P2306 moderate

Ignition Coil D Primary Control Circuit Low

What does P2306 mean?

The P2306 code means the vehicle's onboard diagnostic system has detected: Ignition Coil D Primary Control Circuit Low. This is a moderate severity code.

Common Symptoms

  • Misfire on cylinder 4
  • Check Engine Light flashing or on
  • Vibration felt through steering wheel at idle
  • Reduced engine performance
  • Exhaust has rough or uneven sound

Probable Causes (Ranked by Likelihood)

  • Failed ignition coil D Very High
  • Damaged wiring to coil D High
  • Corroded connector at coil D Moderate
  • Fouled or cracked spark plug on cylinder 4 Moderate

Step-by-Step Diagnostic Procedure

  1. Swap coil D with another cylinder coil to verify

  2. Inspect spark plug on cylinder 4 for damage or fouling

  3. Check coil D connector and wiring for damage

  4. Measure coil D primary resistance

  5. Check for oil contamination in the spark plug well

Frequently Asked Questions

Can I drive with code P2306?

Short distances only. Address the misfire quickly to prevent catalytic converter damage.

What causes P2306?

Almost always a failed ignition coil on cylinder 4. Replace the spark plug at the same time for the best outcome.

Is P2306 expensive to fix?

Typically $50 to $300. One of the more affordable engine repairs, especially for four-cylinder engines where coil access is easy.

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