Code
P1300
ACURA
P — Powertrain
Random Misfire
Views:
UK: 27
EN: 69
RU: 38
AI status
Completed
Completed
100%
Causes
- Worn or fouled spark plugs
- Failing ignition coils or coil-on-plug components
- Fuel injector failure, clogging, or poor spray pattern
- Low fuel pressure (weak pump, clogged filter, regulator fault)
- Vacuum leaks or intake manifold gasket leaks
- Faulty mass air flow (MAF) or MAP sensor
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or intermittent surging
- Reduced engine power or hesitation under load
- Poor fuel economy and increased emissions
- Occasional engine stumble or bucking
- Misfire detected in freeze frame or misfire counters
What to check
- Read stored/active DTCs and freeze-frame data; note rpm, load, temperature when misfire occurred
- Monitor live data: misfire counts per cylinder, long/short term fuel trim, fuel trims, MAF/MAP, O2 sensor voltages
- Scan for related codes (P0300–P0308 and sensor/fuel trim codes)
- Inspect spark plugs for wear, fouling, or oil contamination; check gap
- Test ignition coils (primary/secondary resistance, swap coil to see if misfire follows)
- Inspect wiring and connectors for coils and injectors; check grounds
Signal parameters
- Cylinder misfire counts (per-cylinder misfire counter)
- Crankshaft position sensor signal (timing/consistency)
- Camshaft position sensor signal
- Fuel rail pressure (psi or kPa)
- Injector pulse width (ms) and duty cycle
- Ignition coil primary and secondary resistance (ohms)
Diagnostic algorithm
- Retrieve freeze-frame and live data; confirm P1300 and check related P03xx codes to see if specific cylinders are identified.
- Clear codes, then perform a controlled road or loaded test while monitoring misfire counters and fuel/sensor data to reproduce the misfire.
- Inspect spark plugs and ignition coils on cylinders showing highest misfire counts; replace any plug or coil showing wear or failure.
- Swap ignition coil or injector between affected and known-good cylinder(s). If misfire follows the component, replace it.
- Measure fuel rail pressure and inspect fuel supply (pump, filter, regulator). Repair if pressure is out of specification.
- Perform injector tests (balance, current draw, spray pattern) and clean or replace clogged injectors.
- Check for intake vacuum leaks (smoke test), leaking intake manifold gaskets, or disconnected hoses; repair as needed.
- Test MAF/MAP and related sensors; clean MAF if contaminated, replace if out of spec. Verify fuel trims return to normal.
- If electrical faults suspected, inspect wiring harness, connectors, and grounds for intermittent faults; repair splices or corroded connectors.
- If misfire persists after ignition/fuel/sensor checks, perform compression and/or leak-down test to evaluate mechanical condition.
- After repair, clear codes and perform verification drive to ensure misfire no longer occurs and that fuel trims and O2 sensors behave normally.
Likely causes
- Worn or fouled spark plugs or failing coils
- Intermittent injector operation or clogged injector(s)
- Vacuum leak or intake leak causing lean condition
- Low fuel pressure or weak fuel pump
- Faulty MAF or MAP sensor skewing fuel delivery
- Intermittent wiring/connectors at coils/injectors or grounds
Fault status
Status
Random/multiple cylinder misfire detected — intermittent combustion misfire events recorded across one or more cylinders.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1300
ALFA ROMEO
P — Powertrain
Pre/post-heating relay fault | Tone wheel signal fault
Views:
UK: 5
EN: 7
RU: 8
AI status
Completed
Completed
100%
Causes
- Worn or fouled spark plugs
- Failing ignition coils or coil-on-plug components
- Fuel injector failure, clogging, or poor spray pattern
- Low fuel pressure (weak pump, clogged filter, regulator fault)
- Vacuum leaks or intake manifold gasket leaks
- Faulty mass air flow (MAF) or MAP sensor
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or intermittent surging
- Reduced engine power or hesitation under load
- Poor fuel economy and increased emissions
- Occasional engine stumble or bucking
- Misfire detected in freeze frame or misfire counters
What to check
- Read stored/active DTCs and freeze-frame data; note rpm, load, temperature when misfire occurred
- Monitor live data: misfire counts per cylinder, long/short term fuel trim, fuel trims, MAF/MAP, O2 sensor voltages
- Scan for related codes (P0300–P0308 and sensor/fuel trim codes)
- Inspect spark plugs for wear, fouling, or oil contamination; check gap
- Test ignition coils (primary/secondary resistance, swap coil to see if misfire follows)
- Inspect wiring and connectors for coils and injectors; check grounds
Signal parameters
- Cylinder misfire counts (per-cylinder misfire counter)
- Crankshaft position sensor signal (timing/consistency)
- Camshaft position sensor signal
- Fuel rail pressure (psi or kPa)
- Injector pulse width (ms) and duty cycle
- Ignition coil primary and secondary resistance (ohms)
Diagnostic algorithm
- Retrieve freeze-frame and live data; confirm P1300 and check related P03xx codes to see if specific cylinders are identified.
- Clear codes, then perform a controlled road or loaded test while monitoring misfire counters and fuel/sensor data to reproduce the misfire.
- Inspect spark plugs and ignition coils on cylinders showing highest misfire counts; replace any plug or coil showing wear or failure.
- Swap ignition coil or injector between affected and known-good cylinder(s). If misfire follows the component, replace it.
- Measure fuel rail pressure and inspect fuel supply (pump, filter, regulator). Repair if pressure is out of specification.
- Perform injector tests (balance, current draw, spray pattern) and clean or replace clogged injectors.
- Check for intake vacuum leaks (smoke test), leaking intake manifold gaskets, or disconnected hoses; repair as needed.
- Test MAF/MAP and related sensors; clean MAF if contaminated, replace if out of spec. Verify fuel trims return to normal.
- If electrical faults suspected, inspect wiring harness, connectors, and grounds for intermittent faults; repair splices or corroded connectors.
- If misfire persists after ignition/fuel/sensor checks, perform compression and/or leak-down test to evaluate mechanical condition.
- After repair, clear codes and perform verification drive to ensure misfire no longer occurs and that fuel trims and O2 sensors behave normally.
Likely causes
- Worn or fouled spark plugs or failing coils
- Intermittent injector operation or clogged injector(s)
- Vacuum leak or intake leak causing lean condition
- Low fuel pressure or weak fuel pump
- Faulty MAF or MAP sensor skewing fuel delivery
- Intermittent wiring/connectors at coils/injectors or grounds
Fault status
Status
Random/multiple cylinder misfire detected — intermittent combustion misfire events recorded across one or more cylinders.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1300
BUICK
P — Powertrain
Ignitor Circuit
Views:
UK: 26
EN: 42
RU: 40
AI status
Completed
Completed
100%
Causes
- Worn or fouled spark plugs
- Failing ignition coils or coil-on-plug components
- Fuel injector failure, clogging, or poor spray pattern
- Low fuel pressure (weak pump, clogged filter, regulator fault)
- Vacuum leaks or intake manifold gasket leaks
- Faulty mass air flow (MAF) or MAP sensor
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or intermittent surging
- Reduced engine power or hesitation under load
- Poor fuel economy and increased emissions
- Occasional engine stumble or bucking
- Misfire detected in freeze frame or misfire counters
What to check
- Read stored/active DTCs and freeze-frame data; note rpm, load, temperature when misfire occurred
- Monitor live data: misfire counts per cylinder, long/short term fuel trim, fuel trims, MAF/MAP, O2 sensor voltages
- Scan for related codes (P0300–P0308 and sensor/fuel trim codes)
- Inspect spark plugs for wear, fouling, or oil contamination; check gap
- Test ignition coils (primary/secondary resistance, swap coil to see if misfire follows)
- Inspect wiring and connectors for coils and injectors; check grounds
Signal parameters
- Cylinder misfire counts (per-cylinder misfire counter)
- Crankshaft position sensor signal (timing/consistency)
- Camshaft position sensor signal
- Fuel rail pressure (psi or kPa)
- Injector pulse width (ms) and duty cycle
- Ignition coil primary and secondary resistance (ohms)
Diagnostic algorithm
- Retrieve freeze-frame and live data; confirm P1300 and check related P03xx codes to see if specific cylinders are identified.
- Clear codes, then perform a controlled road or loaded test while monitoring misfire counters and fuel/sensor data to reproduce the misfire.
- Inspect spark plugs and ignition coils on cylinders showing highest misfire counts; replace any plug or coil showing wear or failure.
- Swap ignition coil or injector between affected and known-good cylinder(s). If misfire follows the component, replace it.
- Measure fuel rail pressure and inspect fuel supply (pump, filter, regulator). Repair if pressure is out of specification.
- Perform injector tests (balance, current draw, spray pattern) and clean or replace clogged injectors.
- Check for intake vacuum leaks (smoke test), leaking intake manifold gaskets, or disconnected hoses; repair as needed.
- Test MAF/MAP and related sensors; clean MAF if contaminated, replace if out of spec. Verify fuel trims return to normal.
- If electrical faults suspected, inspect wiring harness, connectors, and grounds for intermittent faults; repair splices or corroded connectors.
- If misfire persists after ignition/fuel/sensor checks, perform compression and/or leak-down test to evaluate mechanical condition.
- After repair, clear codes and perform verification drive to ensure misfire no longer occurs and that fuel trims and O2 sensors behave normally.
Likely causes
- Worn or fouled spark plugs or failing coils
- Intermittent injector operation or clogged injector(s)
- Vacuum leak or intake leak causing lean condition
- Low fuel pressure or weak fuel pump
- Faulty MAF or MAP sensor skewing fuel delivery
- Intermittent wiring/connectors at coils/injectors or grounds
Fault status
Status
Random/multiple cylinder misfire detected — intermittent combustion misfire events recorded across one or more cylinders.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1300
CADILLAC
P — Powertrain
Ignitor Circuit
Views:
UK: 25
EN: 51
RU: 39
AI status
Completed
Completed
100%
Causes
- Worn or fouled spark plugs
- Failing ignition coils or coil-on-plug components
- Fuel injector failure, clogging, or poor spray pattern
- Low fuel pressure (weak pump, clogged filter, regulator fault)
- Vacuum leaks or intake manifold gasket leaks
- Faulty mass air flow (MAF) or MAP sensor
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or intermittent surging
- Reduced engine power or hesitation under load
- Poor fuel economy and increased emissions
- Occasional engine stumble or bucking
- Misfire detected in freeze frame or misfire counters
What to check
- Read stored/active DTCs and freeze-frame data; note rpm, load, temperature when misfire occurred
- Monitor live data: misfire counts per cylinder, long/short term fuel trim, fuel trims, MAF/MAP, O2 sensor voltages
- Scan for related codes (P0300–P0308 and sensor/fuel trim codes)
- Inspect spark plugs for wear, fouling, or oil contamination; check gap
- Test ignition coils (primary/secondary resistance, swap coil to see if misfire follows)
- Inspect wiring and connectors for coils and injectors; check grounds
Signal parameters
- Cylinder misfire counts (per-cylinder misfire counter)
- Crankshaft position sensor signal (timing/consistency)
- Camshaft position sensor signal
- Fuel rail pressure (psi or kPa)
- Injector pulse width (ms) and duty cycle
- Ignition coil primary and secondary resistance (ohms)
Diagnostic algorithm
- Retrieve freeze-frame and live data; confirm P1300 and check related P03xx codes to see if specific cylinders are identified.
