Ignition Coil Secondary Circuit Malfunction
The P2317 code indicates a problem in the secondary circuit of the ignition coil, which is responsible for delivering high voltage to the spark plugs. This can be caused by a faulty ignition coil, damaged wiring, or a poor electrical connection. The secondary circuit includes the coil itself, the spark plug wires, and the spark plugs. A malfunction can lead to misfires, reduced engine performance, and increased emissions.
01. Most Common Causes
- Faulty ignition coil
- Damaged or corroded wiring/connectors
- Cracked spark plug or boot
- Carbon tracking on coil or spark plug
02. Symptoms You Will Notice
- Engine misfire or rough idle
- Check Engine Light illuminated
- Reduced fuel economy
- Hesitation or loss of power during acceleration
03. Step-by-Step Diagnosis
Step 1: Scan for codes and note freeze frame data.
Step 2: Visually inspect ignition coil, wires, and spark plugs for damage or corrosion.
Step 3: Swap the suspect coil with another cylinder and see if the code moves.
Step 4: Test coil primary and secondary resistance with a multimeter.
Step 5: Check for proper voltage and ground at the coil connector.
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 due to unburned fuel.
How much does it cost to fix?▼
Typically $50-$150 for a single coil replacement, plus labor if done by a shop.