Code
P1324
ACURA
P — Powertrain
Knock Sensor Power Source Circuit Low Voltage
Views:
UK: 19
EN: 33
RU: 20
AI status
Completed
Completed
100%
Causes
- Open or short in knock sensor power/bias wiring
- Poor or corroded connector contact at sensor or ECM
- Faulty knock sensor
- Faulty ECM or degraded internal reference/bias supply
- Blown fuse or fusible link on sensor/ECM power feed
- Low battery voltage or poor battery/charging system
Symptoms
- Check Engine Light (MIL) illuminated
- Reduced engine power or hesitation due to timing retard
- Engine knock/pinging under load (if knock sensing disabled)
- Poor fuel economy
- Occasional misfire or rough idle (depending on related faults)
What to check
- Read freeze frame and live data for knock sensor status and related codes
- Visually inspect knock sensor connector and wiring for corrosion, damage or oil contamination
- Check battery voltage and charging system condition
- Verify relevant fuses and fusible links are intact
- Backprobing: measure reference/bias voltage at the sensor connector with ignition ON
- Measure continuity between sensor connector and ECM connector, and check for short to ground/12V
Signal parameters
- Reference/bias voltage at sensor connector with key ON: approximately 4.5–5.0 V (confirm with factory service data)
- Sensor output: small AC voltage (millivolt range) when engine is running and knock is present; should not be stuck at 0 V
- Connector pin continuity: near 0 ohms between sensor pin and ECM pin (manufacturer spec)
- Check for no short to ground or 12 V on the power/bias line
Diagnostic algorithm
- Retrieve codes and freeze frame; note conditions when fault set (engine load, RPM, temp).
- Clear code and attempt to re-create while monitoring live data for knock sensor voltage and reference/bias. If code returns, proceed.
- Visually inspect sensor, connector, and wiring for damage, corrosion, oil, or contaminants. Repair as needed.
- With ignition ON (engine off), backprobe the sensor connector and measure the reference/bias voltage. If low or absent, check related fuses and power feeds to the ECM.
- Check continuity from the sensor connector power/bias pin to the ECM connector pin. Repair any open or high-resistance sections.
- Check for shorts: measure resistance from the bias/power circuit to ground and to battery positive. Repair insulation or shorts if found.
- If wiring and power are good, disconnect the sensor and measure sensor resistance/output per service manual or substitute a known-good sensor to verify operation.
- If a wiring harness repair was performed, ensure secure, sealed connections and protect the harness from heat/abrasion; clear codes and perform road test.
- If the supply remains low with verified wiring and a known-good sensor, suspect ECM internal fault and consider ECM bench testing or replacement as per manufacturer guidance.
- Safety note: avoid shorting harness pins; disconnect battery if performing major repairs to wiring or ECM.
Likely causes
- Corroded/damaged sensor connector or wiring insulation
- Broken wire or pinched harness near engine or CV boot area
- Failed knock sensor (open/low output or internal short)
- Faulty ground at engine/ECM causing low circuit voltage
- Blown/loose fuse for ECM power/reference circuit
Fault status
Status
Knock Sensor Power Source Circuit Low Voltage — ECM detected low voltage on the knock sensor bias/power circuit. Knock sensing may be disabled and engine timing may be retarded until the issue is corrected.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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Code
P1324
BUICK
P — Powertrain
Crank RPM Too Low
Views:
UK: 15
EN: 24
RU: 18
AI status
Completed
Completed
100%
Causes
- Open or short in knock sensor power/bias wiring
- Poor or corroded connector contact at sensor or ECM
- Faulty knock sensor
- Faulty ECM or degraded internal reference/bias supply
- Blown fuse or fusible link on sensor/ECM power feed
- Low battery voltage or poor battery/charging system
Symptoms
- Check Engine Light (MIL) illuminated
- Reduced engine power or hesitation due to timing retard
- Engine knock/pinging under load (if knock sensing disabled)
- Poor fuel economy
- Occasional misfire or rough idle (depending on related faults)
What to check
- Read freeze frame and live data for knock sensor status and related codes
- Visually inspect knock sensor connector and wiring for corrosion, damage or oil contamination
- Check battery voltage and charging system condition
- Verify relevant fuses and fusible links are intact
- Backprobing: measure reference/bias voltage at the sensor connector with ignition ON
- Measure continuity between sensor connector and ECM connector, and check for short to ground/12V
Signal parameters
- Reference/bias voltage at sensor connector with key ON: approximately 4.5–5.0 V (confirm with factory service data)
- Sensor output: small AC voltage (millivolt range) when engine is running and knock is present; should not be stuck at 0 V
- Connector pin continuity: near 0 ohms between sensor pin and ECM pin (manufacturer spec)
- Check for no short to ground or 12 V on the power/bias line
Diagnostic algorithm
- Retrieve codes and freeze frame; note conditions when fault set (engine load, RPM, temp).
- Clear code and attempt to re-create while monitoring live data for knock sensor voltage and reference/bias. If code returns, proceed.
- Visually inspect sensor, connector, and wiring for damage, corrosion, oil, or contaminants. Repair as needed.
- With ignition ON (engine off), backprobe the sensor connector and measure the reference/bias voltage. If low or absent, check related fuses and power feeds to the ECM.
- Check continuity from the sensor connector power/bias pin to the ECM connector pin. Repair any open or high-resistance sections.
- Check for shorts: measure resistance from the bias/power circuit to ground and to battery positive. Repair insulation or shorts if found.
- If wiring and power are good, disconnect the sensor and measure sensor resistance/output per service manual or substitute a known-good sensor to verify operation.
- If a wiring harness repair was performed, ensure secure, sealed connections and protect the harness from heat/abrasion; clear codes and perform road test.
