What Does P2311 Mean?
The PCM has detected an abnormal voltage or signal condition in the secondary (high voltage) circuit of ignition coil D. This affects the spark delivery to the corresponding cylinder.
Common Causes
45%
Faulty ignition coil D with internal secondary winding failure
25%
Damaged or arcing spark plug or spark plug wire on cylinder D
15%
Corroded or loose connector at ignition coil D
10%
High resistance in secondary ignition circuit wiring
5%
PCM internal driver circuit failure
Diagnostic Steps
1
Step 1: Visually inspect ignition coil D, spark plug wire, and boot for physical damage, cracks, or carbon tracking
2
Step 2: Swap ignition coil D with another cylinder and clear codes; if code follows the coil, replace it
3
Step 3: Remove and inspect spark plug D for excessive wear, fouling, or incorrect gap
4
Step 4: Test secondary resistance of coil D and compare to manufacturer specifications
5
Step 5: Check connector terminals at coil D for corrosion, damage, or poor contact
Estimated Repair Cost
$100 - $350
Parts + labor, varies by vehicle and location
The PCM has detected an abnormal voltage or signal condition in the secondary (high voltage) circuit of ignition coil D. This affects the spark delivery to the corresponding cylinder.
The most common cause of P2311 (Ignition Coil "D" Secondary Circuit) is: Faulty ignition coil D with internal secondary winding failure
Typical repair costs for P2311 range from $100 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
May cause engine misfires, rough running, and reduced power. Continued operation can damage the catalytic converter.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P2311 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.
