What Does P0359 Mean?
The ECM has detected a malfunction in the primary or secondary circuit of ignition coil I, which serves cylinder #9 on engines with nine or more cylinders such as W12 or V10 configurations. This is an uncommon code typically found on high-performance or luxury vehicles. The coil driver feedback is abnormal, indicating the coil is not firing properly, resulting in a misfire on this cylinder.
Common Causes
40%
Failed ignition coil I with internal winding failure from high-performance engine thermal cycling
25%
Wiring or connector fault in the coil I circuit, difficult to access on large-displacement multi-cylinder engines
20%
Worn spark plug on cylinder 9 with excessive gap or carbon tracking on the insulator
15%
ECM coil driver failure for the cylinder 9 output channel
Diagnostic Steps
1
Swap coil I with an accessible coil from another cylinder position. Clear codes and drive to reproduce. If the fault moves with the coil, replace it.
2
Measure coil I primary and secondary resistance against manufacturer specifications. On multi-bank engines, compare readings across all coils for consistency.
3
Inspect the coil I wiring harness routing, which on V10 or W12 engines may pass through confined spaces with elevated temperatures and limited serviceability.
4
Check for oil contamination in the cylinder 9 spark plug well. On engines with this many cylinders, valve cover gasket leaks are common in hard-to-see areas.
5
Verify ECM trigger signal at the coil I driver wire using a labscope during cranking to confirm the ECM is commanding the coil properly.
Estimated Repair Cost
$80 - $400
Parts + labor, varies by vehicle and location
The ECM has detected a malfunction in the primary or secondary circuit of ignition coil I, which serves cylinder #9 on engines with nine or more cylinders such as W12 or V10 configurations. This is an uncommon code typically found on high-performance or luxury vehicles. The coil driver feedback is a...
The most common cause of P0359 (Ignition Coil I Primary/Secondary Circuit Malfunction) is: Failed ignition coil I with internal winding failure from high-performance engine thermal cycling
Typical repair costs for P0359 range from $80 to $400, depending on the vehicle, location, and whether you do it yourself or go to a shop.
A single cylinder misfire on a 9+ cylinder engine may be less noticeable but still causes power loss and increased emissions. Unburned fuel in the exhaust can damage the catalytic converter over time.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0359 to identify the root cause.
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Quick Info
Category
Powertrain
System
Ignition System
Difficulty
Type
Generic (SAE)
Recommended Tools
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