P2300 moderate

Ignition Coil A Primary Control Circuit Low

The P2300 code means the vehicle's onboard diagnostic system has detected: Ignition Coil A Primary Control Circuit Low. This is a moderate severity code.

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Keep driving?: Short distances only
DIY difficulty: moderate
Estimated cost: $50 - $300 (parts and labor)

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Common Symptoms

Engine misfire on one cylinder
Check Engine Light flashing
Rough idle and vibration
Reduced engine power
Poor fuel economy

Probable Causes (Ranked by Likelihood)

Failed ignition coil A Very High
Damaged wiring to ignition coil A High
Corroded ignition coil connector Moderate
ECM coil driver circuit fault Low

Step-by-Step Diagnostic Procedure

Swap coil A with a known good coil and see if the code follows the coil
Check the coil connector for corrosion or damage
Measure primary resistance of coil A (typically 0.5-2 ohms)
Inspect wiring from ECM to ignition coil A
Check for voltage at the coil connector with key on

Common Fixes by Vehicle

What techs usually find when diagnosing P2300 on specific vehicles — tap your vehicle for the fix and the exact part:

2006-2016 GM 5.3L/6.0L/6.2L LS Trucks easy DIY

Replace Cylinder 1 ignition coil (AC Delco). LS coils are COPs (coil-on-plug) -- pull #1, swap with #8 to verify. If miss follows the coil, replace. Also replace spark plug if >60k on OEM Iridium. Inspect coil harness for chafing at valve cover bolts.

Labor: 30 min

Common fix part ACDelco BS-C1511 LS Coil View on Amazon→ Compare fitment at PartsGeek→

2007-2017 Ford 5.4L/6.2L F-150/Super Duty easy DIY

Replace Cylinder 1 coil-on-plug with Motorcraft DG-521. Ford COPs fail individually. Also replace spark plug with Motorcraft SP-546 (5.4) or SP-542 (6.2). Inspect COP boot for damage -- torn boots cause secondary arcing.

Labor: 30 min

Common fix part Motorcraft DG-521 Coil View on Amazon→ Compare fitment at PartsGeek→

2007-2014 Chrysler 3.6L Pentastar (300, Charger, Wrangler) easy DIY

Replace #1 coil-on-plug. Chrysler Pentastar coils fail frequently -- especially on pre-2013 heads with the infamous left-bank head issue. Use Mopar OEM. If code continues after coil+plug, the cylinder head may have internal misfire (valve damage).

Labor: 30 min

Common fix part Mopar Pentastar Coil View on Amazon→ Compare fitment at PartsGeek→

Frequently Asked Questions

Can I drive with code P2300?

Short distances only. Driving with a misfiring cylinder can damage the catalytic converter. A flashing Check Engine Light means stop driving immediately.

What causes P2300?

Almost always a failed ignition coil. Swapping the coil to another cylinder and seeing if the code follows confirms the diagnosis.

Is P2300 expensive to fix?

Usually $50 to $300. Ignition coils are inexpensive and straightforward to replace. Consider replacing all coils at the same time for high-mileage vehicles.