P2376 – Knock Sensor 2 Circuit Low (Bank 2)

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

Definition source: SAE J2012/J2012DA (industry standard)

DTC P2376 indicates the powertrain control system has detected a low electrical signal condition in the Knock Sensor 2 circuit on Bank 2. This is a circuit-level fault, meaning the module is seeing the sensor signal lower than expected, rather than directly confirming a mechanical engine knock problem. How the code is monitored, what inputs are compared, and what symptoms appear can vary by vehicle, engine layout, and control strategy. Always verify wiring diagrams, connector views, pin functions, and test specifications in the applicable service information before testing or replacing parts.

What Does P2376 Mean?

P2376 – Knock Sensor 2 Circuit Low (Bank 2) means the control module has detected a “circuit low” condition on the signal path associated with Knock Sensor 2 for Bank 2. Per SAE J2012 DTC conventions, this points to an electrical low-input situation (such as a short to ground, loss of feed/reference, or excessive voltage drop due to high resistance) affecting the sensor circuit, its wiring, or the module interface. The code describes the observed circuit signal state; it does not, by itself, prove the sensor is defective or that engine knock is present.

Quick Reference

  • System: Powertrain
  • Official meaning: Knock Sensor 2 Circuit Low (Bank 2)
  • Standard: ISO/SAE controlled
  • Fault type: Circuit Low
  • Severity: MIL may illuminate; reduced knock detection capability can affect performance and drivability, and some strategies may limit power to protect the engine.

Symptoms

  • MIL/Check engine: Malfunction indicator lamp illuminated; code stored as current or history.
  • Reduced power: Engine may enter a protective torque reduction or limited performance mode depending on strategy.
  • Poor acceleration: Sluggish response, especially under load, if ignition timing is adjusted conservatively.
  • Roughness: Hesitation, stumble, or uneven power delivery may be noticed during acceleration.
  • Abnormal spark control: Live data may show knock-related timing behavior that appears fixed, overly retarded, or not responding as expected.
  • Intermittent behavior: Symptoms may come and go with vibration, heat, moisture, or harness movement.

Common Causes

  • Short-to-ground on the signal circuit: Chafed insulation or pinched harness pulling the knock sensor 2 signal low.
  • Low reference/biased signal due to high resistance: Corrosion, moisture intrusion, or damaged terminals causing excessive voltage drop and a low-input reading.
  • Poor connector fit: Spread pins, partially seated connector, broken lock, or fretting leading to unstable contact and low signal.
  • Power/feed or bias circuit issue (varies by vehicle): A missing or weak feed/biased reference to the sensor circuit can force the signal low.
  • Ground circuit problem (shared grounds): High resistance or unintended ground path on a shared ground circuit influencing sensor signal level.
  • Sensor internal fault: Knock Sensor 2 (Bank 2) internally shorted or electrically degraded, producing a persistently low signal.
  • Harness routing/heat damage: Heat-soak, abrasion, or contact with sharp edges causing intermittent or permanent low input.
  • Control module or input circuit fault: Rare, but an internal fault in the receiving circuit can interpret a normal signal as low after wiring and sensor are proven good.

Diagnosis Steps

Tools that help include a scan tool with live data and freeze-frame access, a digital multimeter, and back-probing leads. A wiring diagram and connector views for your exact vehicle are essential because knock-sensor circuits and pinouts vary. If available, use breakout leads to avoid damaging terminals, and have basic hand tools to access connectors and inspect harness routing.