- Clear codes, then perform a controlled road or loaded test while monitoring misfire counters and fuel/sensor data to reproduce the misfire.
- Inspect spark plugs and ignition coils on cylinders showing highest misfire counts; replace any plug or coil showing wear or failure.
- Swap ignition coil or injector between affected and known-good cylinder(s). If misfire follows the component, replace it.
- Measure fuel rail pressure and inspect fuel supply (pump, filter, regulator). Repair if pressure is out of specification.
- Perform injector tests (balance, current draw, spray pattern) and clean or replace clogged injectors.
- Check for intake vacuum leaks (smoke test), leaking intake manifold gaskets, or disconnected hoses; repair as needed.
- Test MAF/MAP and related sensors; clean MAF if contaminated, replace if out of spec. Verify fuel trims return to normal.
- If electrical faults suspected, inspect wiring harness, connectors, and grounds for intermittent faults; repair splices or corroded connectors.
- If misfire persists after ignition/fuel/sensor checks, perform compression and/or leak-down test to evaluate mechanical condition.
- After repair, clear codes and perform verification drive to ensure misfire no longer occurs and that fuel trims and O2 sensors behave normally.
Likely causes
- Worn or fouled spark plugs or failing coils
- Intermittent injector operation or clogged injector(s)
- Vacuum leak or intake leak causing lean condition
- Low fuel pressure or weak fuel pump
- Faulty MAF or MAP sensor skewing fuel delivery
- Intermittent wiring/connectors at coils/injectors or grounds
Fault status
Status
Random/multiple cylinder misfire detected — intermittent combustion misfire events recorded across one or more cylinders.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1300
CHEVROLET
P — Powertrain
Ignitor Circuit
Views:
UK: 25
EN: 43
RU: 37
AI status
Completed
Completed
100%
Causes
- Worn or fouled spark plugs
- Failing ignition coils or coil-on-plug components
- Fuel injector failure, clogging, or poor spray pattern
- Low fuel pressure (weak pump, clogged filter, regulator fault)
- Vacuum leaks or intake manifold gasket leaks
- Faulty mass air flow (MAF) or MAP sensor
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or intermittent surging
- Reduced engine power or hesitation under load
- Poor fuel economy and increased emissions
- Occasional engine stumble or bucking
- Misfire detected in freeze frame or misfire counters
What to check
- Read stored/active DTCs and freeze-frame data; note rpm, load, temperature when misfire occurred
- Monitor live data: misfire counts per cylinder, long/short term fuel trim, fuel trims, MAF/MAP, O2 sensor voltages
- Scan for related codes (P0300–P0308 and sensor/fuel trim codes)
- Inspect spark plugs for wear, fouling, or oil contamination; check gap
- Test ignition coils (primary/secondary resistance, swap coil to see if misfire follows)
- Inspect wiring and connectors for coils and injectors; check grounds
Signal parameters
- Cylinder misfire counts (per-cylinder misfire counter)
- Crankshaft position sensor signal (timing/consistency)
- Camshaft position sensor signal
- Fuel rail pressure (psi or kPa)
- Injector pulse width (ms) and duty cycle
- Ignition coil primary and secondary resistance (ohms)
Diagnostic algorithm
- Retrieve freeze-frame and live data; confirm P1300 and check related P03xx codes to see if specific cylinders are identified.
- Clear codes, then perform a controlled road or loaded test while monitoring misfire counters and fuel/sensor data to reproduce the misfire.
- Inspect spark plugs and ignition coils on cylinders showing highest misfire counts; replace any plug or coil showing wear or failure.
- Swap ignition coil or injector between affected and known-good cylinder(s). If misfire follows the component, replace it.
- Measure fuel rail pressure and inspect fuel supply (pump, filter, regulator). Repair if pressure is out of specification.
- Perform injector tests (balance, current draw, spray pattern) and clean or replace clogged injectors.
- Check for intake vacuum leaks (smoke test), leaking intake manifold gaskets, or disconnected hoses; repair as needed.
- Test MAF/MAP and related sensors; clean MAF if contaminated, replace if out of spec. Verify fuel trims return to normal.
- If electrical faults suspected, inspect wiring harness, connectors, and grounds for intermittent faults; repair splices or corroded connectors.
- If misfire persists after ignition/fuel/sensor checks, perform compression and/or leak-down test to evaluate mechanical condition.
- After repair, clear codes and perform verification drive to ensure misfire no longer occurs and that fuel trims and O2 sensors behave normally.
Likely causes
- Worn or fouled spark plugs or failing coils
- Intermittent injector operation or clogged injector(s)
- Vacuum leak or intake leak causing lean condition
- Low fuel pressure or weak fuel pump
- Faulty MAF or MAP sensor skewing fuel delivery
- Intermittent wiring/connectors at coils/injectors or grounds
Fault status
Status
Random/multiple cylinder misfire detected — intermittent combustion misfire events recorded across one or more cylinders.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1300
CHRYSLER
P — Powertrain
Ignitor Circuit
Views:
UK: 28
EN: 45
RU: 37
AI status
Completed
Completed
100%
Causes
- Worn or fouled spark plugs
- Failing ignition coils or coil-on-plug components
- Fuel injector failure, clogging, or poor spray pattern
- Low fuel pressure (weak pump, clogged filter, regulator fault)
- Vacuum leaks or intake manifold gasket leaks
- Faulty mass air flow (MAF) or MAP sensor
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or intermittent surging
- Reduced engine power or hesitation under load
- Poor fuel economy and increased emissions
- Occasional engine stumble or bucking
- Misfire detected in freeze frame or misfire counters
What to check
- Read stored/active DTCs and freeze-frame data; note rpm, load, temperature when misfire occurred
- Monitor live data: misfire counts per cylinder, long/short term fuel trim, fuel trims, MAF/MAP, O2 sensor voltages
- Scan for related codes (P0300–P0308 and sensor/fuel trim codes)
- Inspect spark plugs for wear, fouling, or oil contamination; check gap
- Test ignition coils (primary/secondary resistance, swap coil to see if misfire follows)
- Inspect wiring and connectors for coils and injectors; check grounds
Signal parameters
- Cylinder misfire counts (per-cylinder misfire counter)
- Crankshaft position sensor signal (timing/consistency)
- Camshaft position sensor signal
- Fuel rail pressure (psi or kPa)
- Injector pulse width (ms) and duty cycle
- Ignition coil primary and secondary resistance (ohms)
Diagnostic algorithm
- Retrieve freeze-frame and live data; confirm P1300 and check related P03xx codes to see if specific cylinders are identified.
- Clear codes, then perform a controlled road or loaded test while monitoring misfire counters and fuel/sensor data to reproduce the misfire.
- Inspect spark plugs and ignition coils on cylinders showing highest misfire counts; replace any plug or coil showing wear or failure.
- Swap ignition coil or injector between affected and known-good cylinder(s). If misfire follows the component, replace it.
- Measure fuel rail pressure and inspect fuel supply (pump, filter, regulator). Repair if pressure is out of specification.
- Perform injector tests (balance, current draw, spray pattern) and clean or replace clogged injectors.
- Check for intake vacuum leaks (smoke test), leaking intake manifold gaskets, or disconnected hoses; repair as needed.
- Test MAF/MAP and related sensors; clean MAF if contaminated, replace if out of spec. Verify fuel trims return to normal.
- If electrical faults suspected, inspect wiring harness, connectors, and grounds for intermittent faults; repair splices or corroded connectors.
- If misfire persists after ignition/fuel/sensor checks, perform compression and/or leak-down test to evaluate mechanical condition.
- After repair, clear codes and perform verification drive to ensure misfire no longer occurs and that fuel trims and O2 sensors behave normally.
Likely causes
- Worn or fouled spark plugs or failing coils
- Intermittent injector operation or clogged injector(s)
- Vacuum leak or intake leak causing lean condition
- Low fuel pressure or weak fuel pump
- Faulty MAF or MAP sensor skewing fuel delivery
- Intermittent wiring/connectors at coils/injectors or grounds
Fault status
Status
Random/multiple cylinder misfire detected — intermittent combustion misfire events recorded across one or more cylinders.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1300
DAEWOO
P — Powertrain
TDC SNSR MAL
Views:
UK: 4
EN: 5
RU: 7
AI status
Completed
Completed
100%
Causes
- Worn or fouled spark plugs
- Failing ignition coils or coil-on-plug components
- Fuel injector failure, clogging, or poor spray pattern
- Low fuel pressure (weak pump, clogged filter, regulator fault)
- Vacuum leaks or intake manifold gasket leaks
- Faulty mass air flow (MAF) or MAP sensor
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or intermittent surging
- Reduced engine power or hesitation under load
- Poor fuel economy and increased emissions
- Occasional engine stumble or bucking
- Misfire detected in freeze frame or misfire counters
What to check
- Read stored/active DTCs and freeze-frame data; note rpm, load, temperature when misfire occurred
- Monitor live data: misfire counts per cylinder, long/short term fuel trim, fuel trims, MAF/MAP, O2 sensor voltages
- Scan for related codes (P0300–P0308 and sensor/fuel trim codes)
- Inspect spark plugs for wear, fouling, or oil contamination; check gap
- Test ignition coils (primary/secondary resistance, swap coil to see if misfire follows)
- Inspect wiring and connectors for coils and injectors; check grounds
Signal parameters
- Cylinder misfire counts (per-cylinder misfire counter)
- Crankshaft position sensor signal (timing/consistency)
- Camshaft position sensor signal
- Fuel rail pressure (psi or kPa)
- Injector pulse width (ms) and duty cycle
- Ignition coil primary and secondary resistance (ohms)
Diagnostic algorithm
- Retrieve freeze-frame and live data; confirm P1300 and check related P03xx codes to see if specific cylinders are identified.
- Clear codes, then perform a controlled road or loaded test while monitoring misfire counters and fuel/sensor data to reproduce the misfire.
- Inspect spark plugs and ignition coils on cylinders showing highest misfire counts; replace any plug or coil showing wear or failure.
- Swap ignition coil or injector between affected and known-good cylinder(s). If misfire follows the component, replace it.
- Measure fuel rail pressure and inspect fuel supply (pump, filter, regulator). Repair if pressure is out of specification.
- Perform injector tests (balance, current draw, spray pattern) and clean or replace clogged injectors.
- Check for intake vacuum leaks (smoke test), leaking intake manifold gaskets, or disconnected hoses; repair as needed.
- Test MAF/MAP and related sensors; clean MAF if contaminated, replace if out of spec. Verify fuel trims return to normal.
- If electrical faults suspected, inspect wiring harness, connectors, and grounds for intermittent faults; repair splices or corroded connectors.
