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 (PNP) switch delivers input signals to ECM. Input signals are used for air/fuel correction and for idle speed control. DTC is set when PNP switch is on when vehicle is being operated for more than 30 seconds at 44 MPH or more with engine speed of 1500-2500 RPM. Possible causes are:
- PNP switch circuit is shorted.
- Defective PNP switch.
- Defective ECM.
NO RELATED
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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.