- If the supply remains low with verified wiring and a known-good sensor, suspect ECM internal fault and consider ECM bench testing or replacement as per manufacturer guidance.
- Safety note: avoid shorting harness pins; disconnect battery if performing major repairs to wiring or ECM.
Likely causes
- Corroded/damaged sensor connector or wiring insulation
- Broken wire or pinched harness near engine or CV boot area
- Failed knock sensor (open/low output or internal short)
- Faulty ground at engine/ECM causing low circuit voltage
- Blown/loose fuse for ECM power/reference circuit
Fault status
Status
Knock Sensor Power Source Circuit Low Voltage — ECM detected low voltage on the knock sensor bias/power circuit. Knock sensing may be disabled and engine timing may be retarded until the issue is corrected.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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Code
P1324
CADILLAC
P — Powertrain
Crank RPM Too Low
Views:
UK: 19
EN: 45
RU: 22
AI status
Completed
Completed
100%
Causes
- Open or short in knock sensor power/bias wiring
- Poor or corroded connector contact at sensor or ECM
- Faulty knock sensor
- Faulty ECM or degraded internal reference/bias supply
- Blown fuse or fusible link on sensor/ECM power feed
- Low battery voltage or poor battery/charging system
Symptoms
- Check Engine Light (MIL) illuminated
- Reduced engine power or hesitation due to timing retard
- Engine knock/pinging under load (if knock sensing disabled)
- Poor fuel economy
- Occasional misfire or rough idle (depending on related faults)
What to check
- Read freeze frame and live data for knock sensor status and related codes
- Visually inspect knock sensor connector and wiring for corrosion, damage or oil contamination
- Check battery voltage and charging system condition
- Verify relevant fuses and fusible links are intact
- Backprobing: measure reference/bias voltage at the sensor connector with ignition ON
- Measure continuity between sensor connector and ECM connector, and check for short to ground/12V
Signal parameters
- Reference/bias voltage at sensor connector with key ON: approximately 4.5–5.0 V (confirm with factory service data)
- Sensor output: small AC voltage (millivolt range) when engine is running and knock is present; should not be stuck at 0 V
- Connector pin continuity: near 0 ohms between sensor pin and ECM pin (manufacturer spec)
- Check for no short to ground or 12 V on the power/bias line
Diagnostic algorithm
- Retrieve codes and freeze frame; note conditions when fault set (engine load, RPM, temp).
- Clear code and attempt to re-create while monitoring live data for knock sensor voltage and reference/bias. If code returns, proceed.
- Visually inspect sensor, connector, and wiring for damage, corrosion, oil, or contaminants. Repair as needed.
- With ignition ON (engine off), backprobe the sensor connector and measure the reference/bias voltage. If low or absent, check related fuses and power feeds to the ECM.
- Check continuity from the sensor connector power/bias pin to the ECM connector pin. Repair any open or high-resistance sections.
- Check for shorts: measure resistance from the bias/power circuit to ground and to battery positive. Repair insulation or shorts if found.
- If wiring and power are good, disconnect the sensor and measure sensor resistance/output per service manual or substitute a known-good sensor to verify operation.
- If a wiring harness repair was performed, ensure secure, sealed connections and protect the harness from heat/abrasion; clear codes and perform road test.
- If the supply remains low with verified wiring and a known-good sensor, suspect ECM internal fault and consider ECM bench testing or replacement as per manufacturer guidance.
- Safety note: avoid shorting harness pins; disconnect battery if performing major repairs to wiring or ECM.
Likely causes
- Corroded/damaged sensor connector or wiring insulation
- Broken wire or pinched harness near engine or CV boot area
- Failed knock sensor (open/low output or internal short)
- Faulty ground at engine/ECM causing low circuit voltage
- Blown/loose fuse for ECM power/reference circuit
Fault status
Status
Knock Sensor Power Source Circuit Low Voltage — ECM detected low voltage on the knock sensor bias/power circuit. Knock sensing may be disabled and engine timing may be retarded until the issue is corrected.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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Code
P1324
CHEVROLET
P — Powertrain
Crank RPM Too Low
Views:
UK: 14
EN: 25
RU: 19
AI status
Completed
Completed
100%
Causes
- Open or short in knock sensor power/bias wiring
- Poor or corroded connector contact at sensor or ECM
- Faulty knock sensor
- Faulty ECM or degraded internal reference/bias supply
- Blown fuse or fusible link on sensor/ECM power feed
- Low battery voltage or poor battery/charging system
Symptoms
- Check Engine Light (MIL) illuminated
- Reduced engine power or hesitation due to timing retard
- Engine knock/pinging under load (if knock sensing disabled)
- Poor fuel economy
- Occasional misfire or rough idle (depending on related faults)
What to check
- Read freeze frame and live data for knock sensor status and related codes
- Visually inspect knock sensor connector and wiring for corrosion, damage or oil contamination
- Check battery voltage and charging system condition
- Verify relevant fuses and fusible links are intact
- Backprobing: measure reference/bias voltage at the sensor connector with ignition ON
- Measure continuity between sensor connector and ECM connector, and check for short to ground/12V
Signal parameters
- Reference/bias voltage at sensor connector with key ON: approximately 4.5–5.0 V (confirm with factory service data)
- Sensor output: small AC voltage (millivolt range) when engine is running and knock is present; should not be stuck at 0 V
- Connector pin continuity: near 0 ohms between sensor pin and ECM pin (manufacturer spec)
- Check for no short to ground or 12 V on the power/bias line
Diagnostic algorithm
- Retrieve codes and freeze frame; note conditions when fault set (engine load, RPM, temp).