- If misfire persists after ignition/fuel/sensor checks, perform compression and/or leak-down test to evaluate mechanical condition.
- After repair, clear codes and perform verification drive to ensure misfire no longer occurs and that fuel trims and O2 sensors behave normally.
Likely causes
- Worn or fouled spark plugs or failing coils
- Intermittent injector operation or clogged injector(s)
- Vacuum leak or intake leak causing lean condition
- Low fuel pressure or weak fuel pump
- Faulty MAF or MAP sensor skewing fuel delivery
- Intermittent wiring/connectors at coils/injectors or grounds
Fault status
Status
Random/multiple cylinder misfire detected — intermittent combustion misfire events recorded across one or more cylinders.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1300
FIAT
P — Powertrain
Pre/post-heating relay fault | Tone wheel signal fault
Views:
UK: 5
EN: 6
RU: 8
AI status
Completed
Completed
100%
Causes
- Worn or fouled spark plugs
- Failing ignition coils or coil-on-plug components
- Fuel injector failure, clogging, or poor spray pattern
- Low fuel pressure (weak pump, clogged filter, regulator fault)
- Vacuum leaks or intake manifold gasket leaks
- Faulty mass air flow (MAF) or MAP sensor
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or intermittent surging
- Reduced engine power or hesitation under load
- Poor fuel economy and increased emissions
- Occasional engine stumble or bucking
- Misfire detected in freeze frame or misfire counters
What to check
- Read stored/active DTCs and freeze-frame data; note rpm, load, temperature when misfire occurred
- Monitor live data: misfire counts per cylinder, long/short term fuel trim, fuel trims, MAF/MAP, O2 sensor voltages
- Scan for related codes (P0300–P0308 and sensor/fuel trim codes)
- Inspect spark plugs for wear, fouling, or oil contamination; check gap
- Test ignition coils (primary/secondary resistance, swap coil to see if misfire follows)
- Inspect wiring and connectors for coils and injectors; check grounds
Signal parameters
- Cylinder misfire counts (per-cylinder misfire counter)
- Crankshaft position sensor signal (timing/consistency)
- Camshaft position sensor signal
- Fuel rail pressure (psi or kPa)
- Injector pulse width (ms) and duty cycle
- Ignition coil primary and secondary resistance (ohms)
Diagnostic algorithm
- Retrieve freeze-frame and live data; confirm P1300 and check related P03xx codes to see if specific cylinders are identified.
- Clear codes, then perform a controlled road or loaded test while monitoring misfire counters and fuel/sensor data to reproduce the misfire.
- Inspect spark plugs and ignition coils on cylinders showing highest misfire counts; replace any plug or coil showing wear or failure.
- Swap ignition coil or injector between affected and known-good cylinder(s). If misfire follows the component, replace it.
- Measure fuel rail pressure and inspect fuel supply (pump, filter, regulator). Repair if pressure is out of specification.
- Perform injector tests (balance, current draw, spray pattern) and clean or replace clogged injectors.
- Check for intake vacuum leaks (smoke test), leaking intake manifold gaskets, or disconnected hoses; repair as needed.
- Test MAF/MAP and related sensors; clean MAF if contaminated, replace if out of spec. Verify fuel trims return to normal.
- If electrical faults suspected, inspect wiring harness, connectors, and grounds for intermittent faults; repair splices or corroded connectors.
- If misfire persists after ignition/fuel/sensor checks, perform compression and/or leak-down test to evaluate mechanical condition.
- After repair, clear codes and perform verification drive to ensure misfire no longer occurs and that fuel trims and O2 sensors behave normally.
Likely causes
- Worn or fouled spark plugs or failing coils
- Intermittent injector operation or clogged injector(s)
- Vacuum leak or intake leak causing lean condition
- Low fuel pressure or weak fuel pump
- Faulty MAF or MAP sensor skewing fuel delivery
- Intermittent wiring/connectors at coils/injectors or grounds
Fault status
Status
Random/multiple cylinder misfire detected — intermittent combustion misfire events recorded across one or more cylinders.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
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Code
P1300
FORD
P — Powertrain
Boost Calibration Fault
Views:
UK: 26
EN: 42
RU: 39
AI status
Completed
Completed
100%
Causes
- Worn or fouled spark plugs
- Failing ignition coils or coil-on-plug components
- Fuel injector failure, clogging, or poor spray pattern
- Low fuel pressure (weak pump, clogged filter, regulator fault)
- Vacuum leaks or intake manifold gasket leaks
- Faulty mass air flow (MAF) or MAP sensor
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or intermittent surging
- Reduced engine power or hesitation under load
- Poor fuel economy and increased emissions
- Occasional engine stumble or bucking
- Misfire detected in freeze frame or misfire counters
What to check
- Read stored/active DTCs and freeze-frame data; note rpm, load, temperature when misfire occurred
- Monitor live data: misfire counts per cylinder, long/short term fuel trim, fuel trims, MAF/MAP, O2 sensor voltages
- Scan for related codes (P0300–P0308 and sensor/fuel trim codes)
- Inspect spark plugs for wear, fouling, or oil contamination; check gap
- Test ignition coils (primary/secondary resistance, swap coil to see if misfire follows)
- Inspect wiring and connectors for coils and injectors; check grounds
Signal parameters
- Cylinder misfire counts (per-cylinder misfire counter)
- Crankshaft position sensor signal (timing/consistency)
- Camshaft position sensor signal
- Fuel rail pressure (psi or kPa)
- Injector pulse width (ms) and duty cycle
- Ignition coil primary and secondary resistance (ohms)
Diagnostic algorithm
- Retrieve freeze-frame and live data; confirm P1300 and check related P03xx codes to see if specific cylinders are identified.
- Clear codes, then perform a controlled road or loaded test while monitoring misfire counters and fuel/sensor data to reproduce the misfire.
- Inspect spark plugs and ignition coils on cylinders showing highest misfire counts; replace any plug or coil showing wear or failure.
- Swap ignition coil or injector between affected and known-good cylinder(s). If misfire follows the component, replace it.
- Measure fuel rail pressure and inspect fuel supply (pump, filter, regulator). Repair if pressure is out of specification.
- Perform injector tests (balance, current draw, spray pattern) and clean or replace clogged injectors.
- Check for intake vacuum leaks (smoke test), leaking intake manifold gaskets, or disconnected hoses; repair as needed.
- Test MAF/MAP and related sensors; clean MAF if contaminated, replace if out of spec. Verify fuel trims return to normal.
- If electrical faults suspected, inspect wiring harness, connectors, and grounds for intermittent faults; repair splices or corroded connectors.
- If misfire persists after ignition/fuel/sensor checks, perform compression and/or leak-down test to evaluate mechanical condition.
- After repair, clear codes and perform verification drive to ensure misfire no longer occurs and that fuel trims and O2 sensors behave normally.
Likely causes
- Worn or fouled spark plugs or failing coils
- Intermittent injector operation or clogged injector(s)
- Vacuum leak or intake leak causing lean condition
- Low fuel pressure or weak fuel pump
- Faulty MAF or MAP sensor skewing fuel delivery
- Intermittent wiring/connectors at coils/injectors or grounds
Fault status
Status
Random/multiple cylinder misfire detected — intermittent combustion misfire events recorded across one or more cylinders.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1300
GEO
P — Powertrain
Ignition Coil 1 Primary Feedback Circuit
Views:
UK: 29
EN: 41
RU: 37
AI status
Completed
Completed
100%
Causes
- Worn or fouled spark plugs
- Failing ignition coils or coil-on-plug components
- Fuel injector failure, clogging, or poor spray pattern
- Low fuel pressure (weak pump, clogged filter, regulator fault)
- Vacuum leaks or intake manifold gasket leaks
- Faulty mass air flow (MAF) or MAP sensor
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or intermittent surging
- Reduced engine power or hesitation under load
- Poor fuel economy and increased emissions
- Occasional engine stumble or bucking
- Misfire detected in freeze frame or misfire counters
What to check
- Read stored/active DTCs and freeze-frame data; note rpm, load, temperature when misfire occurred
- Monitor live data: misfire counts per cylinder, long/short term fuel trim, fuel trims, MAF/MAP, O2 sensor voltages
- Scan for related codes (P0300–P0308 and sensor/fuel trim codes)
- Inspect spark plugs for wear, fouling, or oil contamination; check gap
- Test ignition coils (primary/secondary resistance, swap coil to see if misfire follows)
- Inspect wiring and connectors for coils and injectors; check grounds
Signal parameters
- Cylinder misfire counts (per-cylinder misfire counter)
- Crankshaft position sensor signal (timing/consistency)
- Camshaft position sensor signal
- Fuel rail pressure (psi or kPa)
- Injector pulse width (ms) and duty cycle
- Ignition coil primary and secondary resistance (ohms)
Diagnostic algorithm
- Retrieve freeze-frame and live data; confirm P1300 and check related P03xx codes to see if specific cylinders are identified.
- Clear codes, then perform a controlled road or loaded test while monitoring misfire counters and fuel/sensor data to reproduce the misfire.
- Inspect spark plugs and ignition coils on cylinders showing highest misfire counts; replace any plug or coil showing wear or failure.
- Swap ignition coil or injector between affected and known-good cylinder(s). If misfire follows the component, replace it.
- Measure fuel rail pressure and inspect fuel supply (pump, filter, regulator). Repair if pressure is out of specification.
- Perform injector tests (balance, current draw, spray pattern) and clean or replace clogged injectors.
- Check for intake vacuum leaks (smoke test), leaking intake manifold gaskets, or disconnected hoses; repair as needed.
- Test MAF/MAP and related sensors; clean MAF if contaminated, replace if out of spec. Verify fuel trims return to normal.
- If electrical faults suspected, inspect wiring harness, connectors, and grounds for intermittent faults; repair splices or corroded connectors.
- If misfire persists after ignition/fuel/sensor checks, perform compression and/or leak-down test to evaluate mechanical condition.
- After repair, clear codes and perform verification drive to ensure misfire no longer occurs and that fuel trims and O2 sensors behave normally.
