Drive with caution — fix soon.
This code means the voltage from the bank 2 knock sensor circuit is lower than expected, often pointing to an open or shorted wire, a bad connection, or a failed sensor. Because the computer can't trust the sensor, it usually defaults to a safer, more conservative ignition timing. The typical fix is repairing the wiring or connector and replacing the knock sensor if needed.
$150 – $400
Varies by vehicle and root cause.
Usually yes for the short term. The car remains drivable, though it may feel a touch less powerful. Get it diagnosed soon and avoid aggressive acceleration in the meantime.
Most repairs land between $150 and $400. If it's just a wiring or connector fix, it can be on the lower end; replacing a sensor buried under the intake manifold pushes it higher.
It's moderate. There's no immediate danger of breakdown, but without a working knock sensor the engine runs more conservatively and isn't fully protected against detonation, so it's worth addressing.
A low input usually means the signal voltage has dropped too far, often from a broken or shorted wire, a corroded connector, or a sensor that has failed. A technician will test the circuit to pinpoint which it is.