What Does P1384 Mean?
The ignition coil for cylinder 6 is firing too early in the combustion cycle. This indicates a timing issue with the coil driver circuit in the PCM or a faulty coil.
Common Causes
35%
Faulty ignition coil #6
30%
PCM internal coil driver circuit failure
20%
Wiring short to voltage in coil control circuit
10%
Poor ground connection at coil or PCM
5%
Damaged coil connector or terminals
Diagnostic Steps
1
Step 1: Swap cylinder 6 coil with another cylinder and monitor if fault code follows the coil
2
Step 2: Inspect wiring harness and connector at coil #6 for damage, corrosion, or shorts
3
Step 3: Use oscilloscope to monitor coil primary trigger signal for early activation or glitches
4
Step 4: Test ground circuits at coil and PCM for proper continuity and resistance
5
Step 5: If all external components test OK, suspect PCM coil driver circuit failure
Estimated Repair Cost
$150 - $1,200
Parts + labor, varies by vehicle and location
The ignition coil for cylinder 6 is firing too early in the combustion cycle. This indicates a timing issue with the coil driver circuit in the PCM or a faulty coil.
The most common cause of P1384 (Ignition Coil - Cylinder 6 - Early Activation Fault) is: Faulty ignition coil #6
Typical repair costs for P1384 range from $150 to $1,200, depending on the vehicle, location, and whether you do it yourself or go to a shop.
May cause engine misfire, rough running, and potential catalyst damage if driven extensively. Not immediately dangerous but should be repaired promptly.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1384 to identify the root cause.
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Quick Info
Category
Powertrain
System
Ignition System
Difficulty
Type
Manufacturer
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