Code
P0326
Generic
P — Powertrain
Knock/Combustion Vibration Sensor A Circuit Range/Performance
AI status
Completed
Completed
100%
Causes
- Faulty knock/combustion vibration sensor (open, shorted, or weak)
- Damaged, corroded, or disconnected sensor connector or wiring (open, short to ground, short to battery)
- Poor sensor mounting or loose/incorrectly torqued sensor
- Faulty or intermittent ground or reference circuit
- Engine mechanical noise or severe detonation confusing the sensor
- Faulty engine control module (rare)
Symptoms
- Check Engine Light (MIL) illuminated
- Engine timing may be retarded causing reduced power or sluggish acceleration
- Poor fuel economy
- Engine may exhibit knocking/detonation under load or at part throttle
- Intermittent performance issues or rough running under certain conditions
What to check
- Connect a scan tool, read DTCs and view freeze frame/live data for knock sensor values
- Visually inspect sensor, connector, and wiring for damage, corrosion, looseness, or heat damage
- Wiggle harness and connector while monitoring live data to look for intermittent faults
- Backprobe signal and ground circuits; check for proper reference voltage and continuity to ECM
- Measure sensor resistance (if applicable) and compare to service data or expected behavior
- Use an oscilloscope to view sensor signal during cranking and under load, or tap test the block while monitoring
Signal parameters
- Sensor is typically piezoelectric; it produces AC pulses proportional to combustion vibration rather than a steady DC voltage
- At idle/no-knock the signal should be low and stable; during knock it should show distinct AC pulse bursts
- Some systems use a biased signal at the ECM — expect low-level AC riding on a reference bias; consult OEM data for exact voltages
- An open circuit, constant voltage (stuck high), or excessive noise indicate circuit/sensor issues
Diagnostic algorithm
- Retrieve freeze frame and related codes; clear codes and road test to confirm reproducibility.
- Visually inspect sensor, mounting bolt, and harness for obvious damage or loose mounting.
- With connector disconnected, check sensor wiring continuity to the ECM and for shorts to ground or battery using a DMM.
- Reconnect and backprobe signal and ground; monitor signal with a suitable scan tool or oscilloscope while cranking and under load. Look for expected low idle noise and distinct pulses when inducing knock (tap test).
- If signal absent or clearly incorrect and wiring is good, replace sensor and retest.
- If new sensor fails to restore proper signal, trace and repair wiring/connector faults or suspect ECM input circuit — consult manufacturer diagnostics before replacing ECM.
- After repair, erase codes and verify repair with a road test under the conditions that originally set the code.
Likely causes
- Wiring harness damage at sensor (chafing, heat exposure, connector corrosion)
- Failed knock sensor element (common failure item)
- Incorrect or loose sensor mounting (results in poor coupling to block)
- Poor ground or connector contact at sensor or ECM
- Intermittent short to power or ground in signal circuit
Fault status
Status
Knock/Combustion Vibration Sensor A Circuit Range/Performance — sensor signal out of expected range or not behaving as expected, may cause timing retard and MIL illumination.
Repair difficulty: Medium
Diagnostic time: 0.5-2.5 hours
Similar codes
Repair manuals
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Code
P0326
GWM
P — Powertrain
- Invalid indicator / not adjusted 1 knock sensor (bank 1 or sensor)
AI status
Completed
Completed
100%
Causes
- Faulty knock/combustion vibration sensor (open, shorted, or weak)
- Damaged, corroded, or disconnected sensor connector or wiring (open, short to ground, short to battery)
- Poor sensor mounting or loose/incorrectly torqued sensor
- Faulty or intermittent ground or reference circuit
- Engine mechanical noise or severe detonation confusing the sensor
- Faulty engine control module (rare)
Symptoms
- Check Engine Light (MIL) illuminated
- Engine timing may be retarded causing reduced power or sluggish acceleration
- Poor fuel economy
- Engine may exhibit knocking/detonation under load or at part throttle
- Intermittent performance issues or rough running under certain conditions
What to check
- Connect a scan tool, read DTCs and view freeze frame/live data for knock sensor values
- Visually inspect sensor, connector, and wiring for damage, corrosion, looseness, or heat damage
- Wiggle harness and connector while monitoring live data to look for intermittent faults
- Backprobe signal and ground circuits; check for proper reference voltage and continuity to ECM
- Measure sensor resistance (if applicable) and compare to service data or expected behavior
- Use an oscilloscope to view sensor signal during cranking and under load, or tap test the block while monitoring
Signal parameters
- Sensor is typically piezoelectric; it produces AC pulses proportional to combustion vibration rather than a steady DC voltage
- At idle/no-knock the signal should be low and stable; during knock it should show distinct AC pulse bursts
- Some systems use a biased signal at the ECM — expect low-level AC riding on a reference bias; consult OEM data for exact voltages
- An open circuit, constant voltage (stuck high), or excessive noise indicate circuit/sensor issues
Diagnostic algorithm
- Retrieve freeze frame and related codes; clear codes and road test to confirm reproducibility.
