Code
P0331
Generic
P — Powertrain
Knock/Combustion Vibration Sensor B Circuit Range/Performance
Views:
UK: 15
EN: 20
RU: 23
AI status
Completed
Completed
100%
Causes
- Faulty knock/combustion vibration sensor (sensor B)
- Damaged, corroded, or disconnected wiring or connector at the sensor
- Short to power or short to ground in the sensor harness
- Poor sensor mounting (loose or missing bolt, wrong torque, or insulating debris)
- Poor ground or reference circuit to sensor or PCM
- Faulty or intermittent PCM input circuit
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Possible ignition timing retard leading to reduced power or poor driveability
- Engine may run normally but with reduced knock control (noisy or high engine vibration under load)
- Decreased fuel economy or increased emissions if timing is limited
- Intermittent fault or codes that clear/reappear with vibration or temperature changes
What to check
- Read freeze-frame data and live data stream to confirm conditions when code set
- Visually inspect sensor B connector and wiring for damage, corrosion, pin push-out, or rubbing
- Wiggle harness while monitoring live knock sensor signal to detect intermittent opens/shorts
- Compare sensor B signal to sensor A (if available) with a scope or scan tool
- Measure continuity and resistance of sensor circuit between sensor connector and PCM connector
- Check engine and chassis grounds related to the sensor/PCM
Signal parameters
- At rest (no knock): sensor output should be stable and near baseline (very low AC activity)
- Under knock: sensor produces AC pulses; amplitudes typically in the millivolt to volt range depending on system
- Frequency content: knock signals have energy in the kHz range (high-frequency vibration), visible on an oscilloscope
- A completely open circuit will show no measurable output; a short to ground or power can pull the signal out of range
- Many control modules monitor signal amplitude, frequency, and timing relative to engine speed
Diagnostic algorithm
- Verify code and freeze-frame data with a scan tool. Note engine speed, load, temperature when code set.
- Clear codes and perform a driving or load test to see if code returns under similar conditions.
- Perform a visual inspection of sensor B, its connector, and the harness for signs of damage, corrosion, oil ingress, or loose pins.
- Check sensor mounting: remove debris, ensure proper metal-to-metal contact and correct torque of mounting bolt.
- Backprobe the sensor connector and monitor the signal with a scan tool or oscilloscope while inducing a light mechanical knock (use safe non-damaging tapping) or run the engine under load. Look for transient AC pulses when knocking and a stable baseline otherwise.
- Measure continuity between the sensor connector and the PCM connector; check for opens, high resistance, or intermittent connections (wiggle test).
- Check for shorts to power or ground in the harness (with ignition off) using an ohmmeter; also verify sensor supply/ground/reference circuits at the PCM if applicable.
- Swap sensor B with a known-good sensor or with sensor A if wiring and mounting are identical; if the code follows the sensor, replace the sensor.
- If wiring and sensor check good, inspect and test relevant PCM grounds and power supplies. If evidence points to PCM input failure, follow manufacturer guidance for PCM testing/replacement.
- After repair, clear codes and perform a road/diagnostic test under the conditions that previously set the code to confirm repair.
Likely causes
- Sensor B failed or producing weak/erratic output
- Connector corrosion, loose pin, or wiring break at sensor
- Open or short in harness between sensor and PCM
- Poor sensor mounting or missing earth/ground at sensor
- Less likely: PCM input fault
Fault status
Status
P0331 - Knock/Combustion Vibration Sensor B Circuit Range/Performance. Check sensor, connector, harness, mounting, and PCM input.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Code
P0331
GWM
P — Powertrain
- Invalid indicator / not adjusted 2 knock sensor (bank 2)
Views:
UK: 4
EN: 8
RU: 8
AI status
Completed
Completed
100%
Causes
- Faulty knock/combustion vibration sensor (sensor B)
- Damaged, corroded, or disconnected wiring or connector at the sensor
- Short to power or short to ground in the sensor harness
- Poor sensor mounting (loose or missing bolt, wrong torque, or insulating debris)
- Poor ground or reference circuit to sensor or PCM
- Faulty or intermittent PCM input circuit
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Possible ignition timing retard leading to reduced power or poor driveability
- Engine may run normally but with reduced knock control (noisy or high engine vibration under load)
- Decreased fuel economy or increased emissions if timing is limited
- Intermittent fault or codes that clear/reappear with vibration or temperature changes
What to check
- Read freeze-frame data and live data stream to confirm conditions when code set
- Visually inspect sensor B connector and wiring for damage, corrosion, pin push-out, or rubbing
- Wiggle harness while monitoring live knock sensor signal to detect intermittent opens/shorts
- Compare sensor B signal to sensor A (if available) with a scope or scan tool
- Measure continuity and resistance of sensor circuit between sensor connector and PCM connector
- Check engine and chassis grounds related to the sensor/PCM
Signal parameters
- At rest (no knock): sensor output should be stable and near baseline (very low AC activity)
- Under knock: sensor produces AC pulses; amplitudes typically in the millivolt to volt range depending on system
- Frequency content: knock signals have energy in the kHz range (high-frequency vibration), visible on an oscilloscope
- A completely open circuit will show no measurable output; a short to ground or power can pull the signal out of range
- Many control modules monitor signal amplitude, frequency, and timing relative to engine speed
Diagnostic algorithm
- Verify code and freeze-frame data with a scan tool. Note engine speed, load, temperature when code set.
