P2323 — Ignition Coil "H" Secondary Circuit
P2323 — Ignition Coil "H" Secondary Circuit. A fault in the ignition system. Short, gentle driving to a shop is usually possible. Typical causes: worn spark plugs or wrong plug gap, failed ignition coil or coil pack, faulty ignition control circuit in the ECM.
powertrain (engine/transmission)
Is it safe to drive?
Drive with caution Drive with caution and avoid load. Ignition faults cause misfires that quickly overheat and destroy the catalytic converter; if the Check Engine Light flashes, stop and fix it first.
How to diagnose with an OBD scanner
- Read the code and freeze frame Connect an OBD2 scanner, confirm P2323 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
- Check for companion codes and TSBs Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
- Inspect wiring and connectors Visually inspect the wiring harness and connectors related to the ignition system for damage, corrosion, chafing or poor contact.
- Subsystem check Swap the coil to another cylinder and see if the fault code follows it.
- Subsystem check Inspect spark plugs for wear, oil or carbon tracks and check plug gaps.
- Verify the repair Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P2323 does not return.
Approximate repair cost
Repair cost depends on which component actually failed. Typical scenarios for P2323 (parts and labor, USD, independent shop rates): Replace spark plugs: $90–$250; Repair coil wiring or connector: $80–$250; Replace an ignition coil: $150–$380. Overall, fixing P2323 usually costs between $80 and $380. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.
Common questions
How much does it cost to fix P2323?
Replace spark plugs — $90–$250; Repair coil wiring or connector — $80–$250; Replace an ignition coil — $150–$380. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.
Is it safe to drive with P2323?
Drive with caution and avoid load. Ignition faults cause misfires that quickly overheat and destroy the catalytic converter; if the Check Engine Light flashes, stop and fix it first.
How do I diagnose P2323 myself?
Start with a scan: confirm P2323, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the ignition system, and verify the suspect component against live data before buying parts.
Will P2323 clear itself?
Sometimes P2323 clears after a few drive cycles if the fault was intermittent — for example a loose connector or a tank of bad fuel. The underlying cause usually remains, so the code tends to return. Clear it once; if it comes back, diagnose rather than erase it repeatedly.
What are the symptoms of P2323?
Drivers most often notice: loss of power and jerking, increased fuel consumption, misfires under load or at idle, hard starting, especially in damp weather.
What does P2323 mean?
Behind P2323 is a specific failure in the ignition system: ignition coil "H" secondary circuit. The onboard computer stores it in the powertrain (engine/transmission) group after verifying the fault over repeated checks.
The module monitors this system continuously while driving. When readings fall outside the expected range for a defined number of drive cycles, it stores P2323 and switches on the warning light. Freeze frame data saved with the code shows the exact conditions — rpm, load, temperature, speed — at the moment the fault was detected, which is the best starting point for diagnosis.
Common symptoms of P2323
- loss of power and jerking
- increased fuel consumption
- misfires under load or at idle
- hard starting, especially in damp weather
- Check Engine Light on
What causes P2323?
- faulty ignition control circuit in the ECM
- moisture or oil in the spark plug wells
- failed ignition coil or coil pack
- damaged coil wiring or connector
- worn spark plugs or wrong plug gap
How to diagnose P2323
- Connect an OBD2 scanner, confirm P2323 is stored, and save the freeze frame data — it shows engine conditions when the fault was detected.
- Related codes often reveal the real root cause. Also check manufacturer technical service bulletins (TSB) for your make and model — many P0xxx issues have factory fixes or software updates. Search by VIN on the manufacturer site or nhtsa.gov.
- Visually inspect the wiring harness and connectors related to the ignition system for damage, corrosion, chafing or poor contact.
- Swap the coil to another cylinder and see if the fault code follows it.
- Inspect spark plugs for wear, oil or carbon tracks and check plug gaps.
- Clear the code, complete a full drive cycle including the conditions from the freeze frame, and confirm P2323 does not return.
How to fix P2323
Start with the cheapest and most common causes before replacing expensive parts:
- Replace spark plugs — $90–$250
- Repair coil wiring or connector — $80–$250
- Replace an ignition coil — $150–$380
How much does it cost to fix P2323?
Repair cost depends on which component actually failed. Typical scenarios for P2323 (parts and labor, USD, independent shop rates):
- Replace spark plugs: $90–$250
- Repair coil wiring or connector: $80–$250
- Replace an ignition coil: $150–$380
Overall, fixing P2323 usually costs between $80 and $380. An accurate diagnosis before buying parts saves money — the most expensive scenario is rarely the first one to check.
Can you drive with P2323?
Drive with caution and avoid load. Ignition faults cause misfires that quickly overheat and destroy the catalytic converter; if the Check Engine Light flashes, stop and fix it first.