Ignition Coil F Primary/Secondary Circuit Malfunction (Cylinder 6)
The P0356 code means the vehicle's onboard diagnostic system has detected: Ignition Coil F Primary/Secondary Circuit Malfunction (Cylinder 6). This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- easy
- Estimated cost
- $50 - $350 (parts and labor)
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What Are the Symptoms of P0356?
- Engine misfire on cylinder 6
- Rough idle and vibration
- Check Engine Light illuminated or flashing
- Reduced power
- Poor fuel economy
What Causes P0356? (Most Likely First)
- Faulty ignition coil on cylinder 6 Very High
- Worn or fouled spark plug on cylinder 6 High
- Damaged coil connector or wiring High
- PCM coil driver circuit failure for cylinder 6 Moderate
- Water or oil contamination in spark plug well Low
Can I Still Drive with P0356?
Short distances only. P0356 is rated moderate severity. Keep trips short and get it diagnosed soon rather than waiting for symptoms to worsen.
Frequently Asked Questions
Can I drive with code P0356?
You can drive short distances if the Check Engine Light is steady. A flashing light indicates catalytic converter damage risk -- stop driving and have it towed.
Is cylinder 6 the last cylinder on a V6?
Yes. On most V6 engines, cylinder 6 is at the rear of bank 2. It is often the hardest to access for coil and plug replacement.
Can I replace just the coil boot instead of the whole coil?
Some coil-on-plug designs have replaceable boots (the rubber piece that connects to the spark plug). If only the boot is cracked or carbon-tracked, you may be able to replace just the boot. However, if the coil itself has failed electrically, the entire unit must be replaced.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose P0356?
-
Swap cylinder 6 ignition coil with another cylinder and clear codes to test
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Inspect the spark plug on cylinder 6 for wear, fouling, or damage
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Measure coil resistance -- primary 0.4-2.0 ohms, secondary 6,000-15,000 ohms
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Check spark plug well for moisture or oil contamination
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Test PCM coil driver signal at the connector using a noid light or scope
Sources 2
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
- Cross-checked against the SAE J2012:2002 DTC table (2026-08-27)archived scan of the SAE standard — readable copy, not SAE’s current edition
Which Vehicles Commonly Get P0356?
- 2007-2017 Toyota Camry V6
- 2008-2018 Honda Accord V6
- 2005-2015 Ford Explorer V6
- 2010-2020 Chevrolet Traverse V6
- 2009-2019 Nissan Maxima V6
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