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Home / DTC / P0332 — Knock/Combustion Vibration Sensor B Circuit Low

P0332 — Knock/Combustion Vibration Sensor B Circuit Low

Detailed page for trouble code P0332.

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59brands
11,914generic
22,491specific
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Code

P0332

Generic P — Powertrain

Knock/Combustion Vibration Sensor B Circuit Low

Brand: Generic
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty knock/combustion vibration sensor (Bank B)
  • Open circuit or high-resistance connection in sensor signal wire
  • Short to ground in the signal circuit
  • Corroded or loose connector at sensor or ECM
  • Water intrusion or mechanical damage to harness
  • Faulty ECM or damaged input circuit (less common)

Symptoms

  • MIL (check engine lamp) illuminated
  • Possible reduced engine performance or loss of ignition timing adjustments
  • Engine knock detection disabled — potential for audible pinging under load
  • Rough idle, hesitation or stumble under acceleration (depending on strategy)
  • Poor fuel economy in some cases
  • Codes may return intermittently if the fault is intermittent

What to check

  • Read and record freeze-frame and live data with a scan tool; note conditions when code set
  • Visually inspect sensor and wiring for damage, chafing, corrosion, or loose mounting
  • Verify connector terminals are clean and making good contact; unplug and inspect
  • Check continuity between sensor signal pin and ECM pin; check for short to ground or battery
  • Measure sensor output with an oscilloscope or multimeter while cranking/running and while inducing knock
  • Wiggle harness and connectors while monitoring live signal to detect intermittent faults

Signal parameters

  • Knock sensors produce an AC voltage (pulses) in response to cylinder detonation/vibration — not a steady DC voltage
  • At idle with no knock the sensor output is near zero (very small noise); during knock the sensor produces short voltage spikes
  • Pulse amplitude varies by engine and sensor — typically small (tens to hundreds of millivolts) up to around 1 V or more on some systems
  • Pulse frequency is in the kHz range (high frequency compared with crank/cam signals)
  • A valid signal should appear on the sensor line when the engine is cranked or when knock is induced (screwdriver-on-block test) — a steady low/0 V indicates a low/open condition

Diagnostic algorithm

  1. Verify the code with a scan tool. Record freeze frame data and confirm conditions when code set (engine temp, RPM, load).
  2. Perform a visual inspection of the sensor, mounting bolt, connector and wiring on bank B. Repair obvious damage.
  3. Unplug connector, check for corrosion, bent pins, water intrusion and apply contact cleaner if needed. Reconnect and recheck.
  4. Check continuity from the sensor signal pin to the ECM input pin. Repair any open or high-resistance connections. Check for short to ground.
  5. Backprobe the sensor signal while cranking/running. Use an oscilloscope if available to look for AC knock pulses. If using a DMM, look for small fluctuating voltage when inducing knock.
  6. Induce a knock (lightly tap the block near the sensor with a soft tool) while monitoring the waveform or live data to confirm sensor responsiveness.
  7. If no signal or low signal persists, swap with a known-good identical sensor (if accessible) or replace the sensor on bank B and re-test.
  8. If new sensor does not restore signal, trace and repair wiring between sensor and ECM. Check ECM grounds and reference circuits.
  9. If wiring is confirmed good and sensor replacement fails, consider ECM input failure — consult vehicle-specific procedures before replacing ECM.
  10. Clear codes and perform a road test under conditions that initially set the code. Re-scan and verify repair.

Likely causes

  • Damaged wiring or connector between sensor and ECM
  • Failed knock sensor element
  • Connector corrosion or moisture intrusion
  • Sensor physically loose or not mounted to engine block
  • Intermittent open/short in harness when engine is running

Fault status

⚠️ Status
Stored DTC P0332. ECM detected low or absent voltage/signal on Knock/Combustion Vibration Sensor B circuit. MIL illuminated. Freeze frame and live data available.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

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Code

P0332

GWM P — Powertrain

- Low reading of 2 knock sensors (bank 2)

Brand: GWM
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty knock/combustion vibration sensor (Bank B)
  • Open circuit or high-resistance connection in sensor signal wire
  • Short to ground in the signal circuit
  • Corroded or loose connector at sensor or ECM
  • Water intrusion or mechanical damage to harness
  • Faulty ECM or damaged input circuit (less common)

Symptoms

  • MIL (check engine lamp) illuminated
  • Possible reduced engine performance or loss of ignition timing adjustments
  • Engine knock detection disabled — potential for audible pinging under load
  • Rough idle, hesitation or stumble under acceleration (depending on strategy)
  • Poor fuel economy in some cases
  • Codes may return intermittently if the fault is intermittent

What to check

  • Read and record freeze-frame and live data with a scan tool; note conditions when code set
  • Visually inspect sensor and wiring for damage, chafing, corrosion, or loose mounting
  • Verify connector terminals are clean and making good contact; unplug and inspect
  • Check continuity between sensor signal pin and ECM pin; check for short to ground or battery
  • Measure sensor output with an oscilloscope or multimeter while cranking/running and while inducing knock
  • Wiggle harness and connectors while monitoring live signal to detect intermittent faults