- Visually inspect sensor, mounting bolt, and harness for obvious damage or loose mounting.
- With connector disconnected, check sensor wiring continuity to the ECM and for shorts to ground or battery using a DMM.
- Reconnect and backprobe signal and ground; monitor signal with a suitable scan tool or oscilloscope while cranking and under load. Look for expected low idle noise and distinct pulses when inducing knock (tap test).
- If signal absent or clearly incorrect and wiring is good, replace sensor and retest.
- If new sensor fails to restore proper signal, trace and repair wiring/connector faults or suspect ECM input circuit — consult manufacturer diagnostics before replacing ECM.
- After repair, erase codes and verify repair with a road test under the conditions that originally set the code.
Likely causes
- Wiring harness damage at sensor (chafing, heat exposure, connector corrosion)
- Failed knock sensor element (common failure item)
- Incorrect or loose sensor mounting (results in poor coupling to block)
- Poor ground or connector contact at sensor or ECM
- Intermittent short to power or ground in signal circuit
Fault status
Status
Knock/Combustion Vibration Sensor A Circuit Range/Performance — sensor signal out of expected range or not behaving as expected, may cause timing retard and MIL illumination.
Repair difficulty: Medium
Diagnostic time: 0.5-2.5 hours
Similar codes
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Code
P0326
HUMMER
P — Powertrain
Knock Sensor Circuit Excessive Spark Retard
AI status
Completed
Completed
100%
Causes
- Faulty knock/combustion vibration sensor (open, shorted, or weak)
- Damaged, corroded, or disconnected sensor connector or wiring (open, short to ground, short to battery)
- Poor sensor mounting or loose/incorrectly torqued sensor
- Faulty or intermittent ground or reference circuit
- Engine mechanical noise or severe detonation confusing the sensor
- Faulty engine control module (rare)
Symptoms
- Check Engine Light (MIL) illuminated
- Engine timing may be retarded causing reduced power or sluggish acceleration
- Poor fuel economy
- Engine may exhibit knocking/detonation under load or at part throttle
- Intermittent performance issues or rough running under certain conditions
What to check
- Connect a scan tool, read DTCs and view freeze frame/live data for knock sensor values
- Visually inspect sensor, connector, and wiring for damage, corrosion, looseness, or heat damage
- Wiggle harness and connector while monitoring live data to look for intermittent faults
- Backprobe signal and ground circuits; check for proper reference voltage and continuity to ECM
- Measure sensor resistance (if applicable) and compare to service data or expected behavior
- Use an oscilloscope to view sensor signal during cranking and under load, or tap test the block while monitoring
Signal parameters
- Sensor is typically piezoelectric; it produces AC pulses proportional to combustion vibration rather than a steady DC voltage
- At idle/no-knock the signal should be low and stable; during knock it should show distinct AC pulse bursts
- Some systems use a biased signal at the ECM — expect low-level AC riding on a reference bias; consult OEM data for exact voltages
- An open circuit, constant voltage (stuck high), or excessive noise indicate circuit/sensor issues
Diagnostic algorithm
- Retrieve freeze frame and related codes; clear codes and road test to confirm reproducibility.
- Visually inspect sensor, mounting bolt, and harness for obvious damage or loose mounting.
- With connector disconnected, check sensor wiring continuity to the ECM and for shorts to ground or battery using a DMM.
- Reconnect and backprobe signal and ground; monitor signal with a suitable scan tool or oscilloscope while cranking and under load. Look for expected low idle noise and distinct pulses when inducing knock (tap test).
- If signal absent or clearly incorrect and wiring is good, replace sensor and retest.
- If new sensor fails to restore proper signal, trace and repair wiring/connector faults or suspect ECM input circuit — consult manufacturer diagnostics before replacing ECM.
- After repair, erase codes and verify repair with a road test under the conditions that originally set the code.