- Clear code and attempt to re-create while monitoring live data for knock sensor voltage and reference/bias. If code returns, proceed.
- Visually inspect sensor, connector, and wiring for damage, corrosion, oil, or contaminants. Repair as needed.
- With ignition ON (engine off), backprobe the sensor connector and measure the reference/bias voltage. If low or absent, check related fuses and power feeds to the ECM.
- Check continuity from the sensor connector power/bias pin to the ECM connector pin. Repair any open or high-resistance sections.
- Check for shorts: measure resistance from the bias/power circuit to ground and to battery positive. Repair insulation or shorts if found.
- If wiring and power are good, disconnect the sensor and measure sensor resistance/output per service manual or substitute a known-good sensor to verify operation.
- If a wiring harness repair was performed, ensure secure, sealed connections and protect the harness from heat/abrasion; clear codes and perform road test.
- If the supply remains low with verified wiring and a known-good sensor, suspect ECM internal fault and consider ECM bench testing or replacement as per manufacturer guidance.
- Safety note: avoid shorting harness pins; disconnect battery if performing major repairs to wiring or ECM.
Likely causes
- Corroded/damaged sensor connector or wiring insulation
- Broken wire or pinched harness near engine or CV boot area
- Failed knock sensor (open/low output or internal short)
- Faulty ground at engine/ECM causing low circuit voltage
- Blown/loose fuse for ECM power/reference circuit
Fault status
Status
Knock Sensor Power Source Circuit Low Voltage — ECM detected low voltage on the knock sensor bias/power circuit. Knock sensing may be disabled and engine timing may be retarded until the issue is corrected.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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Code
P1324
CHRYSLER
P — Powertrain
Crank RPM Too Low
Views:
UK: 20
EN: 29
RU: 22
AI status
Completed
Completed
100%
Causes
- Open or short in knock sensor power/bias wiring
- Poor or corroded connector contact at sensor or ECM
- Faulty knock sensor
- Faulty ECM or degraded internal reference/bias supply
- Blown fuse or fusible link on sensor/ECM power feed
- Low battery voltage or poor battery/charging system
Symptoms
- Check Engine Light (MIL) illuminated
- Reduced engine power or hesitation due to timing retard
- Engine knock/pinging under load (if knock sensing disabled)
- Poor fuel economy
- Occasional misfire or rough idle (depending on related faults)
What to check
- Read freeze frame and live data for knock sensor status and related codes
- Visually inspect knock sensor connector and wiring for corrosion, damage or oil contamination
- Check battery voltage and charging system condition
- Verify relevant fuses and fusible links are intact
- Backprobing: measure reference/bias voltage at the sensor connector with ignition ON
- Measure continuity between sensor connector and ECM connector, and check for short to ground/12V
Signal parameters
- Reference/bias voltage at sensor connector with key ON: approximately 4.5–5.0 V (confirm with factory service data)
- Sensor output: small AC voltage (millivolt range) when engine is running and knock is present; should not be stuck at 0 V
- Connector pin continuity: near 0 ohms between sensor pin and ECM pin (manufacturer spec)
- Check for no short to ground or 12 V on the power/bias line
Diagnostic algorithm
- Retrieve codes and freeze frame; note conditions when fault set (engine load, RPM, temp).
- Clear code and attempt to re-create while monitoring live data for knock sensor voltage and reference/bias. If code returns, proceed.
- Visually inspect sensor, connector, and wiring for damage, corrosion, oil, or contaminants. Repair as needed.
- With ignition ON (engine off), backprobe the sensor connector and measure the reference/bias voltage. If low or absent, check related fuses and power feeds to the ECM.
- Check continuity from the sensor connector power/bias pin to the ECM connector pin. Repair any open or high-resistance sections.
- Check for shorts: measure resistance from the bias/power circuit to ground and to battery positive. Repair insulation or shorts if found.
- If wiring and power are good, disconnect the sensor and measure sensor resistance/output per service manual or substitute a known-good sensor to verify operation.
- If a wiring harness repair was performed, ensure secure, sealed connections and protect the harness from heat/abrasion; clear codes and perform road test.
- If the supply remains low with verified wiring and a known-good sensor, suspect ECM internal fault and consider ECM bench testing or replacement as per manufacturer guidance.
- Safety note: avoid shorting harness pins; disconnect battery if performing major repairs to wiring or ECM.
Likely causes
- Corroded/damaged sensor connector or wiring insulation
- Broken wire or pinched harness near engine or CV boot area
- Failed knock sensor (open/low output or internal short)
- Faulty ground at engine/ECM causing low circuit voltage
- Blown/loose fuse for ECM power/reference circuit
Fault status
Status
Knock Sensor Power Source Circuit Low Voltage — ECM detected low voltage on the knock sensor bias/power circuit. Knock sensing may be disabled and engine timing may be retarded until the issue is corrected.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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Code
P1324
DAEWOO
P — Powertrain
PRE - HEATER RELAY MAL
Views:
UK: 2
EN: 4
RU: 1
AI status
Completed
Completed
100%
Causes
- Open or short in knock sensor power/bias wiring
- Poor or corroded connector contact at sensor or ECM
- Faulty knock sensor
- Faulty ECM or degraded internal reference/bias supply
- Blown fuse or fusible link on sensor/ECM power feed
- Low battery voltage or poor battery/charging system
Symptoms
- Check Engine Light (MIL) illuminated
- Reduced engine power or hesitation due to timing retard
- Engine knock/pinging under load (if knock sensing disabled)
- Poor fuel economy
- Occasional misfire or rough idle (depending on related faults)
What to check
- Read freeze frame and live data for knock sensor status and related codes
- Visually inspect knock sensor connector and wiring for corrosion, damage or oil contamination
- Check battery voltage and charging system condition
- Verify relevant fuses and fusible links are intact
- Backprobing: measure reference/bias voltage at the sensor connector with ignition ON
- Measure continuity between sensor connector and ECM connector, and check for short to ground/12V
Signal parameters
- Reference/bias voltage at sensor connector with key ON: approximately 4.5–5.0 V (confirm with factory service data)
- Sensor output: small AC voltage (millivolt range) when engine is running and knock is present; should not be stuck at 0 V
- Connector pin continuity: near 0 ohms between sensor pin and ECM pin (manufacturer spec)
- Check for no short to ground or 12 V on the power/bias line
Diagnostic algorithm
- Retrieve codes and freeze frame; note conditions when fault set (engine load, RPM, temp).
