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P0357 2003 Ford F150 Code - Ignition Coil 'G' Primary/Secondary Circuit Malfunction

Quick Answer

The P0357 code for a 2003 Ford F150 indicates a malfunction in the ignition coil 'G' primary/secondary circuit. Common causes include Faulty ignition coil 'G', Wiring issues such as damaged or corroded wires, Problems with the ignition control module. 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
P0357 2003 Ford F150 indicates Ignition Coil 'G' Primary/Secondary Circuit Malfunction.
Common causes
Common causes include Faulty ignition coil 'G', Wiring issues such as damaged or corroded wires, Problems with the ignition control module.
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 12, 2024
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Code P0357 2003 Ford F150 Description

The P0357 code for a 2003 Ford F150 indicates a malfunction in the ignition coil 'G' primary/secondary circuit. The ignition coil is a crucial component of the vehicle's 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. The primary circuit controls the current flow to the coil, while the secondary circuit is responsible for delivering the high voltage spark to the spark plugs.

OBDII Code P0357 2003 Ford F150 - Ignition Coil 'G' Primary/Secondary Circuit Malfunction
P0357 2003 Ford F150 Code - Ignition Coil 'G' Primary/Secondary Circuit Malfunction

Common Causes of P0357 2003 Ford F150

  1. Faulty ignition coil 'G'
  2. Wiring issues such as damaged or corroded wires
  3. Problems with the ignition control module
  4. Issues with the powertrain control module (PCM)
  5. Poor electrical connection to the ignition coil 'G'

Symptoms of P0357 2003 Ford F150

  1. Engine misfires
  2. Rough idling
  3. Decreased fuel efficiency
  4. Difficulty starting the engine
  5. Illumination of the check engine light

How to Fix P0357 2003 Ford F150

  1. Begin by conducting a visual inspection of the wiring leading to the ignition coil 'G' to check for any visible damage or corrosion. Replace any damaged wires.
  2. Test the ignition coil 'G' with a multimeter to determine if it is functioning properly. If it is faulty, replace the ignition coil.
  3. Check and test the ignition control module to ensure it is sending the proper signals to the ignition coil 'G'. Replace if necessary.
  4. If the issue persists, consider testing the powertrain control module (PCM) for any faults related to the ignition system.

Cost to Fix P0357 2003 Ford F150

The typical repair costs for addressing a P0357 code on a 2003 Ford F150 can range from $150 to $400, depending on the specific cause of the issue and the cost of parts and labor. It's important to note that prices can vary significantly based on factors such as location, vehicle make and model, and the specific repair shop. Diagnostic time and labor rates at auto repair shops can range from $80 to $150 per hour, with rates potentially higher at dealerships or in metropolitan areas. It's advisable to obtain quotes from multiple shops to ensure a fair price for the repair.

What does this mean?

Tech Notes for P0357 2003 Ford F150

Each ignition primary circuit is continuously monitored. The test fails when the PCM does not receive a valid IDM pulse signal from the ignition module (integrated in PCM).

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 P0357 2003 Ford F150 Code

1. What does the OBDII code P0357 mean on a 2003 Ford F150?

P0357 indicates an Ignition Coil 'G' Primary/Secondary Circuit Malfunction, meaning the PCM has detected a problem in the coil circuit for cylinder #7.

2. What are the symptoms of code P0357 on a 2003 Ford F150?

Common symptoms include engine misfires, rough idling, poor acceleration, decreased fuel efficiency, and the Check Engine Light turning on.

3. What causes the P0357 code on a 2003 Ford F150?

Possible causes include a faulty ignition coil, damaged wiring or connectors in the coil circuit, a bad spark plug, or a malfunctioning PCM.

4. How do I identify which ignition coil is cylinder #7 on a 2003 Ford F150?

In the 5.4L V8 engine, cylinder #7 is located on the driver's side, second cylinder from the back.

5. Can a faulty spark plug cause the P0357 code?

Yes, a faulty or worn spark plug can cause ignition coil issues, leading to the P0357 code.

6. How can I fix the P0357 code on my 2003 Ford F150?

Start by inspecting and replacing the ignition coil on cylinder #7 if needed, along with checking for damaged wiring or connectors. Replace the spark plug if it's worn or faulty.

7. Is it safe to drive with a P0357 code on a 2003 Ford F150?

Driving with this code is not recommended, as it can lead to poor performance, increased emissions, and potential engine damage over time.

8. How do I test the ignition coil for cylinder #7?

You can swap the ignition coil with another cylinder and see if the code follows. If the code changes to a different cylinder, the coil is likely faulty.

9. Could the PCM cause the P0357 code on a 2003 Ford F150?

Yes, although rare, a malfunctioning PCM or a software issue can cause this code if all other components check out.

10. Will clearing the P0357 code fix the issue on a 2003 Ford F150?

Clearing the code will turn off the Check Engine Light temporarily, but the underlying problem must be fixed, or the code will return.

Discuss the causes and fixes for P0357 2003 Ford F150 OBDII Code

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  • Hi im . Tim. My question is. My obd 3 ys ago read a lean code next misfire #6 cylinder so i changed coil pack with 3 still got misfie 6 reading plus ignition g open curcuit changed back just reading the g primary/ secondary 352 i think .now. 2001 f150 v8 4.6. Hope you understand my right to the point guestion. Check all basics,oil in pluge.etc

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