Likely causes
- Wiring harness damage at sensor (chafing, heat exposure, connector corrosion)
- Failed knock sensor element (common failure item)
- Incorrect or loose sensor mounting (results in poor coupling to block)
- Poor ground or connector contact at sensor or ECM
- Intermittent short to power or ground in signal circuit
Fault status
Status
Knock/Combustion Vibration Sensor A Circuit Range/Performance — sensor signal out of expected range or not behaving as expected, may cause timing retard and MIL illumination.
Repair difficulty: Medium
Diagnostic time: 0.5-2.5 hours
Similar codes
Repair manuals
Manual library for HUMMER
138
Browse 138 HUMMER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
HUMMER
-
HUMMER: 2009
-
HUMMER: 2008
-
HUMMER: 2007
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HUMMER: 2005
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HUMMER: 2004
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HUMMER: 2000
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HUMMER: 1999
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HUMMER: 1994
-
HUMMER: 1993
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Code
P0326
LAND ROVER
P — Powertrain
Knock Sensor 1 Range/Performance Circuit
AI status
Completed
Completed
100%
Causes
- Faulty knock/combustion vibration sensor (open, shorted, or weak)
- Damaged, corroded, or disconnected sensor connector or wiring (open, short to ground, short to battery)
- Poor sensor mounting or loose/incorrectly torqued sensor
- Faulty or intermittent ground or reference circuit
- Engine mechanical noise or severe detonation confusing the sensor
- Faulty engine control module (rare)
Symptoms
- Check Engine Light (MIL) illuminated
- Engine timing may be retarded causing reduced power or sluggish acceleration
- Poor fuel economy
- Engine may exhibit knocking/detonation under load or at part throttle
- Intermittent performance issues or rough running under certain conditions
What to check
- Connect a scan tool, read DTCs and view freeze frame/live data for knock sensor values
- Visually inspect sensor, connector, and wiring for damage, corrosion, looseness, or heat damage
- Wiggle harness and connector while monitoring live data to look for intermittent faults
- Backprobe signal and ground circuits; check for proper reference voltage and continuity to ECM
- Measure sensor resistance (if applicable) and compare to service data or expected behavior
- Use an oscilloscope to view sensor signal during cranking and under load, or tap test the block while monitoring
Signal parameters
- Sensor is typically piezoelectric; it produces AC pulses proportional to combustion vibration rather than a steady DC voltage
- At idle/no-knock the signal should be low and stable; during knock it should show distinct AC pulse bursts
- Some systems use a biased signal at the ECM — expect low-level AC riding on a reference bias; consult OEM data for exact voltages
- An open circuit, constant voltage (stuck high), or excessive noise indicate circuit/sensor issues
Diagnostic algorithm
- Retrieve freeze frame and related codes; clear codes and road test to confirm reproducibility.
- Visually inspect sensor, mounting bolt, and harness for obvious damage or loose mounting.
- With connector disconnected, check sensor wiring continuity to the ECM and for shorts to ground or battery using a DMM.
- Reconnect and backprobe signal and ground; monitor signal with a suitable scan tool or oscilloscope while cranking and under load. Look for expected low idle noise and distinct pulses when inducing knock (tap test).
- If signal absent or clearly incorrect and wiring is good, replace sensor and retest.
- If new sensor fails to restore proper signal, trace and repair wiring/connector faults or suspect ECM input circuit — consult manufacturer diagnostics before replacing ECM.
- After repair, erase codes and verify repair with a road test under the conditions that originally set the code.
Likely causes
- Wiring harness damage at sensor (chafing, heat exposure, connector corrosion)
- Failed knock sensor element (common failure item)
- Incorrect or loose sensor mounting (results in poor coupling to block)
- Poor ground or connector contact at sensor or ECM
- Intermittent short to power or ground in signal circuit
Fault status
Status
Knock/Combustion Vibration Sensor A Circuit Range/Performance — sensor signal out of expected range or not behaving as expected, may cause timing retard and MIL illumination.
