Ignition Coil E Primary Control Circuit High
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.
- Keep driving?
- Short distances only
- DIY difficulty
- moderate
- Estimated cost
- $50 - $350 (parts and labor)
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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
-
Check spark plug well for water or oil intrusion
-
Swap coil E to another position to verify the coil is faulty
-
Inspect wiring from ECM to coil E for short circuits
-
Measure coil E primary and secondary resistance
-
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.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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