Home›Trouble Codes›P0355

P0355 — Ignition Coil E Primary Control Circuitopen

Generic OBD-II · all makesPowertrain (engine & transmission)

P0355 indicates a problem with the primary control circuit of ignition coil E, meaning the coil is not receiving the proper voltage from the engine control module. The code is set when the PCM detects an open or short in that circuit.

Symptoms

What causes it — most likely first

1. Failed ignition coil E

The coil's internal windings or driver circuit can fail, creating an open circuit that triggers the code.

2. Open or short in primary control wiring or connector

A broken wire, loose terminal, or corrosion in the wiring harness or connector can interrupt the signal to the coil.

3. Corroded or loose electrical connector at coil E

Oxidation or poor contact at the coil's connector can prevent proper voltage delivery.

4. Faulty powertrain control module (PCM) output

Rarely, the PCM may not send the correct signal to the coil driver, but this is usually the last consideration.

5. Excessive resistance or voltage drop in coil circuit

High resistance in the wiring or coil can mimic an open circuit and set the code.

How it's diagnosed

  1. Visually inspect coil E, wiring, and connector for damage, corrosion, or looseness
  2. Measure coil primary resistance with a multimeter and compare to specifications
  3. Check for voltage at the coil driver connector while cranking the engine
  4. Swap coil E with a known good coil to see if the code follows the coil
  5. Perform continuity and resistance tests on the wiring harness and connector pins
  6. If all hardware checks are clear, evaluate PCM output using a scan tool or oscilloscope

Code facts & related codes

SystemPowertrain (engine & transmission)
StandardizationSAE generic — identical on every make
Related codesP0350 — Ignition Coil Primarysecondary CircuitP0351 — Ignition Coil Primary Control CircuitoP0352 — Ignition Coil B Primary Control CircuiP0353 — Ignition Coil C Primary Control CircuiP0354 — Ignition Coil D Primary Control CircuiP0356 — Ignition Coil F Primary Control Circui

Frequently asked

Will replacing the ignition coil fix the P0355 code?

Often yes, because the coil itself is the most common failure point.

Do I need to replace the PCM if I get a P0355?

Usually not; PCM failure is rare and is considered only after wiring and coil checks are clear.

Can a bad spark plug cause this code?

No, P0355 relates to the coil's electrical circuit, not the spark plug condition.

Is it safe to drive with a P0355?

The vehicle may run roughly and could stall; it's best to address the issue promptly to avoid engine damage.