P2306Ignition System
Ignition Coil C Primary Control Circuit Low
P2306 means the ECM detected low voltage on the primary control circuit for ignition coil C. The cylinder served by coil C is likely misfiring.
🚗 Not recommended. The affected cylinder is misfiring and can harm the catalytic converter.
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🎯 Top Causes, Ranked by Likelihood
#1Failed ignition coil (cylinder C)$30-$120
Internal primary winding fault in the coil unit.
#2Wiring or connector fault at the coil$40-$250
Damaged connector, chafed wire, or bad ground.
#3ECM driver circuit fault$200-$900
Rare failure of the coil driver in the ECM.
🩺 Common Symptoms
- Single cylinder misfire
- Rough idle and shaking
- Check engine light, may flash
- Loss of power
- Poor fuel economy
💰 Repair Cost: DIY vs Shop
📋 Free OBD2 Code Cheat Sheet
The 50 most common codes with likely cause and DIY fix cost. Sent once, no spam.
🔧 How to Diagnose P2306
1Find which cylinder coil C serves on your engine
2Swap the coil with an adjacent cylinder to test if the code follows
3Inspect the coil connector and wiring
4Replace the coil if it is the source
❓ Frequently Asked Questions
Can I drive with P2306?
Not for long. A misfire can overheat and ruin the catalytic converter. Stop soon if the light flashes.
How much to fix P2306?
A single coil is $30-$150 DIY, or $120-$400 at a shop.
Does P2306 mean a bad coil?
Usually. Confirm by swapping the coil to another cylinder and seeing if the code moves before replacing.
🔗 Related Codes
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