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 41 - Vehicle Speed Sensor Input Not Present: Description
When vehicle speed is greater than 3 MPH, Vehicle Speed Sensor (VSS) produces 16 electrical pulses per turbine shaft revolution. PCM detects vehicle speed by counting pulses from VSS. PCM sets code 41 if VSS input is zero, turbine speed is greater than 1400 RPM and throttle is held at a moderate opening.
- This step checks if code is still present.
- This step checks if a wiring or sensor problem is present. If not, PCM may be faulty.
- This step checks for a bad sensor.
- This step checks each circuit for short or ground condition.
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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.