P2320 — Ignition Coil "G" Secondary Circuit
P2320 — Ignition Coil "G" Secondary Circuit. A fault in the ignition system. Short, gentle driving to a shop is usually possible. Typical causes: moisture or oil in the spark plug wells, failed ignition coil or coil pack, damaged coil wiring or connector.
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 P2320 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 P2320 does not return.
Approximate repair cost
Repair cost depends on which component actually failed. Typical scenarios for P2320 (parts and labor, USD, independent shop rates): Replace an ignition coil: $150–$380; Repair coil wiring or connector: $80–$250; Replace spark plugs: $90–$250. Overall, fixing P2320 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
Is it safe to drive with P2320?
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.
What does OBD2 code P2320 mean?
P2320 — Ignition Coil "G" Secondary Circuit. A fault in the ignition system. Short, gentle driving to a shop is usually possible. Typical causes: moisture or oil in the spark plug wells, failed ignition coil or coil pack, damaged coil wiring or connector.
What is the most common cause of P2320?
The most common causes are: moisture or oil in the spark plug wells, failed ignition coil or coil pack, damaged coil wiring or connector.
Will P2320 clear itself?
Sometimes P2320 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.
How much does it cost to fix P2320?
Replace an ignition coil — $150–$380; Repair coil wiring or connector — $80–$250; Replace spark plugs — $90–$250. Exact cost depends on the root cause, your vehicle and local labor rates — a proper diagnosis is the cheapest first step.
What does P2320 mean?
P2320 (Ignition Coil "G" Secondary Circuit) is stored when self-diagnostics detect abnormal readings or behaviour of the ignition system. It belongs to the powertrain (engine/transmission) category.
The module monitors this system continuously while driving. When readings fall outside the expected range for a defined number of drive cycles, it stores P2320 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.
What causes P2320?
- failed ignition coil or coil pack
- faulty ignition control circuit in the ECM
- damaged coil wiring or connector
- worn spark plugs or wrong plug gap
- moisture or oil in the spark plug wells
Common symptoms of P2320
- hard starting, especially in damp weather
- increased fuel consumption
- Check Engine Light on
- loss of power and jerking
- misfires under load or at idle
How to diagnose P2320
- Connect an OBD2 scanner, confirm P2320 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 P2320 does not return.
How to fix P2320
Start with the cheapest and most common causes before replacing expensive parts:
- Replace an ignition coil — $150–$380
- Repair coil wiring or connector — $80–$250
- Replace spark plugs — $90–$250
How much does it cost to fix P2320?
Repair cost depends on which component actually failed. Typical scenarios for P2320 (parts and labor, USD, independent shop rates):
- Replace an ignition coil: $150–$380
- Repair coil wiring or connector: $80–$250
- Replace spark plugs: $90–$250
Overall, fixing P2320 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 P2320?
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.