P0334 — Knock Sensor 2 Circuit High Input (Bank 2)
Drive with caution — fix soon.
What P0334 means
This code means the voltage in the bank 2 knock sensor circuit is reading higher than normal, which usually points to a wiring short to voltage, a connector problem, or a faulty sensor. With an untrustworthy signal, the computer falls back on a more conservative ignition timing to avoid engine damage. The typical fix is inspecting and repairing the wiring and connector and replacing the knock sensor if it has failed.
Common symptoms
- Check engine light is on
- Slight reduction in engine power
- Decreased fuel economy
- Possible knocking or pinging sounds
- Engine feels less responsive under acceleration
Common causes
- Short to voltage in the sensor wiring
- Failed knock sensor on bank 2
- Faulty or corroded electrical connector
- Damaged wiring harness near the sensor
- Engine control module fault (rare)
Typical repair cost
$150 – $400
Varies by vehicle and root cause.
Frequently asked questions
Can I keep driving with a P0334 code?
Usually yes, for short trips. The engine may run slightly more conservatively, but it's safe to drive to a shop. Avoid hard acceleration and get it diagnosed before too long.
How much does it cost to fix a P0334 code?
Most repairs cost between $150 and $400. A simple wiring or connector repair is cheaper, while replacing a sensor located under the intake manifold raises the labor cost.
Is a P0334 code serious?
It's moderate. The car won't break down right away, but the engine can't fine-tune timing without a reliable knock sensor, which can slowly affect performance and economy. It's best to fix it rather than wait.
What does high input mean on a knock sensor circuit?
High input means the circuit voltage is reading above the expected range, often from a wire shorted to a power source or a bad connector. A technician will check the wiring and sensor to find the cause.