- Clear codes and perform a driving or load test to see if code returns under similar conditions.
- Perform a visual inspection of sensor B, its connector, and the harness for signs of damage, corrosion, oil ingress, or loose pins.
- Check sensor mounting: remove debris, ensure proper metal-to-metal contact and correct torque of mounting bolt.
- Backprobe the sensor connector and monitor the signal with a scan tool or oscilloscope while inducing a light mechanical knock (use safe non-damaging tapping) or run the engine under load. Look for transient AC pulses when knocking and a stable baseline otherwise.
- Measure continuity between the sensor connector and the PCM connector; check for opens, high resistance, or intermittent connections (wiggle test).
- Check for shorts to power or ground in the harness (with ignition off) using an ohmmeter; also verify sensor supply/ground/reference circuits at the PCM if applicable.
- Swap sensor B with a known-good sensor or with sensor A if wiring and mounting are identical; if the code follows the sensor, replace the sensor.
- If wiring and sensor check good, inspect and test relevant PCM grounds and power supplies. If evidence points to PCM input failure, follow manufacturer guidance for PCM testing/replacement.
- After repair, clear codes and perform a road/diagnostic test under the conditions that previously set the code to confirm repair.
Likely causes
- Sensor B failed or producing weak/erratic output
- Connector corrosion, loose pin, or wiring break at sensor
- Open or short in harness between sensor and PCM
- Poor sensor mounting or missing earth/ground at sensor
- Less likely: PCM input fault
Fault status
Status
P0331 - Knock/Combustion Vibration Sensor B Circuit Range/Performance. Check sensor, connector, harness, mounting, and PCM input.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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Code
P0331
HUMMER
P — Powertrain
Knock Sensor 2 Circuit Range/Performance (Bank 2)
Views:
UK: 6
EN: 7
RU: 10
AI status
Completed
Completed
100%
Causes
- Faulty knock/combustion vibration sensor (sensor B)
- Damaged, corroded, or disconnected wiring or connector at the sensor
- Short to power or short to ground in the sensor harness
- Poor sensor mounting (loose or missing bolt, wrong torque, or insulating debris)
- Poor ground or reference circuit to sensor or PCM
- Faulty or intermittent PCM input circuit
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Possible ignition timing retard leading to reduced power or poor driveability
- Engine may run normally but with reduced knock control (noisy or high engine vibration under load)
- Decreased fuel economy or increased emissions if timing is limited
- Intermittent fault or codes that clear/reappear with vibration or temperature changes
What to check
- Read freeze-frame data and live data stream to confirm conditions when code set
- Visually inspect sensor B connector and wiring for damage, corrosion, pin push-out, or rubbing
- Wiggle harness while monitoring live knock sensor signal to detect intermittent opens/shorts
- Compare sensor B signal to sensor A (if available) with a scope or scan tool
- Measure continuity and resistance of sensor circuit between sensor connector and PCM connector
- Check engine and chassis grounds related to the sensor/PCM
Signal parameters
- At rest (no knock): sensor output should be stable and near baseline (very low AC activity)
- Under knock: sensor produces AC pulses; amplitudes typically in the millivolt to volt range depending on system
- Frequency content: knock signals have energy in the kHz range (high-frequency vibration), visible on an oscilloscope
- A completely open circuit will show no measurable output; a short to ground or power can pull the signal out of range
- Many control modules monitor signal amplitude, frequency, and timing relative to engine speed
Diagnostic algorithm
- Verify code and freeze-frame data with a scan tool. Note engine speed, load, temperature when code set.
- Clear codes and perform a driving or load test to see if code returns under similar conditions.
- Perform a visual inspection of sensor B, its connector, and the harness for signs of damage, corrosion, oil ingress, or loose pins.
- Check sensor mounting: remove debris, ensure proper metal-to-metal contact and correct torque of mounting bolt.
- Backprobe the sensor connector and monitor the signal with a scan tool or oscilloscope while inducing a light mechanical knock (use safe non-damaging tapping) or run the engine under load. Look for transient AC pulses when knocking and a stable baseline otherwise.
- Measure continuity between the sensor connector and the PCM connector; check for opens, high resistance, or intermittent connections (wiggle test).