- Clear code and attempt to re-create while monitoring live data for knock sensor voltage and reference/bias. If code returns, proceed.
- Visually inspect sensor, connector, and wiring for damage, corrosion, oil, or contaminants. Repair as needed.
- With ignition ON (engine off), backprobe the sensor connector and measure the reference/bias voltage. If low or absent, check related fuses and power feeds to the ECM.
- Check continuity from the sensor connector power/bias pin to the ECM connector pin. Repair any open or high-resistance sections.
- Check for shorts: measure resistance from the bias/power circuit to ground and to battery positive. Repair insulation or shorts if found.
- If wiring and power are good, disconnect the sensor and measure sensor resistance/output per service manual or substitute a known-good sensor to verify operation.
- If a wiring harness repair was performed, ensure secure, sealed connections and protect the harness from heat/abrasion; clear codes and perform road test.
- If the supply remains low with verified wiring and a known-good sensor, suspect ECM internal fault and consider ECM bench testing or replacement as per manufacturer guidance.
- Safety note: avoid shorting harness pins; disconnect battery if performing major repairs to wiring or ECM.
Likely causes
- Corroded/damaged sensor connector or wiring insulation
- Broken wire or pinched harness near engine or CV boot area
- Failed knock sensor (open/low output or internal short)
- Faulty ground at engine/ECM causing low circuit voltage
- Blown/loose fuse for ECM power/reference circuit
Fault status
Status
Knock Sensor Power Source Circuit Low Voltage — ECM detected low voltage on the knock sensor bias/power circuit. Knock sensing may be disabled and engine timing may be retarded until the issue is corrected.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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Code
P1324
GM
P — Powertrain
Crank RPM Too Low
Views:
UK: 15
EN: 25
RU: 17
AI status
Completed
Completed
100%
Causes
- Open or short in knock sensor power/bias wiring
- Poor or corroded connector contact at sensor or ECM
- Faulty knock sensor
- Faulty ECM or degraded internal reference/bias supply
- Blown fuse or fusible link on sensor/ECM power feed
- Low battery voltage or poor battery/charging system
Symptoms
- Check Engine Light (MIL) illuminated
- Reduced engine power or hesitation due to timing retard
- Engine knock/pinging under load (if knock sensing disabled)
- Poor fuel economy
- Occasional misfire or rough idle (depending on related faults)
What to check
- Read freeze frame and live data for knock sensor status and related codes
- Visually inspect knock sensor connector and wiring for corrosion, damage or oil contamination
- Check battery voltage and charging system condition
- Verify relevant fuses and fusible links are intact
- Backprobing: measure reference/bias voltage at the sensor connector with ignition ON
- Measure continuity between sensor connector and ECM connector, and check for short to ground/12V
Signal parameters
- Reference/bias voltage at sensor connector with key ON: approximately 4.5–5.0 V (confirm with factory service data)
- Sensor output: small AC voltage (millivolt range) when engine is running and knock is present; should not be stuck at 0 V
- Connector pin continuity: near 0 ohms between sensor pin and ECM pin (manufacturer spec)
- Check for no short to ground or 12 V on the power/bias line
Diagnostic algorithm
- Retrieve codes and freeze frame; note conditions when fault set (engine load, RPM, temp).
- Clear code and attempt to re-create while monitoring live data for knock sensor voltage and reference/bias. If code returns, proceed.
- Visually inspect sensor, connector, and wiring for damage, corrosion, oil, or contaminants. Repair as needed.
- With ignition ON (engine off), backprobe the sensor connector and measure the reference/bias voltage. If low or absent, check related fuses and power feeds to the ECM.
- Check continuity from the sensor connector power/bias pin to the ECM connector pin. Repair any open or high-resistance sections.
- Check for shorts: measure resistance from the bias/power circuit to ground and to battery positive. Repair insulation or shorts if found.
- If wiring and power are good, disconnect the sensor and measure sensor resistance/output per service manual or substitute a known-good sensor to verify operation.
- If a wiring harness repair was performed, ensure secure, sealed connections and protect the harness from heat/abrasion; clear codes and perform road test.
- If the supply remains low with verified wiring and a known-good sensor, suspect ECM internal fault and consider ECM bench testing or replacement as per manufacturer guidance.
- Safety note: avoid shorting harness pins; disconnect battery if performing major repairs to wiring or ECM.
