🚨 Diagnostic Profile
Vehicle/Equipment Make: GENERIC
Technical Description: Cylinder 6 Misfire Detected
This diagnostic trouble code indicates that the engine control module (ECM) has detected an irregular combustion event specifically in cylinder 6. This can be caused by ignition system failures, fuel delivery issues, or mechanical faults within that cylinder.
🚨 Repair Difficulty Tier
Tier: Intermediate
This repair typically requires an OBD-II scan tool capable of reading live sensor data and freeze frame information, along with a multimeter to test ignition coil resistance and injector circuits. Basic mechanical knowledge of engine components is necessary, though no specialized module programming is usually required unless the ECM itself needs recalibration.
🛠️ Resolution Steps
Step 1: Preliminary Inspection
Begin by visually inspecting the ignition coil, spark plug, and wiring harness connected to cylinder 6. Look for signs of carbon tracking, corrosion, oil fouling on the spark plug, or physical damage to the coil pack. Check the electrical connector for the injector on cylinder 6 for looseness or corrosion. Inspect the vacuum lines near that cylinder for cracks or disconnections that could cause a lean misfire condition.
Step 2: Diagnostic Verification
Connect an OBD-II scanner and pull live data for cylinder-specific misfire counts to confirm cylinder 6 is the consistent offender. Swap the spark plug and ignition coil from cylinder 6 with a neighboring cylinder to see if the misfire follows the part or stays with the cylinder location. Use a multimeter to check the ignition coil primary and secondary resistance against manufacturer specifications. Test injector pulse using a noid light or back-probe the injector connector to verify proper voltage and ground signals. Perform a compression or cylinder leak-down test if electrical components test normal, to rule out mechanical issues like a burnt valve or worn piston rings.
Step 3: Resolution & Reset Process
Replace any failed ignition coil, spark plug, or fuel injector identified during testing with OEM or OEM-equivalent parts. Clean and reseat all electrical connectors, applying dielectric grease to prevent future corrosion. After repairs, clear the stored diagnostic trouble codes using the scan tool and perform a test drive under varying load conditions to confirm the misfire does not return. Recheck live misfire counter data after the drive cycle to ensure cylinder 6 is now reading zero or near-zero misfire events.
📦 Parts, Labor, and Budget Estimates
Required Components/Software: Ignition coil pack, spark plug (iridium or OEM-spec), fuel injector (if faulty), OBD-II scan tool with live data capability, multimeter, noid light kit.
Average Component Price: Ignition coil: $40–$120; Spark plug: $8–$20 each; Fuel injector: $60–$150 (may vary significantly by vehicle platform).
Estimated Labor Hours: 1.0–2.5 hours for diagnostic and coil/spark plug replacement; add 0.5–1.5 hours if injector replacement or deeper mechanical testing is required.