Ignition Coil Primary Control Circuit High Voltage
Code P2319 indicates that the powertrain control module (PCM) has detected a voltage higher than expected in the primary control circuit of a specific ignition coil. This circuit controls the switching of the coil's primary winding to generate spark. A high voltage condition can result from a short to power, a faulty ignition coil, or a problem with the PCM driver. This code is often accompanied by misfires and poor engine performance.
1. Most Common Causes
- Short circuit in the primary circuit wiring of ignition coil 'G' to battery voltage (Vbat) or another high-voltage circuit
- Excessive resistance or poor connection in the ground or signal return wire of the primary circuit
- Internally damaged ignition coil 'G' with deteriorated insulation in the primary winding
- Internal failure of the engine control module (ECM/PCM) in the corresponding ignition control driver
- Corroded, oxidized, or damaged pins in the ignition coil or ECM connector causing erroneous voltage readings
2. Symptoms You Will Notice
- Engine misfire
- Check Engine Light illuminated
- Rough idle or hesitation during acceleration
3. Step-by-Step Diagnosis
Step 1: Scan for additional codes and note the affected cylinder.
Step 2: Visually inspect the ignition coil and wiring for damage or shorts.
Step 3: Test the ignition coil primary resistance with a multimeter and compare to specs.
Step 4: Check for voltage at the coil control circuit with key on; should be battery voltage when commanded off.
Step 5: If wiring and coil are good, suspect a faulty PCM and perform further diagnostics.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended as it can cause misfires, reduced fuel economy, and potential damage to the catalytic converter.
How much does it cost to fix?▼
Typically $150-$300 for parts and labor, depending on the cause and vehicle.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.