P0332 – Knock Sensor 2 Circuit Low Bank 2

Last updated: April 4, 2026

DTC P0332 is an ISO/SAE controlled powertrain code that identifies a circuit low condition in the Knock Sensor 2 circuit on Bank 2. In practical terms, the engine control module (ECM/PCM) is detecting that the electrical signal for Knock Sensor 2 on the Bank 2 side is lower than the expected range for the required amount of time. Because knock sensors are part of the ignition timing protection strategy, this matters even when the vehicle seems to run “mostly fine.” When the circuit signal is pulled low, the module may limit how it uses knock feedback, which can affect performance, fuel economy, and how confidently the engine can run under load. The correct repair approach starts with circuit testing, not guessing.

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P0332 Quick Answer

P0332 – Knock Sensor 2 Circuit Low Bank 2 means the control module has detected a low-voltage (pulled-down) condition in the Knock Sensor 2 electrical circuit on Bank 2. Focus first on wiring and connector faults that can drag the signal low (short-to-ground, moisture intrusion, terminal damage), then verify the sensor only after the circuit checks good.

What Does P0332 Mean?

Official meaning: Knock Sensor 2 Circuit Low Bank 2. This code sets when the vehicle’s control module identifies that the electrical circuit for Knock Sensor 2 on Bank 2 is operating at a lower signal level than it. The key detail is the fault type: Circuit Low. That points to an electrical condition (signal pulled toward ground, excessive leakage, or an abnormal low bias/signal) rather than automatically proving the sensor itself is defective.

Although the exact enable criteria and thresholds vary by application, the diagnostic intent is consistent: the module monitors the knock sensor circuit and expects a usable signal range. If the circuit stays low beyond what the module considers plausible, it stores P0332. The correct interpretation is “the circuit is low,” not “the engine is knocking” and not “the sensor is definitely bad.”

Theory of Operation

A knock sensor is designed to generate an electrical signal in response to engine vibration characteristics associated with combustion knock. The control module uses the knock sensor input to help manage ignition timing under different operating conditions. When the input is reliable, the module can react to knock-related vibration by adjusting timing, helping protect the engine while maintaining performance.

For circuit monitoring, the module evaluates the knock sensor circuit for a signal that remains within expected electrical limits. A circuit low condition typically occurs when the signal line is pulled down electrically (for example, by a short to ground, water intrusion creating a conductive path, damaged insulation, or an internal fault that effectively drags the circuit low). Because the diagnostic is circuit-focused, the most productive diagnostic path is to prove whether the wiring/connector is forcing the circuit low before replacing the sensor.

Symptoms

• Malfunction indicator lamp (MIL) / check engine light illuminated
• Reduced engine power or diminished acceleration in certain conditions
• Hesitation or unstable response during heavier throttle inputs
• Potential decrease in fuel economy due to altered ignition timing strategy
• Engine may feel less responsive under load compared with normal operation
• Additional knock sensor-related circuit codes may be present depending on strategy

Common Causes

• Short-to-ground in the Knock Sensor 2 signal circuit on Bank 2
• Connector moisture intrusion or corrosion creating leakage that pulls the circuit low
• Damaged, pinched, or chafed harness causing the signal to be dragged low
• Poor terminal fit (spread terminals, backed-out pins) causing abnormal circuit behavior
• Knock Sensor 2 internal electrical fault that results in consistently low output
• Control module input circuit issue (verify only after the circuit and sensor test correctly)

Diagnosis Steps

Tools you’ll need: a scan tool capable of reading stored/pending codes and freeze-frame data, a DVOM (digital volt/ohm meter), back-probing tools or appropriate test leads, and an accurate wiring diagram identifying Knock Sensor 2 and Bank 2 circuit routing and terminals. Basic hand tools may be required for access to connectors and harness routing points.

