Toggle Side Panel

Shopping Cart

No products in the basket.

Shopping Cart

No products in the basket.

Close search
Home / DTC / P0307 — Cylinder 7 Misfire Detected

P0307 — Cylinder 7 Misfire Detected

Detailed page for trouble code P0307.

34,405codes
59brands
11,914generic
22,491specific
All codes P-codes (Powertrain) B-codes (Body) C-codes (Chassis) U-codes (Network/User) Tesla Alerts
Reset
Code

P0307

Generic P — Powertrain

Cylinder 7 Misfire Detected

Brand: Generic
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty or fouled spark plug in cylinder 7
  • Failed or weak ignition coil (coil-on-plug) for cylinder 7
  • Clogged or failed fuel injector on cylinder 7
  • Low cylinder compression (worn piston rings, burned valve, head gasket)
  • Intake manifold vacuum leak or intake gasket leak near cylinder 7
  • Low fuel pressure or weak fuel pump

Symptoms

  • Check engine light (MIL) illuminated
  • Rough idle or vibration at idle
  • Loss of power and hesitation under load
  • Reduced fuel economy
  • Increased exhaust emissions and possible rotten-egg smell if catalytic affected
  • Occasional hard starting or stalling

What to check

  • Read and record all stored/PENDING codes and freeze-frame data with a scan tool
  • Check misfire counts and identify whether misfire is isolated to cylinder 7 or intermittent
  • Visual inspection: wiring, connectors, coil-on-plug boots, and spark plug for cylinder 7
  • Swap ignition coil from cylinder 7 with a known-good cylinder to see if misfire follows the coil
  • Swap fuel injector (or swap injector harness/connector) with another cylinder to see if misfire follows the injector
  • Check fuel rail pressure with a gauge to confirm system pressure within spec

Signal parameters

  • Misfire count for cylinder 7 (events/cycle or per minute)
  • Short-term fuel trim (STFT) and long-term fuel trim (LTFT) (%)—look for large corrections on the affected bank
  • Injector pulse width (ms) for cylinder 7
  • Ignition coil primary resistance (ohms) and secondary resistance (kΩ) or coil dwell time (ms)
  • Fuel rail pressure (psi / bar) at idle and under load
  • Crankshaft/Camshaft position sensor signals and cam/crank correlation (timing)

Diagnostic algorithm

  1. Read and record all DTCs and freeze-frame data; note operating conditions when P0307 set.
  2. Confirm misfire is current: monitor live misfire counters and identify if it's steady, intermittent, or load-dependent.
  3. Perform visual inspection of spark plug, coil, boot and wiring for cylinder 7; replace or re-seat if damaged.
  4. Swap the ignition coil from cylinder 7 with a known-good cylinder. If misfire moves, replace the coil.
  5. If coil swap is negative, swap the injector (or its connector) with another cylinder. If misfire follows, replace the injector.
  6. Check fuel rail pressure and ensure regulator and pump are within spec; inspect fuel filter if applicable.

Likely causes

  • Worn, fouled or incorrectly gapped spark plug in cylinder 7
  • Failed ignition coil for cylinder 7 (common on coil-on-plug systems)
  • Stuck/failed fuel injector or poor injector spray pattern for cylinder 7
  • Low compression on cylinder 7 (mechanical issue)
  • Damaged wiring or loose connector to coil/injector on cylinder 7

Fault status

⚠️ Status
Engine control detected a misfire specific to cylinder 7. MIL set; increased emissions risk and potential catalytic converter damage if unresolved. Further testing required to identify cause (ignition, fuel, mechanical, or wiring).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours
7,912

The library contains 7,912 repair and diagnostic manuals. Choose a brand to open the full manual tree by year, model and trim.

ALFA ROMEO
89
AUDI
1,160
BMW
479
CHEVROLET
230
DAEWOO
75
FIAT
26
GENESIS
207
HUMMER
138
HYUNDAI
371
ISUZU
86
LAND ROVER
320
LEXUS
280
LINCOLN
166
MERCEDES-BENZ
856
MERCURY
296
MITSUBISHI
406
PORSCHE
136
TESLA
58
TOYOTA
2,042
TRIUMPH
131
VOLKSWAGEN
139
VOLVO
221
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P0307

GWM P — Powertrain

- Ignition order of cylinder 7 disrupted

Brand: GWM
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty or fouled spark plug in cylinder 7
  • Failed or weak ignition coil (coil-on-plug) for cylinder 7
  • Clogged or failed fuel injector on cylinder 7
  • Low cylinder compression (worn piston rings, burned valve, head gasket)
  • Intake manifold vacuum leak or intake gasket leak near cylinder 7
  • Low fuel pressure or weak fuel pump

