P0302 Code: Ford F-150 (2021-2024) - Causes, Symptoms & Fixes

P0302 Diagnostic Guide for 2021-2024 Ford F-150 (OBD-II)

Important data notes (data limits)

• Real NHTSA data provided for this model/year/issue: no owner complaints found; no official recalls found.
• Recalls: No recalls found in NHTSA database.
• Because there are no complaints/recalls in the supplied data, this guide uses general automotive knowledge plus Ford-F150-specific tendencies to outline diagnostic steps and repair options. Actual fault frequency or recall-related fixes cannot be cited from the provided data.

CODE MEANING AND SEVERITY

• Code meaning: P0302 = Cylinder 2 Misfire Detected. The engine control module (PCM) has detected that cylinder 2 is not firing properly.
• Severity and implications:
  • Intermittent misfire: Often drivability is still acceptable, but fuel economy may suffer, and the catalytic converter can be damaged over time if the misfire persists.
  • Persistent or repeated misfire: Can cause rough idle, reduced power, increased exhaust emissions, and potential catalytic converter overheating/damage. Prolonged misfires can lead to downstream sensor issues and higher repair costs.
• Related context: On Ford OBD-II implementations, P0302 is one of several cylinder-specific misfire codes (P0301 = cylinder 1, P0303 = cylinder 3, etc.). If the misfire is not isolated to cylinder 2, P0300 (random/mmultiple misfires) may also appear or be suspected during testing.

COMMON CAUSES ON FORD F-150 (2021-2024)

• Primary ignition issues on cylinder 2:
  • Faulty ignition coil (coil-on-plug) for cylinder 2 or its wiring/connector
  • Faulty or fouled spark plug in cylinder 2
• Fuel delivery and injection:
  • Faulty or dirty fuel injector for cylinder 2
  • Low rail pressure or fuel supply issue affecting cylinder 2 unevenly
• Air and vacuum-related issues:
  • Vacuum leak or cracked/loose hose near the intake runner for cylinder 2
  • PCV system hose or valve issue
• Cylinder 2 mechanical conditions:
  • Low compression on cylinder 2 due to valve issues, piston ring wear, or head gasket problems
  • Carbon buildup in direct-injection engines affecting spray/mixture on cylinder 2
• Electrical and sensor-related:
  • Damaged injector/coil wiring harness or connector to cylinder 2
  • PCM/ECM sensor misreporting (less common, but possible)
• Other contributing factors:
  • Poor fuel quality or contaminated fuel
  • Exhaust or catalytic converter issues if misfire protection is degraded and the converter overheats

SYMPTOMS ASSOCIATED WITH P0302

• Inconsistent or rough idle; engine may shake at idle
• Noticeable loss of power or throttle response on acceleration
• Check Engine Light (CEL) / Malfunction Indicator Lamp (MIL) illuminated
• Increased or fluctuating fuel consumption
• Possible temporary smell of unburned fuel or exhaust-related odor
• In some cases, misfire can be felt more when under load or at specific RPM ranges

DIAGNOSTIC STEPS

Important approach: Use a quality OBD-II scanner capable of live data and, if available, cylinder misfire counters. For Ford vehicles, Ford’s IDS or compatible tools can help with cylinder contribution tests and factory data; generic tools can still identify the P0302 code and provide freeze-frame data.

Step-by-step procedure:

• Step 0: Confirm and document

  • Confirm P0302 is current with the vehicle’s scan data. Note freeze-frame data (engine RPM, load, coolant temp, fuel trim, misfire counters) and any other codes (P0300, P0352, P035? etc.).
  • Note driving conditions when the misfire occurs (load, RPM, temperature, idle vs. under load).

• Step 1: Visual inspection

  • Remove and inspect spark plug for cylinder 2: fouling, oil wetness, electrode wear, gap size (compare to spec). Replace if degraded.
  • Inspect ignition coil and its connector for corrosion, oil intrusion, or damaged wiring. Look for loose connections or damaged boots.
  • Check the cylinder 2 fuel injector electrical connector for corrosion or damaged pins.
  • Inspect intake manifold runner for cylinder 2 for cracks or loose vacuum lines; inspect PCV hoses.
  • Look for signs of oil leaks around the cylinder head or valve cover area that might affect plug/coil.

