Symptoms of P0384
- Rough idle, shaking, or a stumble under acceleration.
- A flashing check-engine light during an active misfire.
- Power loss and higher fuel consumption.
Common causes of P0384
- Worn spark plugs, ignition coils, or plug wires.
- Fuel-delivery problems — injectors, pressure, or a lean/rich mixture.
- Vacuum leaks, low compression, or a mechanical fault in that cylinder.
Useful checks before replacing parts
- Review circuit B feedback voltage, relay command, module output, battery voltage, freeze-frame temperature, and related heater circuit codes.
- Inspect for open load paths, short-to-voltage faults, stuck relays, poor ground feedback, connector heat damage, and incorrect replacement components.
- Compare commanded on and off states to see whether the circuit is stuck high, unloaded, or falsely reported by the control module.
Related OBD-II codes
These nearby ignition / misfire entries can help compare wording and pin down the fault area.