Chevrolet Repair Questions? Ask a Mechanic for Answers ASAP
P0336 sets when the ECM does not get a signal from the crank sensor. This could be caused by a bad sensor, bad connections or wiring, or even a bad ECM.
First, turn ignition on and check both Pink and Yellow wires for system voltage with a test light. If OK, connect a voltmeter set to AC voltage frequency (HZ) to read duty-cycle between the Pink and Yellow wires and crank the engine. Replace sensor if duty-cycle not between 40 and 60%.