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P2301 Ignition System
Ignition Coil A Primary Control Circuit High
P2301 means the ECM detected high voltage on the primary control circuit for ignition coil A (cylinder 1 on most engines), indicating the coil is not switching correctly.
🚗 Not recommended. A misfiring cylinder can overheat and damage the catalytic converter.
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🎯 Top Causes, Ranked by Likelihood
#1 Failed ignition coil (cylinder A) $30-$120
The coil primary circuit is open or shorted to voltage.
#2 Open or shorted coil wiring $40-$250
A break in the control wire or a short to power at the connector.
#3 ECM driver circuit fault $200-$900
The internal coil driver in the ECM has failed.
🩺 Common Symptoms Single cylinder misfire Rough idle Flashing or steady check engine light Hesitation under load Reduced power 💰 Repair Cost: DIY vs Shop
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🔧 How to Diagnose P2301 1 Identify coil A for your specific engine
2 Swap the coil to an adjacent cylinder to see if the code moves
3 Check the control wire for a short to power
4 Replace the coil if it is the source
❓ Frequently Asked Questions Can I drive with P2301?
Only briefly. A dead cylinder wastes fuel and can damage the catalytic converter, especially if the light is flashing.
What is the difference between P2300 and P2301?
P2300 is a low-voltage fault and P2301 is a high-voltage fault on the same coil A primary circuit. Both usually mean a bad coil or wiring.
How much does P2301 cost to fix?
About $30-$150 for a DIY coil, or $120-$400 at a shop.
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