How much does it cost to fix P0330?

DIY repair typically costs $25–$100 for parts. Professional repair runs $150–$450 including parts and labor.

P0330

Powertrain

Low

Knock Sensor 2 Circuit Malfunction (Bank 2)

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The P0330 code indicates a malfunction in the Knock Sensor 2 circuit on Bank 2. This code only appears on engines with two knock sensors, which typically means V6, V8, or other multi-bank engine configurations. Bank 2 is the side of the engine that does not contain cylinder 1.

The knock sensor monitors for abnormal combustion (detonation) and allows the ECM to retard ignition timing to prevent engine damage. When this circuit malfunctions, the ECM loses its ability to detect knock on the Bank 2 cylinders and will default to a conservative timing strategy, resulting in slightly reduced power and fuel economy.

One of the most commonly overlooked causes of P0330 is rodent damage to the knock sensor wiring. The wires run along the engine block where they're exposed to heat and rodents, making them vulnerable. Before replacing the sensor, carefully inspect the entire wiring harness for chew marks, fraying, or corrosion. On many V6 and V8 engines (especially Toyota and Nissan), the knock sensors are located under the intake manifold, which makes this a labor-intensive repair at a shop but still doable for an experienced DIYer.

Severity

Low — MonitorThis Month

Symptoms

•Check Engine light is on
•Slight reduction in engine power
•Possible pinging or knocking noise from the engine
•Marginally decreased fuel economy
•Engine may feel slightly sluggish under hard acceleration

Likely Causes

Faulty knock sensor 240%

The Bank 2 knock sensor has failed due to heat exposure or age, sending an incorrect or absent signal to the ECM.

Damaged or corroded wiring30%

The wiring harness or connector to the Bank 2 knock sensor is damaged, corroded, or disconnected. Rodent damage to wiring is a leading cause of this code.

Improper sensor mounting15%

The sensor is loose, improperly torqued, or the mounting surface is contaminated, preventing proper vibration detection on Bank 2.

ECM or PCM malfunction10%

The engine control module may have an internal fault or calibration issue affecting its ability to read the Bank 2 knock sensor signal.

Engine mechanical issue on Bank 25%

Carbon buildup, overheating, or mechanical wear on the Bank 2 cylinders may be causing abnormal vibrations that overwhelm the sensor.