Signal parameters

  • Knock sensors produce an AC voltage (pulses) in response to cylinder detonation/vibration — not a steady DC voltage
  • At idle with no knock the sensor output is near zero (very small noise); during knock the sensor produces short voltage spikes
  • Pulse amplitude varies by engine and sensor — typically small (tens to hundreds of millivolts) up to around 1 V or more on some systems
  • Pulse frequency is in the kHz range (high frequency compared with crank/cam signals)
  • A valid signal should appear on the sensor line when the engine is cranked or when knock is induced (screwdriver-on-block test) — a steady low/0 V indicates a low/open condition

Diagnostic algorithm

  1. Verify the code with a scan tool. Record freeze frame data and confirm conditions when code set (engine temp, RPM, load).
  2. Perform a visual inspection of the sensor, mounting bolt, connector and wiring on bank B. Repair obvious damage.
  3. Unplug connector, check for corrosion, bent pins, water intrusion and apply contact cleaner if needed. Reconnect and recheck.
  4. Check continuity from the sensor signal pin to the ECM input pin. Repair any open or high-resistance connections. Check for short to ground.
  5. Backprobe the sensor signal while cranking/running. Use an oscilloscope if available to look for AC knock pulses. If using a DMM, look for small fluctuating voltage when inducing knock.
  6. Induce a knock (lightly tap the block near the sensor with a soft tool) while monitoring the waveform or live data to confirm sensor responsiveness.
  7. If no signal or low signal persists, swap with a known-good identical sensor (if accessible) or replace the sensor on bank B and re-test.
  8. If new sensor does not restore signal, trace and repair wiring between sensor and ECM. Check ECM grounds and reference circuits.
  9. If wiring is confirmed good and sensor replacement fails, consider ECM input failure — consult vehicle-specific procedures before replacing ECM.
  10. Clear codes and perform a road test under conditions that initially set the code. Re-scan and verify repair.

Likely causes

  • Damaged wiring or connector between sensor and ECM
  • Failed knock sensor element
  • Connector corrosion or moisture intrusion
  • Sensor physically loose or not mounted to engine block
  • Intermittent open/short in harness when engine is running

Fault status

⚠️ Status
Stored DTC P0332. ECM detected low or absent voltage/signal on Knock/Combustion Vibration Sensor B circuit. MIL illuminated. Freeze frame and live data available.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0325 P0327 P0331 P0333 P0326
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Code

P0332

HUMMER P — Powertrain

Knock Sensor 2 Circuit Low Input (Bank 2)

Brand: HUMMER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty knock/combustion vibration sensor (Bank B)
  • Open circuit or high-resistance connection in sensor signal wire
  • Short to ground in the signal circuit
  • Corroded or loose connector at sensor or ECM
  • Water intrusion or mechanical damage to harness
  • Faulty ECM or damaged input circuit (less common)

Symptoms

  • MIL (check engine lamp) illuminated
  • Possible reduced engine performance or loss of ignition timing adjustments
  • Engine knock detection disabled — potential for audible pinging under load
  • Rough idle, hesitation or stumble under acceleration (depending on strategy)
  • Poor fuel economy in some cases
  • Codes may return intermittently if the fault is intermittent

What to check

  • Read and record freeze-frame and live data with a scan tool; note conditions when code set
  • Visually inspect sensor and wiring for damage, chafing, corrosion, or loose mounting
  • Verify connector terminals are clean and making good contact; unplug and inspect
  • Check continuity between sensor signal pin and ECM pin; check for short to ground or battery
  • Measure sensor output with an oscilloscope or multimeter while cranking/running and while inducing knock
  • Wiggle harness and connectors while monitoring live signal to detect intermittent faults

Signal parameters

  • Knock sensors produce an AC voltage (pulses) in response to cylinder detonation/vibration — not a steady DC voltage
  • At idle with no knock the sensor output is near zero (very small noise); during knock the sensor produces short voltage spikes
  • Pulse amplitude varies by engine and sensor — typically small (tens to hundreds of millivolts) up to around 1 V or more on some systems
  • Pulse frequency is in the kHz range (high frequency compared with crank/cam signals)
  • A valid signal should appear on the sensor line when the engine is cranked or when knock is induced (screwdriver-on-block test) — a steady low/0 V indicates a low/open condition

Diagnostic algorithm

  1. Verify the code with a scan tool. Record freeze frame data and confirm conditions when code set (engine temp, RPM, load).
  2. Perform a visual inspection of the sensor, mounting bolt, connector and wiring on bank B. Repair obvious damage.
  3. Unplug connector, check for corrosion, bent pins, water intrusion and apply contact cleaner if needed. Reconnect and recheck.
  4. Check continuity from the sensor signal pin to the ECM input pin. Repair any open or high-resistance connections. Check for short to ground.
  5. Backprobe the sensor signal while cranking/running. Use an oscilloscope if available to look for AC knock pulses. If using a DMM, look for small fluctuating voltage when inducing knock.
  6. Induce a knock (lightly tap the block near the sensor with a soft tool) while monitoring the waveform or live data to confirm sensor responsiveness.
  7. If no signal or low signal persists, swap with a known-good identical sensor (if accessible) or replace the sensor on bank B and re-test.
  8. If new sensor does not restore signal, trace and repair wiring between sensor and ECM. Check ECM grounds and reference circuits.
  9. If wiring is confirmed good and sensor replacement fails, consider ECM input failure — consult vehicle-specific procedures before replacing ECM.
  10. Clear codes and perform a road test under conditions that initially set the code. Re-scan and verify repair.

