AutoCodes – Buick – P0354 Buick

P0354 Buick Code - Ignition Coil 4 Control Circuit

Quick Answer

The ignition system on this engine uses ignition coils with integrated power transistors. 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 Buick indicates Ignition Coil 4 Control 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 3,925

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 16, 2022

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

The ignition system on this engine uses ignition coils with integrated power transistors. The Engine Control Module (ECM) controls the spark event for each cylinder through individual ignition coil control circuits. When the ECM commands the ignition control circuit On, electrical current flows through the primary winding of the ignition coil, creating a magnetic field. When a spark event is requested, the ECM commands the ignition control circuit Off, interrupting current flow through the primary winding. The collapsing magnetic field created by the primary winding induces a high voltage in the secondary winding, which is connected to the spark plugs. The Diagnostic Trouble Code (DTC) will be set when the control circuit commanded by the ECM state does not match the actual state.

OBDII Code P0354 Buick - Ignition Coil 4 Control Circuit - AutoCodes.com — P0354 Buick Code - Ignition Coil 4 Control Circuit

What does this mean?

What are the Possible Causes of the DTC P0354 Buick?

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 Buick?

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 Buick 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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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 Buick Code

1. What does the OBDII code P0354 mean on a Buick?

P0354 indicates a malfunction in the ignition coil 4 control circuit, which can affect engine performance and ignition timing.

2. What are the common symptoms of the P0354 code in a Buick?

Symptoms may include a rough idle, misfires, decreased fuel efficiency, lack of power, and the Check Engine light turning on.

3. What causes the P0354 code to appear in a Buick?

Common causes include a faulty ignition coil, damaged wiring or connectors in the coil circuit, a malfunctioning PCM (Powertrain Control Module), or loose electrical connections.

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

Driving with this code is not recommended as it can lead to poor engine performance, increased emissions, and potential damage to other components like the catalytic converter.

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

Start by inspecting the ignition coil, wiring, and connectors for damage or corrosion. Use a multimeter to test the coil and check for proper voltage and continuity in the circuit.

6. How do I fix the P0354 code on my Buick?

Repairs may involve replacing the faulty ignition coil, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the PCM if necessary.

7. What tools do I need to troubleshoot the P0354 code?

You'll need an OBDII scanner, a multimeter, and possibly a wiring diagram for your Buick to trace and test the ignition coil circuit.

8. How much does it cost to fix the P0354 code on a Buick?

Costs can vary, but replacing an ignition coil typically costs $50 to $150 for parts, plus labor. Additional repairs to wiring or the PCM may increase the cost.

9. Can a bad spark plug cause the P0354 code on a Buick?

While unlikely, a bad spark plug can cause misfires that mimic ignition coil issues. It's best to inspect the spark plug for cylinder 4 as part of the diagnostic process.

10. Will clearing the P0354 code fix the problem on my Buick?

Clearing the code without addressing the underlying issue will not fix the problem, and the code is likely to return. Proper diagnosis and repair are necessary.