DTC P0A1A-87: Generator Control Module - Missing message: Action

Check the integrity of the primary battery connectors and rectify as required
Check the integrity of the generator connectors and rectify as required
Refer to the appropriate system wiring diagrams and check the LIN bus circuit between the gateway module and the generator for short circuit to ground, short circuit to power, open circuit, high resistance. Repair circuit as required. Clear the DTCs and retest
If the fault persists, install a new generator as required. Clear the DTCs and retest