What Does P2323 Mean?
The PCM has detected a fault in the secondary (high voltage) circuit of ignition coil H (typically cylinder 8). This indicates spark plug, coil tower, or secondary winding issues.
Common Causes
35%
Faulty or worn spark plug for cylinder 8
30%
Ignition coil H secondary winding failure or internal breakdown
20%
Carbon tracking or cracked coil boot/tower
10%
Excessive spark plug gap or wrong plug specification
5%
High resistance in spark plug wire or coil spring contact
Diagnostic Steps
1
Step 1: Remove and inspect spark plug for cylinder 8 for wear, fouling, or incorrect gap
2
Step 2: Inspect ignition coil H boot and tower for carbon tracking, cracks, or oil contamination
3
Step 3: Measure secondary coil resistance (typically 6,000-15,000 ohms depending on manufacturer)
4
Step 4: Perform spark intensity test using spark tester on cylinder 8
5
Step 5: Replace spark plug and retest; if code persists, replace ignition coil H
Estimated Repair Cost
$100 - $400
Parts + labor, varies by vehicle and location
The PCM has detected a fault in the secondary (high voltage) circuit of ignition coil H (typically cylinder 8). This indicates spark plug, coil tower, or secondary winding issues.
The most common cause of P2323 (Ignition Coil "H" Secondary Circuit) is: Faulty or worn spark plug for cylinder 8
Typical repair costs for P2323 range from $100 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Causes cylinder 8 misfire leading to rough idle, poor acceleration, and increased emissions. Prolonged operation may damage catalytic converter.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2323 to identify the root cause.
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Quick Info
Category
Powertrain
System
Ignition System
Difficulty
Type
Generic (SAE)
Recommended Tools
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