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Engine-Codes – Ford – P0358 1999 Ford F150

P0358 1999 Ford F150 Code - Ignition Coil 'H' Primary/Secondary Circuit Malfunction

Quick Answer

The diagnostic trouble code P0358 for a 1999 Ford F150 indicates an issue with the Ignition Coil 'H' Primary/Secondary Circuit. Common causes include A faulty ignition coil for cylinder 'H', Damaged or corroded wiring/connectors in the ignition coil circuit, Issues with the engine control module (ECM). 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
P0358 1999 Ford F150 indicates Ignition Coil 'H' Primary/Secondary Circuit Malfunction.
Common causes
Common causes include A faulty ignition coil for cylinder 'H', Damaged or corroded wiring/connectors in the ignition coil circuit, Issues with the engine control module (ECM).
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 P0358 1999 Ford F150 Description

The diagnostic trouble code P0358 for a 1999 Ford F150 indicates an issue with the Ignition Coil 'H' Primary/Secondary Circuit. This code specifically points to a malfunction in the ignition coil for cylinder 'H', which can have significant implications for the vehicle's performance. 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 fuel-air mixture in the engine cylinders. When the ignition coil malfunctions, it can lead to misfires, rough idling, poor fuel efficiency, and even engine stalling.

OBDII Code P0358 1999 Ford F150 - Ignition Coil 'H' Primary/Secondary Circuit Malfunction
P0358 1999 Ford F150 Code - Ignition Coil 'H' Primary/Secondary Circuit Malfunction

Common Causes of P0358 1999 Ford F150

  1. A faulty ignition coil for cylinder 'H'.
  2. Damaged or corroded wiring/connectors in the ignition coil circuit.
  3. Issues with the engine control module (ECM).
  4. Extreme temperatures or environmental factors affecting the ignition coil.
  5. Normal wear and tear on the ignition coil over time.

Symptoms of P0358 1999 Ford F150

  1. Engine misfires or hesitation during acceleration.
  2. Rough idling or vibrations when the vehicle is stationary.
  3. Decreased fuel efficiency and overall performance.
  4. Illumination of the check engine light on the dashboard.
  5. Engine stalling or difficulty starting the vehicle.

How to Fix P0358 1999 Ford F150

  1. Begin by diagnosing the specific cause of the issue using a diagnostic scanner to confirm the P0358 code.
  2. Inspect the ignition coil for cylinder 'H' for any visible signs of damage or wear.
  3. Check the wiring and connectors in the ignition coil circuit for any breaks, corrosion, or loose connections.
  4. Test the ignition coil's primary and secondary circuits using a multimeter to determine if it is functioning correctly.
  5. If the ignition coil is found to be faulty, replace it with a new, high-quality part and ensure proper installation.

Cost to Fix P0358 1999 Ford F150

The typical repair costs for addressing the Ignition Coil 'H' Primary/Secondary Circuit Malfunction (P0358) in a 1999 Ford F150 can range from $150 to $300 for parts and labor. However, it's important 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. Auto repair shops commonly charge between $80 and $150 per hour for labor, with rates potentially higher in metropolitan areas or at dealerships, and lower at independent shops. For a more precise estimate, it's recommended to check local rates 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 P0358 1999 Ford F150 Code

1. What does the OBDII code P0358 mean on a 1999 Ford F150?

P0358 indicates a malfunction in the ignition coil "H" primary or secondary circuit, which refers to an issue with the eighth ignition coil or its associated wiring.

2. What are the symptoms of code P0358 in a 1999 Ford F150?

Common symptoms include engine misfires, rough idling, reduced power, hesitation during acceleration, and the check engine light turning on.

3. What causes the P0358 code in a 1999 Ford F150?

Possible causes include a faulty ignition coil, damaged spark plug, broken or corroded wiring, a bad coil connector, or a malfunctioning PCM (Powertrain Control Module).

4. How do I diagnose the P0358 code on my 1999 Ford F150?

Start by visually inspecting the ignition coil, wiring, and connectors for damage or corrosion. Use a multimeter to test the coil and check for continuity in the wiring. If necessary, swap the coil with another cylinder to see if the misfire moves.

5. Can I drive my 1999 Ford F150 with code P0358?

Driving with this code is not recommended, as it can cause further engine damage, reduced fuel efficiency, and performance issues due to misfiring.

6. How do I fix the P0358 code on a 1999 Ford F150?

Repairs may include replacing the faulty ignition coil, repairing or replacing damaged wiring or connectors, or replacing the spark plug associated with cylinder 8.

7. How much does it cost to fix the P0358 code on a 1999 Ford F150?

The cost depends on the repair needed. Replacing an ignition coil typically costs $50–$150 for the part, plus labor, while wiring or PCM repairs can vary widely.

8. Can a bad spark plug cause the P0358 code on a 1999 Ford F150?

Yes, a worn or damaged spark plug can overwork the ignition coil, leading to a malfunction and triggering the P0358 code.

9. What tools are needed to troubleshoot the P0358 code on a 1999 Ford F150?

You’ll need a scan tool to read and clear the code, a multimeter to test the ignition coil and wiring, and basic hand tools to remove and replace components.

10. Will a bad PCM cause the P0358 code on a 1999 Ford F150?

While rare, a faulty PCM can cause this code if it fails to properly control the ignition coil. This should be checked after ruling out other causes.

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