TorqueMech OBD Code Guide
P0355 - Ignition Coil E Primary/Secondary Circuit
The ECM detected a fault in ignition coil E primary or secondary circuit.
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Check likely system
Estimate after confirmation
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Common Next Steps
Turn the code into the next check.
Inspect ignition coils
Check coil boots, carbon tracking, and whether the miss follows a swap.
Check spark plugs
Inspect gap, fouling, wear, oil, coolant, and plug-well condition.
Verify injector operation
Move to injector balance, pulse, or leak-down checks if the misfire stays.
Check compression if needed
Use compression or leak-down testing when spark and fuel checks do not move the fault.
Code Overview
The ECM detected a fault in ignition coil E primary or secondary circuit.
Common Causes
- Failed ignition coil E
- Damaged wiring or connector at coil E
- Driver circuit fault
Diagnostic Steps
- Inspect the coil E connector and wiring
- Check coil power, ground, and trigger operation
- Confirm the fault follows the coil before replacing parts
Related OBD Codes
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Next Steps
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