Ignition Coil Secondary Circuit Malfunction (P2314)
The P2314 code indicates a problem in the secondary circuit of ignition coil 'D' (or specific cylinder). This circuit includes the coil itself, the spark plug, and the wiring between them. A fault here can cause weak or no spark, leading to misfires, reduced power, and increased emissions. Common causes include a faulty ignition coil, worn spark plug, or damaged wiring/connectors.
01. Most Common Causes
- Faulty ignition coil
- Worn or fouled spark plug
- Open or short in secondary wiring
- Poor electrical connection at coil or plug
02. Symptoms You Will Notice
- Engine misfire (especially under load)
- Check Engine Light illuminated
- Rough idle or hesitation
- Decreased fuel economy
03. Step-by-Step Diagnosis
Step 1: Scan for codes and note freeze frame data.
Step 2: Visually inspect ignition coil, spark plug, and wiring for damage.
Step 3: Swap coil with another cylinder and see if code follows.
Step 4: Test spark plug condition and gap; replace if worn.
Step 5: Check resistance of coil secondary winding with multimeter.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as it can cause catalytic converter damage from unburned fuel.
How much does it cost to fix?▼
Typically $50-$150 for a DIY coil replacement; shop labor may add $100-$200.