Ignition Coil Secondary Circuit Malfunction
The P2317 code indicates a problem in the secondary circuit of ignition coil 'G' (specific cylinder). This circuit includes the coil itself, the spark plug, and the wiring between them. A fault can cause weak or no spark, leading to misfires, reduced power, and increased emissions. Common causes include a faulty ignition coil, damaged spark plug, or wiring issues.
1. Most Common Causes
- Faulty ignition coil
- Worn or fouled spark plug
- Open or shorted wiring in secondary circuit
- Poor electrical connection at coil or spark plug
2. Symptoms You Will Notice
- Engine misfire
- Check Engine Light on
- Rough idle
- Decreased fuel economy
- Engine hesitation or lack of power
3. Step-by-Step Diagnosis
Step 1: Scan for codes and note freeze frame data.
Step 2: Visually inspect ignition coil and spark plug for damage or corrosion.
Step 3: Swap ignition coil with another cylinder and see if code follows.
Step 4: Test coil primary and secondary resistance with a multimeter.
Step 5: Check spark plug condition and gap; replace if necessary.
4. 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 due to unburned fuel.
How much does it cost to fix?▼
Typically $50-$150 for a DIY coil replacement; labor adds $100-$200 at a shop.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.