Likely causes
- Worn or fouled spark plugs or failing coils
- Intermittent injector operation or clogged injector(s)
- Vacuum leak or intake leak causing lean condition
- Low fuel pressure or weak fuel pump
- Faulty MAF or MAP sensor skewing fuel delivery
- Intermittent wiring/connectors at coils/injectors or grounds
Fault status
Status
Random/multiple cylinder misfire detected — intermittent combustion misfire events recorded across one or more cylinders.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1300
GM
P — Powertrain
Ignitor Circuit
Views:
UK: 28
EN: 45
RU: 37
AI status
Completed
Completed
100%
Causes
- Worn or fouled spark plugs
- Failing ignition coils or coil-on-plug components
- Fuel injector failure, clogging, or poor spray pattern
- Low fuel pressure (weak pump, clogged filter, regulator fault)
- Vacuum leaks or intake manifold gasket leaks
- Faulty mass air flow (MAF) or MAP sensor
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or intermittent surging
- Reduced engine power or hesitation under load
- Poor fuel economy and increased emissions
- Occasional engine stumble or bucking
- Misfire detected in freeze frame or misfire counters
What to check
- Read stored/active DTCs and freeze-frame data; note rpm, load, temperature when misfire occurred
- Monitor live data: misfire counts per cylinder, long/short term fuel trim, fuel trims, MAF/MAP, O2 sensor voltages
- Scan for related codes (P0300–P0308 and sensor/fuel trim codes)
- Inspect spark plugs for wear, fouling, or oil contamination; check gap
- Test ignition coils (primary/secondary resistance, swap coil to see if misfire follows)
- Inspect wiring and connectors for coils and injectors; check grounds
Signal parameters
- Cylinder misfire counts (per-cylinder misfire counter)
- Crankshaft position sensor signal (timing/consistency)
- Camshaft position sensor signal
- Fuel rail pressure (psi or kPa)
- Injector pulse width (ms) and duty cycle
- Ignition coil primary and secondary resistance (ohms)
Diagnostic algorithm
- Retrieve freeze-frame and live data; confirm P1300 and check related P03xx codes to see if specific cylinders are identified.
- Clear codes, then perform a controlled road or loaded test while monitoring misfire counters and fuel/sensor data to reproduce the misfire.
- Inspect spark plugs and ignition coils on cylinders showing highest misfire counts; replace any plug or coil showing wear or failure.
- Swap ignition coil or injector between affected and known-good cylinder(s). If misfire follows the component, replace it.
- Measure fuel rail pressure and inspect fuel supply (pump, filter, regulator). Repair if pressure is out of specification.
- Perform injector tests (balance, current draw, spray pattern) and clean or replace clogged injectors.
- Check for intake vacuum leaks (smoke test), leaking intake manifold gaskets, or disconnected hoses; repair as needed.
- Test MAF/MAP and related sensors; clean MAF if contaminated, replace if out of spec. Verify fuel trims return to normal.
- If electrical faults suspected, inspect wiring harness, connectors, and grounds for intermittent faults; repair splices or corroded connectors.
- If misfire persists after ignition/fuel/sensor checks, perform compression and/or leak-down test to evaluate mechanical condition.
- After repair, clear codes and perform verification drive to ensure misfire no longer occurs and that fuel trims and O2 sensors behave normally.
Likely causes
- Worn or fouled spark plugs or failing coils
- Intermittent injector operation or clogged injector(s)
- Vacuum leak or intake leak causing lean condition
- Low fuel pressure or weak fuel pump
- Faulty MAF or MAP sensor skewing fuel delivery
- Intermittent wiring/connectors at coils/injectors or grounds
Fault status
Status
Random/multiple cylinder misfire detected — intermittent combustion misfire events recorded across one or more cylinders.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1300
GMC
P — Powertrain
Ignitor Circuit
Views:
UK: 28
EN: 57
RU: 39
AI status
Completed
Completed
100%
Causes
- Worn or fouled spark plugs
- Failing ignition coils or coil-on-plug components
- Fuel injector failure, clogging, or poor spray pattern
- Low fuel pressure (weak pump, clogged filter, regulator fault)
- Vacuum leaks or intake manifold gasket leaks
- Faulty mass air flow (MAF) or MAP sensor
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or intermittent surging
- Reduced engine power or hesitation under load
- Poor fuel economy and increased emissions
- Occasional engine stumble or bucking
- Misfire detected in freeze frame or misfire counters
What to check
- Read stored/active DTCs and freeze-frame data; note rpm, load, temperature when misfire occurred
- Monitor live data: misfire counts per cylinder, long/short term fuel trim, fuel trims, MAF/MAP, O2 sensor voltages
- Scan for related codes (P0300–P0308 and sensor/fuel trim codes)
- Inspect spark plugs for wear, fouling, or oil contamination; check gap
- Test ignition coils (primary/secondary resistance, swap coil to see if misfire follows)
- Inspect wiring and connectors for coils and injectors; check grounds
Signal parameters
- Cylinder misfire counts (per-cylinder misfire counter)
- Crankshaft position sensor signal (timing/consistency)
- Camshaft position sensor signal
- Fuel rail pressure (psi or kPa)
- Injector pulse width (ms) and duty cycle
- Ignition coil primary and secondary resistance (ohms)
Diagnostic algorithm
- Retrieve freeze-frame and live data; confirm P1300 and check related P03xx codes to see if specific cylinders are identified.
- Clear codes, then perform a controlled road or loaded test while monitoring misfire counters and fuel/sensor data to reproduce the misfire.
- Inspect spark plugs and ignition coils on cylinders showing highest misfire counts; replace any plug or coil showing wear or failure.
- Swap ignition coil or injector between affected and known-good cylinder(s). If misfire follows the component, replace it.
- Measure fuel rail pressure and inspect fuel supply (pump, filter, regulator). Repair if pressure is out of specification.
- Perform injector tests (balance, current draw, spray pattern) and clean or replace clogged injectors.
- Check for intake vacuum leaks (smoke test), leaking intake manifold gaskets, or disconnected hoses; repair as needed.
- Test MAF/MAP and related sensors; clean MAF if contaminated, replace if out of spec. Verify fuel trims return to normal.
- If electrical faults suspected, inspect wiring harness, connectors, and grounds for intermittent faults; repair splices or corroded connectors.
- If misfire persists after ignition/fuel/sensor checks, perform compression and/or leak-down test to evaluate mechanical condition.
- After repair, clear codes and perform verification drive to ensure misfire no longer occurs and that fuel trims and O2 sensors behave normally.
Likely causes
- Worn or fouled spark plugs or failing coils
- Intermittent injector operation or clogged injector(s)
- Vacuum leak or intake leak causing lean condition
- Low fuel pressure or weak fuel pump
- Faulty MAF or MAP sensor skewing fuel delivery
- Intermittent wiring/connectors at coils/injectors or grounds
Fault status
Status
Random/multiple cylinder misfire detected — intermittent combustion misfire events recorded across one or more cylinders.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1300
HONDA
P — Powertrain
Random Misfire
Views:
UK: 27
EN: 47
RU: 42
AI status
Completed
Completed
100%
Causes
- Worn or fouled spark plugs
- Failing ignition coils or coil-on-plug components
- Fuel injector failure, clogging, or poor spray pattern
- Low fuel pressure (weak pump, clogged filter, regulator fault)
- Vacuum leaks or intake manifold gasket leaks
- Faulty mass air flow (MAF) or MAP sensor
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or intermittent surging
- Reduced engine power or hesitation under load
- Poor fuel economy and increased emissions
- Occasional engine stumble or bucking
- Misfire detected in freeze frame or misfire counters
What to check
- Read stored/active DTCs and freeze-frame data; note rpm, load, temperature when misfire occurred
- Monitor live data: misfire counts per cylinder, long/short term fuel trim, fuel trims, MAF/MAP, O2 sensor voltages
- Scan for related codes (P0300–P0308 and sensor/fuel trim codes)
- Inspect spark plugs for wear, fouling, or oil contamination; check gap
- Test ignition coils (primary/secondary resistance, swap coil to see if misfire follows)
- Inspect wiring and connectors for coils and injectors; check grounds
Signal parameters
- Cylinder misfire counts (per-cylinder misfire counter)
- Crankshaft position sensor signal (timing/consistency)
- Camshaft position sensor signal
- Fuel rail pressure (psi or kPa)
- Injector pulse width (ms) and duty cycle
- Ignition coil primary and secondary resistance (ohms)
Diagnostic algorithm
- Retrieve freeze-frame and live data; confirm P1300 and check related P03xx codes to see if specific cylinders are identified.
- Clear codes, then perform a controlled road or loaded test while monitoring misfire counters and fuel/sensor data to reproduce the misfire.
- Inspect spark plugs and ignition coils on cylinders showing highest misfire counts; replace any plug or coil showing wear or failure.
- Swap ignition coil or injector between affected and known-good cylinder(s). If misfire follows the component, replace it.
- Measure fuel rail pressure and inspect fuel supply (pump, filter, regulator). Repair if pressure is out of specification.
- Perform injector tests (balance, current draw, spray pattern) and clean or replace clogged injectors.
- Check for intake vacuum leaks (smoke test), leaking intake manifold gaskets, or disconnected hoses; repair as needed.
- Test MAF/MAP and related sensors; clean MAF if contaminated, replace if out of spec. Verify fuel trims return to normal.
- If electrical faults suspected, inspect wiring harness, connectors, and grounds for intermittent faults; repair splices or corroded connectors.
- If misfire persists after ignition/fuel/sensor checks, perform compression and/or leak-down test to evaluate mechanical condition.
- After repair, clear codes and perform verification drive to ensure misfire no longer occurs and that fuel trims and O2 sensors behave normally.
Likely causes
- Worn or fouled spark plugs or failing coils
- Intermittent injector operation or clogged injector(s)
- Vacuum leak or intake leak causing lean condition
- Low fuel pressure or weak fuel pump
- Faulty MAF or MAP sensor skewing fuel delivery
- Intermittent wiring/connectors at coils/injectors or grounds
Fault status
Status
Random/multiple cylinder misfire detected — intermittent combustion misfire events recorded across one or more cylinders.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1300
HUMMER
P — Powertrain
Ignitor Circuit
Views:
UK: 9
EN: 19
RU: 20
AI status
Completed
Completed
100%
Causes
- Worn or fouled spark plugs
- Failing ignition coils or coil-on-plug components
- Fuel injector failure, clogging, or poor spray pattern
- Low fuel pressure (weak pump, clogged filter, regulator fault)
- Vacuum leaks or intake manifold gasket leaks
- Faulty mass air flow (MAF) or MAP sensor
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or intermittent surging
- Reduced engine power or hesitation under load
- Poor fuel economy and increased emissions
- Occasional engine stumble or bucking
- Misfire detected in freeze frame or misfire counters
What to check
- Read stored/active DTCs and freeze-frame data; note rpm, load, temperature when misfire occurred
- Monitor live data: misfire counts per cylinder, long/short term fuel trim, fuel trims, MAF/MAP, O2 sensor voltages
- Scan for related codes (P0300–P0308 and sensor/fuel trim codes)
- Inspect spark plugs for wear, fouling, or oil contamination; check gap
- Test ignition coils (primary/secondary resistance, swap coil to see if misfire follows)
- Inspect wiring and connectors for coils and injectors; check grounds
Signal parameters
- Cylinder misfire counts (per-cylinder misfire counter)
- Crankshaft position sensor signal (timing/consistency)
- Camshaft position sensor signal
- Fuel rail pressure (psi or kPa)
- Injector pulse width (ms) and duty cycle
- Ignition coil primary and secondary resistance (ohms)
Diagnostic algorithm
- Retrieve freeze-frame and live data; confirm P1300 and check related P03xx codes to see if specific cylinders are identified.
- Clear codes, then perform a controlled road or loaded test while monitoring misfire counters and fuel/sensor data to reproduce the misfire.
