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Chevrolet
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2020
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Bolt EV Premier
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Repair and Diagnosis
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Body & Frame
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Diagnostic Information and Procedures
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DTC B3121
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Circuit/System Verification
Circuit/System Verification
Ignition - On / Vehicle - In Service Mode
Verify no other DTCs are set.
If other DTCs are set
Refer to
Diagnostic Trouble Code (DTC) List - Vehicle
Go to next step: If no DTC is set
Refer to Circuit/System Testing.