P0615 indicates a problem with the starter relay circuit that supplies power to the starter motor when the ignition is turned on.
The relay itself can fail internally, preventing it from energizing and allowing power to reach the starter motor.
Poor contact at the relay socket, wiring harness, or ground can interrupt the circuit and trigger the code.
A blown fuse removes power to the relay coil, causing the PCM to detect a malfunction.
If the switch does not send the proper start signal, the relay coil never receives voltage.
A rare internal failure in the PCM can prevent it from energizing the relay, but this is usually a last‑resort diagnosis.
Yes, a failed starter relay is the most common cause of this code.
No, PCM failure is rare; the issue is usually a relay, fuse, or wiring problem.
The starter relay may be engaging but not delivering enough current due to a bad connection or weak relay.
Yes, a blown fuse in the starter circuit will prevent power to the relay and set the code.