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Home / DTC / P0325 — Knock/Combustion Vibration Sensor A Circuit

P0325 — Knock/Combustion Vibration Sensor A Circuit

Detailed page for trouble code P0325.

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10,551generic
22,461specific
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Code

P0325

Generic P — Powertrain

Knock/Combustion Vibration Sensor A Circuit

Brand: Generic
Type: P — Powertrain
Views: UK: 17 EN: 31 RU: 27
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or shorted wiring between knock sensor A and ECM
  • Corroded, loose, or damaged sensor connector
  • Failed knock (vibration) sensor
  • Sensor mounted loosely, on wrong surface, or missing mounting hardware
  • Engine mechanical noise or missing/damaged sensor mounting boss
  • ECM input circuit fault or internal ECM failure

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Engine pinging/knock under load or during acceleration
  • Reduced engine performance or retarded ignition timing
  • Poor fuel economy
  • Rough idle or hesitation
  • Intermittent drivability complaints if signal is erratic

What to check

  • Read and record freeze frame and live data (knock sensor status, engine speed, load)
  • Visual inspection of sensor, connector, and wiring for heat damage, oil, corrosion, chafing or breaks
  • Wiggle-test wiring and connector while monitoring for changes in live data or DTCs
  • Check sensor mounting: correct location and torque to engine block/head
  • Verify vehicle-specific reference voltages and grounds at the connector
  • Use an oscilloscope or high-quality DVOM to check for sensor signal while cranking and under load

Signal parameters

  • Passive (piezo) type: no steady DC output; generates AC voltage pulses when knock occurs — expected pulse amplitude typically ~0.05–3.0 V peak during knock events (varies by application)
  • Active (amplified) type: usually provides a varying DC-level signal within ~0.5–4.5 V range (manufacturer-specific)
  • Typical wiring: 2-wire (signal + ground) or 3-wire (signal + reference + ground) depending on vehicle
  • Continuity: short to ground or to power is a fault; open-circuit indicates broken wiring or failed sensor
  • Resistance: many piezo sensors have no meaningful DC resistance specification — consult vehicle service data before relying on ohms checks

Diagnostic algorithm

  1. Review freeze frame and live data for engine speed/load when code set; note whether code is steady or intermittent.
  2. Perform a visual inspection of sensor and harness; repair any obvious damage and retest.
  3. With connector disconnected, inspect pins for corrosion, bent pins, and presence of reference/ground circuits using a DVOM.
  4. Check continuity between sensor connector and ECM pin; repair any open or high-resistance circuits.
  5. Check for short to ground or battery using resistance and back-probing (power off) — isolate harness if short suspected.
  6. If available, use an oscilloscope to view sensor output while inducing a knock (lightly tap the appropriate area with a soft-faced hammer) and while driving under load; compare to a good-channel reference.
  7. If sensor is passive and no pulses are seen but wiring is good, replace the sensor.
  8. If sensor output is present but ECM still flags the circuit, verify ECM grounds and reference voltages; consider ECM input fault if wiring and sensor are confirmed good.
  9. After repairs, clear DTCs and perform a road test under conditions that previously reproduced the code; verify code does not return.

Likely causes

  • Broken/frayed wire near the sensor (heat or abrasion)
  • Connector pin corrosion or bent terminal
  • Sensor element failed (no output or intermittent)
  • Sensor ground or reference not present
  • Sensor not tightened to recommended torque or mounted on non-designated area
  • PCM or powertrain ground issue affecting signal reference

Fault status

⚠️ Status
Knock/Combustion Vibration Sensor A circuit fault detected — open, short, no activity, or out-of-range signal. ECM may disable knock control until fault is resolved.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

P0326 P0327 P0328 P0329 P0330 P0335
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Code

P0325

GWM P — Powertrain

- Malfunction in chain 1 of the knock sensor (bank 1 or sensor)

Brand: GWM
Type: P — Powertrain
Views: UK: 6 EN: 6 RU: 3
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or shorted wiring between knock sensor A and ECM
  • Corroded, loose, or damaged sensor connector
  • Failed knock (vibration) sensor
  • Sensor mounted loosely, on wrong surface, or missing mounting hardware
  • Engine mechanical noise or missing/damaged sensor mounting boss
  • ECM input circuit fault or internal ECM failure

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Engine pinging/knock under load or during acceleration
  • Reduced engine performance or retarded ignition timing
  • Poor fuel economy
  • Rough idle or hesitation
  • Intermittent drivability complaints if signal is erratic