Repair difficulty: Medium
Diagnostic time: 0.5-2.5 hours
Similar codes
Repair manuals
Manual library for LAND ROVER
320
Browse 320 LAND ROVER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
LAND ROVER
-
LAND ROVER: 2022
-
Defender
- 90
- 90
- 90 S
- 90 S
- 90 V8
- 90 V8
- 90 V8 Carpathian Edition
- 90 V8 Carpathian Edition
- 90 X
- 90 X
- 90 X-Dynamic HSE
- 90 X-Dynamic HSE
- 90 X-Dynamic S
- 90 X-Dynamic S
- 90 X-Dynamic SE
- 90 X-Dynamic SE
- 110
- 110
- 110 S
- 110 S
- 110 SE
- 110 SE
- 110 V8
- 110 V8
- 110 V8 Carpathian Edition
- 110 V8 Carpathian Edition
- 110 X
- 110 X
- 110 X-Dynamic SE
- 110 X-Dynamic SE
- 110 XS Edition
- 110 XS Edition
-
Discovery
- R-Dynamic HSE
- R-Dynamic HSE
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2022: Discovery R-Dynamic S
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2022: Discovery R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Discovery R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Discovery R-Dynamic S
- S
- S
-
Discovery Sport
-
Range Rover
- Autobiography, 4.4L Eng VIN 7 · 4.4L Eng VIN 72022: Range Rover Autobiography
- Autobiography, 4.4L Eng VIN 7 · 4.4L Eng VIN 72022: Range Rover Autobiography
- Autobiography, 5.0L Eng VIN E · 5.0L Eng VIN E2022: Range Rover Autobiography
- Autobiography, 5.0L Eng VIN E · 5.0L Eng VIN E2022: Range Rover Autobiography
- 2022 Range Rover Base
- 2022 Range Rover Base
- First Edition
- First Edition
- HSE Westminster, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover HSE Westminster
- HSE Westminster, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover HSE Westminster
- HSE Westminster, 5.0L Eng VIN E · 5.0L Eng VIN E2022: Range Rover HSE Westminster
- HSE Westminster, 5.0L Eng VIN E · 5.0L Eng VIN E2022: Range Rover HSE Westminster
- SE, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover SE
- SE, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover SE
- SE, 4.4L Eng VIN 7 · 4.4L Eng VIN 72022: Range Rover SE
- SE, 4.4L Eng VIN 7 · 4.4L Eng VIN 72022: Range Rover SE
- SV
- SV
- SVAutobiography
- SVAutobiography
- SVAutobiography Dynamic
- SVAutobiography Dynamic
- SVAutobiography Dynamic Blk.
- SVAutobiography Dynamic Blk.
-
Range Rover Evoque
-
Range Rover Velar
- R-Dynamic HSE
- R-Dynamic HSE
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2022: Range Rover Velar R-Dynamic S
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2022: Range Rover Velar R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover Velar R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover Velar R-Dynamic S
- S, 2.0L Eng VIN X · 2.0L Eng VIN X2022: Range Rover Velar S
- S, 2.0L Eng VIN X · 2.0L Eng VIN X2022: Range Rover Velar S
- S, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover Velar S
- S, 3.0L Eng VIN U · 3.0L Eng VIN U2022: Range Rover Velar S
-
-
LAND ROVER: 2021
-
Discovery
- R-Dynamic HSE
- R-Dynamic HSE
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2021: Discovery R-Dynamic S
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2021: Discovery R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Discovery R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Discovery R-Dynamic S
- S
- S
-
Discovery Sport
-
Range Rover
- Autobiography, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Autobiography
- Autobiography, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Autobiography
- Autobiography Fifty Edition
- Autobiography Fifty Edition
- 2021 Range Rover Base
- 2021 Range Rover Base
- HSE, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover HSE
- HSE, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover HSE
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2021: Range Rover HSE
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2021: Range Rover HSE
- HSE Westminster, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover HSE Westminster
- HSE Westminster, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover HSE Westminster
- HSE Westminster, 5.0L Eng VIN E · 5.0L Eng VIN E2021: Range Rover HSE Westminster
- HSE Westminster, 5.0L Eng VIN E · 5.0L Eng VIN E2021: Range Rover HSE Westminster
- SVAutobiography
- SVAutobiography
- SVAutobiography Dynamic
- SVAutobiography Dynamic
- SVAutobiography Dynamic Blk.
- SVAutobiography Dynamic Blk.
