The meaning of the B1502 Code can be anything and to get the accurate meaning of the code, it is necessary to get model number and name of the manufacturer. Read the manual properly and start solving the problem. There are currently two main types of cylinder deactivation used today, depending on the type of engine. The B1502 code for the pushrod design what practices solenoids to change the oil compression distributed to the lifters. In their misshapen state, the lifters are incapable to raise their mate pushrods under the valve rocker arms, ensuing in valves that cannot be activated and persist closed.