What to check

  • Read and record freeze frame and live data (knock sensor status, engine speed, load)
  • Visual inspection of sensor, connector, and wiring for heat damage, oil, corrosion, chafing or breaks
  • Wiggle-test wiring and connector while monitoring for changes in live data or DTCs
  • Check sensor mounting: correct location and torque to engine block/head
  • Verify vehicle-specific reference voltages and grounds at the connector
  • Use an oscilloscope or high-quality DVOM to check for sensor signal while cranking and under load

Signal parameters

  • Passive (piezo) type: no steady DC output; generates AC voltage pulses when knock occurs — expected pulse amplitude typically ~0.05–3.0 V peak during knock events (varies by application)
  • Active (amplified) type: usually provides a varying DC-level signal within ~0.5–4.5 V range (manufacturer-specific)
  • Typical wiring: 2-wire (signal + ground) or 3-wire (signal + reference + ground) depending on vehicle
  • Continuity: short to ground or to power is a fault; open-circuit indicates broken wiring or failed sensor
  • Resistance: many piezo sensors have no meaningful DC resistance specification — consult vehicle service data before relying on ohms checks

Diagnostic algorithm

  1. Review freeze frame and live data for engine speed/load when code set; note whether code is steady or intermittent.
  2. Perform a visual inspection of sensor and harness; repair any obvious damage and retest.
  3. With connector disconnected, inspect pins for corrosion, bent pins, and presence of reference/ground circuits using a DVOM.
  4. Check continuity between sensor connector and ECM pin; repair any open or high-resistance circuits.
  5. Check for short to ground or battery using resistance and back-probing (power off) — isolate harness if short suspected.
  6. If available, use an oscilloscope to view sensor output while inducing a knock (lightly tap the appropriate area with a soft-faced hammer) and while driving under load; compare to a good-channel reference.
  7. If sensor is passive and no pulses are seen but wiring is good, replace the sensor.
  8. If sensor output is present but ECM still flags the circuit, verify ECM grounds and reference voltages; consider ECM input fault if wiring and sensor are confirmed good.
  9. After repairs, clear DTCs and perform a road test under conditions that previously reproduced the code; verify code does not return.

Likely causes

  • Broken/frayed wire near the sensor (heat or abrasion)
  • Connector pin corrosion or bent terminal
  • Sensor element failed (no output or intermittent)
  • Sensor ground or reference not present
  • Sensor not tightened to recommended torque or mounted on non-designated area
  • PCM or powertrain ground issue affecting signal reference

Fault status

⚠️ Status
Knock/Combustion Vibration Sensor A circuit fault detected — open, short, no activity, or out-of-range signal. ECM may disable knock control until fault is resolved.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

P0326 P0327 P0328 P0329 P0330 P0335
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P0325

HUMMER P — Powertrain

PCM Knock Sensor Circuit

Brand: HUMMER
Type: P — Powertrain
Views: UK: 9 EN: 15 RU: 12
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or shorted wiring between knock sensor A and ECM
  • Corroded, loose, or damaged sensor connector
  • Failed knock (vibration) sensor
  • Sensor mounted loosely, on wrong surface, or missing mounting hardware
  • Engine mechanical noise or missing/damaged sensor mounting boss
  • ECM input circuit fault or internal ECM failure

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Engine pinging/knock under load or during acceleration
  • Reduced engine performance or retarded ignition timing
  • Poor fuel economy
  • Rough idle or hesitation
  • Intermittent drivability complaints if signal is erratic

What to check

  • Read and record freeze frame and live data (knock sensor status, engine speed, load)
  • Visual inspection of sensor, connector, and wiring for heat damage, oil, corrosion, chafing or breaks
  • Wiggle-test wiring and connector while monitoring for changes in live data or DTCs
  • Check sensor mounting: correct location and torque to engine block/head
  • Verify vehicle-specific reference voltages and grounds at the connector
  • Use an oscilloscope or high-quality DVOM to check for sensor signal while cranking and under load

Signal parameters

  • Passive (piezo) type: no steady DC output; generates AC voltage pulses when knock occurs — expected pulse amplitude typically ~0.05–3.0 V peak during knock events (varies by application)
  • Active (amplified) type: usually provides a varying DC-level signal within ~0.5–4.5 V range (manufacturer-specific)
  • Typical wiring: 2-wire (signal + ground) or 3-wire (signal + reference + ground) depending on vehicle
  • Continuity: short to ground or to power is a fault; open-circuit indicates broken wiring or failed sensor
  • Resistance: many piezo sensors have no meaningful DC resistance specification — consult vehicle service data before relying on ohms checks

