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Engine-Codes – Toyota – P0355 2003 Toyota Highlander

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

Quick Answer

The P0355 diagnostic trouble code (DTC) for a 2003 Toyota Highlander indicates a problem with the ignition coil 5 primary/secondary circuit. Common causes include Faulty ignition coil, Wiring issues in the ignition coil circuit, ECM malfunction. 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, Wiring issues in the ignition coil circuit, ECM malfunction.
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 17, 2024
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Code P0355 2003 Toyota Highlander Description

The P0355 diagnostic trouble code (DTC) for a 2003 Toyota Highlander indicates a problem with the ignition coil 5 primary/secondary circuit. The ignition coil is a crucial component of the ignition system, responsible for converting the low voltage from the battery into the high voltage needed to ignite the air-fuel mixture in the engine's cylinders. In this case, the code specifically points to an issue with the circuit associated with ignition coil 5, which could lead to misfires, poor engine performance, and potential long-term damage if left unresolved.

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

Common Causes of P0355 2003 Toyota Highlander

  1. Faulty ignition coil
  2. Wiring issues in the ignition coil circuit
  3. ECM malfunction
  4. Electrical connection problems
  5. Spark plug issues

Symptoms of P0355 2003 Toyota Highlander

  1. Engine misfires
  2. Rough idling
  3. Hesitation or lack of power during acceleration
  4. Check Engine Light illuminated
  5. Reduced fuel efficiency

How to Fix P0355 2003 Toyota Highlander

  1. Diagnose the specific cause of the issue by using a scan tool to read the DTC and perform further testing if necessary.
  2. Inspect the wiring and connections associated with ignition coil 5 to identify any damage or loose connections.
  3. Test the ignition coil 5 for proper function using a multimeter to check for resistance and continuity.
  4. Replace the faulty ignition coil if it fails the testing procedures, ensuring to install a new, high-quality part to prevent future issues.
  5. Clear the DTC and test drive the vehicle to confirm that the repair has resolved the problem and that the engine operates smoothly.

Cost to Fix P0355 2003 Toyota Highlander

The typical repair costs for addressing the P0355 code on a 2003 Toyota Highlander can range from $150 to $300, including parts and labor. However, it's essential to note that specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Most auto repair shops charge between $80 and $150 per hour for labor, with rates potentially higher in metropolitan areas or at dealerships and lower at independent shops. To obtain a more accurate estimate, it's recommended to inquire about local rates and get multiple quotes before proceeding with the repair.

When is the Code Detected?

Each ignition circuit is continuously monitored by the Engine Control Module (ECM). The test fails when the ECM does not receive a valid pulse signal from the ignition coil.

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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?

You’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.

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