Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Circuit Description
Park/neutral position switch is on whenever shift lever is in "N" or "P" position. With switch on, ECM terminal NSW is grounded via starter relay (zero voltage at terminal NSW). With shift lever in "D", "2", "L" or "R" position, switch is off (battery voltage at terminal NSW). DTC is set under the following conditions:
- Two or more switches are on simultaneously for "N", "2" or "L" position.
- If park/neutral position switch is on while driving vehicle for 30 seconds or more at 25 MPH or more.
- If park/neutral position switch is on while driving vehicle for 30 seconds or more with engine speed at 1500-2500 RPM.
Possible causes are:
- Short in park/neutral position switch circuit.
- Park/neutral position switch.
- ECM.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
No obligation. See pricing before you book.