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, Cam Sensor Circuit (3.8L): Notes
Code 41 will set if engine is running and a cam sensor signal is not received by ECM for last 5 seconds.
- Verifies proper operation of circuits No. 633, 644 and 645.
- Tests circuit No. 630 from C(3)I module to ECM.
- If camshaft gear magnet is interfacing with cam sensor, voltage reading will be zero. Bumping engine should correct this condition.
- If voltage reading is constantly varying around a midpoint of 4.6 volts and connections are good, PCM is faulty.
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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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