Likely causes
- Corroded/damaged sensor connector or wiring insulation
- Broken wire or pinched harness near engine or CV boot area
- Failed knock sensor (open/low output or internal short)
- Faulty ground at engine/ECM causing low circuit voltage
- Blown/loose fuse for ECM power/reference circuit
Fault status
Status
Knock Sensor Power Source Circuit Low Voltage — ECM detected low voltage on the knock sensor bias/power circuit. Knock sensing may be disabled and engine timing may be retarded until the issue is corrected.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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Code
P1324
GMC
P — Powertrain
Crank RPM Too Low
Views:
UK: 16
EN: 34
RU: 19
AI status
Completed
Completed
100%
Causes
- Open or short in knock sensor power/bias wiring
- Poor or corroded connector contact at sensor or ECM
- Faulty knock sensor
- Faulty ECM or degraded internal reference/bias supply
- Blown fuse or fusible link on sensor/ECM power feed
- Low battery voltage or poor battery/charging system
Symptoms
- Check Engine Light (MIL) illuminated
- Reduced engine power or hesitation due to timing retard
- Engine knock/pinging under load (if knock sensing disabled)
- Poor fuel economy
- Occasional misfire or rough idle (depending on related faults)
What to check
- Read freeze frame and live data for knock sensor status and related codes
- Visually inspect knock sensor connector and wiring for corrosion, damage or oil contamination
- Check battery voltage and charging system condition
- Verify relevant fuses and fusible links are intact
- Backprobing: measure reference/bias voltage at the sensor connector with ignition ON
- Measure continuity between sensor connector and ECM connector, and check for short to ground/12V
Signal parameters
- Reference/bias voltage at sensor connector with key ON: approximately 4.5–5.0 V (confirm with factory service data)
- Sensor output: small AC voltage (millivolt range) when engine is running and knock is present; should not be stuck at 0 V
- Connector pin continuity: near 0 ohms between sensor pin and ECM pin (manufacturer spec)
- Check for no short to ground or 12 V on the power/bias line
Diagnostic algorithm
- Retrieve codes and freeze frame; note conditions when fault set (engine load, RPM, temp).
- Clear code and attempt to re-create while monitoring live data for knock sensor voltage and reference/bias. If code returns, proceed.
- Visually inspect sensor, connector, and wiring for damage, corrosion, oil, or contaminants. Repair as needed.
- With ignition ON (engine off), backprobe the sensor connector and measure the reference/bias voltage. If low or absent, check related fuses and power feeds to the ECM.
- Check continuity from the sensor connector power/bias pin to the ECM connector pin. Repair any open or high-resistance sections.
- Check for shorts: measure resistance from the bias/power circuit to ground and to battery positive. Repair insulation or shorts if found.
- If wiring and power are good, disconnect the sensor and measure sensor resistance/output per service manual or substitute a known-good sensor to verify operation.
- If a wiring harness repair was performed, ensure secure, sealed connections and protect the harness from heat/abrasion; clear codes and perform road test.
- If the supply remains low with verified wiring and a known-good sensor, suspect ECM internal fault and consider ECM bench testing or replacement as per manufacturer guidance.
- Safety note: avoid shorting harness pins; disconnect battery if performing major repairs to wiring or ECM.
Likely causes
- Corroded/damaged sensor connector or wiring insulation
- Broken wire or pinched harness near engine or CV boot area
- Failed knock sensor (open/low output or internal short)
- Faulty ground at engine/ECM causing low circuit voltage
- Blown/loose fuse for ECM power/reference circuit
Fault status
Status
Knock Sensor Power Source Circuit Low Voltage — ECM detected low voltage on the knock sensor bias/power circuit. Knock sensing may be disabled and engine timing may be retarded until the issue is corrected.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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Code
P1324
HONDA
P — Powertrain
Knock Sensor Power Source Circuit Low Voltage
Views:
UK: 13
EN: 27
RU: 19
AI status
Completed
Completed
100%
Causes
- Open or short in knock sensor power/bias wiring
- Poor or corroded connector contact at sensor or ECM
- Faulty knock sensor
- Faulty ECM or degraded internal reference/bias supply
- Blown fuse or fusible link on sensor/ECM power feed
- Low battery voltage or poor battery/charging system
Symptoms
- Check Engine Light (MIL) illuminated
- Reduced engine power or hesitation due to timing retard
- Engine knock/pinging under load (if knock sensing disabled)
- Poor fuel economy
- Occasional misfire or rough idle (depending on related faults)
What to check
- Read freeze frame and live data for knock sensor status and related codes
- Visually inspect knock sensor connector and wiring for corrosion, damage or oil contamination
- Check battery voltage and charging system condition
- Verify relevant fuses and fusible links are intact
- Backprobing: measure reference/bias voltage at the sensor connector with ignition ON
- Measure continuity between sensor connector and ECM connector, and check for short to ground/12V
Signal parameters
- Reference/bias voltage at sensor connector with key ON: approximately 4.5–5.0 V (confirm with factory service data)
- Sensor output: small AC voltage (millivolt range) when engine is running and knock is present; should not be stuck at 0 V
- Connector pin continuity: near 0 ohms between sensor pin and ECM pin (manufacturer spec)
- Check for no short to ground or 12 V on the power/bias line
Diagnostic algorithm
- Retrieve codes and freeze frame; note conditions when fault set (engine load, RPM, temp).
- Clear code and attempt to re-create while monitoring live data for knock sensor voltage and reference/bias. If code returns, proceed.
- Visually inspect sensor, connector, and wiring for damage, corrosion, oil, or contaminants. Repair as needed.
- With ignition ON (engine off), backprobe the sensor connector and measure the reference/bias voltage. If low or absent, check related fuses and power feeds to the ECM.
- Check continuity from the sensor connector power/bias pin to the ECM connector pin. Repair any open or high-resistance sections.
- Check for shorts: measure resistance from the bias/power circuit to ground and to battery positive. Repair insulation or shorts if found.
- If wiring and power are good, disconnect the sensor and measure sensor resistance/output per service manual or substitute a known-good sensor to verify operation.
- If a wiring harness repair was performed, ensure secure, sealed connections and protect the harness from heat/abrasion; clear codes and perform road test.
