P0301 Code: Dodge Charger (2021-2023) - Causes, Symptoms & Fixes

Diagnostic guide for P0301 on 2021-2023 Dodge Charger

Important data note

• Based on the provided NHTSA data for 2021-2023 Dodge Charger, there are no owner complaints and no official recalls listed for P0301 in this model/year range. No recalls found in NHTSA database. This guide relies on general automotive knowledge for P0301 diagnostics and applies it to the Charger platform, with the data limitations clearly acknowledged.

Code meaning and severity

• What P0301 means: P0301 is a misfire DTC indicating that the engine control module (ECM) detected a misfire in cylinder 1.
• Why misfires matter: A sustained misfire reduces engine power and efficiency, can cause rough idle, and over time can overheat and damage the catalytic converter, oxygen sensors, and other exhaust components. Prolonged misfires may lead to increased emissions, higher fuel consumption, and potential long-term engine damage.
• Situation awareness: In modern Chargers, cylinder 1 corresponds to the first cylinder on the engine bank as numbered by the manufacturer. Misfire can be intermittent or persistent and may occur under load, at idle, or during acceleration.

Common causes on Dodge Charger

Note: The Charger in the 2021–2023 era uses coil-on-plug ignition on each cylinder and multiple injectors, so cylinder-specific failures are often tied to the coil, plug, or injector in that cylinder (cylinder 1). The following are typical causes, listed from most common to less common in many modern engines:

• Ignition components for cylinder 1
  • Faulty ignition coil for cylinder 1 (coil-on-plug failure or internal coil short).
  • Worn or fouled spark plug for cylinder 1 (gap change, fouling, oil contamination).
  • Damaged or degraded spark plug boot/connector leading to weak spark.
• Fuel delivery and air mixture
  • Faulty or clogged fuel injector for cylinder 1.
  • Low or unstable fuel pressure affecting cylinder 1.
  • Contaminated fuel affecting atomization in cylinder 1.
• Air intake and vacuum
  • Vacuum leak or intake manifold gasket issue near cylinder 1.
  • Dirty/blocked mass airflow sensor (MAF) or fuel trim anomalies affecting cylinder 1 more than others.
• Compression and mechanical issues
  • Low compression in cylinder 1 due to worn rings, leaky valve, burned valve, or head gasket issue.
  • Timing problems (rare in modern engines but possible if a timing component failed).
• Electrical and sensor-related
  • Wiring harness or connector for cylinder 1 coil, plug, or injector damaged/loose.
  • PCM/ECM software anomaly (less common, but software-related misfire calibration can exist in some cycles).
• Miscellaneous
  • Dirty or degraded fuel injectors affecting spray pattern specifically in cylinder 1.
  • Oil intrusion into the spark plug well (oil fouling) in a cylinder if valve cover or seal is compromised, leading to misfire.

Symptoms you may notice with P0301

• MIL/Check Engine Light illuminated or flashing in some cases.
• Rough idle or engine shake at idle.
• Noticeable loss of power or hesitation during acceleration.
• Poor throttle response or stalling in some situations.
• Increased fuel consumption or reduced miles per gallon.
• Occasional misfire feel (pops, hiccups) especially under load.
• In persistent cases, exhaust odor of unburned fuel.

Diagnostic steps (practical, road-to-repair workflow)

Tools you may need:

• OBD-II scanner with live data and ability to read freeze-frame data
• Spark plug socket and torque wrench
• Differential spark plug and coil testers or a spark tester
• Basic hand tools for coil/plug access
• Fuel pressure gauge or access to a rugged fuel system test tool
• Compression tester and optionally a cylinder leakage tester
• Noid light or injector testing tool (optional)

Step-by-step approach

• Step 0: Confirm and contextualize

  • Read the stored DTCs and freeze-frame data. Confirm P0301 is current and note engine RPM, load, temperature, and road speed from freeze frame.
  • Check for related codes (P0300 for random/multiple misfires, P0351–P0354 for ignition coil circuit faults, P0302–P0308 for other cylinder misfires) to guide the diagnosis.

• Step 1: Visual inspection

  • Inspect the cylinder 1 ignition coil boot/connector for cracks, oil residue, corrosion, or loose connection.
  • Inspect the cylinder 1 spark plug (if accessible) for fouling, oil contamination, or heavy carbon buildup.
  • Check for obvious vacuum leaks around the intake manifold runner for cylinder 1.