  1. Confirm the code and capture data: Scan for P2376 and record freeze-frame information and any companion powertrain codes. Clear codes only after saving data, then see if P2376 resets immediately or after a drive cycle.
  2. Verify bank and sensor identification: Using service information, confirm which sensor is “Knock Sensor 2” and where Bank 2 is located. Misidentifying the sensor or bank can lead to testing the wrong circuit.
  3. Perform a thorough visual inspection: With the engine off, inspect the sensor connector, harness, and routing to the control module. Look for rubbing, pinching, heat damage, oil contamination, corrosion, water intrusion, and signs of prior repairs.
  4. Check connector integrity: Disconnect the knock sensor 2 connector and inspect terminal tension, pin fit, locking tabs, and signs of fretting. Repair/replace damaged terminals as needed and ensure the connector fully seats.
  5. Wiggle test while monitoring live data: Reconnect and monitor the knock sensor 2 parameter(s) or related knock/retard data on the scan tool. Wiggle the harness and connector gently from the sensor toward the main harness and module; note any sudden drops that suggest an intermittent short-to-ground or poor contact.
  6. Key-on electrical checks (consult specs): With key on (engine off), use the wiring diagram to identify the signal, ground, and any feed/bias/reference circuits (varies by vehicle). Measure for the expected presence of the circuit feed/bias and confirm the ground path is intact per service information. A missing feed/bias or a pulled-low signal indicates a circuit issue rather than a mechanical engine problem.
  7. Check for short-to-ground on the signal circuit: With the sensor unplugged and the control module connector accessed as required, test the sensor signal circuit for continuity to ground. A low-resistance path suggests insulation damage or a pinched harness shorting the circuit low.
  8. Check for opens/high resistance end-to-end: Measure continuity of the signal and ground circuits between the sensor connector and the control module connector. If continuity exists but the circuit still reads low in operation, suspect high resistance at terminals or splices and proceed to voltage-drop testing.
  9. Voltage-drop test under load: With the circuit connected and operating conditions met per service info, perform voltage-drop testing across suspect connectors, splices, and ground points. Excessive drop indicates resistance that can pull the sensor input low even when continuity appears acceptable.
  10. Isolate sensor versus harness: If wiring checks good and no short-to-ground is found, follow service information to verify the sensor’s electrical behavior using approved test methods. If the signal remains low with verified good circuits, the sensor is more likely at fault; if the signal normalizes when bypassing/repairing a section, the harness/connector was the cause.
  11. Consider control module input only after proving the basics: If the sensor and wiring are verified and the fault persists, follow service information for module-side pin checks and any required confirmatory tests. Module replacement or reprogramming should be the last step after all circuit faults are eliminated.

Professional tip: Don’t rely on continuity checks alone for a circuit-low complaint. A connector with minor corrosion can pass continuity yet create enough resistance to pull a biased sensor input low when the circuit is active. Use a combination of live-data logging, wiggle testing, and voltage-drop testing to catch load-sensitive faults before replacing parts.

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Factory repair manual access for P2376

Check repair manual access

Possible Fixes & Repair Costs

Repair cost for P2376 varies widely because the root cause can be anywhere from a simple connector issue to wiring repairs or component replacement. Total time and parts depend on access to the sensor location, harness routing, and what testing confirms.

  • Repair wiring damage: Restore insulation, repair broken conductors, and correct routing/chafe points in the Knock Sensor 2 (Bank 2) circuit.
  • Clean and secure connectors: Remove corrosion/contamination, ensure full terminal engagement, and correct poor pin fit that can pull the signal low under load.
  • Restore power/ground integrity: Fix opens or excessive resistance in shared feeds/grounds that cause low input to the control module during operation.
  • Address short-to-ground: Locate and eliminate any shorted signal wire, rubbed-through harness, or internally shorted component pulling the circuit low.
  • Replace Knock Sensor 2 (Bank 2): Replace only after testing confirms the sensor is the source of the low circuit condition.
  • Repair control module connector issues: Correct spread terminals, water intrusion, or harness tension at the module connector that can create a low signal condition.
  • Relearn/verification drive: After repairs, clear codes and confirm the circuit stays within specification on a verification drive per service information.

Can I Still Drive With P2376?

