Code
P0308
Generic
P — Powertrain
Cylinder 8 Misfire Detected
Views:
UK: 24
EN: 39
RU: 45
AI status
Completed
Completed
100%
Causes
- Faulty spark plug on cylinder 8
- Bad or intermittent ignition coil or igniter for cylinder 8
- Faulty or clogged fuel injector for cylinder 8
- Low compression in cylinder 8 (worn rings, valve issues, head gasket)
- Vacuum leak or intake leak affecting cylinder 8
- Wiring or connector fault to injector or coil on cylinder 8
Symptoms
- Check Engine Light illuminated (may be flashing if severe)
- Rough idle or pronounced shake at idle
- Reduced engine power and hesitation under load
- Poor fuel economy and increased emissions
- Possible misfire felt during acceleration or at specific RPM ranges
- Unusual exhaust smell or noise; potential catalytic converter overheating if prolonged
What to check
- Read freeze frame and live data with a scan tool; confirm misfire count and conditions
- Check for other stored codes (fuel trims, cam/crank sensors, fuel pressure)
- Visually inspect spark plug, ignition coil, and wiring for cylinder 8
- Inspect injector connector and wiring for damage or corrosion
- Check fuel rail pressure and look for contamination or debris
- Listen for intake vacuum leaks near cylinder 8 intake runner
Signal parameters
- Ignition coil primary waveform: square-wave duty and voltage (~0–12 V primary switching)
- Ignition coil secondary: high-voltage spark event measured in kV (visible on ignition scope)
- Injector pulse width (ms) and frequency from PCM command on cylinder 8
- Fuel rail pressure (psi or bar) and fuel trim values (short-term and long-term)
- Crank/Cam sensor waveform: consistent phase and frequency (RPM-related)
- Cylinder pressure (psi) during compression test or leak-down percentage
Diagnostic algorithm
- Connect a capable scan tool and retrieve stored and pending codes; note freeze-frame (engine load, RPM, temp).
- Monitor live data: misfire counters, fuel trims, O2 sensor activity, injector duty, and ignition timing while reproducing the issue.
- Perform a visual inspection: spark plug condition, coil boot, wiring harness, connectors, and fuel injector connector for cylinder 8.
- Swap the ignition coil with another cylinder and re-check: if misfire follows the coil, replace coil. Record results.
- Swap the fuel injector with another cylinder (or use a noid light) to check injector operation; if misfire follows injector, replace injector.
- Measure fuel rail pressure under load and at idle to ensure correct pressure and no starvation.
- Perform a compression test and/or leak-down test on cylinder 8. Compare readings to adjacent cylinders and the manufacturer's spec.
- If compression is low, inspect for valve issues, head gasket failure, or piston/ring wear; consider cylinder leak-down diagnosis and repair.
- If ignition and fuel are good and compression is normal, inspect cam/crank sensor signals and timing chain/belt condition for timing-related misfire.
- If electrical intermittency is suspected, back-probe connectors and wiggle harness while monitoring live data for changes.
- Replace failed components as indicated (plug, coil, injector, harness repair). Clear codes and road test to confirm repair. If misfire persists, consider ECU/PCM tests or specialist engine diagnosis.
- Observe safety: avoid live high-voltage ignition components while engine running; use insulated tools and follow shop safety protocols.
Likely causes
- Worn or fouled spark plug on cylinder 8
- Failed ignition coil or coil pack for cylinder 8
- Clogged or failed injector on cylinder 8
- Low static or dynamic compression on cylinder 8
- Damaged wiring or poor connector contact to coil/injector
Fault status
Status
P0308 — Cylinder 8 Misfire Detected. The PCM has identified cylinder 8 firing inconsistently. Continued driving with an active misfire can damage the catalytic converter and drivetrain components; diagnose promptly.
