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Engine-Codes – Mercury – P2318 Mercury

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

Quick Answer

The P2318 diagnostic trouble code (DTC) for Mercury vehicles refers to an issue with the Ignition Coil 'G' Primary Control Circuit registering a low voltage. Common causes include Faulty ignition coil 'G', Damaged wiring or connectors in the ignition coil circuit, Malfunctioning 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
P2318 Mercury indicates Ignition Coil 'G' Primary Control Circuit Low.
Common causes
Common causes include Faulty ignition coil 'G', Damaged wiring or connectors in the ignition coil circuit, Malfunctioning 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 09, 2024
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Code P2318 Mercury Description

The P2318 diagnostic trouble code (DTC) for Mercury vehicles refers to an issue with the Ignition Coil 'G' Primary Control Circuit registering a low voltage. This code indicates that there is a problem with the electrical circuit that controls the primary side of the ignition coil for cylinder G. The ignition coil is responsible for converting the low voltage from the battery into the high voltage needed to create a spark in the spark plugs, which ignites the air-fuel mixture in the engine cylinders.

OBDII Code P2318 Mercury - Ignition Coil 'G' Primary Control Circuit Low
P2318 Mercury Code - Ignition Coil 'G' Primary Control Circuit Low

Common Causes of P2318 Mercury

  1. Faulty ignition coil 'G'
  2. Damaged wiring or connectors in the ignition coil circuit
  3. Malfunctioning engine control module (ECM)
  4. Issues with the power supply to the ignition coil

Symptoms of P2318 Mercury

  1. Engine misfires or rough idle
  2. Decreased engine performance
  3. Stalling or difficulty starting the vehicle
  4. Check Engine Light illuminated on the dashboard

How to Fix P2318 Mercury

  1. Begin by visually inspecting the wiring and connectors in the ignition coil circuit for any signs of damage or corrosion. Repair or replace any damaged components.
  2. Test the ignition coil 'G' using a multimeter to check for proper resistance and continuity. Replace the ignition coil if it fails the test.
  3. Check the power supply to the ignition coil for any issues such as blown fuses or loose connections. Address any power supply problems.
  4. Clear the diagnostic trouble codes using an OBD-II scanner and perform a test drive to ensure the issue has been resolved.
  5. If the problem persists, further diagnostic testing may be required to pinpoint the exact cause of the low voltage in the Ignition Coil 'G' Primary Control Circuit.

Cost to Fix P2318 Mercury

The typical repair costs for addressing the P2318 code on a Mercury vehicle can range from $150 to $400, including parts and labor. However, it's important to note that specific diagnosis time and labor rates can vary depending on the location, vehicle make and model, and engine type. Auto repair shops usually 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 get a more accurate estimate, it is recommended to inquire about local rates before proceeding with the repair.

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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 Mercury Code

1. What are the common symptoms of OBDII code P2318 in a Mercury related to the Ignition Coil 'G' Primary Control Circuit Low?

Symptoms may include engine misfires, rough idling, lack of power, and illuminated check engine light.

2. What are the possible causes of OBDII code P2318 in a Mercury that indicates an issue with the Ignition Coil 'G' Primary Control Circuit Low?

Potential 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 OBDII code P2318 in my Mercury related to the Ignition Coil 'G' Primary Control Circuit Low?

You can use a scan tool to check for the code, visually inspect the wiring and connectors for damage, test the ignition coil for proper functioning, and perform a circuit test to identify any issues.

4. Can I continue driving my Mercury with OBDII code P2318 indicating a problem with the Ignition Coil 'G' Primary Control Circuit Low?

It is not recommended to drive the vehicle with this code present, as it can lead to more serious engine issues and potential damage if left unresolved.

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

Repair options may include replacing the faulty ignition coil, repairing or replacing damaged wiring or connectors, and resetting the ECM after the issue has been resolved.

6. Is it possible to clear OBDII code P2318 in my Mercury without fixing the underlying issue with the Ignition Coil 'G' Primary Control Circuit Low?

Clearing the code without addressing the root cause is not recommended, as the problem will likely persist and could lead to further complications down the line.

7. Can a DIY enthusiast fix OBDII code P2318 indicating a problem with the Ignition Coil 'G' Primary Control Circuit Low in a Mercury?

Depending on the DIYer's skill level and access to tools, it may be possible to address this issue by following repair guides and utilizing proper diagnostic equipment.

8. How much does it typically cost to repair OBDII code P2318 in a Mercury related to the Ignition Coil 'G' Primary Control Circuit Low?

Repair costs can vary depending on the extent of the issue, parts needed for replacement, and labor rates at the repair shop, but it's advisable to get estimates from local mechanics.

9. Are there any preventative maintenance tips to help avoid encountering OBDII code P2318 in a Mercury due to Ignition Coil 'G' Primary Control Circuit Low issues?

Regularly inspecting and maintaining the ignition system, replacing spark plugs and ignition coils at recommended intervals, and addressing any engine performance issues promptly can help prevent this code from appearing.

10. How long does it typically take to resolve OBDII code P2318 in a Mercury indicating a problem with the Ignition Coil 'G' Primary Control Circuit Low?

The time needed for repair can vary based on the specific issue, availability of parts, and the expertise of the mechanic, but it's advisable to address the problem as soon as possible to avoid further complications.

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