• Step 2: Swap tests (to isolate the faulty component)

  • Coil swap: Move the cylinder 2 ignition coil to another cylinder (e.g., cylinder 4) and watch whether P0302 moves to that cylinder or stays. If the misfire follows the coil, the coil or its wiring is the culprit.
  • Spark plug swap: Move the spark plug from cylinder 2 to another cylinder and see if the misfire follows the plug.
  • Injector swap: If you have two similar injectors available, swap cylinder 2 injector with another cylinder and observe if the misfire code changes cylinders. If the misfire follows the injector, that injector is the likely cause.
  • Note: Some Ford engines have coil-on-plug assemblies with separate electrical connectors; handle carefully and avoid twisting wiring harnesses.

• Step 3: Electrical tests

  • Check resistance of ignition coil secondary (if accessible) and compare to spec.
  • Check resistance and continuity of the cylinder 2 injector and its driver circuit (using a multimeter and/or oscilloscope if available). Look for open/short circuits or abnormal waveforms.
  • Inspect wiring harnesses for continuity between PCM and cylinder 2 connector; look for damaged insulation or pin bending.

• Step 4: Fuel system checks

  • Check fuel pressure with appropriate gauge (rail pressure vs. spec for the exact engine variant). Verify pressure is within Ford spec and stable when cranking.
  • If possible, perform a cylinder balance test or injector buzz test to confirm that injector 2 is delivering fuel when commanded.

• Step 5: Mechanical checks

  • Perform a compression test on cylinder 2 and compare to adjacent cylinders. A significant deviation indicates mechanical issues (valve issues, piston rings, head gasket).
  • If compression is low, consider a leak-down test to locate the source (valve seal, head gasket, etc.).
  • If compression is acceptable, focus on ignition and fuel delivery first.

• Step 6: Vacuum and emissions-related checks

  • Perform a smoke test to identify vacuum leaks around the intake manifold and cylinder 2 runner area.
  • Inspect EGR valve operation and PCV system; a sticking EGR or PCV valve can cause misfires under certain conditions.

• Step 7: Re-test and confirm

  • After addressing the identified cause, clear the codes and perform a test drive to confirm the misfire is resolved and no new codes appear.

• Step 8: If unresolved

  • If all above checks fail to identify the cause, consider professional diagnostic help. In some cases, a PCM software update or fault in the engine control logic may require dealership-level diagnostics.

RELATED CODES

• P0300: Random or multiple misfires (not limited to cylinder 2)
• P0301: Cylinder 1 misfire
• P0303: Cylinder 3 misfire
• P0304: Cylinder 4 misfire
• P0352: Ignition coil “B” secondary circuit / Coil 2 (if applicable to your engine’s coil wiring arrangement)
• Other ignition-related codes (P035x family) may appear if a specific coil or driver circuit is failing
  Note: The above are common associations for misfire diagnoses and are not NHTSA-listed data. Use your scan tool to confirm which circuits are affected.

REPAIR OPTIONS AND COSTS (2025 PRICES)

Prices will vary by region, shop, engine variant (2.7/3.5 EcoBoost vs. 5.0 V8), and parts quality. The ranges below reflect typical U.S. pricing in 2025 for common scenarios on a Ford F-150.

• Spark plug replacement (cylinder 2)

  • Parts: $3–$25 (depends on plug type: copper, platinum, iridium)
  • Labor: 0.4–1.0 hours
  • Typical total: $60–$150

• Ignition coil replacement (cylinder 2)

  • Parts: $60–$180
  • Labor: 0.5–1.0 hours
  • Typical total: $120–$320
  • Notes: Coil-on-plug systems often require replacing the specific coil; if other coils show wear preventive replacement can be considered.

• Fuel injector replacement (cylinder 2)

  • Parts: $120–$350
  • Labor: 0.7–1.5 hours
  • Typical total: $350–$700
  • Notes: Injector failure is a common cause of persistent misfires; sometimes cleaning is attempted first, but replacement is often more reliable.