- Inspect spark plugs and ignition coils on cylinders showing highest misfire counts; replace any plug or coil showing wear or failure.
- Swap ignition coil or injector between affected and known-good cylinder(s). If misfire follows the component, replace it.
- Measure fuel rail pressure and inspect fuel supply (pump, filter, regulator). Repair if pressure is out of specification.
- Perform injector tests (balance, current draw, spray pattern) and clean or replace clogged injectors.
- Check for intake vacuum leaks (smoke test), leaking intake manifold gaskets, or disconnected hoses; repair as needed.
- Test MAF/MAP and related sensors; clean MAF if contaminated, replace if out of spec. Verify fuel trims return to normal.
- If electrical faults suspected, inspect wiring harness, connectors, and grounds for intermittent faults; repair splices or corroded connectors.
- If misfire persists after ignition/fuel/sensor checks, perform compression and/or leak-down test to evaluate mechanical condition.
- After repair, clear codes and perform verification drive to ensure misfire no longer occurs and that fuel trims and O2 sensors behave normally.
Likely causes
- Worn or fouled spark plugs or failing coils
- Intermittent injector operation or clogged injector(s)
- Vacuum leak or intake leak causing lean condition
- Low fuel pressure or weak fuel pump
- Faulty MAF or MAP sensor skewing fuel delivery
- Intermittent wiring/connectors at coils/injectors or grounds
Fault status
Status
Random/multiple cylinder misfire detected — intermittent combustion misfire events recorded across one or more cylinders.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1300
INFINITI
P — Powertrain
Random Misfire
Views:
UK: 26
EN: 42
RU: 39
AI status
Completed
Completed
100%
Causes
- Worn or fouled spark plugs
- Failing ignition coils or coil-on-plug components
- Fuel injector failure, clogging, or poor spray pattern
- Low fuel pressure (weak pump, clogged filter, regulator fault)
- Vacuum leaks or intake manifold gasket leaks
- Faulty mass air flow (MAF) or MAP sensor
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or intermittent surging
- Reduced engine power or hesitation under load
- Poor fuel economy and increased emissions
- Occasional engine stumble or bucking
- Misfire detected in freeze frame or misfire counters
What to check
- Read stored/active DTCs and freeze-frame data; note rpm, load, temperature when misfire occurred
- Monitor live data: misfire counts per cylinder, long/short term fuel trim, fuel trims, MAF/MAP, O2 sensor voltages
- Scan for related codes (P0300–P0308 and sensor/fuel trim codes)
- Inspect spark plugs for wear, fouling, or oil contamination; check gap
- Test ignition coils (primary/secondary resistance, swap coil to see if misfire follows)
- Inspect wiring and connectors for coils and injectors; check grounds
Signal parameters
- Cylinder misfire counts (per-cylinder misfire counter)
- Crankshaft position sensor signal (timing/consistency)
- Camshaft position sensor signal
- Fuel rail pressure (psi or kPa)
- Injector pulse width (ms) and duty cycle
- Ignition coil primary and secondary resistance (ohms)
Diagnostic algorithm
- Retrieve freeze-frame and live data; confirm P1300 and check related P03xx codes to see if specific cylinders are identified.
- Clear codes, then perform a controlled road or loaded test while monitoring misfire counters and fuel/sensor data to reproduce the misfire.
- Inspect spark plugs and ignition coils on cylinders showing highest misfire counts; replace any plug or coil showing wear or failure.
- Swap ignition coil or injector between affected and known-good cylinder(s). If misfire follows the component, replace it.
- Measure fuel rail pressure and inspect fuel supply (pump, filter, regulator). Repair if pressure is out of specification.
- Perform injector tests (balance, current draw, spray pattern) and clean or replace clogged injectors.
- Check for intake vacuum leaks (smoke test), leaking intake manifold gaskets, or disconnected hoses; repair as needed.
- Test MAF/MAP and related sensors; clean MAF if contaminated, replace if out of spec. Verify fuel trims return to normal.
- If electrical faults suspected, inspect wiring harness, connectors, and grounds for intermittent faults; repair splices or corroded connectors.
- If misfire persists after ignition/fuel/sensor checks, perform compression and/or leak-down test to evaluate mechanical condition.
- After repair, clear codes and perform verification drive to ensure misfire no longer occurs and that fuel trims and O2 sensors behave normally.
Likely causes
- Worn or fouled spark plugs or failing coils
- Intermittent injector operation or clogged injector(s)
- Vacuum leak or intake leak causing lean condition
- Low fuel pressure or weak fuel pump
- Faulty MAF or MAP sensor skewing fuel delivery
- Intermittent wiring/connectors at coils/injectors or grounds
Fault status
Status
Random/multiple cylinder misfire detected — intermittent combustion misfire events recorded across one or more cylinders.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1300
LEXUS
P — Powertrain
Igniter Circuit Malfunction Bank 1 Or No 1
Views:
UK: 27
EN: 46
RU: 39
AI status
Completed
Completed
100%
Causes
- Worn or fouled spark plugs
- Failing ignition coils or coil-on-plug components
- Fuel injector failure, clogging, or poor spray pattern
- Low fuel pressure (weak pump, clogged filter, regulator fault)
- Vacuum leaks or intake manifold gasket leaks
- Faulty mass air flow (MAF) or MAP sensor
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or intermittent surging
- Reduced engine power or hesitation under load
- Poor fuel economy and increased emissions
- Occasional engine stumble or bucking
- Misfire detected in freeze frame or misfire counters
What to check
- Read stored/active DTCs and freeze-frame data; note rpm, load, temperature when misfire occurred
- Monitor live data: misfire counts per cylinder, long/short term fuel trim, fuel trims, MAF/MAP, O2 sensor voltages
- Scan for related codes (P0300–P0308 and sensor/fuel trim codes)
- Inspect spark plugs for wear, fouling, or oil contamination; check gap
- Test ignition coils (primary/secondary resistance, swap coil to see if misfire follows)
- Inspect wiring and connectors for coils and injectors; check grounds
Signal parameters
- Cylinder misfire counts (per-cylinder misfire counter)
- Crankshaft position sensor signal (timing/consistency)
- Camshaft position sensor signal
- Fuel rail pressure (psi or kPa)
- Injector pulse width (ms) and duty cycle
- Ignition coil primary and secondary resistance (ohms)
Diagnostic algorithm
- Retrieve freeze-frame and live data; confirm P1300 and check related P03xx codes to see if specific cylinders are identified.
- Clear codes, then perform a controlled road or loaded test while monitoring misfire counters and fuel/sensor data to reproduce the misfire.
- Inspect spark plugs and ignition coils on cylinders showing highest misfire counts; replace any plug or coil showing wear or failure.
- Swap ignition coil or injector between affected and known-good cylinder(s). If misfire follows the component, replace it.
- Measure fuel rail pressure and inspect fuel supply (pump, filter, regulator). Repair if pressure is out of specification.
- Perform injector tests (balance, current draw, spray pattern) and clean or replace clogged injectors.
- Check for intake vacuum leaks (smoke test), leaking intake manifold gaskets, or disconnected hoses; repair as needed.
- Test MAF/MAP and related sensors; clean MAF if contaminated, replace if out of spec. Verify fuel trims return to normal.
- If electrical faults suspected, inspect wiring harness, connectors, and grounds for intermittent faults; repair splices or corroded connectors.
- If misfire persists after ignition/fuel/sensor checks, perform compression and/or leak-down test to evaluate mechanical condition.
- After repair, clear codes and perform verification drive to ensure misfire no longer occurs and that fuel trims and O2 sensors behave normally.
Likely causes
- Worn or fouled spark plugs or failing coils
- Intermittent injector operation or clogged injector(s)
- Vacuum leak or intake leak causing lean condition
- Low fuel pressure or weak fuel pump
- Faulty MAF or MAP sensor skewing fuel delivery
- Intermittent wiring/connectors at coils/injectors or grounds
Fault status
Status
Random/multiple cylinder misfire detected — intermittent combustion misfire events recorded across one or more cylinders.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1300
LINCOLN
P — Powertrain
Boost Calibration Fault
Views:
UK: 26
EN: 48
RU: 41
AI status
Completed
Completed
100%
Causes
- Worn or fouled spark plugs
- Failing ignition coils or coil-on-plug components
- Fuel injector failure, clogging, or poor spray pattern
- Low fuel pressure (weak pump, clogged filter, regulator fault)
- Vacuum leaks or intake manifold gasket leaks
- Faulty mass air flow (MAF) or MAP sensor
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or intermittent surging
- Reduced engine power or hesitation under load
- Poor fuel economy and increased emissions
- Occasional engine stumble or bucking
- Misfire detected in freeze frame or misfire counters
What to check
- Read stored/active DTCs and freeze-frame data; note rpm, load, temperature when misfire occurred
- Monitor live data: misfire counts per cylinder, long/short term fuel trim, fuel trims, MAF/MAP, O2 sensor voltages
- Scan for related codes (P0300–P0308 and sensor/fuel trim codes)
- Inspect spark plugs for wear, fouling, or oil contamination; check gap
- Test ignition coils (primary/secondary resistance, swap coil to see if misfire follows)
- Inspect wiring and connectors for coils and injectors; check grounds
Signal parameters
- Cylinder misfire counts (per-cylinder misfire counter)
- Crankshaft position sensor signal (timing/consistency)
- Camshaft position sensor signal
- Fuel rail pressure (psi or kPa)
- Injector pulse width (ms) and duty cycle
- Ignition coil primary and secondary resistance (ohms)
Diagnostic algorithm
- Retrieve freeze-frame and live data; confirm P1300 and check related P03xx codes to see if specific cylinders are identified.
- Clear codes, then perform a controlled road or loaded test while monitoring misfire counters and fuel/sensor data to reproduce the misfire.
- Inspect spark plugs and ignition coils on cylinders showing highest misfire counts; replace any plug or coil showing wear or failure.
- Swap ignition coil or injector between affected and known-good cylinder(s). If misfire follows the component, replace it.
- Measure fuel rail pressure and inspect fuel supply (pump, filter, regulator). Repair if pressure is out of specification.
- Perform injector tests (balance, current draw, spray pattern) and clean or replace clogged injectors.
- Check for intake vacuum leaks (smoke test), leaking intake manifold gaskets, or disconnected hoses; repair as needed.
- Test MAF/MAP and related sensors; clean MAF if contaminated, replace if out of spec. Verify fuel trims return to normal.
- If electrical faults suspected, inspect wiring harness, connectors, and grounds for intermittent faults; repair splices or corroded connectors.
- If misfire persists after ignition/fuel/sensor checks, perform compression and/or leak-down test to evaluate mechanical condition.
- After repair, clear codes and perform verification drive to ensure misfire no longer occurs and that fuel trims and O2 sensors behave normally.
