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P codepowertrainMedium severity

P0330Knock Sensor 2 Circuit Malfunction (Bank 2)

The Bank 2 knock sensor circuit has a general malfunction — the PCM is not receiving a usable knock signal from that side of the engine.

Definition

On V-configuration engines, each bank typically has its own knock sensor; P0330 is the Bank 2 equivalent of P0325 and sets when that sensor's circuit fails in a way that does not fit a more specific low/high/range subcode. Without knock feedback from Bank 2, the PCM retards ignition timing across the board as protection, so expect reduced power and fuel economy with the MIL illuminated. The engine remains driveable, but hard driving on low-octane fuel risks undetected detonation on the unmonitored bank.

Common causes

  • Failed Bank 2 knock sensor
  • Open, shorted, or chafed wiring between the sensor and PCM
  • Corroded connector or coolant/water intrusion at the sensor (valley-mounted designs)
  • Loose or overtightened sensor mounting
  • Poor shield ground introducing noise
  • PCM input fault (rare)

Common misdiagnoses

  • Bank 1 sensor replaced because of confusion over bank identification
  • Both sensors replaced when only the Bank 2 harness is damaged
  • Ignition or fuel components replaced for fallback-timing sluggishness
  • PCM replaced before circuit testing

Troubleshooting steps

  1. 1.Positively identify Bank 2

    Bank 2 is the cylinder-head side that does NOT contain cylinder 1 — verify with the service manual before touching parts, as bank mix-ups waste sensors.

  2. 2.Inspect the sensor and harness

    Check the connector for corrosion and the loom for chafing against the block, manifold, or bellhousing; valley-mounted sensors should be checked for standing coolant.

  3. 3.Test circuit integrity

    With both ends disconnected, verify signal-wire continuity to the PCM (under 1 Ω) and infinite resistance to ground and to other circuits.

  4. 4.Compare sensor resistance and output to Bank 1

    Measure both sensors and tap-test each with a scope; the two channels should behave nearly identically on a healthy engine.

  5. 5.Replace the sensor with correct torque

    If the circuit is proven and the Bank 2 sensor is dead, install a new one torqued to specification (typically 15-25 Nm) — torque errors cause repeat range codes.

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