July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Diagnosis & Repair

Connect scan tool to DLC. Select CLEAR INFORMATION function. Road test vehicle. Crank engine if vehicle does not start. If DTC P0603 resets, replace PCM. Retest system. If DTC P0603 does not reset, check for an intermittent problem. See TESTS W/O CODES article.