Ignition Coil E Primary Control Circuit High
What does P2309 mean?
The P2309 code means the vehicle's onboard diagnostic system has detected: Ignition Coil E Primary Control Circuit High. This is a moderate severity code.
Common Symptoms
- Misfire on cylinder 5
- Check Engine Light on
- Engine vibration and rough running
- Loss of power under acceleration
- Higher than normal exhaust emissions
Probable Causes (Ranked by Likelihood)
- Short circuit in coil E wiring Very High
- Internally shorted ignition coil E High
- Moisture in coil E spark plug well Moderate
- ECM coil driver fault Low
Step-by-Step Diagnostic Procedure
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Check spark plug well for water or oil intrusion
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Swap coil E to another position to verify the coil is faulty
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Inspect wiring from ECM to coil E for short circuits
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Measure coil E primary and secondary resistance
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Check for intake manifold gasket leaks that could allow water into plug wells
Frequently Asked Questions
Can I drive with code P2309?
Short distances only. Continued misfiring will damage the catalytic converter. Get the coil replaced promptly.
What causes P2309?
Usually a failed ignition coil or moisture in the spark plug well. V-engines with intake manifold valley leaks are particularly prone to this issue.
Is P2309 expensive to fix?
Typically $50 to $350. Straightforward coil replacement. Check for water or oil in the plug well to address the root cause.