This code indicates that a fault has been detected in the generator lamp control circuit. The PCM may have also detected an abnormal voltage reading from the vehicle battery, starting, or charging system.
In the event of generator lamp control circuit fault, a trouble code will be stored and a service engine soon lamp will be illuminated. Some models require multiple drive cycles (as many as 8) with a failure in order for the service engine soon lamp to be illuminated and others will activate it on the initial failure.
This code indicates that a fault has been detected in the charging system circuit. The PCM may have also detected an abnormal voltage reading from the vehicle battery, starting, or charging system.
The most common cause of this code can be traced to a faulty alternator. Other causes could include a bad battery or starter, open or shorted wiring or battery cables, insufficient battery primary or secondary grounds, defective voltage regulator, corroded battery terminal ends, a faulty PCM (rare), a large battery drain, or a defective battery.
Technicians report that batteries and starters are often replaced in error when the alternator is either not charging or overcharging. If the battery is discharged, charge it and test the vehicle charging system to make sure that it is operating properly.
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The IPC determines that the system voltage is less than 11 volts or greater than 16 volts. The IPC receives a class 2 message from the body control module (BCM) indicating the system voltage
Charge Indicator Always On
Step
Action
Yes
No
1
Did you perform the Diagnostic System Check for Starting and Charging? yes or no
Go to Step 2 yes
Go to Diagnostic System Check - Engine Electrical no
2
Automatic: The UPS performs a self-test automatically when turned on, and every
two weeks thereafter (by default). During the self-test, the UPS briefly operates the
connected equipment on battery.
Manual: Press and hold the button for a few seconds to initiate the self-test
REPLACE BATTERY LED ILLUMINATES
Replace Battery LED flashes and
short beep is emitted every two
seconds to indicate the battery is
disconnected.
Check that the battery connectors are fully engaged.
Weak battery. Allow the battery to recharge for 24 hours. Then, perform a self-test. If the
problem persists after recharging, replace the battery.
Failure of a battery self-test. The UPS emits short beeps for one minute and the Replace Battery LED
illuminates. The UPS repeats the alarm every five hours. Perform the self-test
procedure after the battery has charged for 24 hours to confirm the Replace
Battery condition. The alarm stops and the LED clears if the battery passes the
self-test.
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