What shuld you fix with code p1689 and p0602 01ram cummins?

The code P1689 typically indicates a problem with the communication between the Engine Control Module (ECM) and the ignition switch, often due to a faulty ignition switch or wiring issues. On the other hand, P0602 signifies a malfunction in the ECM, suggesting it may need reprogramming or replacement. To address these codes, first, inspect and repair any wiring or connections related to the ignition switch, then check the ECM for any faults or necessary updates. If issues persist, consider replacing the ECM.