AutoCodes – Toyota – P0355 2003 Toyota Highlander

P0355 2003 Toyota Highlander Code - Ignition Coil 5 Primary/Secondary Circuit

Quick Answer

The ignition system on the vehicle uses individual ignition coils for each cylinder. Common causes include Faulty Ignition Coil 5, Ignition Coil 5 harness is open or shorted, Ignition Coil 5 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: P0355 2003 Toyota Highlander indicates Ignition Coil 5 Primary/Secondary Circuit.
Common causes: Common causes include Faulty Ignition Coil 5, Ignition Coil 5 harness is open or shorted, Ignition Coil 5 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 2,656

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 P0355 2003 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 P0355 2003 Toyota Highlander - Ignition Coil 5 Primary/Secondary Circuit - AutoCodes.com — P0355 2003 Toyota Highlander Code - Ignition Coil 5 Primary/Secondary Circuit

What does this mean?

What are the Possible Causes of the DTC P0355 2003 Toyota Highlander?

Faulty Ignition Coil 5
Ignition Coil 5 harness is open or shorted
Ignition Coil 5 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0355 2003 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 P0355 2003 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 P0355 2003 Toyota Highlander code?

Need more information on how to fix the P0355 2003 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 P0355 2003 Toyota Highlander Code

1. What does the OBDII code P0355 mean on a 2003 Toyota Highlander?

Code P0355 indicates a malfunction in the Ignition Coil 5 Primary/Secondary Circuit, meaning the engine control module (ECM) has detected an issue with the ignition coil for cylinder 5.

2. What are the symptoms of code P0355 in a 2003 Toyota Highlander?

Common symptoms include engine misfires, reduced engine performance, rough idling, poor fuel economy, and the Check Engine Light turning on.

3. What causes code P0355 in a 2003 Toyota Highlander?

Possible causes include a faulty ignition coil, damaged or corroded wiring, a bad spark plug, a malfunctioning ECM, or a loose or disconnected ignition coil connector.

4. Can I drive my 2003 Toyota Highlander with code P0355?

Driving with code P0355 is not recommended, as it can lead to further engine damage, reduced performance, and increased fuel consumption due to misfires.

5. How can I diagnose code P0355 on a 2003 Toyota Highlander?

Start by inspecting the ignition coil and its wiring for damage or loose connections. Use a multimeter to test the ignition coil and wiring continuity, or swap the ignition coil with another cylinder to see if the code follows.

6. How do I fix code P0355 in a 2003 Toyota Highlander?

Repairs may include replacing the faulty ignition coil, repairing or replacing damaged wiring, replacing spark plugs, or reprogramming or replacing the ECM if necessary.

7. How much does it cost to fix code P0355 on a 2003 Toyota Highlander?

Replacing an ignition coil typically costs between $100 and $250, depending on labor rates and part prices. Additional costs may apply if wiring repairs or ECM replacement is needed.

8. Can a bad spark plug cause code P0355 in a 2003 Toyota Highlander?

Yes, a bad spark plug can cause excessive load on the ignition coil, potentially triggering code P0355.

9. What tools do I need to diagnose code P0355 on a 2003 Toyota Highlander?

Youâ€™ll need an OBDII scanner, a multimeter, and basic hand tools to inspect and test the ignition coil and wiring.

10. How can I prevent code P0355 in the future?

Regular maintenance, including timely replacement of spark plugs and ignition coils, and inspecting wiring for wear or corrosion, can help prevent this issue.