What Does P2335 Mean?
Ignition Coil 'L' Secondary Circuit indicates the ECM detected an abnormal condition in the high-voltage secondary circuit of ignition coil L (cylinder 12). The coil is not delivering adequate spark energy, which could be due to a failed coil, worn spark plug, or compromised insulation in the secondary path.
Common Causes
40%
Ignition coil L secondary winding failure (open or shorted turns)
25%
Worn or fouled spark plug on cylinder 12
20%
Carbon tracking or deteriorated coil boot allowing voltage leak
15%
Oil or moisture in the spark plug well causing insulation breakdown
Diagnostic Steps
1
Step 1: Check Mode $06 misfire data for cylinder 12 to confirm active misfiring correlating with this code.
2
Step 2: Remove coil L and carefully inspect the boot for carbon tracks, burn marks, or physical damage.
3
Step 3: Pull the cylinder 12 spark plug and evaluate electrode wear, gap, and overall condition. Replace if out of specification.
4
Step 4: Check the spark plug well for oil or coolant. Address the source of contamination before replacing ignition components.
5
Step 5: Swap coil L with a known-good coil, clear codes, and test drive to confirm the faulty component.
Estimated Repair Cost
$80 - $400
Parts + labor, varies by vehicle and location
Ignition Coil 'L' Secondary Circuit indicates the ECM detected an abnormal condition in the high-voltage secondary circuit of ignition coil L (cylinder 12). The coil is not delivering adequate spark energy, which could be due to a failed coil, worn spark plug, or compromised insulation in the second...
The most common cause of P2335 (Ignition Coil "L" Secondary Circuit) is: Ignition coil L secondary winding failure (open or shorted turns)
Typical repair costs for P2335 range from $80 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Misfire on cylinder 12 causes rough running and may trigger the catalytic converter overheat protection. Avoid sustained high-load driving.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2335 to identify the root cause.
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Quick Info
Category
Powertrain
System
Ignition System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
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