What does P0354 mean?

Ignition Coil D Primary/Secondary Circuit Malfunction Check Engine Light illumination, potential misfire, rough idle, loss of power under load

AutoFixDB - Free OBD-II diagnostic trouble code lookup. Find causes, symptoms, diagnostic steps and repair solutions.

Overview

P0354 refers to a malfunction in the primary or secondary circuit of ignition coil D, typically the coil on cylinder #4, where the PCM detects an electrical fault affecting ignition performance

Common Symptoms

Check Engine Light illuminated
Engine rough idle
Misfire on cylinder 4
Loss of acceleration or power
Intermittent hesitation

Most Common Causes

Faulty ignition coil D high

Primary and secondary circuit failure can trigger the code

Open or short in coil driver wiring high

Wiring breaks, shorts to ground, or shorts to voltage can disrupt circuit

Poor electrical connection at coil connector medium

Corroded pins or loose connectors can mimic circuit faults

Faulty powertrain control module (PCM) coil driver medium

Internal driver failure in the PCM can prevent proper coil activation

Faulty spark plug or related ignition component low

Secondary ignition issues can appear related but may not be primary fault

Diagnostic Steps

Verify P0354 is stored using OBD-II scanner

Expected: Code P0354 present in memory

Interpretation: Confirm code before proceeding
Visually inspect wiring and connectors at ignition coil D

Expected: Check for breaks, corrosion, loose pins

Interpretation: Damaged wiring/connectors often cause circuit codes
Test primary circuit voltage and continuity with multimeter

Expected: Approximately 12V on supply, continuity between PCM and coil

Interpretation: Open or short in wiring yields abnormal readings
Swap coil D with known good coil

Expected: Code follows coil if coil is faulty

Interpretation: Identifies defective coil vs wiring/PCM
If wiring and coil test normal, test PCM driver output or consider PCM replacement

Expected: No proper driver signal measured

Interpretation: Faulty PCM driver suspected

Repair Solutions

Replace faulty ignition coil D medium

Estimated Cost: $150 - $300

OEM or high‑quality aftermarket coil recommended

Repair or replace damaged wiring/connectors medium

Estimated Cost: $50 - $200

Cost varies with labor and extent of damage

Replace or reprogram PCM if driver circuit failed hard

Estimated Cost: $500 - $3000

PCM repairs are complex and vehicle specific

Replace faulty spark plug or secondary ignition components easy

Estimated Cost: $60 - $260

Helpful if secondary side contributing to misfire

Common Misdiagnoses

Avoid these common diagnostic mistakes:

Replacing ignition coil without checking wiring/connectors
Incorrectly attributing to vacuum leaks or fuel system issues

Frequently Asked Questions

What does the P0354 code mean?

Technically, the P0354 code represents Ignition Coil D Primary/Secondary Circuit Malfunction. It usually points to a fault within the Ignition.

Can P0354 cause engine damage?

With a severity level of medium, check Engine Light illumination, potential misfire, rough idle, loss of power under load

What are the symptoms of P0354?

Common symptoms include: Check Engine Light illuminated, Engine rough idle, Misfire on cylinder 4. You might also notice the Check Engine Light is on.

Potential causes for OBDII code P0354

This code is frequently triggered by: Faulty ignition coil D, Open or short in coil driver wiring, Poor electrical connection at coil connector.

Repair cost breakdown for P0354

Expect to pay around $200 if the issue is a Repair or replace damaged wiring/connectors, but up to $3000 if the Replace or reprogram PCM if driver circuit failed needs replacement.

Does P0354 affect Ford, Toyota, or Honda?

This is a universal code. You might see P0354 on Ford, Chevrolet, Toyota, Honda, Nissan, or any other OBD-II vehicle.

P0354: Ignition Coil D Primary/Secondary Circuit Malfunction