Engine Control System

Check Engine Light blinks twenty-one times:

Most likely a problem in the VTEC Solenoid Valve Circuit.

DTC 21: V-TEC Solenoid Valve (part 1 Of 2):

DTC 21: V-TEC Solenoid Valve (part 2 Of 2):

The Check Engine warning light may come on, indicating a system problem, when, in fact, there is a poor or intermittent electrical connection. First, check the electrical connections, clean or repair connections if necessary.