Diagnostic algorithm

  1. Review freeze frame and live data for engine speed/load when code set; note whether code is steady or intermittent.
  2. Perform a visual inspection of sensor and harness; repair any obvious damage and retest.
  3. With connector disconnected, inspect pins for corrosion, bent pins, and presence of reference/ground circuits using a DVOM.
  4. Check continuity between sensor connector and ECM pin; repair any open or high-resistance circuits.
  5. Check for short to ground or battery using resistance and back-probing (power off) — isolate harness if short suspected.
  6. If available, use an oscilloscope to view sensor output while inducing a knock (lightly tap the appropriate area with a soft-faced hammer) and while driving under load; compare to a good-channel reference.
  7. If sensor is passive and no pulses are seen but wiring is good, replace the sensor.
  8. If sensor output is present but ECM still flags the circuit, verify ECM grounds and reference voltages; consider ECM input fault if wiring and sensor are confirmed good.
  9. After repairs, clear DTCs and perform a road test under conditions that previously reproduced the code; verify code does not return.

Likely causes

  • Broken/frayed wire near the sensor (heat or abrasion)
  • Connector pin corrosion or bent terminal
  • Sensor element failed (no output or intermittent)
  • Sensor ground or reference not present
  • Sensor not tightened to recommended torque or mounted on non-designated area
  • PCM or powertrain ground issue affecting signal reference

Fault status

⚠️ Status
Knock/Combustion Vibration Sensor A circuit fault detected — open, short, no activity, or out-of-range signal. ECM may disable knock control until fault is resolved.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

P0326 P0327 P0328 P0329 P0330 P0335
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P0325

LAND ROVER P — Powertrain

Malfunction in knock sensor 1

Brand: LAND ROVER
Type: P — Powertrain
Views: UK: 8 EN: 12 RU: 11
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or shorted wiring between knock sensor A and ECM
  • Corroded, loose, or damaged sensor connector
  • Failed knock (vibration) sensor
  • Sensor mounted loosely, on wrong surface, or missing mounting hardware
  • Engine mechanical noise or missing/damaged sensor mounting boss
  • ECM input circuit fault or internal ECM failure

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Engine pinging/knock under load or during acceleration
  • Reduced engine performance or retarded ignition timing
  • Poor fuel economy
  • Rough idle or hesitation
  • Intermittent drivability complaints if signal is erratic

What to check

  • Read and record freeze frame and live data (knock sensor status, engine speed, load)
  • Visual inspection of sensor, connector, and wiring for heat damage, oil, corrosion, chafing or breaks
  • Wiggle-test wiring and connector while monitoring for changes in live data or DTCs
  • Check sensor mounting: correct location and torque to engine block/head
  • Verify vehicle-specific reference voltages and grounds at the connector
  • Use an oscilloscope or high-quality DVOM to check for sensor signal while cranking and under load

Signal parameters

  • Passive (piezo) type: no steady DC output; generates AC voltage pulses when knock occurs — expected pulse amplitude typically ~0.05–3.0 V peak during knock events (varies by application)
  • Active (amplified) type: usually provides a varying DC-level signal within ~0.5–4.5 V range (manufacturer-specific)
  • Typical wiring: 2-wire (signal + ground) or 3-wire (signal + reference + ground) depending on vehicle
  • Continuity: short to ground or to power is a fault; open-circuit indicates broken wiring or failed sensor
  • Resistance: many piezo sensors have no meaningful DC resistance specification — consult vehicle service data before relying on ohms checks

Diagnostic algorithm

  1. Review freeze frame and live data for engine speed/load when code set; note whether code is steady or intermittent.
  2. Perform a visual inspection of sensor and harness; repair any obvious damage and retest.
  3. With connector disconnected, inspect pins for corrosion, bent pins, and presence of reference/ground circuits using a DVOM.
  4. Check continuity between sensor connector and ECM pin; repair any open or high-resistance circuits.
  5. Check for short to ground or battery using resistance and back-probing (power off) — isolate harness if short suspected.
  6. If available, use an oscilloscope to view sensor output while inducing a knock (lightly tap the appropriate area with a soft-faced hammer) and while driving under load; compare to a good-channel reference.
  7. If sensor is passive and no pulses are seen but wiring is good, replace the sensor.
  8. If sensor output is present but ECM still flags the circuit, verify ECM grounds and reference voltages; consider ECM input fault if wiring and sensor are confirmed good.
  9. After repairs, clear DTCs and perform a road test under conditions that previously reproduced the code; verify code does not return.

