AutoCodes – Audi – P0354 Audi

P0354 Audi Code - Ignition Coil 4 Primary/Secondary Circuit

Quick Answer

The ignition system on the vehicle uses individual ignition coils for each cylinder. Common causes include Faulty Ignition Coil 4, Ignition Coil 4 harness is open or shorted, Ignition Coil 4 circuit poor electrical connection. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P0354 Audi indicates Ignition Coil 4 Primary/Secondary Circuit.
Common causes: Common causes include Faulty Ignition Coil 4, Ignition Coil 4 harness is open or shorted, Ignition Coil 4 circuit poor electrical connection.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 14,831

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Intermediate (2 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P0354 Audi Description

The ignition system on the vehicle uses individual ignition coils for each cylinder. The Engine Control Module (ECM) controls each ignition coil operation. The ECM sends a ON/OFF signal to energize the ignition coil to create a spark at the spark plug when a spark is required at the cylinder.

OBDII Code P0354 Audi - Ignition Coil 4 Primary/Secondary Circuit - AutoCodes.com — P0354 Audi Code - Ignition Coil 4 Primary/Secondary Circuit

What does this mean?

What are the Possible Causes of the DTC P0354 Audi?

Faulty Ignition Coil 4
Ignition Coil 4 harness is open or shorted
Ignition Coil 4 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0354 Audi?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0354 Audi code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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Need more information on how to fix the P0354 Audi code? Get Access to Factory Service Manuals

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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P0354 Audi Code

1. What does the OBDII code P0354 mean on an Audi?

P0354 indicates an issue with the ignition coil 4 primary or secondary circuit, which could affect cylinder 4's ability to ignite properly.

2. What are the symptoms of code P0354 on an Audi?

Common symptoms include engine misfires, poor acceleration, rough idling, decreased fuel efficiency, and possibly an illuminated check engine light.

3. What causes the P0354 code on an Audi?

Possible causes include a faulty ignition coil, damaged wiring or connectors in the ignition coil circuit, a malfunctioning spark plug, or issues with the ECU.

4. Can I drive my Audi with the P0354 code?

It is not recommended to drive with this code, as misfires can cause further damage to the engine or catalytic converter and lead to more expensive repairs.

5. How do I diagnose the P0354 code on my Audi?

Start by inspecting the ignition coil 4 and its wiring for visible damage. Use a multimeter to check the resistance of the coil and test the circuit. Swap the coil with another cylinder to see if the problem follows.

6. How do I fix the P0354 code on an Audi?

Repairs may include replacing the ignition coil, repairing damaged wiring, replacing the spark plug for cylinder 4, or reprogramming/updating the ECU if necessary.

7. How much does it cost to fix the P0354 code?

Repair costs can range from $100 to $300, depending on whether you need to replace the ignition coil, wiring, or spark plug. ECU repairs or updates may cost more.

8. Can a bad spark plug cause the P0354 code on an Audi?

Yes, a faulty or worn spark plug in cylinder 4 can cause ignition issues that trigger the P0354 code.

9. Will clearing the P0354 code fix the issue?

Clearing the code without addressing the underlying problem will not fix the issue. The code will likely return until the root cause is resolved.

10. How do I prevent the P0354 code from appearing again?

Regular maintenance, such as replacing spark plugs and ignition coils as recommended and inspecting wiring for damage, can help prevent this code from recurring.