What Does P1383 Mean?
The engine control module has detected that the ignition coil for cylinder 5 is firing prematurely before the commanded ignition timing. This causes incorrect combustion timing and potential engine damage.
Common Causes
35%
Failed ignition coil with internal circuit defect causing early discharge
30%
ECM ignition driver circuit fault for cylinder 5
20%
Damaged wiring or corroded connector causing signal interference
10%
Incorrect ignition timing signals from crankshaft or camshaft sensors
5%
High resistance in coil ground circuit affecting trigger timing
Diagnostic Steps
1
Step 1: Inspect cylinder 5 ignition coil and connector for physical damage or corrosion
2
Step 2: Swap cylinder 5 ignition coil with another cylinder and retest to see if code follows coil
3
Step 3: Use oscilloscope to capture coil primary trigger signal and verify timing against crankshaft position
4
Step 4: Check all timing sensor signals (CKP and CMP) for accuracy and proper correlation
5
Step 5: Test ECM coil driver circuit output; if timing error persists with known-good coil, replace ECM
Estimated Repair Cost
$150 - $800
Parts + labor, varies by vehicle and location
The engine control module has detected that the ignition coil for cylinder 5 is firing prematurely before the commanded ignition timing. This causes incorrect combustion timing and potential engine damage.
The most common cause of P1383 (Ignition Coil - Cylinder 5 - Early Activation Fault) is: Failed ignition coil with internal circuit defect causing early discharge
Typical repair costs for P1383 range from $150 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Early ignition timing can cause engine knock, reduced power, and potential internal engine damage. Avoid heavy acceleration until repaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1383 to identify the root cause.
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Quick Info
Category
Powertrain
System
Ignition System
Difficulty
Type
Manufacturer
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