Ignition Coil C Primary/Secondary Circuit Malfunction (Cylinder 3)
The P0353 code means the vehicle's onboard diagnostic system has detected: Ignition Coil C Primary/Secondary Circuit Malfunction (Cylinder 3). This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- easy
- Estimated cost
- $50 - $300 (parts and labor)
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Common Symptoms
- Engine misfire on cylinder 3
- Rough idle and vibration
- Check Engine Light illuminated or flashing
- Reduced power
- Exhaust smells of unburned fuel
Probable Causes (Ranked by Likelihood)
- Faulty ignition coil on cylinder 3 Very High
- Worn or fouled spark plug on cylinder 3 High
- Damaged coil connector or wiring High
- PCM coil driver circuit failure for cylinder 3 Moderate
- Cracked coil boot causing spark blowout Low
Step-by-Step Diagnostic Procedure
-
Swap cylinder 3 ignition coil with another cylinder -- if the code moves, the coil is bad
-
Inspect the spark plug on cylinder 3 for wear, fouling, or damage
-
Measure coil primary resistance (0.4-2.0 ohms) and secondary resistance (6,000-15,000 ohms)
-
Check the coil connector and boot for cracks, carbon tracking, or melted plastic
-
Test the PCM driver signal at the coil connector
Common Fixes by Vehicle
What techs usually find when diagnosing P0353 on specific vehicles — tap your vehicle for the fix and the exact part:
2011-2020 Ford F-150 3.5L EcoBoost Moderate DIY
Ignition coil C failure is common on EcoBoost engines due to heat soak on the rear bank. Replace coil with Motorcraft DG-549 and inspect the connector for signs of melting or corrosion. Always replace the spark plug in that cylinder at the same time.
Labor: 0.5-1 hour2011-2019 Chrysler 300 3.6L Pentastar Moderate DIY
Coil pack #3 sits near the firewall where heat builds up. Replace with Mopar 56029129AB coil. Check the wiring harness connector for burnt pins -- a known issue on the 3.6L Pentastar. Apply dielectric grease to the new connector to prevent future corrosion.
Labor: 0.5-1 hour2012-2020 Ford Focus 2.0L Easy DIY
Cylinder 3 coil failure is often caused by coolant intrusion from a leaking thermostat housing gasket directly above it. Fix the coolant leak first or the new coil will fail again. Replace coil with Motorcraft DG-522 and clean the spark plug well thoroughly.
Labor: 0.5-1 hourFrequently Asked Questions
Can I drive with code P0353?
You can drive short distances with a steady Check Engine Light. If flashing, pull over immediately. On V6 engines, cylinder 3 may be on the rear bank, making it harder to access.
Can moisture cause ignition coil failure?
Yes. Water intrusion around the coil boot or connector can cause spark blowout or coil short-circuit. This is common on engines where the coils sit in deep spark plug wells that collect moisture.
What is carbon tracking on an ignition coil?
Carbon tracking appears as a dark line or arc mark on the coil boot or inside the spark plug well. It is a path where electricity has arced outside the intended path, and it means the coil boot or coil must be replaced.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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