1. Confirm the code and capture data: Verify P0332 is present (stored and/or pending). Record freeze-frame data and note engine speed, load, temperature, and battery voltage at the time of the fault.
2. Check for related DTCs: Scan for other powertrain codes that could influence diagnosis (for example, additional knock sensor circuit codes or power/ground related codes). Address foundational power/ground issues first if present.
3. Perform a targeted visual inspection: Inspect the Bank 2 Knock Sensor 2 harness routing from the sensor toward the main harness and toward the control module. Look for melted insulation, chafing, pinch points, oil saturation, and contact with hot or sharp surfaces.
4. Inspect the sensor connector closely: Disconnect the Knock Sensor 2 connector and check for water intrusion, corrosion, damaged locks, bent pins, or terminals that appear spread or recessed. Repair connector issues before deeper electrical testing.
5. Clear codes and evaluate return behavior: Clear DTCs and key-cycle as appropriate. Determine whether P0332 returns immediately (suggesting a hard electrical pull-down) or only after operating conditions are met (suggesting an intermittent circuit fault).
6. Check for short-to-ground on the signal circuit: With the circuit safely isolated as directed by the wiring diagram, measure resistance between the Knock Sensor 2 signal wire and engine ground. A low resistance reading indicates a short or leakage path that can create a circuit-low condition.
7. Verify circuit integrity end-to-end: Use the wiring diagram to confirm continuity of the Knock Sensor 2 signal and return circuits between the sensor connector and the control module connector. If continuity is present, continue testing for intermittent opens or resistance concerns (wiggle testing while monitoring readings).
8. Perform loaded electrical checks where applicable: If the service information supports it, perform a load-sensitive check (not just static continuity) to identify high resistance or intermittent faults that can collapse the circuit under vibration, heat, or movement.
9. Evaluate the sensor only after circuit checks: If wiring/connector testing shows no short-to-ground, no abnormal resistance, and no terminal concerns, test Knock Sensor 2 per service information. Replace the sensor only if it fails testing or is confirmed to be the source of the circuit-low condition.

Professional tip: Because P0332 is explicitly a circuit low code, prioritize tests that prove whether the circuit is being electrically pulled down (short-to-ground or leakage through moisture/corrosion). Replacing the sensor before confirming the circuit is not pulled low can leave the root cause untouched.

Possible Fixes

• Repair or replace damaged wiring in the Knock Sensor 2 (Bank 2) circuit that is shorted to ground
• Clean, dry, and restore connector integrity (repair terminals, remove corrosion, correct pin fit) at the knock sensor connection
• Repair harness routing or secure the loom to eliminate chafing/pinching that can pull the circuit low
• Replace Knock Sensor 2 only after circuit testing confirms the wiring and connector are not causing the low condition
• Repair control module-side connector or terminal damage if verified by pinpoint testing

Can I Still Drive With P0332?

You may be able to drive with P0332, but it should be treated as a condition that can affect how the engine manages ignition timing under load. Since the code indicates Knock Sensor 2 Circuit Low Bank 2, the control module may not be receiving a valid signal from that circuit and may adjust its strategy accordingly. Avoid heavy acceleration and sustained high-load driving until the fault is diagnosed and corrected. If driveability deteriorates significantly or additional warning signs appear, the vehicle should be inspected promptly.

How Serious Is This Code?

P0332 is potentially serious because it involves the circuit used for knock detection feedback. A circuit-low condition can prevent the control module from using accurate knock sensor input from Knock Sensor 2 on Bank 2, which may lead the module to use a protective strategy that can reduce performance or efficiency. The seriousness depends on how the vehicle responds and whether the circuit low is constant or intermittent, but the correct approach is to address the electrical cause so the system can function as designed.

Common Misdiagnoses

The most frequent misstep with P0332 is treating it as a guaranteed failed sensor and replacing Knock Sensor 2 without proving the circuit is not being pulled low. Because the fault type is Circuit Low, wiring damage, moisture intrusion, corrosion, or terminal problems are primary suspects. Another misdiagnosis is confusing bank and sensor numbering; the code is specific to Knock Sensor 2 on Bank 2, so component identification must match the service information for the engine configuration.

Most Likely Fix

The most likely successful repair direction for P0332 is correcting the electrical circuit low condition in the Knock Sensor 2 circuit on Bank 2—most often by repairing wiring/connector issues that pull the signal low (short-to-ground, corrosion, moisture intrusion, or damaged terminals). Replace Knock Sensor 2 only after verifying that the harness and connectors are electrically sound and the circuit is not being forced low by external faults.

Repair Costs

Repair cost depends on whether the confirmed root cause is a sensor, wiring, connector issue, or control module problem. Verify the fault electrically before replacing parts.