DTC 15

Check Engine Light indicates trouble code 15:
Most likely a problem in the Ignition Output Signal Circuit.

DTC 15: Ignition Output Signal (Part 1 Of 2):

DTC 15: Ignition Output Signal (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.