P2375 – Knock Sensor 2 Circuit Range/Performance (Bank 2)

System: Powertrain | Standard: ISO/SAE Controlled | Fault type: Range/Performance | Location: Bank 2, Sensor 2

Definition source: SAE J2012/J2012DA (industry standard)

DTC P2375 indicates the powertrain control module has detected a Range/Performance problem in the Knock Sensor 2 circuit on Bank 2. “Range/Performance” points to a signal that is present but not behaving as expected—such as being implausible, biased, slow to respond, or not correlating with related operating conditions—rather than a simple open, short-to-ground, or short-to-power. How and when the code sets can vary by vehicle, so confirm the exact enabling conditions, connector views, and test specifications in the appropriate service information before diagnosing.

What Does P2375 Mean?

P2375 means the control module has identified a Knock Sensor 2 Circuit Range/Performance (Bank 2) condition. In practical diagnostic terms, the module is monitoring the knock sensor’s circuit signal and determining it is outside an expected operating pattern for current engine conditions, yet not necessarily completely missing. SAE J2012 defines how DTCs are structured and named, but the meaning here is strictly the official definition: the issue is a range/performance fault affecting Knock Sensor 2 on Bank 2, and it must be confirmed with targeted circuit and signal checks.

Quick Reference

  • System: Powertrain
  • Official meaning: Knock Sensor 2 Circuit Range/Performance (Bank 2)
  • Standard: ISO/SAE controlled
  • Fault type: Range/Performance
  • Severity: The MIL may illuminate and the module may alter ignition timing strategies, which can affect drivability and engine performance depending on operating conditions.

Symptoms

  • MIL/Check engine light: Lamp illuminated and P2375 stored as current or pending.
  • Reduced performance: Noticeable loss of power if ignition timing is adjusted as a precaution.
  • Poor acceleration: Slower response under load, especially during passing or hill climbs.
  • Roughness: Intermittent rough running or hesitation that may correlate with load changes.
  • Fuel economy: Decreased efficiency if timing is retarded or protective strategies are active.
  • Intermittent behavior: Symptoms may come and go, especially with vibration, heat soak, or harness movement.

Common Causes

  • Connector issues at Knock Sensor 2: Loose seating, corrosion, moisture intrusion, poor pin fit, or terminal fretting that distorts the signal.
  • Harness damage: Chafed, pinched, melted, or oil-soaked wiring between Knock Sensor 2 (Bank 2) and the engine control module causing signal distortion under vibration.
  • High resistance in signal/return circuits: Partially broken conductors, corrosion in splices, or degraded terminals that skew sensor output and trigger a range/performance evaluation.
  • Ground/reference integrity problems: Poor ground path or reference issues (varies by vehicle design) that prevent the knock sensor signal from responding as expected.
  • Improper mounting or coupling: Sensor not properly torqued/secured to its mounting surface, or mounting surface contamination, reducing signal fidelity and response.
  • Knock Sensor 2 degraded or incorrect: Sensor internal aging, damage, or an incorrect part that produces a biased or slow response without being fully open/shorted.
  • Engine mechanical noise/vibration influence: Abnormal mechanical noise that can overwhelm or confuse knock detection logic and lead to a range/performance judgment (must be confirmed by inspection).
  • Control module or software-related plausibility behavior: Less common; controller input conditioning, calibration, or internal fault affecting how the signal is interpreted (verify only after circuit and sensor checks).

Diagnosis Steps

Tools helpful for diagnosing P2375 include a scan tool capable of reading freeze-frame data and logging live data, a multimeter for resistance and voltage-drop testing, and access to factory service information for connector pinouts and test procedures. Basic hand tools for connector inspection and sensor access are also useful. An oscilloscope can help evaluate signal behavior, but it is optional and vehicle-dependent.