Likely causes

  • Damaged wiring or connector between sensor and ECM
  • Failed knock sensor element
  • Connector corrosion or moisture intrusion
  • Sensor physically loose or not mounted to engine block
  • Intermittent open/short in harness when engine is running

Fault status

⚠️ Status
Stored DTC P0332. ECM detected low or absent voltage/signal on Knock/Combustion Vibration Sensor B circuit. MIL illuminated. Freeze frame and live data available.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0325 P0327 P0331 P0333 P0326
Repair manuals

Manual library for HUMMER

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Browse 138 HUMMER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

HUMMER

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Code

P0332

LAND ROVER P — Powertrain

Knock sensor 2 circuit low input

Brand: LAND ROVER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty knock/combustion vibration sensor (Bank B)
  • Open circuit or high-resistance connection in sensor signal wire
  • Short to ground in the signal circuit
  • Corroded or loose connector at sensor or ECM
  • Water intrusion or mechanical damage to harness
  • Faulty ECM or damaged input circuit (less common)

Symptoms

  • MIL (check engine lamp) illuminated
  • Possible reduced engine performance or loss of ignition timing adjustments
  • Engine knock detection disabled — potential for audible pinging under load
  • Rough idle, hesitation or stumble under acceleration (depending on strategy)
  • Poor fuel economy in some cases
  • Codes may return intermittently if the fault is intermittent

What to check

  • Read and record freeze-frame and live data with a scan tool; note conditions when code set
  • Visually inspect sensor and wiring for damage, chafing, corrosion, or loose mounting
  • Verify connector terminals are clean and making good contact; unplug and inspect
  • Check continuity between sensor signal pin and ECM pin; check for short to ground or battery
  • Measure sensor output with an oscilloscope or multimeter while cranking/running and while inducing knock
  • Wiggle harness and connectors while monitoring live signal to detect intermittent faults

Signal parameters

  • Knock sensors produce an AC voltage (pulses) in response to cylinder detonation/vibration — not a steady DC voltage
  • At idle with no knock the sensor output is near zero (very small noise); during knock the sensor produces short voltage spikes
  • Pulse amplitude varies by engine and sensor — typically small (tens to hundreds of millivolts) up to around 1 V or more on some systems
  • Pulse frequency is in the kHz range (high frequency compared with crank/cam signals)
  • A valid signal should appear on the sensor line when the engine is cranked or when knock is induced (screwdriver-on-block test) — a steady low/0 V indicates a low/open condition

Diagnostic algorithm

  1. Verify the code with a scan tool. Record freeze frame data and confirm conditions when code set (engine temp, RPM, load).
  2. Perform a visual inspection of the sensor, mounting bolt, connector and wiring on bank B. Repair obvious damage.
  3. Unplug connector, check for corrosion, bent pins, water intrusion and apply contact cleaner if needed. Reconnect and recheck.
  4. Check continuity from the sensor signal pin to the ECM input pin. Repair any open or high-resistance connections. Check for short to ground.
  5. Backprobe the sensor signal while cranking/running. Use an oscilloscope if available to look for AC knock pulses. If using a DMM, look for small fluctuating voltage when inducing knock.
  6. Induce a knock (lightly tap the block near the sensor with a soft tool) while monitoring the waveform or live data to confirm sensor responsiveness.
  7. If no signal or low signal persists, swap with a known-good identical sensor (if accessible) or replace the sensor on bank B and re-test.
  8. If new sensor does not restore signal, trace and repair wiring between sensor and ECM. Check ECM grounds and reference circuits.
  9. If wiring is confirmed good and sensor replacement fails, consider ECM input failure — consult vehicle-specific procedures before replacing ECM.
  10. Clear codes and perform a road test under conditions that initially set the code. Re-scan and verify repair.

Likely causes

  • Damaged wiring or connector between sensor and ECM
  • Failed knock sensor element
  • Connector corrosion or moisture intrusion
  • Sensor physically loose or not mounted to engine block
  • Intermittent open/short in harness when engine is running

Fault status

⚠️ Status
Stored DTC P0332. ECM detected low or absent voltage/signal on Knock/Combustion Vibration Sensor B circuit. MIL illuminated. Freeze frame and live data available.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 0.5-2.0 hours

Similar codes

P0325 P0327 P0331 P0333 P0326
273

Browse 273 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

LAND ROVER

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+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
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