Code 16: System Volt High: Notes

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The ECM monitors battery voltage on circuit No. 440. If the ECM detects battery voltage greater than 16 volts for more than 10 seconds, it will set a Code 16 in memory.

NOTE: Test numbers refer to test numbers on diagnostic chart. Starting engine with battery charger connected may set Code 16.

Test alternator output to determine proper operation of voltage regulator. Increase engine speed to a moderate level and measure voltage across battery terminals. If reading is greater than 16 volts, service alternator.