INDEPENDENT REFERENCE
P0301 — Cylinder 1 misfire detected
Generic powertrain DTC · HIGH priority for follow-up (not a certified safety rating)
What the code means
Misfire detected on cylinder 1; the cylinder-numbering convention depends on engine design.
What you might notice
Shaking; hesitation; flashing check-engine light.
Possible causes — not a diagnosis
Spark plug or coil fault; injector issue; intake leak; compression loss.
Useful diagnostic checks
Verify cylinder identification; compare ignition and fuel components safely; inspect compression and wiring.
Next steps
Correct the demonstrated ignition, fueling, or mechanical fault.
Related OBD-II codes
These generic definitions are explanatory summaries of commonly standardized OBD-II powertrain conditions. Vehicle-specific code logic and service procedures must be verified against manufacturer documentation. EPA: On-board diagnostics.