Likely causes
- Worn or fouled spark plugs or failing coils
- Intermittent injector operation or clogged injector(s)
- Vacuum leak or intake leak causing lean condition
- Low fuel pressure or weak fuel pump
- Faulty MAF or MAP sensor skewing fuel delivery
- Intermittent wiring/connectors at coils/injectors or grounds
Fault status
Status
Random/multiple cylinder misfire detected — intermittent combustion misfire events recorded across one or more cylinders.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1300
MERCURY
P — Powertrain
Boost Calibration Fault
Views:
UK: 29
EN: 43
RU: 36
AI status
Completed
Completed
100%
Causes
- Worn or fouled spark plugs
- Failing ignition coils or coil-on-plug components
- Fuel injector failure, clogging, or poor spray pattern
- Low fuel pressure (weak pump, clogged filter, regulator fault)
- Vacuum leaks or intake manifold gasket leaks
- Faulty mass air flow (MAF) or MAP sensor
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or intermittent surging
- Reduced engine power or hesitation under load
- Poor fuel economy and increased emissions
- Occasional engine stumble or bucking
- Misfire detected in freeze frame or misfire counters
What to check
- Read stored/active DTCs and freeze-frame data; note rpm, load, temperature when misfire occurred
- Monitor live data: misfire counts per cylinder, long/short term fuel trim, fuel trims, MAF/MAP, O2 sensor voltages
- Scan for related codes (P0300–P0308 and sensor/fuel trim codes)
- Inspect spark plugs for wear, fouling, or oil contamination; check gap
- Test ignition coils (primary/secondary resistance, swap coil to see if misfire follows)
- Inspect wiring and connectors for coils and injectors; check grounds
Signal parameters
- Cylinder misfire counts (per-cylinder misfire counter)
- Crankshaft position sensor signal (timing/consistency)
- Camshaft position sensor signal
- Fuel rail pressure (psi or kPa)
- Injector pulse width (ms) and duty cycle
- Ignition coil primary and secondary resistance (ohms)
Diagnostic algorithm
- Retrieve freeze-frame and live data; confirm P1300 and check related P03xx codes to see if specific cylinders are identified.
- Clear codes, then perform a controlled road or loaded test while monitoring misfire counters and fuel/sensor data to reproduce the misfire.
- Inspect spark plugs and ignition coils on cylinders showing highest misfire counts; replace any plug or coil showing wear or failure.
- Swap ignition coil or injector between affected and known-good cylinder(s). If misfire follows the component, replace it.
- Measure fuel rail pressure and inspect fuel supply (pump, filter, regulator). Repair if pressure is out of specification.
- Perform injector tests (balance, current draw, spray pattern) and clean or replace clogged injectors.
- Check for intake vacuum leaks (smoke test), leaking intake manifold gaskets, or disconnected hoses; repair as needed.
- Test MAF/MAP and related sensors; clean MAF if contaminated, replace if out of spec. Verify fuel trims return to normal.
- If electrical faults suspected, inspect wiring harness, connectors, and grounds for intermittent faults; repair splices or corroded connectors.
- If misfire persists after ignition/fuel/sensor checks, perform compression and/or leak-down test to evaluate mechanical condition.
- After repair, clear codes and perform verification drive to ensure misfire no longer occurs and that fuel trims and O2 sensors behave normally.
Likely causes
- Worn or fouled spark plugs or failing coils
- Intermittent injector operation or clogged injector(s)
- Vacuum leak or intake leak causing lean condition
- Low fuel pressure or weak fuel pump
- Faulty MAF or MAP sensor skewing fuel delivery
- Intermittent wiring/connectors at coils/injectors or grounds
Fault status
Status
Random/multiple cylinder misfire detected — intermittent combustion misfire events recorded across one or more cylinders.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1300
MITSUBISHI
P — Powertrain
Ignition Timing Adjustment Circuit
Views:
UK: 30
EN: 42
RU: 36
AI status
Completed
Completed
100%
Causes
- Worn or fouled spark plugs
- Failing ignition coils or coil-on-plug components
- Fuel injector failure, clogging, or poor spray pattern
- Low fuel pressure (weak pump, clogged filter, regulator fault)
- Vacuum leaks or intake manifold gasket leaks
- Faulty mass air flow (MAF) or MAP sensor
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or intermittent surging
- Reduced engine power or hesitation under load
- Poor fuel economy and increased emissions
- Occasional engine stumble or bucking
- Misfire detected in freeze frame or misfire counters
What to check
- Read stored/active DTCs and freeze-frame data; note rpm, load, temperature when misfire occurred
- Monitor live data: misfire counts per cylinder, long/short term fuel trim, fuel trims, MAF/MAP, O2 sensor voltages
- Scan for related codes (P0300–P0308 and sensor/fuel trim codes)
- Inspect spark plugs for wear, fouling, or oil contamination; check gap
- Test ignition coils (primary/secondary resistance, swap coil to see if misfire follows)
- Inspect wiring and connectors for coils and injectors; check grounds
Signal parameters
- Cylinder misfire counts (per-cylinder misfire counter)
- Crankshaft position sensor signal (timing/consistency)
- Camshaft position sensor signal
- Fuel rail pressure (psi or kPa)
- Injector pulse width (ms) and duty cycle
- Ignition coil primary and secondary resistance (ohms)
Diagnostic algorithm
- Retrieve freeze-frame and live data; confirm P1300 and check related P03xx codes to see if specific cylinders are identified.
- Clear codes, then perform a controlled road or loaded test while monitoring misfire counters and fuel/sensor data to reproduce the misfire.
- Inspect spark plugs and ignition coils on cylinders showing highest misfire counts; replace any plug or coil showing wear or failure.
- Swap ignition coil or injector between affected and known-good cylinder(s). If misfire follows the component, replace it.
- Measure fuel rail pressure and inspect fuel supply (pump, filter, regulator). Repair if pressure is out of specification.
- Perform injector tests (balance, current draw, spray pattern) and clean or replace clogged injectors.
- Check for intake vacuum leaks (smoke test), leaking intake manifold gaskets, or disconnected hoses; repair as needed.
- Test MAF/MAP and related sensors; clean MAF if contaminated, replace if out of spec. Verify fuel trims return to normal.
- If electrical faults suspected, inspect wiring harness, connectors, and grounds for intermittent faults; repair splices or corroded connectors.
- If misfire persists after ignition/fuel/sensor checks, perform compression and/or leak-down test to evaluate mechanical condition.
- After repair, clear codes and perform verification drive to ensure misfire no longer occurs and that fuel trims and O2 sensors behave normally.
Likely causes
- Worn or fouled spark plugs or failing coils
- Intermittent injector operation or clogged injector(s)
- Vacuum leak or intake leak causing lean condition
- Low fuel pressure or weak fuel pump
- Faulty MAF or MAP sensor skewing fuel delivery
- Intermittent wiring/connectors at coils/injectors or grounds
Fault status
Status
Random/multiple cylinder misfire detected — intermittent combustion misfire events recorded across one or more cylinders.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1300
OLDSMOBILE
P — Powertrain
Ignitor Circuit
Views:
UK: 26
EN: 42
RU: 37
AI status
Completed
Completed
100%
Causes
- Worn or fouled spark plugs
- Failing ignition coils or coil-on-plug components
- Fuel injector failure, clogging, or poor spray pattern
- Low fuel pressure (weak pump, clogged filter, regulator fault)
- Vacuum leaks or intake manifold gasket leaks
- Faulty mass air flow (MAF) or MAP sensor
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or intermittent surging
- Reduced engine power or hesitation under load
- Poor fuel economy and increased emissions
- Occasional engine stumble or bucking
- Misfire detected in freeze frame or misfire counters
What to check
- Read stored/active DTCs and freeze-frame data; note rpm, load, temperature when misfire occurred
- Monitor live data: misfire counts per cylinder, long/short term fuel trim, fuel trims, MAF/MAP, O2 sensor voltages
- Scan for related codes (P0300–P0308 and sensor/fuel trim codes)
- Inspect spark plugs for wear, fouling, or oil contamination; check gap
- Test ignition coils (primary/secondary resistance, swap coil to see if misfire follows)
- Inspect wiring and connectors for coils and injectors; check grounds
Signal parameters
- Cylinder misfire counts (per-cylinder misfire counter)
- Crankshaft position sensor signal (timing/consistency)
- Camshaft position sensor signal
- Fuel rail pressure (psi or kPa)
- Injector pulse width (ms) and duty cycle
- Ignition coil primary and secondary resistance (ohms)
Diagnostic algorithm
- Retrieve freeze-frame and live data; confirm P1300 and check related P03xx codes to see if specific cylinders are identified.
- Clear codes, then perform a controlled road or loaded test while monitoring misfire counters and fuel/sensor data to reproduce the misfire.
- Inspect spark plugs and ignition coils on cylinders showing highest misfire counts; replace any plug or coil showing wear or failure.
- Swap ignition coil or injector between affected and known-good cylinder(s). If misfire follows the component, replace it.
- Measure fuel rail pressure and inspect fuel supply (pump, filter, regulator). Repair if pressure is out of specification.
- Perform injector tests (balance, current draw, spray pattern) and clean or replace clogged injectors.
- Check for intake vacuum leaks (smoke test), leaking intake manifold gaskets, or disconnected hoses; repair as needed.
- Test MAF/MAP and related sensors; clean MAF if contaminated, replace if out of spec. Verify fuel trims return to normal.
- If electrical faults suspected, inspect wiring harness, connectors, and grounds for intermittent faults; repair splices or corroded connectors.
- If misfire persists after ignition/fuel/sensor checks, perform compression and/or leak-down test to evaluate mechanical condition.
- After repair, clear codes and perform verification drive to ensure misfire no longer occurs and that fuel trims and O2 sensors behave normally.
Likely causes
- Worn or fouled spark plugs or failing coils
- Intermittent injector operation or clogged injector(s)
- Vacuum leak or intake leak causing lean condition
- Low fuel pressure or weak fuel pump
- Faulty MAF or MAP sensor skewing fuel delivery
- Intermittent wiring/connectors at coils/injectors or grounds
Fault status
Status
Random/multiple cylinder misfire detected — intermittent combustion misfire events recorded across one or more cylinders.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1300
Other
P — Powertrain
Boost Calibration Fault
Views:
UK: 29
EN: 45
RU: 42
AI status
Completed
Completed
100%
Causes
- Worn or fouled spark plugs
- Failing ignition coils or coil-on-plug components
- Fuel injector failure, clogging, or poor spray pattern
- Low fuel pressure (weak pump, clogged filter, regulator fault)
- Vacuum leaks or intake manifold gasket leaks
- Faulty mass air flow (MAF) or MAP sensor
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or intermittent surging
- Reduced engine power or hesitation under load
- Poor fuel economy and increased emissions
- Occasional engine stumble or bucking
- Misfire detected in freeze frame or misfire counters
What to check
- Read stored/active DTCs and freeze-frame data; note rpm, load, temperature when misfire occurred
- Monitor live data: misfire counts per cylinder, long/short term fuel trim, fuel trims, MAF/MAP, O2 sensor voltages
- Scan for related codes (P0300–P0308 and sensor/fuel trim codes)
- Inspect spark plugs for wear, fouling, or oil contamination; check gap
- Test ignition coils (primary/secondary resistance, swap coil to see if misfire follows)
- Inspect wiring and connectors for coils and injectors; check grounds
Signal parameters
- Cylinder misfire counts (per-cylinder misfire counter)
- Crankshaft position sensor signal (timing/consistency)
- Camshaft position sensor signal
- Fuel rail pressure (psi or kPa)
- Injector pulse width (ms) and duty cycle
- Ignition coil primary and secondary resistance (ohms)
Diagnostic algorithm
- Retrieve freeze-frame and live data; confirm P1300 and check related P03xx codes to see if specific cylinders are identified.
