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, Cylinder Select Error: Notes
ECM used for this engine can also be used for other engines. Difference is in MEM-CAL. If a Code 41 sets, incorrect MEM-CAL has been installed or MEM-CAL is faulty and must be replaced.
- Turn ignition off, and clear codes. Start engine, and run it for one minute. If code resets, check for faulty connection due to MEM-CAL not locked in place or incorrectly installed. If code does not recur, code is intermittent. See DIAGNOSTIC AIDS.
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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