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 P024, Vehicle Speed Sensor (VSS) Circuit Problem: Action
PCM turns on MIL and disables Torque Converter Clutch (TCC) and cruise control for the entire ignition cycle. PCM will substitute a calculated vehicle speed based on transaxle input speed and the current gear commanded (gear ratio). PCM freezes transaxle in current gear and torque management is disabled.
- If Code P025 is current, fault is present and can be diagnosed directly. If Code P025 is stored as history, refer to Code P075 to diagnose fault.
- VSS will generate a frequency of greater than zero Hertz when spun by hand. If it does, PCM is faulty. If it does not, check circuit or sensor for open or short.
Use the Manual With the Right Hardware
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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.
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