P2324
Ignition Coil I Primary Control Circuit Low
Ignition
Generic OBD-II
Medium
What it means
P2324 means the ECM has seen low voltage (typically a short to ground or an open) on the primary control circuit for ignition coil I, so that coil may not fire its cylinder properly. The usual result is a misfire, rough idle, and reduced power. Common causes are a failed coil, a wiring or connector fault, or a short in the control circuit.
Medium
Can I keep driving? Drivable but likely misfiring on one cylinder — avoid extended or hard driving, as a sustained misfire can damage the catalytic converter.
Common symptoms
What you'll notice
- Check-engine light on (may flash during an active misfire)
- Rough idle and engine shake
- Hesitation or stumble on acceleration
- Reduced power and rougher running under load
Common causes
Most likely first
- Failed ignition coil ILikely
- Short to ground or open in the coil I primary control wiringCommon
- Corroded or loose coil connectorCommon
- Chafed harness or poor ground near the coilLess often
- Faulty ECM/ignition-module driver (less common)Less often
How to diagnose & fix
Work through it in order
- Read freeze-frame data and note any cylinder-specific misfire codes.
- Inspect the coil I connector and wiring for damage, corrosion, or a short to ground.
- Swap coil I with a neighbouring coil and see whether the fault follows the coil.
- Check the primary control wire for a short to ground or open back to the ECM.
- Replace the coil if it fails testing; repair wiring faults otherwise. Clear and re-test.
FAQ
Quick answers
Is it safe to drive with P2324?+
Only briefly. A dead or weak coil means one cylinder isn't firing, and unburned fuel can overheat and damage the catalytic converter. Fix it soon, especially if the light is flashing.
Can I just clear P2324?+
It will return quickly if the coil or its wiring is faulty. Clearing it does not fix the misfire.
Related codes
Often seen with P2324
Read & clear P2324 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