-
Range Rover Evoque
-
Range Rover Sport
- Autobiography, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Sport Autobiography
- Autobiography, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Sport Autobiography
- Autobiography, 5.0L Eng VIN E · 5.0L Eng VIN E2021: Range Rover Sport Autobiography
- Autobiography, 5.0L Eng VIN E · 5.0L Eng VIN E2021: Range Rover Sport Autobiography
- Autobiography Dynamic, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Sport Autobiography Dynamic
- Autobiography Dynamic, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Sport Autobiography Dynamic
- Autobiography Dynamic, 5.0L Eng VIN E · 5.0L Eng VIN E2021: Range Rover Sport Autobiography Dynamic
- Autobiography Dynamic, 5.0L Eng VIN E · 5.0L Eng VIN E2021: Range Rover Sport Autobiography Dynamic
- HSE Dynamic
- HSE Dynamic
- HSE Silver Edition, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Sport HSE Silver Edition
- HSE Silver Edition, 2.0L Eng VIN Y · 2.0L Eng VIN Y2021: Range Rover Sport HSE Silver Edition
- HSE Silver Edition, 3.0L Eng VIN K · 3.0L Eng VIN K2021: Range Rover Sport HSE Silver Edition
- HSE Silver Edition, 3.0L Eng VIN K · 3.0L Eng VIN K2021: Range Rover Sport HSE Silver Edition
- HSE Silver Edition, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover Sport HSE Silver Edition
- HSE Silver Edition, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover Sport HSE Silver Edition
- HST
- HST
- SE
- SE
- SVR
- SVR
- SVR Carbon Edition
- SVR Carbon Edition
-
Range Rover Velar
- R-Dynamic HSE
- R-Dynamic HSE
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2021: Range Rover Velar R-Dynamic S
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2021: Range Rover Velar R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover Velar R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover Velar R-Dynamic S
- S, 2.0L Eng VIN X · 2.0L Eng VIN X2021: Range Rover Velar S
- S, 2.0L Eng VIN X · 2.0L Eng VIN X2021: Range Rover Velar S
- S, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover Velar S
- S, 3.0L Eng VIN U · 3.0L Eng VIN U2021: Range Rover Velar S
-
LAND ROVER: 2020
-
Defender
- 90 First Edition
- 90 First Edition
- 110 First Edition
- 110 First Edition
- 110 HSE
- 110 HSE
- 110 S
- 110 S
- 110 SE
- 110 SE
- 110 X
- 110 X
- 110, 2.0L Eng VIN X · 2.0L Eng VIN X2020: Defender 110
- 110, 2.0L Eng VIN X · 2.0L Eng VIN X2020: Defender 110
- 110, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Defender 110
- 110, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Defender 110
-
Discovery
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Discovery HSE
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Discovery HSE
- HSE, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Discovery HSE
- HSE, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Discovery HSE
- HSE Luxury, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Discovery HSE Luxury
- HSE Luxury, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Discovery HSE Luxury
- HSE Luxury, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Discovery HSE Luxury
- HSE Luxury, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Discovery HSE Luxury
- Landmark
- Landmark
- SE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Discovery SE
- SE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Discovery SE
- SE, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Discovery SE
- SE, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Discovery SE
-
Range Rover
- Autobiography
- Autobiography
- Base, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover Base
- Base, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover Base
- Base, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover Base
- Base, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover Base
- HSE, 2.0L Eng VIN Y · 2.0L Eng VIN Y2020: Range Rover HSE
- HSE, 2.0L Eng VIN Y · 2.0L Eng VIN Y2020: Range Rover HSE
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover HSE
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover HSE
- HSE, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover HSE
- HSE, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover HSE
- HSE, 5.0L Eng VIN E · 5.0L Eng VIN E2020: Range Rover HSE
- HSE, 5.0L Eng VIN E · 5.0L Eng VIN E2020: Range Rover HSE
- SVAutobiography
- SVAutobiography
- SVAutobiography Dynamic
- SVAutobiography Dynamic
-
Range Rover Evoque
-
Range Rover Sport
- Autobiography Dynamic, 2.0L Eng VIN Y · 2.0L Eng VIN Y2020: Range Rover Sport Autobiography Dynamic
- Autobiography Dynamic, 2.0L Eng VIN Y · 2.0L Eng VIN Y2020: Range Rover Sport Autobiography Dynamic
- Autobiography Dynamic, 5.0L Eng VIN E · 5.0L Eng VIN E2020: Range Rover Sport Autobiography Dynamic
- Autobiography Dynamic, 5.0L Eng VIN E · 5.0L Eng VIN E2020: Range Rover Sport Autobiography Dynamic
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover Sport HSE
- HSE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover Sport HSE
- HSE, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover Sport HSE
- HSE, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover Sport HSE
- HSE, 5.0L Eng VIN E · 5.0L Eng VIN E2020: Range Rover Sport HSE
- HSE, 5.0L Eng VIN E · 5.0L Eng VIN E2020: Range Rover Sport HSE
- HSE Dynamic
- HSE Dynamic
- HSE PHEV
- HSE PHEV
- HST
- HST
- SE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover Sport SE
- SE, 3.0L Eng VIN K · 3.0L Eng VIN K2020: Range Rover Sport SE
- SE, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover Sport SE
- SE, 3.0L Eng VIN U · 3.0L Eng VIN U2020: Range Rover Sport SE
- SVR
- SVR
-
Range Rover Velar
- R-Dynamic HSE
- R-Dynamic HSE
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2020: Range Rover Velar R-Dynamic S
- R-Dynamic S, 2.0L Eng VIN X · 2.0L Eng VIN X2020: Range Rover Velar R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Range Rover Velar R-Dynamic S
- R-Dynamic S, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Range Rover Velar R-Dynamic S
- S, 2.0L Eng VIN X · 2.0L Eng VIN X2020: Range Rover Velar S
- S, 2.0L Eng VIN X · 2.0L Eng VIN X2020: Range Rover Velar S
- S, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Range Rover Velar S
- S, 3.0L Eng VIN V · 3.0L Eng VIN V2020: Range Rover Velar S
- SVAutobiography Dyn.
