What it means
An electrical fault is detected in both the primary and the secondary circuit of ignition coil E. The ECU cannot drive the coil correctly, so the cylinder served by coil E misfires or does not fire at all. Causes: an open or shorted primary control wire, an internal coil winding fault, a failed igniter/driver, or wiring or connector damage at the coil.
At a glance
- Usually lights the check-engine light
- Affects emissions; the car can fail an emissions test
How it works
Coil E's primary circuit carries the switched current that lets the coil create the high voltage needed for its assigned cylinder's spark. The control module monitors the primary and secondary circuit response and sets P0355 when it detects an electrical fault in the coil E circuit, which can prevent that cylinder from firing.
Common causes
Most likely first.
- Ignition coil failed
- Wiring/connector fault
Symptoms
- Check engine light on or flashing
- Engine misfire or rough running
- Power loss or hesitation
- Hard starting
How to diagnose it
- Record freeze-frame data and check misfire counts with a scan tool to identify whether the coil E fault coincides with an affected cylinder.
- Inspect coil E and its connector for corrosion, loose or pushed-back pins, heat damage, or damaged insulation.
- Check the coil E supply and control wiring for opens or shorts to ground or supply, using the wiring diagram and manufacturer's specification.
- Test the coil E windings and, where applicable, its secondary path according to the manufacturer's procedure.
- If the coil and wiring pass, test the ignition driver output and control module connections for coil E.
Common fixes
- Reconnect or secure the coil E connector.
- Repair damaged wiring or corroded terminals in the coil E circuit.
- Replace coil E if its winding or secondary path fails testing.
- Repair the ignition driver circuit or replace the control module if testing confirms a driver fault.
Can I keep driving?
Avoid driving if the engine misfires severely or the check-engine light flashes, since an active misfire can damage the catalytic converter. If the light is steady and the engine runs normally, limit driving and arrange diagnosis soon.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.