B121A Diagnostic Guide
B121A may indicate that the climate control unit is seeing an open-type problem in the mode control motor circuit.
Article vehicle: 2010-2017 Honda Accord 2.4 Gas
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B121A: B121A Diagnostic Guide
Vehicle-specific published guides for this diagnostic trouble code.
An Open in the Mode Control Motor Circuit
B121A may indicate an open in the climate control mode control motor circuit.
Article vehicle: 2010-2015 Honda Civic 1.8 Gas
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— Climate Control Unit
B121A may indicate that the climate control unit is not seeing the expected feedback from the mode control motor circuit.
Article vehicle: 2010-2016 Honda Cr V 2.4 Gas
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— An Open in the Mode Control Motor Circuit
B121A may indicate an open or abnormal signal condition in the climate control mode control motor circuit.
Article vehicle: 2016-2024 Honda Civic 1.5TurboGas
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Climate Control Mode Control Motor Circuit
B121A may indicate the climate control unit is seeing an unexpected mode control motor circuit signal.
Article vehicle: 2020-2025 Honda Cr V 2.0Hybrid
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— possible open in the mode control motor circuit
B121A may indicate that the climate control unit is seeing an abnormal mode control motor signal, often described as a possible open-circuit type fault in that control path.
Article vehicle: 2016-2024 Honda Civic 2.0 Gas
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Mode Control Motor Circuit Open
B121A may mean the climate control unit is seeing a mode control motor feedback signal that is higher than expected.
Article vehicle: 2017-2025 Honda Cr V 1.5TurboGas
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