector
Replace the switch if the signal stays high
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.