- Clear codes, then perform a controlled road or loaded test while monitoring misfire counters and fuel/sensor data to reproduce the misfire.
- Inspect spark plugs and ignition coils on cylinders showing highest misfire counts; replace any plug or coil showing wear or failure.
- Swap ignition coil or injector between affected and known-good cylinder(s). If misfire follows the component, replace it.
- Measure fuel rail pressure and inspect fuel supply (pump, filter, regulator). Repair if pressure is out of specification.
- Perform injector tests (balance, current draw, spray pattern) and clean or replace clogged injectors.
- Check for intake vacuum leaks (smoke test), leaking intake manifold gaskets, or disconnected hoses; repair as needed.
- Test MAF/MAP and related sensors; clean MAF if contaminated, replace if out of spec. Verify fuel trims return to normal.
- If electrical faults suspected, inspect wiring harness, connectors, and grounds for intermittent faults; repair splices or corroded connectors.
- If misfire persists after ignition/fuel/sensor checks, perform compression and/or leak-down test to evaluate mechanical condition.
- After repair, clear codes and perform verification drive to ensure misfire no longer occurs and that fuel trims and O2 sensors behave normally.
Likely causes
- Worn or fouled spark plugs or failing coils
- Intermittent injector operation or clogged injector(s)
- Vacuum leak or intake leak causing lean condition
- Low fuel pressure or weak fuel pump
- Faulty MAF or MAP sensor skewing fuel delivery
- Intermittent wiring/connectors at coils/injectors or grounds
Fault status
Status
Random/multiple cylinder misfire detected — intermittent combustion misfire events recorded across one or more cylinders.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1300
RAM
P — Powertrain
Ignition timing adjustment circuit failure
Views:
UK: 4
EN: 5
RU: 7
AI status
Completed
Completed
100%
Causes
- Worn or fouled spark plugs
- Failing ignition coils or coil-on-plug components
- Fuel injector failure, clogging, or poor spray pattern
- Low fuel pressure (weak pump, clogged filter, regulator fault)
- Vacuum leaks or intake manifold gasket leaks
- Faulty mass air flow (MAF) or MAP sensor
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or intermittent surging
- Reduced engine power or hesitation under load
- Poor fuel economy and increased emissions
- Occasional engine stumble or bucking
- Misfire detected in freeze frame or misfire counters
What to check
- Read stored/active DTCs and freeze-frame data; note rpm, load, temperature when misfire occurred
- Monitor live data: misfire counts per cylinder, long/short term fuel trim, fuel trims, MAF/MAP, O2 sensor voltages
- Scan for related codes (P0300–P0308 and sensor/fuel trim codes)
- Inspect spark plugs for wear, fouling, or oil contamination; check gap
- Test ignition coils (primary/secondary resistance, swap coil to see if misfire follows)
- Inspect wiring and connectors for coils and injectors; check grounds
Signal parameters
- Cylinder misfire counts (per-cylinder misfire counter)
- Crankshaft position sensor signal (timing/consistency)
- Camshaft position sensor signal
- Fuel rail pressure (psi or kPa)
- Injector pulse width (ms) and duty cycle
- Ignition coil primary and secondary resistance (ohms)
Diagnostic algorithm
- Retrieve freeze-frame and live data; confirm P1300 and check related P03xx codes to see if specific cylinders are identified.
- Clear codes, then perform a controlled road or loaded test while monitoring misfire counters and fuel/sensor data to reproduce the misfire.
- Inspect spark plugs and ignition coils on cylinders showing highest misfire counts; replace any plug or coil showing wear or failure.
- Swap ignition coil or injector between affected and known-good cylinder(s). If misfire follows the component, replace it.
- Measure fuel rail pressure and inspect fuel supply (pump, filter, regulator). Repair if pressure is out of specification.
- Perform injector tests (balance, current draw, spray pattern) and clean or replace clogged injectors.
- Check for intake vacuum leaks (smoke test), leaking intake manifold gaskets, or disconnected hoses; repair as needed.
- Test MAF/MAP and related sensors; clean MAF if contaminated, replace if out of spec. Verify fuel trims return to normal.
- If electrical faults suspected, inspect wiring harness, connectors, and grounds for intermittent faults; repair splices or corroded connectors.
- If misfire persists after ignition/fuel/sensor checks, perform compression and/or leak-down test to evaluate mechanical condition.
- After repair, clear codes and perform verification drive to ensure misfire no longer occurs and that fuel trims and O2 sensors behave normally.
Likely causes
- Worn or fouled spark plugs or failing coils
- Intermittent injector operation or clogged injector(s)
- Vacuum leak or intake leak causing lean condition
- Low fuel pressure or weak fuel pump
- Faulty MAF or MAP sensor skewing fuel delivery
- Intermittent wiring/connectors at coils/injectors or grounds
Fault status
Status
Random/multiple cylinder misfire detected — intermittent combustion misfire events recorded across one or more cylinders.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1300
SAAB
P — Powertrain
Torque Limitation Signal Low
Views:
UK: 4
EN: 3
RU: 7
AI status
Completed
Completed
100%
Causes
- Worn or fouled spark plugs
- Failing ignition coils or coil-on-plug components
- Fuel injector failure, clogging, or poor spray pattern
- Low fuel pressure (weak pump, clogged filter, regulator fault)
- Vacuum leaks or intake manifold gasket leaks
- Faulty mass air flow (MAF) or MAP sensor
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or intermittent surging
- Reduced engine power or hesitation under load
- Poor fuel economy and increased emissions
- Occasional engine stumble or bucking
- Misfire detected in freeze frame or misfire counters
What to check
- Read stored/active DTCs and freeze-frame data; note rpm, load, temperature when misfire occurred
- Monitor live data: misfire counts per cylinder, long/short term fuel trim, fuel trims, MAF/MAP, O2 sensor voltages
- Scan for related codes (P0300–P0308 and sensor/fuel trim codes)
- Inspect spark plugs for wear, fouling, or oil contamination; check gap
- Test ignition coils (primary/secondary resistance, swap coil to see if misfire follows)
- Inspect wiring and connectors for coils and injectors; check grounds
Signal parameters
- Cylinder misfire counts (per-cylinder misfire counter)
- Crankshaft position sensor signal (timing/consistency)
- Camshaft position sensor signal
- Fuel rail pressure (psi or kPa)
- Injector pulse width (ms) and duty cycle
- Ignition coil primary and secondary resistance (ohms)
Diagnostic algorithm
- Retrieve freeze-frame and live data; confirm P1300 and check related P03xx codes to see if specific cylinders are identified.
- Clear codes, then perform a controlled road or loaded test while monitoring misfire counters and fuel/sensor data to reproduce the misfire.
- Inspect spark plugs and ignition coils on cylinders showing highest misfire counts; replace any plug or coil showing wear or failure.
- Swap ignition coil or injector between affected and known-good cylinder(s). If misfire follows the component, replace it.
- Measure fuel rail pressure and inspect fuel supply (pump, filter, regulator). Repair if pressure is out of specification.
- Perform injector tests (balance, current draw, spray pattern) and clean or replace clogged injectors.
- Check for intake vacuum leaks (smoke test), leaking intake manifold gaskets, or disconnected hoses; repair as needed.
- Test MAF/MAP and related sensors; clean MAF if contaminated, replace if out of spec. Verify fuel trims return to normal.
- If electrical faults suspected, inspect wiring harness, connectors, and grounds for intermittent faults; repair splices or corroded connectors.
- If misfire persists after ignition/fuel/sensor checks, perform compression and/or leak-down test to evaluate mechanical condition.
- After repair, clear codes and perform verification drive to ensure misfire no longer occurs and that fuel trims and O2 sensors behave normally.
Likely causes
- Worn or fouled spark plugs or failing coils
- Intermittent injector operation or clogged injector(s)
- Vacuum leak or intake leak causing lean condition
- Low fuel pressure or weak fuel pump
- Faulty MAF or MAP sensor skewing fuel delivery
- Intermittent wiring/connectors at coils/injectors or grounds
Fault status
Status
Random/multiple cylinder misfire detected — intermittent combustion misfire events recorded across one or more cylinders.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1300
SATURN
P — Powertrain
Ignitor Circuit
Views:
UK: 33
EN: 90
RU: 40
AI status
Completed
Completed
100%
Causes
- Worn or fouled spark plugs
- Failing ignition coils or coil-on-plug components
- Fuel injector failure, clogging, or poor spray pattern
- Low fuel pressure (weak pump, clogged filter, regulator fault)
- Vacuum leaks or intake manifold gasket leaks
- Faulty mass air flow (MAF) or MAP sensor
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or intermittent surging
- Reduced engine power or hesitation under load
- Poor fuel economy and increased emissions
- Occasional engine stumble or bucking
- Misfire detected in freeze frame or misfire counters
What to check
- Read stored/active DTCs and freeze-frame data; note rpm, load, temperature when misfire occurred
- Monitor live data: misfire counts per cylinder, long/short term fuel trim, fuel trims, MAF/MAP, O2 sensor voltages
- Scan for related codes (P0300–P0308 and sensor/fuel trim codes)
- Inspect spark plugs for wear, fouling, or oil contamination; check gap
- Test ignition coils (primary/secondary resistance, swap coil to see if misfire follows)
- Inspect wiring and connectors for coils and injectors; check grounds
Signal parameters
- Cylinder misfire counts (per-cylinder misfire counter)
- Crankshaft position sensor signal (timing/consistency)
- Camshaft position sensor signal
- Fuel rail pressure (psi or kPa)
- Injector pulse width (ms) and duty cycle
- Ignition coil primary and secondary resistance (ohms)
Diagnostic algorithm
- Retrieve freeze-frame and live data; confirm P1300 and check related P03xx codes to see if specific cylinders are identified.
- Clear codes, then perform a controlled road or loaded test while monitoring misfire counters and fuel/sensor data to reproduce the misfire.
- Inspect spark plugs and ignition coils on cylinders showing highest misfire counts; replace any plug or coil showing wear or failure.
- Swap ignition coil or injector between affected and known-good cylinder(s). If misfire follows the component, replace it.
- Measure fuel rail pressure and inspect fuel supply (pump, filter, regulator). Repair if pressure is out of specification.
- Perform injector tests (balance, current draw, spray pattern) and clean or replace clogged injectors.
- Check for intake vacuum leaks (smoke test), leaking intake manifold gaskets, or disconnected hoses; repair as needed.