Repair difficulty: Medium
Diagnostic time: 0.5-4 hours
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Code
P0308
GWM
P — Powertrain
- The order of ignition 8 cylinder is broken
Views:
UK: 2
EN: 3
RU: 3
AI status
Completed
Completed
100%
Causes
- Faulty spark plug on cylinder 8
- Bad or intermittent ignition coil or igniter for cylinder 8
- Faulty or clogged fuel injector for cylinder 8
- Low compression in cylinder 8 (worn rings, valve issues, head gasket)
- Vacuum leak or intake leak affecting cylinder 8
- Wiring or connector fault to injector or coil on cylinder 8
Symptoms
- Check Engine Light illuminated (may be flashing if severe)
- Rough idle or pronounced shake at idle
- Reduced engine power and hesitation under load
- Poor fuel economy and increased emissions
- Possible misfire felt during acceleration or at specific RPM ranges
- Unusual exhaust smell or noise; potential catalytic converter overheating if prolonged
What to check
- Read freeze frame and live data with a scan tool; confirm misfire count and conditions
- Check for other stored codes (fuel trims, cam/crank sensors, fuel pressure)
- Visually inspect spark plug, ignition coil, and wiring for cylinder 8
- Inspect injector connector and wiring for damage or corrosion
- Check fuel rail pressure and look for contamination or debris
- Listen for intake vacuum leaks near cylinder 8 intake runner
Signal parameters
- Ignition coil primary waveform: square-wave duty and voltage (~0–12 V primary switching)
- Ignition coil secondary: high-voltage spark event measured in kV (visible on ignition scope)
- Injector pulse width (ms) and frequency from PCM command on cylinder 8
- Fuel rail pressure (psi or bar) and fuel trim values (short-term and long-term)
- Crank/Cam sensor waveform: consistent phase and frequency (RPM-related)
- Cylinder pressure (psi) during compression test or leak-down percentage
Diagnostic algorithm
- Connect a capable scan tool and retrieve stored and pending codes; note freeze-frame (engine load, RPM, temp).
- Monitor live data: misfire counters, fuel trims, O2 sensor activity, injector duty, and ignition timing while reproducing the issue.
- Perform a visual inspection: spark plug condition, coil boot, wiring harness, connectors, and fuel injector connector for cylinder 8.
- Swap the ignition coil with another cylinder and re-check: if misfire follows the coil, replace coil. Record results.
- Swap the fuel injector with another cylinder (or use a noid light) to check injector operation; if misfire follows injector, replace injector.
- Measure fuel rail pressure under load and at idle to ensure correct pressure and no starvation.
- Perform a compression test and/or leak-down test on cylinder 8. Compare readings to adjacent cylinders and the manufacturer's spec.
- If compression is low, inspect for valve issues, head gasket failure, or piston/ring wear; consider cylinder leak-down diagnosis and repair.
- If ignition and fuel are good and compression is normal, inspect cam/crank sensor signals and timing chain/belt condition for timing-related misfire.
- If electrical intermittency is suspected, back-probe connectors and wiggle harness while monitoring live data for changes.
- Replace failed components as indicated (plug, coil, injector, harness repair). Clear codes and road test to confirm repair. If misfire persists, consider ECU/PCM tests or specialist engine diagnosis.
- Observe safety: avoid live high-voltage ignition components while engine running; use insulated tools and follow shop safety protocols.
Likely causes
- Worn or fouled spark plug on cylinder 8
- Failed ignition coil or coil pack for cylinder 8
- Clogged or failed injector on cylinder 8
- Low static or dynamic compression on cylinder 8
- Damaged wiring or poor connector contact to coil/injector
Fault status
Status
P0308 — Cylinder 8 Misfire Detected. The PCM has identified cylinder 8 firing inconsistently. Continued driving with an active misfire can damage the catalytic converter and drivetrain components; diagnose promptly.