- If the supply remains low with verified wiring and a known-good sensor, suspect ECM internal fault and consider ECM bench testing or replacement as per manufacturer guidance.
- Safety note: avoid shorting harness pins; disconnect battery if performing major repairs to wiring or ECM.
Likely causes
- Corroded/damaged sensor connector or wiring insulation
- Broken wire or pinched harness near engine or CV boot area
- Failed knock sensor (open/low output or internal short)
- Faulty ground at engine/ECM causing low circuit voltage
- Blown/loose fuse for ECM power/reference circuit
Fault status
Status
Knock Sensor Power Source Circuit Low Voltage — ECM detected low voltage on the knock sensor bias/power circuit. Knock sensing may be disabled and engine timing may be retarded until the issue is corrected.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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Code
P1324
HUMMER
P — Powertrain
Crank RPM Too Low
Views:
UK: 6
EN: 12
RU: 10
AI status
Completed
Completed
100%
Causes
- Open or short in knock sensor power/bias wiring
- Poor or corroded connector contact at sensor or ECM
- Faulty knock sensor
- Faulty ECM or degraded internal reference/bias supply
- Blown fuse or fusible link on sensor/ECM power feed
- Low battery voltage or poor battery/charging system
Symptoms
- Check Engine Light (MIL) illuminated
- Reduced engine power or hesitation due to timing retard
- Engine knock/pinging under load (if knock sensing disabled)
- Poor fuel economy
- Occasional misfire or rough idle (depending on related faults)
What to check
- Read freeze frame and live data for knock sensor status and related codes
- Visually inspect knock sensor connector and wiring for corrosion, damage or oil contamination
- Check battery voltage and charging system condition
- Verify relevant fuses and fusible links are intact
- Backprobing: measure reference/bias voltage at the sensor connector with ignition ON
- Measure continuity between sensor connector and ECM connector, and check for short to ground/12V
Signal parameters
- Reference/bias voltage at sensor connector with key ON: approximately 4.5–5.0 V (confirm with factory service data)
- Sensor output: small AC voltage (millivolt range) when engine is running and knock is present; should not be stuck at 0 V
- Connector pin continuity: near 0 ohms between sensor pin and ECM pin (manufacturer spec)
- Check for no short to ground or 12 V on the power/bias line
Diagnostic algorithm
- Retrieve codes and freeze frame; note conditions when fault set (engine load, RPM, temp).
- Clear code and attempt to re-create while monitoring live data for knock sensor voltage and reference/bias. If code returns, proceed.
- Visually inspect sensor, connector, and wiring for damage, corrosion, oil, or contaminants. Repair as needed.
- With ignition ON (engine off), backprobe the sensor connector and measure the reference/bias voltage. If low or absent, check related fuses and power feeds to the ECM.
- Check continuity from the sensor connector power/bias pin to the ECM connector pin. Repair any open or high-resistance sections.
- Check for shorts: measure resistance from the bias/power circuit to ground and to battery positive. Repair insulation or shorts if found.
- If wiring and power are good, disconnect the sensor and measure sensor resistance/output per service manual or substitute a known-good sensor to verify operation.
- If a wiring harness repair was performed, ensure secure, sealed connections and protect the harness from heat/abrasion; clear codes and perform road test.
- If the supply remains low with verified wiring and a known-good sensor, suspect ECM internal fault and consider ECM bench testing or replacement as per manufacturer guidance.
- Safety note: avoid shorting harness pins; disconnect battery if performing major repairs to wiring or ECM.
Likely causes
- Corroded/damaged sensor connector or wiring insulation
- Broken wire or pinched harness near engine or CV boot area
- Failed knock sensor (open/low output or internal short)
- Faulty ground at engine/ECM causing low circuit voltage
- Blown/loose fuse for ECM power/reference circuit
Fault status
Status
Knock Sensor Power Source Circuit Low Voltage — ECM detected low voltage on the knock sensor bias/power circuit. Knock sensing may be disabled and engine timing may be retarded until the issue is corrected.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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Code
P1324
INFINITI
P — Powertrain
Knock Sensor Power Source Circuit Low Voltage
Views:
UK: 18
EN: 29
RU: 19
AI status
Completed
Completed
100%
Causes
- Open or short in knock sensor power/bias wiring
- Poor or corroded connector contact at sensor or ECM
- Faulty knock sensor
- Faulty ECM or degraded internal reference/bias supply
- Blown fuse or fusible link on sensor/ECM power feed
- Low battery voltage or poor battery/charging system
Symptoms
- Check Engine Light (MIL) illuminated
- Reduced engine power or hesitation due to timing retard
- Engine knock/pinging under load (if knock sensing disabled)
- Poor fuel economy
- Occasional misfire or rough idle (depending on related faults)
What to check
- Read freeze frame and live data for knock sensor status and related codes
- Visually inspect knock sensor connector and wiring for corrosion, damage or oil contamination
- Check battery voltage and charging system condition
- Verify relevant fuses and fusible links are intact
- Backprobing: measure reference/bias voltage at the sensor connector with ignition ON
- Measure continuity between sensor connector and ECM connector, and check for short to ground/12V
Signal parameters
- Reference/bias voltage at sensor connector with key ON: approximately 4.5–5.0 V (confirm with factory service data)
- Sensor output: small AC voltage (millivolt range) when engine is running and knock is present; should not be stuck at 0 V
- Connector pin continuity: near 0 ohms between sensor pin and ECM pin (manufacturer spec)
- Check for no short to ground or 12 V on the power/bias line
Diagnostic algorithm
- Retrieve codes and freeze frame; note conditions when fault set (engine load, RPM, temp).
- Clear code and attempt to re-create while monitoring live data for knock sensor voltage and reference/bias. If code returns, proceed.
