Ok so I have gotten new batterys
He is what an Internet search yielded;
Diagnostic trouble code (DTC) P2509 stands for “
PCM Power Input Signal Intermittent.” This code is logged when the powertrain control module (PCM) loses its power supply. Like any electrical device, the PCM needs a complete circuit with power and ground. The PCM relies on a constant power supply from the battery.
What repairs can fix the P2509 code?
- Repair or replace blown fuse.
- Repair or replace faulty fusible link.
- Repair or replace faulty circuits.
- Repair or replace faulty battery.
- Repair or replace faulty battery cables.
- Repair or replace faulty PCM relay.
- Replace and reprogram PCM.
I would disconnect (all wiring) the after-market alarm system, it could be acting badly causing collateral issues. Hold back on the parts cannon until you discover the root cause and then repair that.
A wiring/connector/fuse issue is your likely problem, at least that is what the evidence is pointing to at this point. As a start, check all the wiring ground points, fuse/circuit breaker seating. I can't think of anything, anyone?