  1. Confirm the code and capture context: Scan for P2375 and any related powertrain DTCs. Save freeze-frame and note operating conditions (load, RPM, temperature) when the fault set, since range/performance faults are often condition-dependent.
  2. Verify bank and sensor identification: Using service information, confirm the location of Bank 2 and which physical unit is Knock Sensor 2. Misidentification can waste time and lead to unnecessary parts replacement.
  3. Check for obvious mechanical contributors: Perform a quick under-hood inspection for loose heat shields, brackets, or contact points that can introduce abnormal vibration. Do not assume a mechanical problem is present; just rule out clear issues that could influence knock-signal plausibility.
  4. Inspect the sensor and connector condition: With ignition off (and battery precautions per service info), inspect Knock Sensor 2 and its connector for oil contamination, corrosion, damaged seals, bent pins, and poor terminal tension. Correct any connector issues before deeper testing.
  5. Inspect the harness routing: Follow the harness from the sensor toward the controller as far as practical. Look for pinch points, abrasion, melted insulation near hot components, and prior repair splices. Repair wiring defects using methods appropriate for the environment (heat, vibration, and fluids).
  6. Perform a wiggle test with live-data logging: Monitor relevant scan PIDs (varies by vehicle, e.g., knock sensor activity/retard indications) while gently moving the connector and harness in sections. Log data to capture intermittent spikes, dropouts, or non-responsive behavior that can trigger range/performance faults.
  7. Check circuit integrity with key off: Using the correct pinout, verify continuity between the sensor connector and the controller connector, and check for unwanted continuity to power or ground where not expected. Focus on finding intermittent opens/high resistance rather than only hard shorts, since P2375 is a range/performance type fault.
  8. Voltage-drop test the circuit under load: Where service procedures allow, perform voltage-drop testing across suspect connectors/splices/grounds while the circuit is active to identify excessive resistance that may not appear in a static ohms check. Compare results side-to-side only if the design supports comparison, and follow service info for the correct method.
  9. Verify sensor installation and mounting: Check that the sensor is properly seated and secured, and that the mounting surface is clean and appropriate. Correct mounting and torque are important because poor coupling can produce a weak or skewed response that fails plausibility checks.
  10. Evaluate sensor response and plausibility: If available and safe per service guidance, use scan-tool active tests or controlled operating conditions to observe whether Knock Sensor 2 responds plausibly compared to expected behavior. An oscilloscope can help determine whether the signal is noisy, biased, or sluggish rather than cleanly absent/present.
  11. Clear codes and run a verification drive: After repairs or adjustments, clear DTCs and perform a drive cycle or test procedure that matches the freeze-frame conditions. Re-scan for pending and confirmed codes and confirm the repair with a repeatable result.

Professional tip: Treat P2375 as a signal quality/plausibility problem first. If the circuit passes basic continuity checks, prioritize connector terminal tension, corrosion, harness vibration points, and sensor mounting/torque verification, then confirm the fix with a live-data log during the same operating conditions that originally set the code.

Need wiring diagrams and factory-style repair steps?

Powertrain faults often require exact wiring diagrams, connector pinouts, and guided test steps. A repair manual can help you confirm the cause before replacing parts.

Factory repair manual access for P2375

Check repair manual access

Possible Fixes & Repair Costs

Repair costs for P2375 vary widely because the root cause can range from a simple connection issue to wiring repairs or component replacement. Total cost depends on the time required to confirm the fault with testing, parts accessibility, and labor rates.

  • Repair wiring faults: Restore damaged, pinched, or chafed wiring in the Knock Sensor 2 circuit for Bank 2, then secure routing to prevent re-contact with heat or moving parts.
  • Clean and secure connectors: Address corrosion, moisture, poor terminal tension, or partial connector engagement at the sensor and control module side; verify proper pin fit and locking.
  • Correct power/ground integrity issues: Repair shared grounds, ground eyelets, or harness splices that create unstable sensor signal behavior; confirm with voltage-drop testing under load.
  • Replace Knock Sensor 2 (Bank 2) if confirmed: Replace the sensor only after tests show the sensor response is out of expected range/performance and the circuit integrity is verified.
  • Address mechanical contributors if verified: If testing confirms true abnormal knock/vibration is influencing sensor behavior, correct the underlying condition (varies by vehicle) before clearing the DTC.
  • Update/repair related hardware as applicable: If service information calls out related harness sections, shields, brackets, or mounting surfaces that affect signal plausibility, repair/replace as needed.

Can I Still Drive With P2375?

You can sometimes drive with P2375, but it is not ideal because knock input accuracy can affect how the powertrain manages ignition timing and engine protection strategies. If you notice reduced power, significant hesitation, abnormal engine noise, overheating, flashing malfunction indicator lamp behavior, or any safety-critical warnings (loss of power, stalling, brake/steering warnings), do not continue driving—have the vehicle inspected and diagnosed first.

