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.
Code 28, Trans. Range Pressure Switch: Notes
Transaxle range switch is a multiple signal switch that sends gear selector position information to the PCM. PCM determines gear selection from an internal table. This is important to maintain idle quality when shifting from Park to Drive as well as maintaining correct TCC engagement points. When Code 28 sets, PCM will default to 3rd gear until a correct signal is received by PCM.
- & 2) These steps check for proper operation of transmission range switch.
- This test checks for an open circuit, grounded circuit or short to voltage.
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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.