Ignition Coil A Primary Control Circuit High
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.
- Keep driving?
- Short distances only
- DIY difficulty
- moderate
- Estimated cost
- $50 - $300 (parts and labor)
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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
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.
Mechanics Guide Step-by-step diagnosis
Step-by-Step Diagnostic Procedure
-
Swap coil A with another cylinder coil to confirm the coil is at fault
-
Check coil connector pins for shorts between terminals
-
Measure primary coil resistance and compare to specification
-
Inspect wiring for chafing or melted insulation near exhaust heat
-
Test the ECM coil driver output with a noid light
Sources 1
This page is built from documented references. Verify against your own service info before repair work.
- SAE J2012Diagnostic Trouble Code Definitions (defines the generic OBD-II code ranges)
Commonly Affected Vehicles
- 2010-2018 Toyota Camry V6
- 2012-2020 Honda Accord V6
- 2011-2019 Ford Edge V6
- 2013-2021 Nissan Maxima V6
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