Ignition Coil B Primary Control Circuit Low
What does P2302 mean?
The P2302 code means the vehicle's onboard diagnostic system has detected: Ignition Coil B Primary Control Circuit Low. This is a moderate severity code.
Common Symptoms
- Engine misfire on cylinder 2
- Check Engine Light flashing
- Rough idle and engine vibration
- Reduced power output
- Smell of unburned fuel from exhaust
Probable Causes (Ranked by Likelihood)
- Failed ignition coil B Very High
- Damaged wiring to ignition coil B High
- Corroded coil B connector Moderate
- ECM coil driver circuit fault Low
Step-by-Step Diagnostic Procedure
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Swap coil B with another cylinder coil to verify the fault follows
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Check coil B connector for corrosion or damage
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Measure coil B primary resistance
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Inspect wiring harness to coil B for damage
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Also replace the spark plug if it appears worn or fouled
Frequently Asked Questions
Can I drive with code P2302?
Short distances only. Stop driving immediately if the Check Engine Light is flashing, as this indicates active catalyst-damaging misfires.
What causes P2302?
Usually a failed ignition coil on cylinder 2. Replace the spark plug at the same time since a worn plug can contribute to coil failure.
Is P2302 expensive to fix?
Typically $50 to $300. Coil and spark plug replacement together is a common repair that most DIY mechanics can handle.