Code
P0332
Generic
P — Powertrain
Knock/Combustion Vibration Sensor B Circuit Low
Views:
UK: 21
EN: 26
RU: 36
AI status
Completed
Completed
100%
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
- Verify the code with a scan tool. Record freeze frame data and confirm conditions when code set (engine temp, RPM, load).
- Perform a visual inspection of the sensor, mounting bolt, connector and wiring on bank B. Repair obvious damage.
- Unplug connector, check for corrosion, bent pins, water intrusion and apply contact cleaner if needed. Reconnect and recheck.
- Check continuity from the sensor signal pin to the ECM input pin. Repair any open or high-resistance connections. Check for short to ground.
- 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.
- 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.
- 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.
- If new sensor does not restore signal, trace and repair wiring between sensor and ECM. Check ECM grounds and reference circuits.
- If wiring is confirmed good and sensor replacement fails, consider ECM input failure — consult vehicle-specific procedures before replacing ECM.
- 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)
Views:
UK: 4
EN: 9
RU: 8
AI status
Completed
Completed
100%
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
- Verify the code with a scan tool. Record freeze frame data and confirm conditions when code set (engine temp, RPM, load).
- Perform a visual inspection of the sensor, mounting bolt, connector and wiring on bank B. Repair obvious damage.
- Unplug connector, check for corrosion, bent pins, water intrusion and apply contact cleaner if needed. Reconnect and recheck.
- Check continuity from the sensor signal pin to the ECM input pin. Repair any open or high-resistance connections. Check for short to ground.
- 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.
- 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.
- 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.
- If new sensor does not restore signal, trace and repair wiring between sensor and ECM. Check ECM grounds and reference circuits.
- If wiring is confirmed good and sensor replacement fails, consider ECM input failure — consult vehicle-specific procedures before replacing ECM.
- 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
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Code
P0332
HUMMER
P — Powertrain
Knock Sensor 2 Circuit Low Input (Bank 2)
Views:
UK: 10
EN: 18
RU: 24
AI status
Completed
Completed
100%
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
- Verify the code with a scan tool. Record freeze frame data and confirm conditions when code set (engine temp, RPM, load).
- Perform a visual inspection of the sensor, mounting bolt, connector and wiring on bank B. Repair obvious damage.
- Unplug connector, check for corrosion, bent pins, water intrusion and apply contact cleaner if needed. Reconnect and recheck.
- Check continuity from the sensor signal pin to the ECM input pin. Repair any open or high-resistance connections. Check for short to ground.
- 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.
- 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.
- 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.
- If new sensor does not restore signal, trace and repair wiring between sensor and ECM. Check ECM grounds and reference circuits.
- If wiring is confirmed good and sensor replacement fails, consider ECM input failure — consult vehicle-specific procedures before replacing ECM.
- 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
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Code
P0332
LAND ROVER
P — Powertrain
Knock sensor 2 circuit low input
Views:
UK: 6
EN: 11
RU: 18
AI status
Completed
Completed
100%
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
- Verify the code with a scan tool. Record freeze frame data and confirm conditions when code set (engine temp, RPM, load).
- Perform a visual inspection of the sensor, mounting bolt, connector and wiring on bank B. Repair obvious damage.
- Unplug connector, check for corrosion, bent pins, water intrusion and apply contact cleaner if needed. Reconnect and recheck.
- Check continuity from the sensor signal pin to the ECM input pin. Repair any open or high-resistance connections. Check for short to ground.
- 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.
- 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.
- 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.
- If new sensor does not restore signal, trace and repair wiring between sensor and ECM. Check ECM grounds and reference circuits.
- If wiring is confirmed good and sensor replacement fails, consider ECM input failure — consult vehicle-specific procedures before replacing ECM.
- 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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Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
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Land Rover Defender Workshop Manual Supplement & Body Repair Manual (1999 & 2002 MY)
Workshop Manual199,00 UAH
Land Rover Range Rover — Electrical Library (LRL 0453ENG, 2002)
Workshop Manual199,00 UAH
Your experience will help others
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