Repair difficulty: Medium
Diagnostic time: 0.5-4 hours
Similar codes
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Code
P0308
HUMMER
P — Powertrain
Cylinder 8 Misfire Detected
Views:
UK: 11
EN: 23
RU: 19
AI status
Completed
Completed
100%
Causes
- Faulty spark plug on cylinder 8
- Bad or intermittent ignition coil or igniter for cylinder 8
- Faulty or clogged fuel injector for cylinder 8
- Low compression in cylinder 8 (worn rings, valve issues, head gasket)
- Vacuum leak or intake leak affecting cylinder 8
- Wiring or connector fault to injector or coil on cylinder 8
Symptoms
- Check Engine Light illuminated (may be flashing if severe)
- Rough idle or pronounced shake at idle
- Reduced engine power and hesitation under load
- Poor fuel economy and increased emissions
- Possible misfire felt during acceleration or at specific RPM ranges
- Unusual exhaust smell or noise; potential catalytic converter overheating if prolonged
What to check
- Read freeze frame and live data with a scan tool; confirm misfire count and conditions
- Check for other stored codes (fuel trims, cam/crank sensors, fuel pressure)
- Visually inspect spark plug, ignition coil, and wiring for cylinder 8
- Inspect injector connector and wiring for damage or corrosion
- Check fuel rail pressure and look for contamination or debris
- Listen for intake vacuum leaks near cylinder 8 intake runner
Signal parameters
- Ignition coil primary waveform: square-wave duty and voltage (~0–12 V primary switching)
- Ignition coil secondary: high-voltage spark event measured in kV (visible on ignition scope)
- Injector pulse width (ms) and frequency from PCM command on cylinder 8
- Fuel rail pressure (psi or bar) and fuel trim values (short-term and long-term)
- Crank/Cam sensor waveform: consistent phase and frequency (RPM-related)
- Cylinder pressure (psi) during compression test or leak-down percentage
Diagnostic algorithm
- Connect a capable scan tool and retrieve stored and pending codes; note freeze-frame (engine load, RPM, temp).
- Monitor live data: misfire counters, fuel trims, O2 sensor activity, injector duty, and ignition timing while reproducing the issue.
- Perform a visual inspection: spark plug condition, coil boot, wiring harness, connectors, and fuel injector connector for cylinder 8.
- Swap the ignition coil with another cylinder and re-check: if misfire follows the coil, replace coil. Record results.
- Swap the fuel injector with another cylinder (or use a noid light) to check injector operation; if misfire follows injector, replace injector.
- Measure fuel rail pressure under load and at idle to ensure correct pressure and no starvation.
- Perform a compression test and/or leak-down test on cylinder 8. Compare readings to adjacent cylinders and the manufacturer's spec.
- If compression is low, inspect for valve issues, head gasket failure, or piston/ring wear; consider cylinder leak-down diagnosis and repair.
- If ignition and fuel are good and compression is normal, inspect cam/crank sensor signals and timing chain/belt condition for timing-related misfire.
- If electrical intermittency is suspected, back-probe connectors and wiggle harness while monitoring live data for changes.
- Replace failed components as indicated (plug, coil, injector, harness repair). Clear codes and road test to confirm repair. If misfire persists, consider ECU/PCM tests or specialist engine diagnosis.
- Observe safety: avoid live high-voltage ignition components while engine running; use insulated tools and follow shop safety protocols.
Likely causes
- Worn or fouled spark plug on cylinder 8
- Failed ignition coil or coil pack for cylinder 8
- Clogged or failed injector on cylinder 8
- Low static or dynamic compression on cylinder 8
- Damaged wiring or poor connector contact to coil/injector
Fault status
Status
P0308 — Cylinder 8 Misfire Detected. The PCM has identified cylinder 8 firing inconsistently. Continued driving with an active misfire can damage the catalytic converter and drivetrain components; diagnose promptly.