Symptoms

  • Check engine light (MIL) illuminated
  • Rough idle or vibration at idle
  • Loss of power and hesitation under load
  • Reduced fuel economy
  • Increased exhaust emissions and possible rotten-egg smell if catalytic affected
  • Occasional hard starting or stalling

What to check

  • Read and record all stored/PENDING codes and freeze-frame data with a scan tool
  • Check misfire counts and identify whether misfire is isolated to cylinder 7 or intermittent
  • Visual inspection: wiring, connectors, coil-on-plug boots, and spark plug for cylinder 7
  • Swap ignition coil from cylinder 7 with a known-good cylinder to see if misfire follows the coil
  • Swap fuel injector (or swap injector harness/connector) with another cylinder to see if misfire follows the injector
  • Check fuel rail pressure with a gauge to confirm system pressure within spec

Signal parameters

  • Misfire count for cylinder 7 (events/cycle or per minute)
  • Short-term fuel trim (STFT) and long-term fuel trim (LTFT) (%)—look for large corrections on the affected bank
  • Injector pulse width (ms) for cylinder 7
  • Ignition coil primary resistance (ohms) and secondary resistance (kΩ) or coil dwell time (ms)
  • Fuel rail pressure (psi / bar) at idle and under load
  • Crankshaft/Camshaft position sensor signals and cam/crank correlation (timing)

Diagnostic algorithm

  1. Read and record all DTCs and freeze-frame data; note operating conditions when P0307 set.
  2. Confirm misfire is current: monitor live misfire counters and identify if it's steady, intermittent, or load-dependent.
  3. Perform visual inspection of spark plug, coil, boot and wiring for cylinder 7; replace or re-seat if damaged.
  4. Swap the ignition coil from cylinder 7 with a known-good cylinder. If misfire moves, replace the coil.
  5. If coil swap is negative, swap the injector (or its connector) with another cylinder. If misfire follows, replace the injector.
  6. Check fuel rail pressure and ensure regulator and pump are within spec; inspect fuel filter if applicable.

Likely causes

  • Worn, fouled or incorrectly gapped spark plug in cylinder 7
  • Failed ignition coil for cylinder 7 (common on coil-on-plug systems)
  • Stuck/failed fuel injector or poor injector spray pattern for cylinder 7
  • Low compression on cylinder 7 (mechanical issue)
  • Damaged wiring or loose connector to coil/injector on cylinder 7

Fault status

⚠️ Status
Engine control detected a misfire specific to cylinder 7. MIL set; increased emissions risk and potential catalytic converter damage if unresolved. Further testing required to identify cause (ignition, fuel, mechanical, or wiring).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours
Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email
Code

P0307

HUMMER P — Powertrain

Cylinder 7 Misfire Detected

Brand: HUMMER
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty or fouled spark plug in cylinder 7
  • Failed or weak ignition coil (coil-on-plug) for cylinder 7
  • Clogged or failed fuel injector on cylinder 7
  • Low cylinder compression (worn piston rings, burned valve, head gasket)
  • Intake manifold vacuum leak or intake gasket leak near cylinder 7
  • Low fuel pressure or weak fuel pump

Symptoms

  • Check engine light (MIL) illuminated
  • Rough idle or vibration at idle
  • Loss of power and hesitation under load
  • Reduced fuel economy
  • Increased exhaust emissions and possible rotten-egg smell if catalytic affected
  • Occasional hard starting or stalling

What to check

  • Read and record all stored/PENDING codes and freeze-frame data with a scan tool
  • Check misfire counts and identify whether misfire is isolated to cylinder 7 or intermittent
  • Visual inspection: wiring, connectors, coil-on-plug boots, and spark plug for cylinder 7
  • Swap ignition coil from cylinder 7 with a known-good cylinder to see if misfire follows the coil
  • Swap fuel injector (or swap injector harness/connector) with another cylinder to see if misfire follows the injector
  • Check fuel rail pressure with a gauge to confirm system pressure within spec

Signal parameters

  • Misfire count for cylinder 7 (events/cycle or per minute)
  • Short-term fuel trim (STFT) and long-term fuel trim (LTFT) (%)—look for large corrections on the affected bank
  • Injector pulse width (ms) for cylinder 7
  • Ignition coil primary resistance (ohms) and secondary resistance (kΩ) or coil dwell time (ms)
  • Fuel rail pressure (psi / bar) at idle and under load
  • Crankshaft/Camshaft position sensor signals and cam/crank correlation (timing)

Diagnostic algorithm

  1. Read and record all DTCs and freeze-frame data; note operating conditions when P0307 set.
  2. Confirm misfire is current: monitor live misfire counters and identify if it's steady, intermittent, or load-dependent.
  3. Perform visual inspection of spark plug, coil, boot and wiring for cylinder 7; replace or re-seat if damaged.
  4. Swap the ignition coil from cylinder 7 with a known-good cylinder. If misfire moves, replace the coil.
  5. If coil swap is negative, swap the injector (or its connector) with another cylinder. If misfire follows, replace the injector.
  6. Check fuel rail pressure and ensure regulator and pump are within spec; inspect fuel filter if applicable.