What Happens If You Ignore P2375?

Ignoring P2375 can lead to ongoing incorrect knock detection behavior, which may cause persistent drivability issues and inefficient operation. Depending on vehicle strategy, the powertrain may use conservative timing or limited performance to protect the engine, and prolonged operation without resolving the underlying range/performance issue can increase the chance of additional fault codes and potential component stress.

Compare nearby knock range/performance trouble codes with similar definitions, fault patterns, and diagnostic paths.

  • P2371 – Knock Sensor 1 Circuit Range/Performance (Bank 1)
  • P2388 – Turbocharger Boost Sensor Control Range/Performance
  • P2383 – Turbocharger Boost Pressure Sensor A/B Range/Performance
  • P2368 – Boost Pressure Sensor Circuit Range/Performance
  • P0525 – Cruise Control Servo Control Circuit Range/Performance
  • P051B – Crankcase Pressure Sensor Circuit Range/Performance

Key Takeaways

  • P2375 is a range/performance fault: It indicates the Knock Sensor 2 circuit signal on Bank 2 is not behaving plausibly, not automatically that the sensor is bad.
  • Verify wiring and connections first: Connector fit, corrosion, harness damage, and ground integrity are common root causes for plausibility problems.
  • Test before replacing parts: Confirm the fault with inspections, voltage-drop checks, and live-data logging rather than guessing.
  • Vehicle strategy varies: Some platforms may reduce performance or alter timing when knock input is unreliable.
  • Address contributors: If abnormal vibration/knock is verified, correct the underlying condition so the signal returns to expected behavior.

Vehicles Commonly Affected by P2375

  • Vehicles with V-type engines: Bank-specific monitoring is common where Bank 2 is defined by engine layout.
  • Engines using multiple knock sensors: “Knock Sensor 2” typically indicates more than one sensor is used for coverage.
  • Applications with harnesses routed near heat sources: Higher likelihood of insulation damage and connector degradation over time.
  • Vehicles with under-engine splash exposure: Moisture intrusion can affect connector terminals and sensor signal quality.
  • Higher-compression or forced-induction applications: Often rely heavily on accurate knock input for timing control (design varies by vehicle).
  • Vehicles with recent engine or intake service: Disturbed connectors, pinched wiring, or missed fasteners can affect signal plausibility.
  • High-mileage vehicles: Aging wiring, brittle insulation, and ground point corrosion can cause range/performance faults.
  • Vehicles operating in harsh environments: Frequent thermal cycling, vibration, and road contaminants can degrade circuit integrity.

FAQ

Does P2375 mean Knock Sensor 2 (Bank 2) is bad?

No. P2375 indicates a Knock Sensor 2 circuit range/performance condition on Bank 2, meaning the signal is implausible or not responding as expected. Wiring issues, connector problems, grounding faults, or abnormal vibration can also trigger it, so testing is required before replacing parts.

Can a wiring problem cause a range/performance code like P2375?

Yes. High resistance, poor terminal tension, corrosion, damaged shielding, or intermittent opens can distort or destabilize the sensor signal in ways that appear as an out-of-range or poor-performance condition rather than a simple “open” or “high/low” fault.

Will P2375 always turn on the malfunction indicator lamp?

Not always. Some vehicles may store P2375 as a pending or history code until it repeats under similar operating conditions. Whether the lamp illuminates depends on the platform’s monitoring strategy and how frequently the fault is detected.

What’s the difference between “Range/Performance” and “Circuit High/Low” for knock sensor codes?

Range/performance focuses on plausibility and expected response of the signal (for example, a skewed or non-responsive pattern), while circuit high/low generally indicates an electrical condition consistent with a short-to-power or short-to-ground. P2375 is specifically a range/performance type fault.

After repairs, what should I do to confirm P2375 is fixed?

Clear the code, then perform a verification drive while logging relevant scan tool data to confirm the knock sensor signal behaves consistently and the monitor completes without returning P2375. Also recheck the repaired connectors and harness routing to ensure the issue does not reoccur.

For the most reliable outcome, confirm the repair with a complete drive cycle and a post-test inspection of the Knock Sensor 2 (Bank 2) circuit routing, connector security, and ground integrity.