HANDLE AS-WINDOW 3707805 - Caterpillar

Which Generate This Code:This diagnostic code is recorded when the system voltage is greater than 29.5 DCV. The solenoids may be damaged if the voltage remains high for an extended period of time. The possible causes of this diagnostic code are listed below:
The harness wiring has failed.
A charging system component has failed.
The ECM has failed. This is unlikely. Test Step 1. CHECK THE CHARGING SYSTEM
Turn the key start switch to the ON position.
Observe the status of the diagnostic code. Expected Result:The diagnostic code is active. See System Operation, SENR2947, "Starting and Charging System".Results:
YES - The diagnostic code is active. Proceed to Test Step 3.
NO - The diagnostic code is NOT active. Proceed to Test Step 2.Test Step 2. CHECK THE CHARGING SYSTEM
Start the engine.
Observe the status of the diagnostic code. Expected Result:The diagnostic code is active. See System Operation, SENR2947, "Starting and Charging System".Results:
YES - The diagnostic code is active.Repair: The charging system is charging at an excessive voltage. Check the charging system.STOP
NO - The diagnostic code is not active. Repair: There is no problem at this time. Resume normal operation.STOPTest Step 3. CHECK THE BATTERY VOLTAGE
The engine is stopped. At the battery, measure the voltage across the battery terminals. Expected Result:The voltage is less than 29.5 VDC.Results:
YES - The voltage is less than 29.5 VDC.Repair: Exit this procedure and perform the diagnostic code procedure again. If the problem persists, the ECM may have failed. Prior to replacing an ECM, always contact your dealership's Technical Communicator for possible consultation with Caterpillar. This consultation may greatly reduce repair time. If the cause of the diagnostic code is not found, replace the Power Train ECM. See the Troubleshooting, "Electronic Control Module (ECM) - Replace". STOP
NO - The voltage is greater than 29.5 VDC.Repair: The charging system is charging at an excessive voltage. Check the charging system. See System Operation, SENR2947, "Starting and Charging System".STOP