Likely causes

  • Broken/frayed wire near the sensor (heat or abrasion)
  • Connector pin corrosion or bent terminal
  • Sensor element failed (no output or intermittent)
  • Sensor ground or reference not present
  • Sensor not tightened to recommended torque or mounted on non-designated area
  • PCM or powertrain ground issue affecting signal reference

Fault status

⚠️ Status
Knock/Combustion Vibration Sensor A circuit fault detected — open, short, no activity, or out-of-range signal. ECM may disable knock control until fault is resolved.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

P0326 P0327 P0328 P0329 P0330 P0335
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Code

P0325

MITSUBISHI P — Powertrain

Detonation sensor

Brand: MITSUBISHI
Type: P — Powertrain
Views: UK: 9 EN: 14 RU: 12
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or shorted wiring between knock sensor A and ECM
  • Corroded, loose, or damaged sensor connector
  • Failed knock (vibration) sensor
  • Sensor mounted loosely, on wrong surface, or missing mounting hardware
  • Engine mechanical noise or missing/damaged sensor mounting boss
  • ECM input circuit fault or internal ECM failure

Symptoms

  • Malfunction Indicator Lamp (MIL) illuminated
  • Engine pinging/knock under load or during acceleration
  • Reduced engine performance or retarded ignition timing
  • Poor fuel economy
  • Rough idle or hesitation
  • Intermittent drivability complaints if signal is erratic

What to check

  • Read and record freeze frame and live data (knock sensor status, engine speed, load)
  • Visual inspection of sensor, connector, and wiring for heat damage, oil, corrosion, chafing or breaks
  • Wiggle-test wiring and connector while monitoring for changes in live data or DTCs
  • Check sensor mounting: correct location and torque to engine block/head
  • Verify vehicle-specific reference voltages and grounds at the connector
  • Use an oscilloscope or high-quality DVOM to check for sensor signal while cranking and under load

Signal parameters

  • Passive (piezo) type: no steady DC output; generates AC voltage pulses when knock occurs — expected pulse amplitude typically ~0.05–3.0 V peak during knock events (varies by application)
  • Active (amplified) type: usually provides a varying DC-level signal within ~0.5–4.5 V range (manufacturer-specific)
  • Typical wiring: 2-wire (signal + ground) or 3-wire (signal + reference + ground) depending on vehicle
  • Continuity: short to ground or to power is a fault; open-circuit indicates broken wiring or failed sensor
  • Resistance: many piezo sensors have no meaningful DC resistance specification — consult vehicle service data before relying on ohms checks

Diagnostic algorithm

  1. Review freeze frame and live data for engine speed/load when code set; note whether code is steady or intermittent.
  2. Perform a visual inspection of sensor and harness; repair any obvious damage and retest.
  3. With connector disconnected, inspect pins for corrosion, bent pins, and presence of reference/ground circuits using a DVOM.
  4. Check continuity between sensor connector and ECM pin; repair any open or high-resistance circuits.
  5. Check for short to ground or battery using resistance and back-probing (power off) — isolate harness if short suspected.
  6. If available, use an oscilloscope to view sensor output while inducing a knock (lightly tap the appropriate area with a soft-faced hammer) and while driving under load; compare to a good-channel reference.
  7. If sensor is passive and no pulses are seen but wiring is good, replace the sensor.
  8. If sensor output is present but ECM still flags the circuit, verify ECM grounds and reference voltages; consider ECM input fault if wiring and sensor are confirmed good.
  9. After repairs, clear DTCs and perform a road test under conditions that previously reproduced the code; verify code does not return.

Likely causes

  • Broken/frayed wire near the sensor (heat or abrasion)
  • Connector pin corrosion or bent terminal
  • Sensor element failed (no output or intermittent)
  • Sensor ground or reference not present
  • Sensor not tightened to recommended torque or mounted on non-designated area
  • PCM or powertrain ground issue affecting signal reference

Fault status

⚠️ Status
Knock/Combustion Vibration Sensor A circuit fault detected — open, short, no activity, or out-of-range signal. ECM may disable knock control until fault is resolved.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0-2.5 hours

Similar codes

P0326 P0327 P0328 P0329 P0330 P0335
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