- Check for shorts to power or ground in the harness (with ignition off) using an ohmmeter; also verify sensor supply/ground/reference circuits at the PCM if applicable.
- Swap sensor B with a known-good sensor or with sensor A if wiring and mounting are identical; if the code follows the sensor, replace the sensor.
- If wiring and sensor check good, inspect and test relevant PCM grounds and power supplies. If evidence points to PCM input failure, follow manufacturer guidance for PCM testing/replacement.
- After repair, clear codes and perform a road/diagnostic test under the conditions that previously set the code to confirm repair.
Likely causes
- Sensor B failed or producing weak/erratic output
- Connector corrosion, loose pin, or wiring break at sensor
- Open or short in harness between sensor and PCM
- Poor sensor mounting or missing earth/ground at sensor
- Less likely: PCM input fault
Fault status
Status
P0331 - Knock/Combustion Vibration Sensor B Circuit Range/Performance. Check sensor, connector, harness, mounting, and PCM input.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
Similar codes
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Code
P0331
LAND ROVER
P — Powertrain
Knock sensor 2 circuit range/performance
Views:
UK: 5
EN: 8
RU: 8
AI status
Completed
Completed
100%
Causes
- Faulty knock/combustion vibration sensor (sensor B)
- Damaged, corroded, or disconnected wiring or connector at the sensor
- Short to power or short to ground in the sensor harness
- Poor sensor mounting (loose or missing bolt, wrong torque, or insulating debris)
- Poor ground or reference circuit to sensor or PCM
- Faulty or intermittent PCM input circuit
Symptoms
- Malfunction Indicator Lamp (MIL) illuminated
- Possible ignition timing retard leading to reduced power or poor driveability
- Engine may run normally but with reduced knock control (noisy or high engine vibration under load)
- Decreased fuel economy or increased emissions if timing is limited
- Intermittent fault or codes that clear/reappear with vibration or temperature changes
What to check
- Read freeze-frame data and live data stream to confirm conditions when code set
- Visually inspect sensor B connector and wiring for damage, corrosion, pin push-out, or rubbing
- Wiggle harness while monitoring live knock sensor signal to detect intermittent opens/shorts
- Compare sensor B signal to sensor A (if available) with a scope or scan tool
- Measure continuity and resistance of sensor circuit between sensor connector and PCM connector
- Check engine and chassis grounds related to the sensor/PCM
Signal parameters
- At rest (no knock): sensor output should be stable and near baseline (very low AC activity)
- Under knock: sensor produces AC pulses; amplitudes typically in the millivolt to volt range depending on system
- Frequency content: knock signals have energy in the kHz range (high-frequency vibration), visible on an oscilloscope
- A completely open circuit will show no measurable output; a short to ground or power can pull the signal out of range
- Many control modules monitor signal amplitude, frequency, and timing relative to engine speed
Diagnostic algorithm
- Verify code and freeze-frame data with a scan tool. Note engine speed, load, temperature when code set.
- Clear codes and perform a driving or load test to see if code returns under similar conditions.
- Perform a visual inspection of sensor B, its connector, and the harness for signs of damage, corrosion, oil ingress, or loose pins.
- Check sensor mounting: remove debris, ensure proper metal-to-metal contact and correct torque of mounting bolt.
- Backprobe the sensor connector and monitor the signal with a scan tool or oscilloscope while inducing a light mechanical knock (use safe non-damaging tapping) or run the engine under load. Look for transient AC pulses when knocking and a stable baseline otherwise.
- Measure continuity between the sensor connector and the PCM connector; check for opens, high resistance, or intermittent connections (wiggle test).
- Check for shorts to power or ground in the harness (with ignition off) using an ohmmeter; also verify sensor supply/ground/reference circuits at the PCM if applicable.
- Swap sensor B with a known-good sensor or with sensor A if wiring and mounting are identical; if the code follows the sensor, replace the sensor.
- If wiring and sensor check good, inspect and test relevant PCM grounds and power supplies. If evidence points to PCM input failure, follow manufacturer guidance for PCM testing/replacement.
- After repair, clear codes and perform a road/diagnostic test under the conditions that previously set the code to confirm repair.
Likely causes
- Sensor B failed or producing weak/erratic output
- Connector corrosion, loose pin, or wiring break at sensor
- Open or short in harness between sensor and PCM
- Poor sensor mounting or missing earth/ground at sensor
- Less likely: PCM input fault
Fault status
Status
P0331 - Knock/Combustion Vibration Sensor B Circuit Range/Performance. Check sensor, connector, harness, mounting, and PCM input.
Repair difficulty: Medium
Diagnostic time: 0.5-2.0 hours
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Land Rover Defender 300Tdi — Workshop Manual (1996 model year)
Workshop Manual199,00 UAH
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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Was this AI description helpful?
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