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
Transmission range switch is a multi-signal switch that sends a signal indicating gear selection to Powertrain Control Module (PCM). Transmission range switch uses 4 circuits to pull 4 PCM voltage low in various combinations to indicate each gear range. Voltage level of circuits is represented as LOW (grounded) or HIGH (open). The 4 states displayed represents decoder P, A, B and C inputs.
Conditions for setting DTC are: PCM recognizes an invalid PRNDL parameter, vehicle speed greater than 5 MPH and conditions are met for a period longer than 5 seconds.
NO RELATED
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Affiliate disclosure: We may earn a commission at no extra 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.