• Step 2: Basic spark test and swap test

  • With the engine running, swap the ignition coil from cylinder 1 with a known-good coil from another cylinder (or vice versa) and observe if the misfire follows the coil. If P0301 moves to the other cylinder, the coil is suspect.
  • If coils appear ok, swap the spark plug from cylinder 1 with a plug from another cylinder (careful not to cross-thread). If the misfire follows the spark plug, the plug is suspect.

• Step 3: Fuel delivery check for cylinder 1

  • Swap the fuel injector for cylinder 1 with another cylinder’s injector and see if the misfire follows the injector. A moving misfire indicates an injector issue.
  • If you cannot perform a swap, perform an injector balance/seal check using appropriate diagnostic tools. Look for signs of an injector leak or poor spray pattern.

• Step 4: Sensor and data checks

  • Check live data for ignition primary/secondary waveforms, misfire counters, fuel trim (short-term/long-term) and fuel pressure.
  • Look for unusually high or erratic trim values that would indicate an air/fuel mix problem on that cylinder.

• Step 5: Compression and mechanical checks

  • Perform a compression test on cylinder 1 and compare with adjacent cylinders. Low compression on cylinder 1 indicates mechanical issues (valve, seating, ring, or gasket problems).
  • If compression is low, perform a wet compression test (add a small amount of oil into the cylinder and re-test) to differentiate between rings vs valve seating.

• Step 6: Vacuum and intake integrity

  • If compression is normal, re-check for vacuum leaks specifically around the intake manifold that could affect cylinder 1 (including PCV lines and gasket integrity).

• Step 7: Decide on repair path

  • If misfire follows plug/coil, replace the faulty component and re-test.
  • If misfire follows injector, replace injector or perform cleaning as needed.
  • If compression is low, plan mechanical repair.
  • If all above checks are nominal but misfire persists, re-check wiring harnesses and consider PCM/software updates as a last step.

• Step 8: Clear and verify

  • After repairs, clear the codes and run a controlled test drive to verify the misfire does not return. Monitor live data to ensure misfire counters are zero or stable.

Notes

• Misfires can cause catalytic converter damage if left unresolved. Avoid aggressive driving with a potential misfire.
• In some cases, multiple codes can appear (P0300 plus P0301, etc.). Prioritize fixed cylinder 1 misfire to restore overall engine health.

Related codes

• P0300: Random/multiple cylinder misfire detected
• P0302–P0308: Misfire in cylinders 2–8 (depending on engine configuration)
• P0351–P0354: Ignition coil primary/secondary circuit faults for respective cylinders
• P0171 or P0174: System too lean or rich (line-of-diagnosis indicators that can accompany misfires)
• P1351, P1352, etc.: Ignition system-related codes that may co-occur in some setups
  Note: The exact set of related codes can vary by vehicle configuration and software level. Use the scan data to guide the correlation.

Repair options and costs (2025 price estimates)

Important: These are typical ranges for the U.S. market and may vary by region, vehicle trim (V6 vs V8, engine access), shop rate, and parts choice (OEM vs aftermarket). They reflect common scenarios for a single-cylinder P0301 misfire in a 2021–2023 Charger.

• Quick fix (cylinder 1 coil or spark plug swap replacement)

  • Parts: spark plug for cylinder 1 ($5–$25) and/or ignition coil for cylinder 1 ($40–$120)
  • Labor: 0.5–1.5 hours
  • Estimated total: roughly $100–$300 if only cylinder 1 plug/coil is replaced; more if additional parts are needed

• Full spark plug and ignition coil replacement for all cylinders (typical preventive approach)

  • Parts: 6 spark plugs ($30–$120 total, depending on brand) + 6 ignition coils ($240–$720 total)
  • Labor: 2.0–4.0 hours (depending on engine access and whether all coils/plugs are done at once)
  • Estimated total: roughly $700–$1500 (parts plus labor)

• Fuel injector replacement or servicing for cylinder 1

  • Parts: injector ($100–$300) plus seals
  • Labor: 0.5–1.5 hours
  • Estimated total: roughly $250–$600

