Symptoms of P0382
- 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 P0382
- 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
- Compare glow/heater circuit B command, current draw, relay or module status, battery voltage, coolant temperature, and cold-start behavior.
- Inspect glow plugs or heater elements, module output, relay contacts, fuse links, harness resistance, connector heat damage, and grounds.
- Check circuit B separately from circuit A so the affected bank, group, or heater path is correctly identified.
Related OBD-II codes
These nearby ignition / misfire entries can help compare wording and pin down the fault area.