Ignition Coil Primary Control Circuit High Voltage
The P2307 code indicates that the powertrain control module (PCM) has detected a voltage higher than expected in the primary circuit of a specific ignition coil. This circuit controls the coil's charge and discharge timing. A high voltage condition can be caused by a faulty ignition coil, wiring issues, or a problem with the PCM itself. This can lead to misfires, reduced engine performance, and increased emissions.
1. Most Common Causes
- Faulty ignition coil
- Short to voltage in the primary circuit wiring
- Damaged connector or corroded terminals
- Faulty PCM (rare)
2. Symptoms You Will Notice
- Engine misfire or rough idle
- Check Engine Light illuminated
- Reduced fuel economy
- Hesitation or stumbling during acceleration
3. Step-by-Step Diagnosis
Step 1: Use an OBD2 scanner to confirm the code and check for additional codes.
Step 2: Visually inspect the ignition coil and its wiring for damage, corrosion, or loose connections.
Step 3: Test the ignition coil primary resistance with a multimeter (specs vary by vehicle).
Step 4: Check for voltage at the coil connector with the ignition on; compare to manufacturer specifications.
Step 5: If wiring and coil are good, test the PCM output circuit or consult a professional.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with this code as it can cause misfires, poor performance, and potential damage to the catalytic converter.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for a DIY replacement of the ignition coil, or $100 to $300 if professionally diagnosed and repaired.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.