- Test MAF/MAP and related sensors; clean MAF if contaminated, replace if out of spec. Verify fuel trims return to normal.
- If electrical faults suspected, inspect wiring harness, connectors, and grounds for intermittent faults; repair splices or corroded connectors.
- If misfire persists after ignition/fuel/sensor checks, perform compression and/or leak-down test to evaluate mechanical condition.
- After repair, clear codes and perform verification drive to ensure misfire no longer occurs and that fuel trims and O2 sensors behave normally.
Likely causes
- Worn or fouled spark plugs or failing coils
- Intermittent injector operation or clogged injector(s)
- Vacuum leak or intake leak causing lean condition
- Low fuel pressure or weak fuel pump
- Faulty MAF or MAP sensor skewing fuel delivery
- Intermittent wiring/connectors at coils/injectors or grounds
Fault status
Status
Random/multiple cylinder misfire detected — intermittent combustion misfire events recorded across one or more cylinders.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
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Code
P1300
SCION
P — Powertrain
Igniter circuit malfunction
Views:
UK: 3
EN: 3
RU: 6
AI status
Completed
Completed
100%
Causes
- Worn or fouled spark plugs
- Failing ignition coils or coil-on-plug components
- Fuel injector failure, clogging, or poor spray pattern
- Low fuel pressure (weak pump, clogged filter, regulator fault)
- Vacuum leaks or intake manifold gasket leaks
- Faulty mass air flow (MAF) or MAP sensor
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or intermittent surging
- Reduced engine power or hesitation under load
- Poor fuel economy and increased emissions
- Occasional engine stumble or bucking
- Misfire detected in freeze frame or misfire counters
What to check
- Read stored/active DTCs and freeze-frame data; note rpm, load, temperature when misfire occurred
- Monitor live data: misfire counts per cylinder, long/short term fuel trim, fuel trims, MAF/MAP, O2 sensor voltages
- Scan for related codes (P0300–P0308 and sensor/fuel trim codes)
- Inspect spark plugs for wear, fouling, or oil contamination; check gap
- Test ignition coils (primary/secondary resistance, swap coil to see if misfire follows)
- Inspect wiring and connectors for coils and injectors; check grounds
Signal parameters
- Cylinder misfire counts (per-cylinder misfire counter)
- Crankshaft position sensor signal (timing/consistency)
- Camshaft position sensor signal
- Fuel rail pressure (psi or kPa)
- Injector pulse width (ms) and duty cycle
- Ignition coil primary and secondary resistance (ohms)
Diagnostic algorithm
- Retrieve freeze-frame and live data; confirm P1300 and check related P03xx codes to see if specific cylinders are identified.
- Clear codes, then perform a controlled road or loaded test while monitoring misfire counters and fuel/sensor data to reproduce the misfire.
- Inspect spark plugs and ignition coils on cylinders showing highest misfire counts; replace any plug or coil showing wear or failure.
- Swap ignition coil or injector between affected and known-good cylinder(s). If misfire follows the component, replace it.
- Measure fuel rail pressure and inspect fuel supply (pump, filter, regulator). Repair if pressure is out of specification.
- Perform injector tests (balance, current draw, spray pattern) and clean or replace clogged injectors.
- Check for intake vacuum leaks (smoke test), leaking intake manifold gaskets, or disconnected hoses; repair as needed.
- Test MAF/MAP and related sensors; clean MAF if contaminated, replace if out of spec. Verify fuel trims return to normal.
- If electrical faults suspected, inspect wiring harness, connectors, and grounds for intermittent faults; repair splices or corroded connectors.
- If misfire persists after ignition/fuel/sensor checks, perform compression and/or leak-down test to evaluate mechanical condition.
- After repair, clear codes and perform verification drive to ensure misfire no longer occurs and that fuel trims and O2 sensors behave normally.
Likely causes
- Worn or fouled spark plugs or failing coils
- Intermittent injector operation or clogged injector(s)
- Vacuum leak or intake leak causing lean condition
- Low fuel pressure or weak fuel pump
- Faulty MAF or MAP sensor skewing fuel delivery
- Intermittent wiring/connectors at coils/injectors or grounds
Fault status
Status
Random/multiple cylinder misfire detected — intermittent combustion misfire events recorded across one or more cylinders.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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Code
P1300
TOYOTA
P — Powertrain
Igniter Circuit Malfunction No 1
Views:
UK: 26
EN: 43
RU: 40
AI status
Completed
Completed
100%
Causes
- Worn or fouled spark plugs
- Failing ignition coils or coil-on-plug components
- Fuel injector failure, clogging, or poor spray pattern
- Low fuel pressure (weak pump, clogged filter, regulator fault)
- Vacuum leaks or intake manifold gasket leaks
- Faulty mass air flow (MAF) or MAP sensor
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or intermittent surging
- Reduced engine power or hesitation under load
- Poor fuel economy and increased emissions
- Occasional engine stumble or bucking
- Misfire detected in freeze frame or misfire counters
What to check
- Read stored/active DTCs and freeze-frame data; note rpm, load, temperature when misfire occurred
- Monitor live data: misfire counts per cylinder, long/short term fuel trim, fuel trims, MAF/MAP, O2 sensor voltages
- Scan for related codes (P0300–P0308 and sensor/fuel trim codes)
- Inspect spark plugs for wear, fouling, or oil contamination; check gap
- Test ignition coils (primary/secondary resistance, swap coil to see if misfire follows)
- Inspect wiring and connectors for coils and injectors; check grounds
Signal parameters
- Cylinder misfire counts (per-cylinder misfire counter)
- Crankshaft position sensor signal (timing/consistency)
- Camshaft position sensor signal
- Fuel rail pressure (psi or kPa)
- Injector pulse width (ms) and duty cycle
- Ignition coil primary and secondary resistance (ohms)
Diagnostic algorithm
- Retrieve freeze-frame and live data; confirm P1300 and check related P03xx codes to see if specific cylinders are identified.
- Clear codes, then perform a controlled road or loaded test while monitoring misfire counters and fuel/sensor data to reproduce the misfire.
- Inspect spark plugs and ignition coils on cylinders showing highest misfire counts; replace any plug or coil showing wear or failure.
- Swap ignition coil or injector between affected and known-good cylinder(s). If misfire follows the component, replace it.
- Measure fuel rail pressure and inspect fuel supply (pump, filter, regulator). Repair if pressure is out of specification.
- Perform injector tests (balance, current draw, spray pattern) and clean or replace clogged injectors.
- Check for intake vacuum leaks (smoke test), leaking intake manifold gaskets, or disconnected hoses; repair as needed.
- Test MAF/MAP and related sensors; clean MAF if contaminated, replace if out of spec. Verify fuel trims return to normal.
- If electrical faults suspected, inspect wiring harness, connectors, and grounds for intermittent faults; repair splices or corroded connectors.
- If misfire persists after ignition/fuel/sensor checks, perform compression and/or leak-down test to evaluate mechanical condition.
- After repair, clear codes and perform verification drive to ensure misfire no longer occurs and that fuel trims and O2 sensors behave normally.
Likely causes
- Worn or fouled spark plugs or failing coils
- Intermittent injector operation or clogged injector(s)
- Vacuum leak or intake leak causing lean condition
- Low fuel pressure or weak fuel pump
- Faulty MAF or MAP sensor skewing fuel delivery
- Intermittent wiring/connectors at coils/injectors or grounds
Fault status
Status
Random/multiple cylinder misfire detected — intermittent combustion misfire events recorded across one or more cylinders.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
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Code
P1300
VOLKSWAGEN
P — Powertrain
Misfire Detected Fuel Level Too Low
Views:
UK: 24
EN: 41
RU: 36
AI status
Completed
Completed
100%
Causes
- Worn or fouled spark plugs
- Failing ignition coils or coil-on-plug components
- Fuel injector failure, clogging, or poor spray pattern
- Low fuel pressure (weak pump, clogged filter, regulator fault)
- Vacuum leaks or intake manifold gasket leaks
- Faulty mass air flow (MAF) or MAP sensor
Symptoms
- Check Engine Light (MIL) illuminated
- Rough idle or intermittent surging
- Reduced engine power or hesitation under load
- Poor fuel economy and increased emissions
- Occasional engine stumble or bucking
- Misfire detected in freeze frame or misfire counters
What to check
- Read stored/active DTCs and freeze-frame data; note rpm, load, temperature when misfire occurred
- Monitor live data: misfire counts per cylinder, long/short term fuel trim, fuel trims, MAF/MAP, O2 sensor voltages
- Scan for related codes (P0300–P0308 and sensor/fuel trim codes)
- Inspect spark plugs for wear, fouling, or oil contamination; check gap
- Test ignition coils (primary/secondary resistance, swap coil to see if misfire follows)
- Inspect wiring and connectors for coils and injectors; check grounds
Signal parameters
- Cylinder misfire counts (per-cylinder misfire counter)
- Crankshaft position sensor signal (timing/consistency)
- Camshaft position sensor signal
- Fuel rail pressure (psi or kPa)
- Injector pulse width (ms) and duty cycle
- Ignition coil primary and secondary resistance (ohms)
Diagnostic algorithm
- Retrieve freeze-frame and live data; confirm P1300 and check related P03xx codes to see if specific cylinders are identified.
- Clear codes, then perform a controlled road or loaded test while monitoring misfire counters and fuel/sensor data to reproduce the misfire.
- Inspect spark plugs and ignition coils on cylinders showing highest misfire counts; replace any plug or coil showing wear or failure.
- Swap ignition coil or injector between affected and known-good cylinder(s). If misfire follows the component, replace it.
- Measure fuel rail pressure and inspect fuel supply (pump, filter, regulator). Repair if pressure is out of specification.
- Perform injector tests (balance, current draw, spray pattern) and clean or replace clogged injectors.
- Check for intake vacuum leaks (smoke test), leaking intake manifold gaskets, or disconnected hoses; repair as needed.
- Test MAF/MAP and related sensors; clean MAF if contaminated, replace if out of spec. Verify fuel trims return to normal.
- If electrical faults suspected, inspect wiring harness, connectors, and grounds for intermittent faults; repair splices or corroded connectors.
- If misfire persists after ignition/fuel/sensor checks, perform compression and/or leak-down test to evaluate mechanical condition.
- After repair, clear codes and perform verification drive to ensure misfire no longer occurs and that fuel trims and O2 sensors behave normally.
Likely causes
- Worn or fouled spark plugs or failing coils
- Intermittent injector operation or clogged injector(s)
- Vacuum leak or intake leak causing lean condition
- Low fuel pressure or weak fuel pump
- Faulty MAF or MAP sensor skewing fuel delivery
- Intermittent wiring/connectors at coils/injectors or grounds
Fault status
Status
Random/multiple cylinder misfire detected — intermittent combustion misfire events recorded across one or more cylinders.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
Similar codes
Your experience will help others
+100 karma for a short comment :)
Was this AI description helpful?
Your feedback helps improve AI descriptions.
👍 Like
0
👎 Dislike
0
Send to email