What is code P2509 mean?
What is code P2509 mean? If you're using an OBD-II scanner to find out why your check engine light is on, a P2509 code means that your engine's electric signal to the ECM is intermittent rather than constant. As a result, the ECM is not getting the steady power supply from the battery it needs to function properly. What does p2509 mean on a Cummins Engine? P2509 appears on Cummins engines when there is an electronic signal being sent to the ECM/PCM that is faulty or intermittent. Electronic signals are measured within parameters, and when the signal falls outside of...