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 circuit controls the coil's on/off switching to generate spark. High voltage can result from a faulty ignition coil, wiring issues, or a failing PCM. If left unresolved, it can cause misfires, reduced fuel economy, and potential catalytic converter damage.
1. Most Common Causes
- Faulty ignition coil
- Short to voltage in wiring or connector
- Damaged PCM or driver circuit
2. Symptoms You Will Notice
- Engine misfire or rough idle
- Check Engine Light illuminated
- Reduced power and fuel economy
3. 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 corrosion.
Step 3: Measure voltage at the coil primary circuit with a multimeter; compare to manufacturer specs.
Step 4: Swap the suspect coil with another cylinder and see if the code moves.
Step 5: If code persists, test the PCM output signal and check for shorts.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended. Driving with a misfire can damage the catalytic converter and reduce engine performance.
How much does it cost to fix?▼
Typical repair costs range from $150 to $300, including parts (ignition coil) and labor.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.