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.
- Keep driving?
- Short distances only
- DIY difficulty
- moderate
- Estimated cost
- $50 - $300 (parts and labor)
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What Are the Symptoms of P2300?
- Engine misfire on one cylinder
- Check Engine Light flashing
- Rough idle and vibration
- Reduced engine power
- Poor fuel economy
What Causes P2300? (Most Likely First)
- Failed ignition coil A Very High
- Damaged wiring to ignition coil A High
- Corroded ignition coil connector Moderate
- ECM coil driver circuit fault Low
Can I Still Drive with P2300?
Short distances only. P2300 is rated moderate severity. Keep trips short and get it diagnosed soon rather than waiting for symptoms to worsen.
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
2007-2017 Ford 5.4L/6.2L F-150/Super Duty easy DIY
Replace Cylinder 1 coil-on-plug with an OE-quality Motorcraft unit. Ford COPs fail individually. Also replace spark plug with Motorcraft (5.4) or SP-542 (6.2). Inspect COP boot for damage -- torn boots cause secondary arcing. Confirm the exact part for your year and engine with a retailer's fitment lookup or your VIN before ordering - these applications split by engine and build date.
Labor: 30 min2007-2014 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 minFrequently 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.
Mechanics Guide Step-by-step diagnosis
How Do You Diagnose P2300?
-
Swap coil A with a known good coil and see if the code follows the coil
-
Check the coil connector for corrosion or damage
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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
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)
Which Vehicles Commonly Get P2300?
- 2010-2018 Ford F-150 V8
- 2012-2020 Chevrolet Silverado V8
- 2011-2019 Toyota Tundra V8
- 2013-2021 Ram 1500 V8
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