What Does P2308 Mean?
The PCM has detected a fault in the secondary (high voltage) circuit of ignition coil C. This indicates problems with spark delivery, coil secondary winding, or spark plug circuit.
Common Causes
40%
Failed ignition coil C with damaged secondary winding
25%
Carbon tracking or spark leakage on coil C tower or boot
20%
Worn or fouled spark plug in cylinder C
15%
High resistance in secondary circuit due to damaged plug wire or excessive plug gap
Diagnostic Steps
1
Step 1: Visually inspect ignition coil C for cracks, carbon tracking, or oil contamination on tower and boot
2
Step 2: Remove and inspect spark plug for proper gap, wear, fouling, or damage
3
Step 3: Test secondary winding resistance in ignition coil C and compare to manufacturer specifications
4
Step 4: Use spark tester to verify spark intensity and consistency under load
5
Step 5: Replace ignition coil C and/or spark plug based on test results and visual inspection
Estimated Repair Cost
$120 - $350
Parts + labor, varies by vehicle and location
The PCM has detected a fault in the secondary (high voltage) circuit of ignition coil C. This indicates problems with spark delivery, coil secondary winding, or spark plug circuit.
The most common cause of P2308 (Ignition Coil "C" Secondary Circuit) is: Failed ignition coil C with damaged secondary winding
Typical repair costs for P2308 range from $120 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Misfire on cylinder C will cause rough idle, hesitation, and reduced performance. Continued operation can result in catalytic converter damage from unburned fuel.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2308 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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