What Does P2302 Mean?
The secondary ignition circuit for coil A has detected a fault, indicating problems with high-voltage output or spark delivery. This affects the coil's ability to produce sufficient spark voltage to fire the spark plug.
Common Causes
40%
Failed ignition coil secondary winding breakdown
25%
Faulty spark plug causing excessive resistance or gap
20%
Damaged spark plug wire or boot allowing spark to arc
10%
Carbon tracking on coil tower or distributor cap
5%
Incorrect spark plug gap or wrong plug type
Diagnostic Steps
1
Step 1: Remove and inspect spark plug A for wear, fouling, or excessive gap
2
Step 2: Test ignition coil secondary resistance and compare to specifications
3
Step 3: Inspect spark plug wire/boot for cracks, carbon tracking, or damage
4
Step 4: Perform spark test to verify adequate spark strength and color
5
Step 5: Swap coil A with another cylinder to determine if fault follows coil
Estimated Repair Cost
$80 - $400
Parts + labor, varies by vehicle and location
The secondary ignition circuit for coil A has detected a fault, indicating problems with high-voltage output or spark delivery. This affects the coil's ability to produce sufficient spark voltage to fire the spark plug.
The most common cause of P2302 (Ignition Coil "A" Secondary Circuit) is: Failed ignition coil secondary winding breakdown
Typical repair costs for P2302 range from $80 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Weak or absent spark causes cylinder misfire, rough running, and potential catalytic converter damage from unburned fuel. Reduced engine performance and fuel economy.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2302 to identify the root cause.
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Quick Info
Category
Powertrain
System
Ignition System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
