P2326
Ignition Coil I Secondary Circuit
Ignition system
Generic OBD-II
Medium
What it means
P2326 means the engine computer detected a fault in the secondary (high-voltage) circuit of ignition coil "I." This side of the coil delivers spark to the plug, so a fault causes a weak or missing spark, a misfire, and reduced power. The usual causes are the coil, the spark plug, or the boot rather than internal engine damage.
Medium
Can I keep driving? Drivable but not ideal — a weak or missing spark on that cylinder causes a misfire that can, over time, damage the catalytic converter.
Common symptoms
What you'll notice
- Check-engine light on (may flash during an active misfire)
- Rough idle or a stumble/miss on that cylinder
- Hesitation and reduced power
- Slightly higher fuel consumption
Common causes
Most likely first
- Failed ignition coil I (secondary/high-voltage side)Likely
- Worn or fouled spark plug on that cylinderCommon
- Damaged or arcing spark plug boot or secondary wiringCommon
- Corroded or loose connector at the coilLess often
- Failed PCM/ECM (less common)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and identify which cylinder coil I serves for your engine.
- Inspect the spark plug and boot on that cylinder for wear, fouling, or arcing.
- Swap coil I with a known-good coil to see if the fault follows the coil.
- Check the coil connector and secondary components for damage.
- Replace the coil and/or plug as needed, then clear and re-test.
FAQ
Quick answers
Is it safe to drive with P2326?+
For short distances, yes, but a misfire from a weak spark can overheat and damage the catalytic converter. Repair it promptly, especially if the light is flashing.
Can I just clear P2326?+
It returns quickly unless the coil, plug, or secondary wiring is repaired.
Related codes
Often seen with P2326
Read & clear P2326 yourself
Scan your car, confirm the code, and clear it once it's fixed — with OBD DashX on your phone.
✓ Verified name — SAE J2012 / ISO 15031-6Guidance reviewed by OBD DashX