CYLINDER GP-GRAPPLE 4544569 - Caterpillar

This code indicates that the battery circuit for the Electronic Control Module (ECM) has low voltage while the engine is running. If battery voltage disappears without returning, the ECM will not log this diagnostic code and the engine will shut down.The ECM detects the following conditions:
The keyswitch is in the ON position.
The engine is not cranking.
The engine is running for more than three seconds.
The battery voltage to the ECM is below 18 Volts for more than 0.5 seconds.System Response:The ECM will log the diagnostic code.The engine will be derated.A warning will appear on the display on the control panel.Possible Performance Effect:The engine may experience changes in the engine rpm, and intermittent engine shutdowns or complete engine shutdowns while the conditions that cause this diagnostic code are present.Troubleshooting:Test Step 1. Perform the following diagnostic procedure: "Ignition Keyswitch Circuit and Battery Supply Circuit - Test"Results:
OK - STOP