U1504 Mitsubishi L200 [better] -

The CAN bus requires stable voltage (typically 9–16V). A failing battery, corroded terminals, or a loose engine ground strap can cause the ECM to drop off the network. This is the of intermittent U1504 codes.

While U1504 can theoretically appear on any L200 with a CAN bus network, it is most frequently reported on: u1504 mitsubishi l200

In plain English, this means that the main engine computer (ECM) has stopped communicating properly with other critical modules on the vehicle’s CAN bus network. The CAN bus is a two-wire twisted pair system (CAN High and CAN Low) that allows sensors, the ABS module, the transmission control unit (TCU), the airbag module, and the ECM to talk to each other. The CAN bus requires stable voltage (typically 9–16V)

To resolve persistent codes that aren't affecting vehicle performance, a dealer-level tool like the M.U.T.-III While U1504 can theoretically appear on any L200