What Does P1368 Mean?
The ECM has detected a malfunction in the secondary (high voltage) circuit of ignition coil D. This indicates a problem with spark delivery from this specific coil.
Common Causes
45%
Failed ignition coil with internal winding breakdown
25%
Faulty spark plug or damaged plug boot causing arcing
20%
Damaged spark plug wire or poor connection to coil
10%
ECM driver circuit failure
Diagnostic Steps
1
Step 1: Visually inspect ignition coil D, spark plug wire, and boot for carbon tracking, cracks, or damage
2
Step 2: Swap ignition coil D with another coil to determine if fault follows the coil
3
Step 3: Test secondary resistance of coil D (typically 6,000-15,000 ohms)
4
Step 4: Inspect spark plug condition and gap on cylinder served by coil D
5
Step 5: Check primary coil circuit voltage and ground integrity
Estimated Repair Cost
$100 - $350
Parts + labor, varies by vehicle and location
The ECM has detected a malfunction in the secondary (high voltage) circuit of ignition coil D. This indicates a problem with spark delivery from this specific coil.
The most common cause of P1368 (Ignition Coil D Secondary Circuit Malfunction) is: Failed ignition coil with internal winding breakdown
Typical repair costs for P1368 range from $100 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Causes misfire on one cylinder, reduced power, and increased emissions. Safe to drive short distances but may cause catalytic converter damage if driven extensively.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1368 to identify the root cause.
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Quick Info
Category
Powertrain
System
Ignition System
Difficulty
Type
Manufacturer
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