Error code

OBD2 P0308

OBD2P0308
Diagnostic Trouble Code· Standard OBD-II fault code read from the vehicle's onboard diagnostics.

What it means

Cylinder 8 Misfire Detected.

Severity

moderateCan be driven but performance will suffer and it may cause additional engine damage if not addressed.

Summary

P0308 indicates that cylinder 8 is misfiring, which means it's not igniting properly as part of the engine's combustion cycle.

Symptoms

  • Vibrations at idle
  • Decreased engine performance and fuel economy

Common Causes

  • Faulty spark plug in cylinder 8
  • Defective ignition coil for cylinder 8
  • Wiring issues related to cylinder 8
  • Malfunctioning fuel injector in cylinder 8

Diagnosis

  1. Check for a technical service bulletin related to the specific issue.
  2. Swap ignition components between cylinder 8 and another cylinder to isolate the problem.
  3. Inspect compression issues, such as exhaust valve or head gasket leaks.

Fixes

  • Replace faulty spark plug in cylinder 8
  • Install a new ignition coil for cylinder 8

FAQ

What should I do if my car has P0308?

It's important to diagnose the specific cause of the misfire, such as checking the spark plug, ignition coil, wiring, or fuel injector in cylinder 8. Addressing these issues promptly can prevent further engine damage.

View source

Not affiliated with OBD2. Answer summarized from the manufacturer's manual linked above; consult that source for the authoritative procedure.

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