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P0356 isolates the fault to coil F (cylinder 6). Swap with another coil to confirm. Cylinder 6 on V6/V8 transverse engines is often at the back of the engine and harder to access - budget extra labor. See ignition coils on Amazon ↗
🗺️ Where Is the Problem?
Blueprint view - P0356 fault localized to cylinder #1 (spark plug, ignition coil, or fuel injector)
These are statistical causes across ALL vehicles - your exact car may rank differently
For example, on a Honda 4-cyl the downstream O2 sensor causes P0356 64% of the time, but on a GM 5.3L V8 the catalytic converter is the cause 71% of the time. Get a probability ranking built specifically for your year, make, model, and mileage.
🔎 Get the ranking for my exact car - $5.99 →
🎯 Top Causes & Probability
60%
#1 - Most Likely
Failed Ignition Coil (Cylinder 6)
The coil-on-plug for cylinder 6 has failed internally or its boot has cracked. On many V6 transverse engines this coil sits at the back against the firewall and runs hotter, accelerating failure. Replacement clears the code and restores power.
🔩 Part
$25–$140
👨🔧 Labor
$60–$160
⚡ DIY Difficulty
Medium
25%
#2 - Check First
Damaged Coil Connector or Wiring
The coil 6 connector is often the worst exposed to heat on a transverse V6, and connector pin issues are common. Inspect carefully before replacing the coil.
🔩 Part
$0–$30
👨🔧 Labor
$60–$100
⚡ DIY Difficulty
Easy
15%
#3 - Less Common
Bad PCM Ignition Driver
A failed PCM driver for coil F is rare but possible. Confirm by scoping the coil control wire with a known-good coil installed.
🔩 Part
$200–$900
👨🔧 Labor
$80–$200
⚡ DIY Difficulty
Hard
🚗 Most Affected Vehicles
🚦 Is It Safe to Drive?
P0356 should be addressed quickly. Like P0355, a non-firing cylinder can damage the catalytic converter through unburned-fuel exposure. Heavy shaking or loss of power means it is time for a tow.
🔧 Step-by-Step Diagnosis
- Swap Coil F with a Front-Bank Coil - Move coil 6 to a more accessible cylinder and rescan. If the misfire follows the coil, replace it.
- Inspect Connector for Heat Damage - Look for melted plastic and green oxide on the connector pins. Repair with a pigtail kit if the connector is the issue.
📍 Find a Trusted Shop Near You
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Tips for Choosing a Shop
- Ask if they charge a diagnostic fee and whether it applies toward the repair
- Request a written estimate before approving any work
- Ask specifically about the part brand - OEM vs. aftermarket matters for this code
- Check Google reviews for recent mentions of the specific repair you need