Ignition Coil A Primary Control Circuit High
What does P2301 mean?
The P2301 code means the vehicle's onboard diagnostic system has detected: Ignition Coil A Primary Control Circuit High. This is a moderate severity code.
Common Symptoms
- Engine misfire on cylinder associated with coil A
- Check Engine Light illuminated or flashing
- Rough running engine
- Loss of power during acceleration
- Increased exhaust emissions
Probable Causes (Ranked by Likelihood)
- Short circuit in ignition coil A wiring Very High
- Failed ignition coil A (shorted internally) High
- Damaged coil A connector with shorted pins Moderate
- ECM coil driver transistor failure Low
Step-by-Step Diagnostic Procedure
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Swap coil A with another cylinder coil to confirm the coil is at fault
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Check coil connector pins for shorts between terminals
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Measure primary coil resistance and compare to specification
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Inspect wiring for chafing or melted insulation near exhaust heat
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Test the ECM coil driver output with a noid light
Frequently Asked Questions
Can I drive with code P2301?
Short distances only. Continued misfiring can overheat and damage the catalytic converter. Do not ignore a flashing Check Engine Light.
What causes P2301?
Usually a failed ignition coil or shorted wiring. The coil swap test is the fastest way to confirm whether the coil itself is the problem.
Is P2301 expensive to fix?
Typically $50 to $300. Ignition coil replacement is one of the more affordable engine repairs.