Ignition Coil Primary Control Circuit High Voltage
The P2328 code 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 typically points to a short to voltage, a faulty ignition coil, or an issue with the PCM driver circuit. The primary circuit controls the coil's charging and firing; excessive voltage can cause misfires and drivability issues.
01. Most Common Causes
- Faulty ignition coil
- Short to voltage in the primary control circuit
- Damaged PCM or wiring issue
02. Symptoms You Will Notice
- Engine misfire
- Check Engine Light on
- Rough idle or hesitation
03. Step-by-Step Diagnosis
Step 1: Scan for codes and note which cylinder is affected.
Step 2: Visually inspect the ignition coil and wiring for damage or shorts.
Step 3: Test the primary circuit voltage with a multimeter; compare to manufacturer specs.
Step 4: Swap the suspect coil with another cylinder; if code moves, replace the coil.
Step 5: If wiring and coil are good, test PCM output; consider PCM replacement if faulty.
04. Commonly Affected Makes
05. 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 catalytic converter damage.
How much does it cost to fix?▼
Typically $150-$300 including parts and labor, depending on the cause and vehicle.