Likely causes

  • Worn, fouled or incorrectly gapped spark plug in cylinder 7
  • Failed ignition coil for cylinder 7 (common on coil-on-plug systems)
  • Stuck/failed fuel injector or poor injector spray pattern for cylinder 7
  • Low compression on cylinder 7 (mechanical issue)
  • Damaged wiring or loose connector to coil/injector on cylinder 7

Fault status

⚠️ Status
Engine control detected a misfire specific to cylinder 7. MIL set; increased emissions risk and potential catalytic converter damage if unresolved. Further testing required to identify cause (ignition, fuel, mechanical, or wiring).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours
Repair manuals

Manual library for HUMMER

138

Browse 138 HUMMER manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

HUMMER

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

P0307

MITSUBISHI P — Powertrain

No.7 cylinder misfire detected

Brand: MITSUBISHI
Type: P — Powertrain
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Faulty or fouled spark plug in cylinder 7
  • Failed or weak ignition coil (coil-on-plug) for cylinder 7
  • Clogged or failed fuel injector on cylinder 7
  • Low cylinder compression (worn piston rings, burned valve, head gasket)
  • Intake manifold vacuum leak or intake gasket leak near cylinder 7
  • Low fuel pressure or weak fuel pump

Symptoms

  • Check engine light (MIL) illuminated
  • Rough idle or vibration at idle
  • Loss of power and hesitation under load
  • Reduced fuel economy
  • Increased exhaust emissions and possible rotten-egg smell if catalytic affected
  • Occasional hard starting or stalling

What to check

  • Read and record all stored/PENDING codes and freeze-frame data with a scan tool
  • Check misfire counts and identify whether misfire is isolated to cylinder 7 or intermittent
  • Visual inspection: wiring, connectors, coil-on-plug boots, and spark plug for cylinder 7
  • Swap ignition coil from cylinder 7 with a known-good cylinder to see if misfire follows the coil
  • Swap fuel injector (or swap injector harness/connector) with another cylinder to see if misfire follows the injector
  • Check fuel rail pressure with a gauge to confirm system pressure within spec

Signal parameters

  • Misfire count for cylinder 7 (events/cycle or per minute)
  • Short-term fuel trim (STFT) and long-term fuel trim (LTFT) (%)—look for large corrections on the affected bank
  • Injector pulse width (ms) for cylinder 7
  • Ignition coil primary resistance (ohms) and secondary resistance (kΩ) or coil dwell time (ms)
  • Fuel rail pressure (psi / bar) at idle and under load
  • Crankshaft/Camshaft position sensor signals and cam/crank correlation (timing)

Diagnostic algorithm

  1. Read and record all DTCs and freeze-frame data; note operating conditions when P0307 set.
  2. Confirm misfire is current: monitor live misfire counters and identify if it's steady, intermittent, or load-dependent.
  3. Perform visual inspection of spark plug, coil, boot and wiring for cylinder 7; replace or re-seat if damaged.
  4. Swap the ignition coil from cylinder 7 with a known-good cylinder. If misfire moves, replace the coil.
  5. If coil swap is negative, swap the injector (or its connector) with another cylinder. If misfire follows, replace the injector.
  6. Check fuel rail pressure and ensure regulator and pump are within spec; inspect fuel filter if applicable.

Likely causes

  • Worn, fouled or incorrectly gapped spark plug in cylinder 7
  • Failed ignition coil for cylinder 7 (common on coil-on-plug systems)
  • Stuck/failed fuel injector or poor injector spray pattern for cylinder 7
  • Low compression on cylinder 7 (mechanical issue)
  • Damaged wiring or loose connector to coil/injector on cylinder 7

Fault status

⚠️ Status
Engine control detected a misfire specific to cylinder 7. MIL set; increased emissions risk and potential catalytic converter damage if unresolved. Further testing required to identify cause (ignition, fuel, mechanical, or wiring).
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours
406

Browse 406 MITSUBISHI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.

MITSUBISHI

Your experience will help others
+100 karma for a short comment :)
Keep it short and practical. Up to 500 characters.
Send to email

Report

Harassment or bullying behavior
Contains mature or sensitive content
Contains misleading or false information
Contains abusive or derogatory content
Contains spam, fake content or potential malware

Block Member?

Please confirm you want to block this member.

You will no longer be able to:

  • See blocked member's posts
  • Mention this member in posts
  • Invite this member to groups
  • Message this member
  • Add this member as a connection

Please note: This action will also remove this member from your connections and send a report to the site admin. Please allow a few minutes for this process to complete.

Report

You have already reported this .