P2300 means the ECM detected low voltage on the primary control circuit for ignition coil A (cylinder 1 on most engines). The affected cylinder is likely misfiring.
🚗 Not recommended. A dead coil causes a misfire that can damage the catalytic converter.
HIGH
severity
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The coil-on-plug unit has an internal primary winding fault.
#2Wiring or connector fault at the coil$40-$250
30%
Damaged coil connector, chafed wiring, or a poor ground.
#3ECM driver circuit fault$200-$900
10%
Rare; the coil driver inside the ECM has failed.
🩺 Common Symptoms
Misfire on one cylinder
Rough idle and shaking
Check engine light, often flashing
Loss of power
Poor fuel economy
💰 Repair Cost: DIY vs Shop
DIY Cost
$30-$150
Shop Cost
$120-$400
📋 Free OBD2 Code Cheat Sheet
The 50 most common codes with likely cause and DIY fix cost. Sent once, no spam.
🔧 How to Diagnose P2300
1Confirm which cylinder is coil A for your engine
2Swap the coil with an adjacent cylinder and see if the code follows
3Inspect the coil connector and wiring
4Replace the coil if the fault follows it
❓ Frequently Asked Questions
Can I drive with P2300?
Avoid extended driving. A misfiring cylinder dumps raw fuel into the exhaust and can ruin the catalytic converter. A flashing check engine light means stop soon.
How much to fix P2300?
A single coil is $30-$150 DIY, or $120-$400 at a shop including labor and diagnosis.
Is P2300 the same as a misfire code?
They are related. P2300 is a coil circuit fault; it usually appears alongside a misfire code like P0301 for the same cylinder.