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Powertrain fault code

P0356: Ignition Coil "F" Primary/Secondary Circuit

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Often comes with a misfire. If the engine light flashes, stop driving.

What P0356 means

The engine computer has found an electrical fault in an ignition coil circuit.

Common causes

  • Failed ignition coil
  • Damaged coil wiring or connector

What to check first

  1. Check the coil connector.
  2. Swap coils between cylinders to see whether the fault follows the coil.

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Read your car's codes yourself, free

Plug a cheap ELM327 OBD-II adapter into the port under the dashboard and open the scan tool: Chrome or Edge on a computer with a USB adapter, or Chrome on Android with a Bluetooth LE adapter. It reads and clears codes and shows emissions readiness. It does not work on iPhone.

Open the free scan tool

Need help with P0356?

Tell us your car and what it is doing with P0356. We reply by email with what to check first, in plain words. Free.

Related codes

P0351P0352P0353P0354P0355P0357P0358P0359

General guidance only, not a diagnosis. A qualified mechanic should confirm the cause before you replace parts.