Code B411 - Battery Low: Notes

Code B411 will set when the ignition is on and the engine RPM is greater than 800 and the BCM is seeing an ignition-1 reference voltage of less that 10.6 volts. During the time the failure is present the cruise control will be disengaged. This code should be fixed before trusting any other code that has been set as low voltage could cause false setting of codes.

1. BCM data value BD50 displays battery voltage. The normal range is between 10.6 and 16 volts.
2. Check to see if the low voltage readings are due to circuitry or the battery. With the engine running, if voltage is below 10 volts the BCM and wiring are okay.
3. Check to see if the low voltage reading is due to the circuit or the BCM. If the voltage at the BCM is below 10.6 volts, then the BCM is okay.