• Vacuum/ intake gasket or leak repair near cylinder 1

  • Parts: gasket/seals ($20–$150) plus related hoses
  • Labor: 1.0–3.0 hours
  • Estimated total: roughly $200–$700

• Compression/engine mechanical issues (valve, rings, head gasket)

  • Parts: gaskets/o-rings, possible timing components if involved
  • Labor: 4.0–12.0+ hours depending on complexity
  • Estimated total: roughly $800–$3500+

• Software/ECU update or reflash

  • Parts: none (software update)
  • Labor: 0.5–1.5 hours
  • Estimated total: roughly $50–$150 (if charged as diagnostic time) to $0–$150 in some cases if included in a service program

• Diagnostic fees

  • Flat diagnostic fee or hourly rate varies by region
  • Estimated diagnostic fee: $80–$150 (some shops may waive if you proceed with recommended repairs)

Notes on cost expectations

• Addressing P0301 promptly is wise to avoid catalytic converter damage and further engine wear.
• If you replace only the plug or coil and the misfire persists, the next-step components (injector, compression) may be required, which changes the cost.
• Always request a written estimate before major repairs and ask for a parts/spec comparison (OEM vs. aftermarket).

DIY vs professional

• DIY feasibility:
  • Plug and coil swaps on many Dodge Chargers can be done by a capable DIYer with basic tools, safety gear, and a torque wrench. Access to the coil-on-plug pack may be straightforward on some engines, more challenging on others depending on engine layout and air intake components.
  • DIY spark plug changes are common; ignition coil tests and injector swaps require caution and proper tools.
  • Pros: lower cost, quick validation, good learning experience.
  • Cons: risk of cross-threading, incorrect torque, incorrect wiring, or missing a root cause (e.g., failing injector or compression issue). If you’re not comfortable diagnosing misfires across ignition, fuel, and compression systems, consider a professional.
• Professional considerations:
  • Pros: comprehensive diagnostics, proper fuel-pressure testing, precise compression/test procedures, access to advanced tools, quick identification of mechanical issues.
  • Cons: higher upfront cost, but often reduces the risk of missing a root cause.
• When to see a pro:
  • If you’re not able to reliably reproduce the misfire or interpret live data.
  • If you’re seeing elevated exhaust temperatures, smoke, or you suspect compression/valve issues.
  • If the misfire persists after replacing the obvious ignition components (plug/coil) or if you’re uncomfortable with fuel system testing.

Prevention

• Regular maintenance aligned with factory recommendations
  • Replace spark plugs at the manufacturer’s recommended interval with the correct platinum/iridium grade and gap specification.
  • Replace ignition coils only when diagnosing failure or when indicated by test results; avoid unnecessary coil replacements.
• Fuel system care
  • Use high-quality fuel and a reputable detergent additive if recommended by the vehicle manufacturer.
  • Periodically use a fuel system cleaner that targets injectors and intake valves, especially if the vehicle has extended idle periods or infrequent driving.
• Air intake health
  • Keep intake paths clean; replace dirty air filters on schedule.
  • Inspect vacuum hoses and PCV lines for cracks or leaks; replace as needed.
• Emissions and exhaust care
  • Address misfires promptly to prevent catalytic converter damage; a failed converter can quickly increase repair costs.
• Electrical system
  • Inspect wiring harnesses for wear, especially around coil packs and injectors; secure connections to prevent intermittent misfires.
• Driving habits
  • Regular driving that includes some highway miles helps keep injectors and valves clean and reduces valve deposits that can contribute to misfires.

Summary

• P0301 on a 2021–2023 Dodge Charger indicates a cylinder 1 misfire detected by the ECM. The most common causes are ignition components (coil or plug) or the cylinder 1 fuel injector, followed by air leaks, compression issues, or wiring faults. Use a structured diagnostic approach: confirm with scan data, perform targeted tests (spark, coil, injector swaps), verify fuel pressure and compression, and inspect for vacuum leaks. Repairs range from a simple spark plug/coil replacement to more involved injector work or mechanical repairs, with total costs varying widely (roughly from a few hundred to several thousand dollars depending on the root cause and scope). No recalls or complaints are listed in the provided data for this model/year; this guide relies on general diagnostic practices and Charger-specific layout considerations. If in doubt, a professional diagnostic is recommended to prevent misdiagnosis and potential secondary damage.