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TorqueMech OBD Code Guide

P0308 - Cylinder 8 Misfire Detected

The ECM detected a misfire on cylinder 8.

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Code Meaning

The ECM detected a misfire on cylinder 8.

Common Causes

Worn spark plug
Faulty ignition coil or plug wire
Injector issue
Compression/valve issue
Vacuum leak affecting that cylinder

Quick Checks

  • Swap coil to another cylinder and see if misfire follows
  • Inspect spark plug condition/gap
  • Check injector connector and fuel trim
  • Perform compression/leak-down if persistent
  • Check for intake/vacuum leak near that runner

Likely Repairs

Use test results to confirm the fault before pricing the repair.

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Related Codes

P0300
Random/Multiple Cylinder Misfire
Open ->
P0301
Cylinder 1 Misfire
Open ->
P0302
Cylinder 2 Misfire
Open ->
P0303
Cylinder 3 Misfire
Open ->
P0304
Cylinder 4 Misfire
Open ->
P0305
Cylinder 5 Misfire
Open ->
P0306
Cylinder 6 Misfire
Open ->
P0307
Cylinder 7 Misfire
Open ->

Next Steps

Move from the code to a diagnosis path, then into repair pricing once the fault is confirmed.

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