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P0351 means coil A has a primary or secondary winding fault - the coil won't fire consistently, causing a cylinder misfire. Coil A is typically cylinder 1. Swap it to an adjacent cylinder first to confirm the fault before buying parts. See top-rated scanners on Amazon ↗
🗺️ Where Is the Problem?
Blueprint view - P0351 Ignition Coil A primary/secondary circuit fault
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 P0351 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.
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🎯 Top Causes & Probability
55%
#1 - Most Likely
Failed Ignition Coil A
Coil A primary or secondary winding has failed or cracked under thermal stress. The ECM monitors coil primary current - an out-of-range reading triggers this code.
🔩 Part
$20–$100
👨🔧 Labor
$30–$100
⚡ DIY Difficulty
Easy
25%
#2 - Check First
Short in Coil A Wiring
A short to ground or voltage prevents normal current flow. Inspect the coil connector and harness for melted insulation or moisture intrusion.
🔩 Part
$20–$80
👨🔧 Labor
$50–$150
⚡ DIY Difficulty
Medium
12%
#3 - Less Common
Damaged Spark Plug Damaging Coil
A cracked or fouled plug forces excessive voltage, burning out the secondary winding. Replace both coil and spark plug simultaneously.
🔩 Part
$5–$30
👨🔧 Labor
$0–$80
⚡ DIY Difficulty
Easy
8%
#4 -
PCM Coil Driver Failure
PCM ignition driver circuit failed. Rare. Rule out coil, plug, and wiring before suspecting the PCM.
🔩 Part
$200–$800
👨🔧 Labor
$100–$300
⚡ DIY Difficulty
Hard
🚗 Most Affected Vehicles
🔧 Step-by-Step Diagnosis
- Swap Coil to Confirm Fault - Move the suspect coil to an adjacent cylinder. Clear codes and drive. If the misfire code moves to that cylinder, the coil is confirmed bad. This costs nothing and prevents unnecessary parts purchases.
- Inspect Coil and Spark Plug - Remove the coil and check the boot for carbon tracks or cracks. Check the spark plug for excessive gap, cracking, or oil fouling. A damaged plug can destroy a new coil - replace both together.
📍 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