• Fuel system and fuel pressure related items

  • Fuel pressure regulator or pump (if faulty and contributing to misfire)
  • Parts: $80–$400
  • Labor: 1–2 hours
  • Typical total: $200–$600

• Vacuum leaks / PCV / gaskets

  • Parts: $10–$150 (depending on hoses/gaskets)
  • Labor: 0.5–2.0 hours
  • Typical total: $100–$400

• Mechanical causes (low compression, valve, head gasket)

  • Parts: $100–$1,000+ for gasket/seals; full engine work is more
  • Labor: 4–12+ hours
  • Typical total: $1,200–$3,500+ (head gasket/valve issues may run higher depending on engine variant and required disassembly)

• PCM/ECM fault (rare)

  • Parts: $350–$1,000
  • Labor: 1–3 hours
  • Typical total: $500–$1,500
  • Notes: If a software update or recalibration is required, the dealer may perform this with a service bulletin.

General guidance:

• In many cases, the most cost-effective fix starts with the simplest causes (spark plug, coil, injector) and moves toward mechanical issues if the simple fixes don’t resolve the misfire.
• When multiple cylinders show misfires or when the misfire persists after coil/plug/injector service, consider a broader diagnosis for fuel delivery or compression issues.

DIY VS PROFESSIONAL

• DIY-feasible tasks (with proper tools and safety):
  • Inspecting and replacing the spark plug for cylinder 2 (if accessible)
  • Replacing the ignition coil for cylinder 2 (if accessible)
  • Swapping coils/plugs/injectors to isolate the faulty component in a controlled test (as described above)
  • Basic electrical checks (connector condition, continuity with a multimeter)
  • Quick fuel rail pressure checks with a suitable gauge (if available) and basic fuel injector tests
• DIY caveats:
  • On Ford F-150 EcoBoost and other direct-injected engines, some spark plug locations may be difficult and require removing intake components; improper resealing can lead to vacuum leaks or oil leaks.
  • Working with high-pressure fuel systems and precise fuel injector testing often benefits from professional-grade tools (fuel pressure tester, scan tool with cylinder balance/ injector buzz test, proper torque specs).
• When to seek professional help:
  • If coil/spark plug replacement doesn’t fix the misfire
  • If you observe abnormal compression results or a suspected mechanical issue
  • If you suspect a faulty fuel injector(s) or high-pressure fuel system problem
  • If you need advanced diagnostic tools (e.g., Ford IDS, OEM software updates)

PREVENTION

• Regular maintenance:
  • Replace spark plugs at the intervals recommended by Ford for your exact engine (and use OEM-grade or equivalent plugs suitable for direct-injected engines).
  • Replace ignition coils or other ignition components if there are signs of wear or if failures have occurred in the past.
  • Keep air intake clean and replace the air filter at recommended intervals to maintain proper air-fuel mixture.
• Fuel system health:
  • Use high-quality fuel and avoid contaminated fuel. Periodic use of a reputable fuel system cleaner designed for direct-injected engines can help reduce deposit buildup.
  • If your vehicle tends to short-trip idling, consider longer drives to help heat cycles burn off deposits.
• Diagnostics and software:
  • If you experience recurring misfires, having the PCM software updated (via dealer or authorized shop) can help in some cases where calibration plays a role.
• Driving habits:
  • Avoid sustained high-load driving with an existing misfire, as continued misfiring can damage the catalytic converter and increase emissions.
• Proactive checks:
  • Periodically inspect ignition wiring harnesses and connectors for wear, oil exposure, or corrosion around coil/injector connections.

Bottom line

• P0302 on a 2021-2024 Ford F-150 indicates Cylinder 2 misfire. Start with simple ignition and fuel delivery checks (spark plug, coil, injector, wiring) and then move toward mechanical checks (compression, leaks) if the problem persists.
• With no NHTSA complaints or recalls in the provided data, there is no recall or complaint-driven fix to reference. Use the diagnostic steps above to isolate the issue, and consider professional help for more complex electrical or mechanical diagnoses.
• Costs shown are typical 2025 ranges; real prices can vary. Always obtain an estimate that includes parts and labor before proceeding.