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P codepowertrainMedium severity

P0332Knock Sensor 2 Circuit Low Input (Bank 2)

The Bank 2 knock sensor circuit is reading below its minimum voltage threshold, usually from a shorted or corroded circuit or a dead sensor.

Definition

The PCM biases the Bank 2 knock sensor circuit and sets P0332 when the input stays below the calibrated low limit — the Bank 2 counterpart to P0327 — indicating a short to ground, an open element, or heavy corrosion. The PCM retards ignition timing as a safeguard, so drivers notice soft acceleration and reduced fuel economy with the MIL on. On engines with valley-mounted sensors under the intake manifold (a common GM V8 layout), coolant seepage into the sensor wells is a leading cause of this exact code.

Common causes

  • Failed Bank 2 knock sensor (open or shorted element)
  • Coolant or water intrusion into the sensor well and connector (valley-mounted sensors)
  • Signal wire shorted to ground or open in the harness
  • Corroded terminals in the sensor or PCM connector
  • Damaged shielded cable or broken shield ground
  • PCM bias/input fault (rare)

Common misdiagnoses

  • Sensor replaced without sealing the water/coolant intrusion that caused the failure
  • Bank 1 sensor replaced due to bank confusion
  • PCM replaced when the harness is shorted to ground
  • Fuel or ignition service performed for the fallback-timing symptoms

Troubleshooting steps

  1. 1.Check the bias voltage at the Bank 2 sensor connector

    Unplug the sensor with key on — a normal bias (about 2-2.5 V on many systems) at the harness means the sensor is dead; near 0 V means a harness short or PCM fault.

  2. 2.Look for fluid intrusion

    On valley-mounted designs, remove the intake covers and check for standing coolant around the sensor and wicking corrosion up the pigtail.

  3. 3.Test the sensor element

    Compare the sensor's resistance to the service specification and tap-test it on the bench with a scope — a dead element produces no AC burst.

  4. 4.Isolate the harness run

    With both ends disconnected, confirm end-to-end continuity and infinite resistance to ground; repair chafes where the loom crosses the block or manifold.

  5. 5.Reinstall to torque and verify

    Torque the sensor to specification, clear the code, and confirm knock-sensor activity and full timing advance return during a loaded road test.

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