- SVAutobiography Dyn.
-
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👍 Like
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Send to email
Code
P0326
SEAT
P — Powertrain
Knock sensor - constant knock
AI status
Completed
Completed
100%
Causes
- Faulty knock/combustion vibration sensor (open, shorted, or weak)
- Damaged, corroded, or disconnected sensor connector or wiring (open, short to ground, short to battery)
- Poor sensor mounting or loose/incorrectly torqued sensor
- Faulty or intermittent ground or reference circuit
- Engine mechanical noise or severe detonation confusing the sensor
- Faulty engine control module (rare)
Symptoms
- Check Engine Light (MIL) illuminated
- Engine timing may be retarded causing reduced power or sluggish acceleration
- Poor fuel economy
- Engine may exhibit knocking/detonation under load or at part throttle
- Intermittent performance issues or rough running under certain conditions
What to check
- Connect a scan tool, read DTCs and view freeze frame/live data for knock sensor values
- Visually inspect sensor, connector, and wiring for damage, corrosion, looseness, or heat damage
- Wiggle harness and connector while monitoring live data to look for intermittent faults
- Backprobe signal and ground circuits; check for proper reference voltage and continuity to ECM
- Measure sensor resistance (if applicable) and compare to service data or expected behavior
- Use an oscilloscope to view sensor signal during cranking and under load, or tap test the block while monitoring
Signal parameters
- Sensor is typically piezoelectric; it produces AC pulses proportional to combustion vibration rather than a steady DC voltage
- At idle/no-knock the signal should be low and stable; during knock it should show distinct AC pulse bursts
- Some systems use a biased signal at the ECM — expect low-level AC riding on a reference bias; consult OEM data for exact voltages
- An open circuit, constant voltage (stuck high), or excessive noise indicate circuit/sensor issues
Diagnostic algorithm
- Retrieve freeze frame and related codes; clear codes and road test to confirm reproducibility.
- Visually inspect sensor, mounting bolt, and harness for obvious damage or loose mounting.
- With connector disconnected, check sensor wiring continuity to the ECM and for shorts to ground or battery using a DMM.
- Reconnect and backprobe signal and ground; monitor signal with a suitable scan tool or oscilloscope while cranking and under load. Look for expected low idle noise and distinct pulses when inducing knock (tap test).
- If signal absent or clearly incorrect and wiring is good, replace sensor and retest.
- If new sensor fails to restore proper signal, trace and repair wiring/connector faults or suspect ECM input circuit — consult manufacturer diagnostics before replacing ECM.
- After repair, erase codes and verify repair with a road test under the conditions that originally set the code.
Likely causes
- Wiring harness damage at sensor (chafing, heat exposure, connector corrosion)
- Failed knock sensor element (common failure item)
- Incorrect or loose sensor mounting (results in poor coupling to block)
- Poor ground or connector contact at sensor or ECM
- Intermittent short to power or ground in signal circuit
Fault status
Status
Knock/Combustion Vibration Sensor A Circuit Range/Performance — sensor signal out of expected range or not behaving as expected, may cause timing retard and MIL illumination.
Repair difficulty: Medium
Diagnostic time: 0.5-2.5 hours
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