English-first OBD-II diagnostics Static, fast, focused lookup pages
CD CheckDTC Garage-grade fault lookup
Open P0300 Try AI Diagnose
Home / Codes / P0355
DTC code page

P0355: Ignition Coil E Primary/Secondary Circuit

Quick answer: The ECU detected an ignition-coil circuit fault on coil E, commonly used on five- and six-cylinder engines.

Drivers also search this fault as coil E circuit fault, P0355 ignition coil E, cylinder 5 coil circuit.

Severity: high Family: powertrain Related paths: 8
Meaning

What P0355 usually means

P0355 expands the same ignition-circuit family into engines with more than four coils. The pattern is the same: the ECU sees an electrical issue with the E coil path, which may map to cylinder 5 on many engines but should always be confirmed against the manufacturer's layout.

Fast triage

Start here before chasing parts

  • Scan first: save freeze-frame and pending codes before clearing anything.
  • Confirm the complaint: compare the stored code with current drivability symptoms.
  • Use context: trims, live data, and related codes usually narrow the fault faster than guesswork.
  • Work simplest to hardest: leaks, connectors, maintenance items, and known patterns before expensive components.
Initial checks

What to check first

  • Confirm that coil E corresponds to the expected cylinder on this engine family.
  • Inspect recent tune-up work if the code appeared shortly after plugs or coils were serviced.
  • Check whether the engine has a matching cylinder-specific misfire code that strengthens the diagnosis.
Driving risk

Can you keep driving?

P0355 can still allow limited light driving if symptoms are mild, but six-cylinder engines can feel deceptively smooth while still sending raw fuel into the catalyst. Diagnose it soon.

High urgency: If symptoms are active, reduce driving and diagnose quickly before secondary damage builds.
Likely causes

Common causes behind this code

  • Failed ignition coil on the E circuit
  • Damaged connector or weak terminal contact at the coil
  • Spark plug wear or boot arcing causing repeat coil overload
  • Open, short, or high resistance in the E control circuit
  • Rare driver failure in the control module

Cause phrases often tied to this code: coil E, cylinder 5 coil, wiring harness, plug wear, ignition driver.

Diagnostic order

Suggested workflow

  1. Map the E circuit to the correct cylinder using service information.
  2. Inspect the coil, boot, plug, and connector on that cylinder.
  3. Swap components where possible or use waveform testing to isolate the fault.
  4. Measure control-circuit integrity and verify the shared power feed under load.
  5. Confirm the fix on both idle and road-test conditions.
Avoid guesswork

Common mistakes

  • Assuming the fault must be the injector just because it is on a rear-bank or harder-to-reach cylinder.
  • Ignoring recent maintenance that may have pinched a connector or cracked a coil housing.
  • Skipping shared power-feed checks on engines with multiple coil codes.
Repair path

Practical fix guidance

  • Keep diagnosis cylinder-specific and evidence-based instead of replacing an entire bank of parts.
  • If the code followed a swapped coil, replace the coil and inspect the plug condition that may have stressed it.
  • If the code stayed put, focus on connector, feed, and driver-circuit validation.
Vehicle context

Affected brands in this MVP

Brand hubs help broaden internal linking now and can evolve into make-specific diagnostic notes later.

Aliases and common searches

English phrases tied to P0355

Useful when the driver knows the wording but not the exact DTC yet.

  • coil E circuit fault
  • P0355 ignition coil E
  • cylinder 5 coil circuit
Related search intent

Queries this page can answer naturally

  • P0355 code meaning
  • what does P0355 mean
  • coil E primary secondary fault
FAQ

Quick questions about P0355

Is P0355 common on V6 engines?

Yes. It often appears on engines where coil E maps to cylinder 5, though exact labeling varies by manufacturer.

Can recent spark plug work trigger P0355?

Yes. A damaged connector, cracked coil, wrong plug gap, or disturbed harness can all help set the code.

Why not just replace coil 5 and move on?

Because connector or wiring problems can look identical and cause the new coil to fail again.