DTC code
Vehicle-specific published guides for this diagnostic trouble code.
B12D1 may indicate that the keyless access power control unit is seeing an ignition relay circuit state that does not match what it expects.
Article vehicle: 2010-2017 Honda Accord 2.4 Gas
Read diagnostic guide
B12D1 may mean the keyless access power control unit is seeing the IG1B ignition power circuit behave differently than expected.
Article vehicle: 2010-2015 Honda Civic 1.8 Gas
Read diagnostic guide
B12D1 may indicate that the body control module is seeing a difference between the ON state it expects and the actual IG1B holding circuit condition.
Article vehicle: 2016-2024 Honda Civic 1.5TurboGas
Read diagnostic guide
B12D1 may mean the body control module sees a difference between the ignition ON state it is commanding or tracking and the actual IG1B holding circuit condition.
Article vehicle: 2020-2025 Honda Cr V 2.0Hybrid
Read diagnostic guide
B12D1 may mean the body control module sees a difference between the ignition ON state it expects and the actual IG1B holding circuit feedback.
Article vehicle: 2016-2024 Honda Civic 2.0 Gas
Read diagnostic guide
B12D1 may mean the body control module is seeing a mismatch between the commanded power mode state and the actual IG1B holding circuit response.
Article vehicle: 2017-2025 Honda Cr V 1.5TurboGas
Read diagnostic guide