- Visually inspect sensor, connector, and wiring for damage, corrosion, oil, or contaminants. Repair as needed.
- With ignition ON (engine off), backprobe the sensor connector and measure the reference/bias voltage. If low or absent, check related fuses and power feeds to the ECM.
- Check continuity from the sensor connector power/bias pin to the ECM connector pin. Repair any open or high-resistance sections.
- Check for shorts: measure resistance from the bias/power circuit to ground and to battery positive. Repair insulation or shorts if found.
- If wiring and power are good, disconnect the sensor and measure sensor resistance/output per service manual or substitute a known-good sensor to verify operation.
- If a wiring harness repair was performed, ensure secure, sealed connections and protect the harness from heat/abrasion; clear codes and perform road test.
- If the supply remains low with verified wiring and a known-good sensor, suspect ECM internal fault and consider ECM bench testing or replacement as per manufacturer guidance.
- Safety note: avoid shorting harness pins; disconnect battery if performing major repairs to wiring or ECM.
Likely causes
- Corroded/damaged sensor connector or wiring insulation
- Broken wire or pinched harness near engine or CV boot area
- Failed knock sensor (open/low output or internal short)
- Faulty ground at engine/ECM causing low circuit voltage
- Blown/loose fuse for ECM power/reference circuit
Fault status
Status
Knock Sensor Power Source Circuit Low Voltage — ECM detected low voltage on the knock sensor bias/power circuit. Knock sensing may be disabled and engine timing may be retarded until the issue is corrected.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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Code
P1324
OLDSMOBILE
P — Powertrain
Crank RPM Too Low
Views:
UK: 16
EN: 28
RU: 22
AI status
Completed
Completed
100%
Causes
- Open or short in knock sensor power/bias wiring
- Poor or corroded connector contact at sensor or ECM
- Faulty knock sensor
- Faulty ECM or degraded internal reference/bias supply
- Blown fuse or fusible link on sensor/ECM power feed
- Low battery voltage or poor battery/charging system
Symptoms
- Check Engine Light (MIL) illuminated
- Reduced engine power or hesitation due to timing retard
- Engine knock/pinging under load (if knock sensing disabled)
- Poor fuel economy
- Occasional misfire or rough idle (depending on related faults)
What to check
- Read freeze frame and live data for knock sensor status and related codes
- Visually inspect knock sensor connector and wiring for corrosion, damage or oil contamination
- Check battery voltage and charging system condition
- Verify relevant fuses and fusible links are intact
- Backprobing: measure reference/bias voltage at the sensor connector with ignition ON
- Measure continuity between sensor connector and ECM connector, and check for short to ground/12V
Signal parameters
- Reference/bias voltage at sensor connector with key ON: approximately 4.5–5.0 V (confirm with factory service data)
- Sensor output: small AC voltage (millivolt range) when engine is running and knock is present; should not be stuck at 0 V
- Connector pin continuity: near 0 ohms between sensor pin and ECM pin (manufacturer spec)
- Check for no short to ground or 12 V on the power/bias line
Diagnostic algorithm
- Retrieve codes and freeze frame; note conditions when fault set (engine load, RPM, temp).
- Clear code and attempt to re-create while monitoring live data for knock sensor voltage and reference/bias. If code returns, proceed.
- Visually inspect sensor, connector, and wiring for damage, corrosion, oil, or contaminants. Repair as needed.
- With ignition ON (engine off), backprobe the sensor connector and measure the reference/bias voltage. If low or absent, check related fuses and power feeds to the ECM.
- Check continuity from the sensor connector power/bias pin to the ECM connector pin. Repair any open or high-resistance sections.
- Check for shorts: measure resistance from the bias/power circuit to ground and to battery positive. Repair insulation or shorts if found.
- If wiring and power are good, disconnect the sensor and measure sensor resistance/output per service manual or substitute a known-good sensor to verify operation.
- If a wiring harness repair was performed, ensure secure, sealed connections and protect the harness from heat/abrasion; clear codes and perform road test.
- If the supply remains low with verified wiring and a known-good sensor, suspect ECM internal fault and consider ECM bench testing or replacement as per manufacturer guidance.
- Safety note: avoid shorting harness pins; disconnect battery if performing major repairs to wiring or ECM.
Likely causes
- Corroded/damaged sensor connector or wiring insulation
- Broken wire or pinched harness near engine or CV boot area
- Failed knock sensor (open/low output or internal short)
- Faulty ground at engine/ECM causing low circuit voltage
- Blown/loose fuse for ECM power/reference circuit
Fault status
Status
Knock Sensor Power Source Circuit Low Voltage — ECM detected low voltage on the knock sensor bias/power circuit. Knock sensing may be disabled and engine timing may be retarded until the issue is corrected.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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Code
P1324
SATURN
P — Powertrain
Crank RPM Too Low
Views:
UK: 19
EN: 26
RU: 21
AI status
Completed
Completed
100%
Causes
- Open or short in knock sensor power/bias wiring
- Poor or corroded connector contact at sensor or ECM
- Faulty knock sensor
- Faulty ECM or degraded internal reference/bias supply
- Blown fuse or fusible link on sensor/ECM power feed
- Low battery voltage or poor battery/charging system
Symptoms
- Check Engine Light (MIL) illuminated
- Reduced engine power or hesitation due to timing retard
- Engine knock/pinging under load (if knock sensing disabled)
- Poor fuel economy
- Occasional misfire or rough idle (depending on related faults)
What to check
- Read freeze frame and live data for knock sensor status and related codes
- Visually inspect knock sensor connector and wiring for corrosion, damage or oil contamination
- Check battery voltage and charging system condition
- Verify relevant fuses and fusible links are intact
- Backprobing: measure reference/bias voltage at the sensor connector with ignition ON
- Measure continuity between sensor connector and ECM connector, and check for short to ground/12V
Signal parameters
- Reference/bias voltage at sensor connector with key ON: approximately 4.5–5.0 V (confirm with factory service data)
- Sensor output: small AC voltage (millivolt range) when engine is running and knock is present; should not be stuck at 0 V
- Connector pin continuity: near 0 ohms between sensor pin and ECM pin (manufacturer spec)
- Check for no short to ground or 12 V on the power/bias line
Diagnostic algorithm
- Retrieve codes and freeze frame; note conditions when fault set (engine load, RPM, temp).
