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2018 Challenger R/T Misfire and Check Engine Light - P0304 Code

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Paul Z. · rep 0 · May 22, 5:38 AM · 1 replies · solved · Question

Hey everyone, I'm having an issue with my 2018 Dodge Challenger R/T, 5.7L HEMI. The check engine light came on a few days ago, and I've noticed a slight rough idle and a definite loss of power, especially when accelerating.

I hooked up my OBD-II scanner and pulled a P0304 code, which indicates a misfire on cylinder 4. I'm wondering if this is a common issue for these Challengers and what the most likely culprits might be. I've heard everything from spark plugs to coil packs to fuel injectors.

Any advice on where to start troubleshooting? I'm hoping it's something I can tackle myself before taking it to a shop. Thanks in advance!

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 22, 5:38 AM

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ClearTheCode guidance (Dodge · Diagnostics & codes)

Summary: For 2018 Challenger R/T Misfire and Check Engine Light - P0304 Code, work through these steps on your 2016+ vehicle:

  1. Confirm the symptom — note when it happens (cold start, highway, after fuel fill, etc.).
  2. Scan codes — save all pending/stored DTCs; don't clear until you've recorded them.
  3. Check TSBs & recalls — look up your VIN for open campaigns and known fixes.
  4. Inspect the obvious — related fuses, connectors, fluid level, and recent repairs.
  5. Test the common fix — follow model-specific service procedures; one change at a time.
  6. Escalate if needed — burning smell, no brakes, overheating, or stalling in traffic → shop visit.

Owner reported: Hey everyone, I'm having an issue with my 2018 Dodge Challenger R/T, 5.7L HEMI. The check engine light came on a few days ago, and I've noticed a slight rough idle and a definite loss of power, especially when accelerating.

I hooked up my OBD-II scanner and pulled a P0304 code, which indicates a misfire on cylinder 4. I'm wondering if this is a common issue for these Challengers and what the most…

This is educational guidance, not a substitute for hands-on diagnosis.

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