P2307 — Ignition Coil "C" Primary Control Circuit High
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 P2307 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 With the ignition coil "C" primary control disconnected, measure signal voltage at the harness connector: a high reading with the component unplugged indicates a short to power in the harness; if it drops to normal, the component itself is faulty.
- 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 P2307 does not return.
Approximate repair cost
Repair cost depends on which component actually failed. Typical scenarios for P2307 (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 P2307 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
What does OBD2 code P2307 mean?
Ignition Coil "C" Primary Control Circuit High (P2307): a powertrain (engine/transmission) fault affecting the ignition system. Short, gentle driving to a shop is usually possible. Most often caused by faulty ignition control circuit in the ECM, moisture or oil in the spark plug wells, failed ignition coil or coil pack.
How much does it cost to fix P2307?
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 P2307?
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.
Will P2307 clear itself?
Sometimes P2307 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 do I diagnose P2307 myself?
Start with a scan: confirm P2307, save the freeze frame and note any companion codes. Then inspect the wiring and connectors related to the ignition coil "C" primary control, and verify the suspect component against live data before buying parts.
What does P2307 mean?
The engine control module sets P2307 when it detects a fault in the ignition system. In practical terms: ignition coil "C" primary control circuit high. The code belongs to the powertrain (engine/transmission) group of OBD2 codes.
“Circuit high” means the control module sees a voltage on the ignition coil "C" primary control circuit that is above the expected range — typically close to battery voltage. Physically this points to a short to a power feed, a broken ground return, or a failed component pulling the signal line high.
The module monitors this system continuously while driving. When readings fall outside the expected range for a defined number of drive cycles, it stores P2307 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 P2307
- misfires under load or at idle
- increased fuel consumption
- hard starting, especially in damp weather
- Check Engine Light on
- loss of power and jerking
What causes P2307?
- signal wire shorted to battery positive
- failed ignition coil "C" primary control pulling the signal high
- open ground return of the ignition coil "C" primary control
- damaged coil wiring or connector
- worn spark plugs or wrong plug gap
- faulty ignition control circuit in the ECM
- failed ignition coil or coil pack
- moisture or oil in the spark plug wells
How to diagnose P2307
- Connect an OBD2 scanner, confirm P2307 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.
- With the ignition coil "C" primary control disconnected, measure signal voltage at the harness connector: a high reading with the component unplugged indicates a short to power in the harness; if it drops to normal, the component itself is faulty.
- 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 P2307 does not return.
How to fix P2307
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 P2307?
Repair cost depends on which component actually failed. Typical scenarios for P2307 (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 P2307 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 P2307?
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.