P0356 on Ford
Ignition Coil F Primary/Secondary Circuit Malfunction
P0356 on Ford vehicles indicates ignition coil f primary/secondary circuit malfunction. Au7o has documented this code across 1 Ford model — most commonly on F-150. The ECM/PCM detected a primary or secondary circuit fault on ignition coil 'F' (6+ cylinder engines). The expected coil pulse/feedback was missing or invalid, pointing to the coil, its wiring/connector, or its PCM driver. Typical repair costs on Ford range from $200 to $800, depending on the specific model and root cause.
Common Causes of P0356
- •Faulty ignition coil 'F'
- •Open/short in primary or secondary wiring
- •Corroded or loose coil connector
- •Bad spark plug overloading the coil
- •Failed coil driver in the PCM
P0356 on Ford by Model
Ford F-150(1 issue)
- Coil-On-Plug (COP) Ignition Coil Failure — Misfire and Rough Idle (Triton V8)1997-2008
The 4.6L and 5.4L Triton V8s use one coil-on-plug per cylinder, and these coils are a very common failure item — subjected to heat, vibration, and moisture from cowl leaks — typically starting after 80k miles. A failed coil sets a cylinder-specific misfire (P0301-P0308) and often a matching coil-circuit code (P0351-P0358), causing a shake at idle, hesitation, and a flashing check-engine light. Repeat failures on the same cylinder usually mean oil is leaking from the valve-cover gasket into the plug well and shorting the coil.
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View P0356 across all makes →Frequently Asked Questions
What does P0356 mean on Ford?▼
P0356 stands for "Ignition Coil F Primary/Secondary Circuit Malfunction." The ECM/PCM detected a primary or secondary circuit fault on ignition coil 'F' (6+ cylinder engines). The expected coil pulse/feedback was missing or invalid, pointing to the coil, its wiring/connector, or its PCM driver. On Ford specifically, this code is documented across 1 model.
What causes P0356 on Ford vehicles?▼
Common causes on Ford: Faulty ignition coil 'F', Open/short in primary or secondary wiring, Corroded or loose coil connector, Bad spark plug overloading the coil, Failed coil driver in the PCM. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix P0356 on a Ford?▼
Repair costs on Ford range from $200 to $800, depending on the specific model and root cause.
Which Ford models have P0356 documented?▼
Au7o has documented P0356 on 1 Ford model: F-150.