AutoCodes – Ford – P2318 Ford

P2318 Ford Code - Ignition Coil 'G' Primary Control Circuit Low

Quick Answer

The current flow, or dwell, through the primary ignition coil is controlled by the Powertrain Control Module (PCM) by providing a switched ground path through the ignition coil driver to ground. Common causes include Faulty Ignition Coil 'G', Ignition Coil 'G' harness is open or shorted, Ignition Coil 'G' 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
P2318 Ford indicates Ignition Coil 'G' Primary Control Circuit Low.
Common causes
Common causes include Faulty Ignition Coil 'G', Ignition Coil 'G' harness is open or shorted, Ignition Coil 'G' 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 1,382
How popular is this code, among other codes? Low
Table of contents Created and updated by William Orellana on Jun 14, 2020
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Code P2318 Ford Description

The current flow, or dwell, through the primary ignition coil is controlled by the Powertrain Control Module (PCM) by providing a switched ground path through the ignition coil driver to ground. When the ignition coil driver is switched on, current rapidly builds up to a maximum value, determined by the coil inductance and resistance. When the current is switched off, the magnetic field collapses which induces a secondary high voltage surge and the spark plug is fired. This high voltage surge creates a flyback voltage which the PCM uses as a feedback during the ignition diagnostics. The PCM continuously monitors the ignition system for concerns. The P2318 code sets when the PCM detects a short to voltage in the circuit.
OBDII Code P2318 Ford - Ignition Coil 'G' Primary Control Circuit Low - AutoCodes.com
P2318 Ford Code - Ignition Coil 'G' Primary Control Circuit Low

What are the Possible Causes of the DTC P2318 Ford?

  • Faulty Ignition Coil 'G'
  • Ignition Coil 'G' harness is open or shorted
  • Ignition Coil 'G' circuit poor electrical connection

How to Fix the DTC P2318 Ford?

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 P2318 Ford 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 P2318 Ford code?

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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 P2318 Ford Code

1. What are common symptoms of OBDII code P2318 in a Ford, indicating Ignition Coil 'G' Primary Control Circuit Low?

- Common symptoms include engine misfires, rough idling, a noticeable decrease in engine performance, and possible stalling.

2. What are possible causes of the OBDII code P2318 in a Ford related to the Ignition Coil 'G' Primary Control Circuit Low?

- Possible causes include a faulty ignition coil, damaged wiring or connectors in the ignition coil circuit, or a problem with the Engine Control Module (ECM).

3. How can I diagnose the issue causing the OBDII code P2318 in my Ford for the Ignition Coil 'G' Primary Control Circuit Low?

- You can start by visually inspecting the ignition coil and its connections for any visible damage. Using a multimeter, you can also test the resistance of the coil and check for proper voltage at the coil connector.

4. Can I continue driving my Ford with the OBDII code P2318 related to Ignition Coil 'G' Primary Control Circuit Low?

- It is not recommended to continue driving your vehicle with this issue, as it can lead to further damage to the engine and potentially cause safety concerns.

5. How can I repair the OBDII code P2318 in my Ford due to Ignition Coil 'G' Primary Control Circuit Low?

- Repair typically involves replacing the faulty ignition coil, repairing any damaged wiring or connectors, and clearing the code with an OBDII scanner.

6. Is it possible to reset the OBDII code P2318 related to Ignition Coil 'G' Primary Control Circuit Low without fixing the underlying issue?

- While you can clear the code temporarily with an OBDII scanner, the issue causing the code will persist until properly addressed, and the code is likely to return.

7. Can a DIY enthusiast fix the OBDII code P2318 in a Ford caused by Ignition Coil 'G' Primary Control Circuit Low?

- Depending on your experience and tools, replacing the ignition coil or repairing wiring issues can be a DIY-friendly task. However, if you are unsure, it's best to seek professional help.

8. What is the typical cost to repair the OBDII code P2318 related to Ignition Coil 'G' Primary Control Circuit Low in a Ford?

- The cost can vary depending on the exact cause of the issue, but generally, replacing an ignition coil can range from $100 to $300, including parts and labor.

9. How urgent is it to address the OBDII code P2318 due to Ignition Coil 'G' Primary Control Circuit Low in my Ford?

- It is recommended to address the issue promptly to prevent further damage to the engine and ensure the vehicle operates safely and efficiently.

10. Are there any preventive measures to avoid encountering the OBDII code P2318 related to Ignition Coil 'G' Primary Control Circuit Low in my Ford?

- Regular maintenance, such as inspecting and replacing ignition components according to the manufacturer's recommendations, can help prevent issues leading to this OBDII code.

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