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, Throttle Switch Circuit: Notes
ECM supplies B+ to a throttle switch on throttle body. When engine is idling, ECM senses a low signal voltage. With throttle slightly open, ECM will sense a high signal voltage. At wide open throttle, signal voltage is low. Code 41 is set if ECM senses a low or high voltage signal all the time.
- ECM supplies battery voltage to the throttle switch. Poor connection or a ground circuit will indicate a low signal.
- Checks for a misadjusted throttle switch.
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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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