AutoCodes – Toyota – P0356 2006 Toyota Highlander

P0356 2006 Toyota Highlander Code - Ignition Coil 6 Primary/Secondary Circuit

Quick Answer

The ignition system on the vehicle uses individual ignition coils for each cylinder. Common causes include Faulty Ignition Coil 6, Ignition Coil 6 harness is open or shorted, Ignition Coil 6 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: P0356 2006 Toyota Highlander indicates Ignition Coil 6 Primary/Secondary Circuit.
Common causes: Common causes include Faulty Ignition Coil 6, Ignition Coil 6 harness is open or shorted, Ignition Coil 6 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 4,353

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 P0356 2006 Toyota Highlander 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 P0356 2006 Toyota Highlander - Ignition Coil 6 Primary/Secondary Circuit - AutoCodes.com — P0356 2006 Toyota Highlander Code - Ignition Coil 6 Primary/Secondary Circuit

What does this mean?

What are the Possible Causes of the DTC P0356 2006 Toyota Highlander?

Faulty Ignition Coil 6
Ignition Coil 6 harness is open or shorted
Ignition Coil 6 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0356 2006 Toyota Highlander?

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 P0356 2006 Toyota Highlander 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.

Need more information about the P0356 2006 Toyota Highlander code?

Need more information on how to fix the P0356 2006 Toyota Highlander code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 P0356 2006 Toyota Highlander Code

1. What does the OBDII code P0356 mean on a 2006 Toyota Highlander?

P0356 indicates an issue with the ignition coil circuit for cylinder 6, specifically in the primary or secondary circuit.

2. What are the symptoms of code P0356 in a 2006 Toyota Highlander?

Common symptoms include engine misfires, rough idling, reduced power, poor fuel economy, and the Check Engine Light illuminating.

3. What causes OBDII code P0356 to appear?

The most common causes are a faulty ignition coil, damaged wiring or connectors in the ignition coil circuit, a defective spark plug, or a malfunctioning Engine Control Module (ECM).

4. Can you drive a 2006 Toyota Highlander with code P0356?

Driving with this code is not recommended as it can cause further engine damage, reduced performance, and potential safety issues.

5. How do you diagnose code P0356 in a 2006 Toyota Highlander?

Diagnosis involves scanning the vehicle with an OBDII scanner, inspecting the ignition coil and its wiring, testing the coil with a multimeter, and checking the ECM for faults.

6. How do you fix the P0356 code on a 2006 Toyota Highlander?

Repairs may include replacing the faulty ignition coil, repairing or replacing damaged wiring, replacing the spark plug for cylinder 6, or reprogramming/repairing the ECM.

7. How much does it cost to fix code P0356 on a 2006 Toyota Highlander?

The cost varies, but replacing an ignition coil typically ranges from $150 to $300, including parts and labor. Additional repairs may increase costs.

8. Can a bad spark plug cause code P0356?

Yes, a bad spark plug in cylinder 6 can cause the ignition coil to malfunction, triggering the P0356 code.

9. Is it necessary to replace all ignition coils if code P0356 appears?

No, only the faulty coil in cylinder 6 needs to be replaced, but replacing all coils may be considered if they are old or prone to failure.

10. How can you prevent code P0356 from recurring?

Regular maintenance, such as inspecting and replacing spark plugs and ignition coils as needed, and checking for damaged wiring, can help prevent this issue.