Test Description

WARNING: This page is about a different car, the 1995 Oldsmobile Ninety-Eight and 1995 Buick Park Avenue. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Test numbers refer to numbers on diagnostic chart.

Checks for closed switch in Park.
Checks for on open switch in Drive.
Ensure scan tester does not indicate P/N "actual" as yes even when wiggling shifter. This tests for an intermittent or misadjusted switch.

Fig 1: Code P1520 Schematic (3.8L) Park/Neutral Switch

Fig 2: Code P1520 Diagnostic Flow Chart (3.8L) Park/Neutral Switch