Ignition Coil L Primary/Secondary Circuit - No Activity
The P0368 code means the vehicle's onboard diagnostic system has detected: Ignition Coil L Primary/Secondary Circuit - No Activity. This is a moderate severity code.
- Keep driving?
- Short distances only
- DIY difficulty
- moderate
- Estimated cost
- $80 - $400 (parts and labor)
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Common Symptoms
- Check Engine Light illuminated
- Dead misfire on cylinder 12
- No spark
- V12 vibration
Probable Causes (Ranked by Likelihood)
- Dead ignition coil L Very High
- Open wiring High
- Disconnected connector Moderate
- PCM driver failure Low
Step-by-Step Diagnostic Procedure
-
Check connector.
-
Measure coil resistance.
-
Test PCM trigger signal.
-
Replace coil.
Frequently Asked Questions
What is the highest OBD-II ignition coil code?
P0368 (Coil L, Cylinder 12) is the highest standard ignition coil code in the OBD-II specification.
Can the PCM coil driver fail on cylinder 12?
It is possible but rare. PCM coil driver failures are far less common than coil or wiring failures.
Should I replace all 12 coils at once?
If one coil has failed and the others are original with high mileage, replacing all is recommended to prevent repeat shop visits.
Sources
This page is built from documented references. Verify against your own service info before repair work.
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