Hi guys Today I scanned my car for trouble codes came back as code 41 CAM sensor failure. Do we have a cam sensor in our engines???? If not why would it give me this code?? Is this due to something else that maybe failing. I have a haynes, chilton, and an original gm shop manual. In the haynes manual I find the code 41 that says No distributor reference pulses to ECM with engine running/ it says the problem could be poor electrical connection, open or short in circuit, defective distributor pick up coil: fault in the MAP or VAC sensor circuit. In the GM Service manual it states No distributor reference signal. I did a real time data scan monitored MAP sensor the sensor volts charged during acceleration so I am guessing MAP sensor is ok? Thank you for your help ED