- Clear code and attempt to re-create while monitoring live data for knock sensor voltage and reference/bias. If code returns, proceed.
- Visually inspect sensor, connector, and wiring for damage, corrosion, oil, or contaminants. Repair as needed.
- With ignition ON (engine off), backprobe the sensor connector and measure the reference/bias voltage. If low or absent, check related fuses and power feeds to the ECM.
- Check continuity from the sensor connector power/bias pin to the ECM connector pin. Repair any open or high-resistance sections.
- Check for shorts: measure resistance from the bias/power circuit to ground and to battery positive. Repair insulation or shorts if found.
- If wiring and power are good, disconnect the sensor and measure sensor resistance/output per service manual or substitute a known-good sensor to verify operation.
- If a wiring harness repair was performed, ensure secure, sealed connections and protect the harness from heat/abrasion; clear codes and perform road test.
- If the supply remains low with verified wiring and a known-good sensor, suspect ECM internal fault and consider ECM bench testing or replacement as per manufacturer guidance.
- Safety note: avoid shorting harness pins; disconnect battery if performing major repairs to wiring or ECM.
Likely causes
- Corroded/damaged sensor connector or wiring insulation
- Broken wire or pinched harness near engine or CV boot area
- Failed knock sensor (open/low output or internal short)
- Faulty ground at engine/ECM causing low circuit voltage
- Blown/loose fuse for ECM power/reference circuit
Fault status
Status
Knock Sensor Power Source Circuit Low Voltage — ECM detected low voltage on the knock sensor bias/power circuit. Knock sensing may be disabled and engine timing may be retarded until the issue is corrected.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
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Code
P1324
VOLKSWAGEN
P — Powertrain
Knock Sensor 4 Circuit High Input
Views:
UK: 16
EN: 29
RU: 20
AI status
Completed
Completed
100%
Causes
- Open or short in knock sensor power/bias wiring
- Poor or corroded connector contact at sensor or ECM
- Faulty knock sensor
- Faulty ECM or degraded internal reference/bias supply
- Blown fuse or fusible link on sensor/ECM power feed
- Low battery voltage or poor battery/charging system
Symptoms
- Check Engine Light (MIL) illuminated
- Reduced engine power or hesitation due to timing retard
- Engine knock/pinging under load (if knock sensing disabled)
- Poor fuel economy
- Occasional misfire or rough idle (depending on related faults)
What to check
- Read freeze frame and live data for knock sensor status and related codes
- Visually inspect knock sensor connector and wiring for corrosion, damage or oil contamination
- Check battery voltage and charging system condition
- Verify relevant fuses and fusible links are intact
- Backprobing: measure reference/bias voltage at the sensor connector with ignition ON
- Measure continuity between sensor connector and ECM connector, and check for short to ground/12V
Signal parameters
- Reference/bias voltage at sensor connector with key ON: approximately 4.5–5.0 V (confirm with factory service data)
- Sensor output: small AC voltage (millivolt range) when engine is running and knock is present; should not be stuck at 0 V
- Connector pin continuity: near 0 ohms between sensor pin and ECM pin (manufacturer spec)
- Check for no short to ground or 12 V on the power/bias line
Diagnostic algorithm
- Retrieve codes and freeze frame; note conditions when fault set (engine load, RPM, temp).
- Clear code and attempt to re-create while monitoring live data for knock sensor voltage and reference/bias. If code returns, proceed.
- Visually inspect sensor, connector, and wiring for damage, corrosion, oil, or contaminants. Repair as needed.
- With ignition ON (engine off), backprobe the sensor connector and measure the reference/bias voltage. If low or absent, check related fuses and power feeds to the ECM.
- Check continuity from the sensor connector power/bias pin to the ECM connector pin. Repair any open or high-resistance sections.
- Check for shorts: measure resistance from the bias/power circuit to ground and to battery positive. Repair insulation or shorts if found.
- If wiring and power are good, disconnect the sensor and measure sensor resistance/output per service manual or substitute a known-good sensor to verify operation.
- If a wiring harness repair was performed, ensure secure, sealed connections and protect the harness from heat/abrasion; clear codes and perform road test.
- If the supply remains low with verified wiring and a known-good sensor, suspect ECM internal fault and consider ECM bench testing or replacement as per manufacturer guidance.
- Safety note: avoid shorting harness pins; disconnect battery if performing major repairs to wiring or ECM.
Likely causes
- Corroded/damaged sensor connector or wiring insulation
- Broken wire or pinched harness near engine or CV boot area
- Failed knock sensor (open/low output or internal short)
- Faulty ground at engine/ECM causing low circuit voltage
- Blown/loose fuse for ECM power/reference circuit
Fault status
Status
Knock Sensor Power Source Circuit Low Voltage — ECM detected low voltage on the knock sensor bias/power circuit. Knock sensing may be disabled and engine timing may be retarded until the issue is corrected.
Repair difficulty: Medium
Diagnostic time: 1-3 hours
Similar codes
Your experience will help others
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Was this AI description helpful?
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