You may be able to drive with P2376, but it is not recommended to ignore it because a knock sensor circuit low condition can affect how the control module manages ignition timing and engine protection strategies. If the vehicle enters reduced-power mode, runs poorly, misfires, stalls, or shows additional critical warnings, do not continue driving—have it inspected and repaired to prevent drivability issues and possible engine damage.

What Happens If You Ignore P2376?

Ignoring P2376 can lead to persistent malfunction indicator lamp illumination, reduced performance, poor fuel economy, and ongoing drivability complaints if the control module compensates for unreliable knock input. Long-term operation without correct knock feedback may increase the chance of spark timing not being optimized for conditions, which can contribute to overheating or engine damage on some vehicles, depending on how the strategy is designed.

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

  • P2372 – Knock Sensor 1 Circuit Low (Bank 1)
  • P2354 – Cylinder 3 Knock Sensor Circuit
  • P2353 – Cylinder 2 Knock Sensor Circuit
  • P2352 – Cylinder 1 Knock Sensor Circuit
  • P2351 – Cylinder 16 Above Knock Threshold
  • P2350 – Cylinder 15 Above Knock Threshold

Key Takeaways

  • P2376 indicates a circuit low condition: The control module detected Knock Sensor 2 (Bank 2) signal/input lower than expected for the circuit.
  • Most common roots are electrical: Short-to-ground, wiring damage, connector/terminal problems, or feed/ground integrity issues.
  • Test before replacing parts: Confirm the low condition with circuit checks and harness testing rather than guessing.
  • Driving may be possible, but not ideal: Engine protection strategies may alter performance and efficiency until repaired.
  • Verify the repair: Clear the DTC and confirm it does not return under similar operating conditions using a road test and live-data review.

Vehicles Commonly Affected by P2376

  • Engines with multiple knock sensors: Applications using separate sensors per bank and/or multiple sensors per bank.
  • V-type engine layouts: Configurations that define Bank 2 and use dedicated bank-specific sensor circuits.
  • Vehicles with tight engine packaging: Harnesses routed near hot surfaces or sharp edges where chafing can occur.
  • High-mileage vehicles: Increased likelihood of brittle wiring, terminal tension loss, and corrosion-related resistance.
  • Vehicles exposed to moisture: Environments that promote connector corrosion or water intrusion at low-mounted connectors.
  • Recent engine work history: Service that may disturb harness routing, connector seating, or ground attachments.
  • Vehicles with prior wiring repairs: Splices or nonstandard repairs that can introduce resistance or intermittent shorts.
  • Frequent vibration duty cycles: Operating conditions that stress connectors and harness retention over time.

FAQ

Does P2376 mean the knock sensor is bad?

No. P2376 means the Knock Sensor 2 (Bank 2) circuit is being seen as low by the control module. A failed sensor is possible, but wiring faults, connector/terminal issues, and short-to-ground conditions are common and should be tested first.

What is “Bank 2” for P2376?

Bank 2 identifies the side of the engine that is not Bank 1, as defined by the vehicle manufacturer. Bank labeling varies by vehicle, so confirm Bank 2 location using the correct service information before testing or replacing any parts.

Can a short-to-ground cause P2376?

Yes. A short-to-ground on the signal circuit, a pinched harness, rubbed-through insulation, or moisture bridging terminals can pull the circuit low and trigger P2376. Testing should focus on finding where the circuit is being pulled down.

Will clearing the code fix P2376?

Clearing the code only resets the stored fault information; it does not correct the underlying circuit low condition. If the problem remains, P2376 will typically return after the module runs its self-checks under the right operating conditions.

What should be checked first for a circuit low DTC like P2376?

Start with a visual inspection of the Knock Sensor 2 (Bank 2) connector and harness for damage, looseness, and corrosion, then confirm power/ground integrity and look for short-to-ground or excessive resistance with electrical testing before considering sensor replacement.

After any repair, clear P2376, perform a verification drive, and review live data (where available) to ensure the knock sensor circuit no longer drops low under the conditions that originally triggered the fault.