What Does P1394 Mean?
The engine control module has detected an electrical fault in the power output stage for ignition coil #2. This represents a malfunction in the ECM's driver circuit or the coil's primary circuit for cylinder #2.
Common Causes
40%
Failed ignition coil #2 with internal electrical fault
25%
Damaged or shorted wiring between ECM and coil #2
15%
Failed ECM ignition driver circuit for coil #2
12%
Corroded or oil-contaminated connector at ignition coil
8%
Faulty spark plug causing excessive load on coil output stage
Diagnostic Steps
1
Step 1: Verify spark output from coil #2 using dedicated spark tester
2
Step 2: Measure coil #2 primary and secondary winding resistance; compare to specifications
3
Step 3: Inspect wiring harness and connector for damage, shorts, or corrosion
4
Step 4: Monitor ECM trigger signal to coil #2 using oscilloscope during cranking/running
5
Step 5: Swap coil #2 with known good coil to verify if fault is coil-related or circuit-related
Estimated Repair Cost
$100 - $800
Parts + labor, varies by vehicle and location
The engine control module has detected an electrical fault in the power output stage for ignition coil #2. This represents a malfunction in the ECM's driver circuit or the coil's primary circuit for cylinder #2.
The most common cause of P1394 (Ignition Coil Power Output Stage 2 Electrical Malfunction) is: Failed ignition coil #2 with internal electrical fault
Typical repair costs for P1394 range from $100 to $800, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Cylinder #2 misfire will cause rough idle, reduced power, and potential catalytic converter damage if driven extensively. Safe for short-distance driving to repair facility.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1394 to identify the root cause.
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Quick Info
Category
Powertrain
System
Ignition System
Difficulty
Type
Manufacturer
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