Repair difficulty: Medium
Diagnostic time: 0.5-4 hours
Similar codes
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Code
P0308
MITSUBISHI
P — Powertrain
No.8 cylinder misfire detected
Views:
UK: 10
EN: 17
RU: 17
AI status
Completed
Completed
100%
Causes
- Faulty spark plug on cylinder 8
- Bad or intermittent ignition coil or igniter for cylinder 8
- Faulty or clogged fuel injector for cylinder 8
- Low compression in cylinder 8 (worn rings, valve issues, head gasket)
- Vacuum leak or intake leak affecting cylinder 8
- Wiring or connector fault to injector or coil on cylinder 8
Symptoms
- Check Engine Light illuminated (may be flashing if severe)
- Rough idle or pronounced shake at idle
- Reduced engine power and hesitation under load
- Poor fuel economy and increased emissions
- Possible misfire felt during acceleration or at specific RPM ranges
- Unusual exhaust smell or noise; potential catalytic converter overheating if prolonged
What to check
- Read freeze frame and live data with a scan tool; confirm misfire count and conditions
- Check for other stored codes (fuel trims, cam/crank sensors, fuel pressure)
- Visually inspect spark plug, ignition coil, and wiring for cylinder 8
- Inspect injector connector and wiring for damage or corrosion
- Check fuel rail pressure and look for contamination or debris
- Listen for intake vacuum leaks near cylinder 8 intake runner
Signal parameters
- Ignition coil primary waveform: square-wave duty and voltage (~0–12 V primary switching)
- Ignition coil secondary: high-voltage spark event measured in kV (visible on ignition scope)
- Injector pulse width (ms) and frequency from PCM command on cylinder 8
- Fuel rail pressure (psi or bar) and fuel trim values (short-term and long-term)
- Crank/Cam sensor waveform: consistent phase and frequency (RPM-related)
- Cylinder pressure (psi) during compression test or leak-down percentage
Diagnostic algorithm
- Connect a capable scan tool and retrieve stored and pending codes; note freeze-frame (engine load, RPM, temp).
- Monitor live data: misfire counters, fuel trims, O2 sensor activity, injector duty, and ignition timing while reproducing the issue.
- Perform a visual inspection: spark plug condition, coil boot, wiring harness, connectors, and fuel injector connector for cylinder 8.
- Swap the ignition coil with another cylinder and re-check: if misfire follows the coil, replace coil. Record results.
- Swap the fuel injector with another cylinder (or use a noid light) to check injector operation; if misfire follows injector, replace injector.
- Measure fuel rail pressure under load and at idle to ensure correct pressure and no starvation.
- Perform a compression test and/or leak-down test on cylinder 8. Compare readings to adjacent cylinders and the manufacturer's spec.
- If compression is low, inspect for valve issues, head gasket failure, or piston/ring wear; consider cylinder leak-down diagnosis and repair.
- If ignition and fuel are good and compression is normal, inspect cam/crank sensor signals and timing chain/belt condition for timing-related misfire.
- If electrical intermittency is suspected, back-probe connectors and wiggle harness while monitoring live data for changes.
- Replace failed components as indicated (plug, coil, injector, harness repair). Clear codes and road test to confirm repair. If misfire persists, consider ECU/PCM tests or specialist engine diagnosis.
- Observe safety: avoid live high-voltage ignition components while engine running; use insulated tools and follow shop safety protocols.
Likely causes
- Worn or fouled spark plug on cylinder 8
- Failed ignition coil or coil pack for cylinder 8
- Clogged or failed injector on cylinder 8
- Low static or dynamic compression on cylinder 8
- Damaged wiring or poor connector contact to coil/injector
Fault status
Status
P0308 — Cylinder 8 Misfire Detected. The PCM has identified cylinder 8 firing inconsistently. Continued driving with an active misfire can damage the catalytic converter and drivetrain components; diagnose promptly.
Repair difficulty: Medium
Diagnostic time: 0.5-4 hours
Similar codes
Your experience will help others
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Was this AI description helpful?
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