P2307 moderate

Ignition Coil D Primary Control Circuit High

The P2307 code means the vehicle's onboard diagnostic system has detected: Ignition Coil D Primary Control Circuit High. This is a moderate severity code.

My Garage →
Keep driving?
Short distances only
DIY difficulty
moderate
Estimated cost
$50 - $400 (parts and labor)
Recommended Tool
ANCEL AD310 OBD-II Scanner

Best-selling code reader on Amazon. Reads and clears check engine codes on any 1996+ vehicle. Under $30.

Check Price on Amazon

Affiliate link -- we earn a commission at no extra cost to you.

Every Tech Needs This
AstroAI Digital Multimeter

Essential for diagnosing sensor codes, checking voltage, and testing circuits. Under $15 and pays for itself on the first job.

Check Price on Amazon

Affiliate link -- we earn a commission at no extra cost to you.

Common Symptoms

  • Cylinder 4 misfire detected
  • Check Engine Light illuminated
  • Engine rough at idle and under load
  • Poor acceleration response
  • Increased tailpipe emissions

Probable Causes (Ranked by Likelihood)

  • Short in ignition coil D wiring Very High
  • Internally shorted ignition coil D High
  • Water or oil in spark plug well causing arcing Moderate
  • ECM coil driver output shorted high Low

Step-by-Step Diagnostic Procedure

  1. Check spark plug well on cylinder 4 for moisture or oil

  2. Swap coil D to another cylinder to confirm it is the coil

  3. Inspect wiring to coil D for insulation damage

  4. Measure coil D resistance values against specification

  5. Check valve cover gasket for leaks into plug wells

Frequently Asked Questions

Can I drive with code P2307?

Short distances only. Continued misfiring will damage the catalytic converter and increase emissions.

What causes P2307?

Commonly a failed coil or fluid in the spark plug well. If oil is found in the well, the valve cover gasket and tube seals need replacement.

Is P2307 expensive to fix?

Usually $50 to $400. The coil itself is cheap. If valve cover gasket work is needed, that adds to the total cost.

Sources

This page is built from documented references. Verify against your own service info before repair work.

Explore More

Search codes Vehicle-specific fixes Guides By make

Was this helpful?

Share carcodefinder.com with a friend who needs to decode their check engine light.

Browse by symptom → Read repair guides → Fixes by vehicle →