AutoCodes – Mercury – P2315 Mercury

P2315 Mercury Code - Ignition Coil 'F' 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 'F', Ignition Coil 'F' harness is open or shorted, Ignition Coil 'F' 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: P2315 Mercury indicates Ignition Coil 'F' Primary Control Circuit Low.
Common causes: Common causes include Faulty Ignition Coil 'F', Ignition Coil 'F' harness is open or shorted, Ignition Coil 'F' 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 1,391

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2315 Mercury 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 P2315 code sets when the PCM detects a short to voltage in the circuit.

OBDII Code P2315 Mercury - Ignition Coil 'F' Primary Control Circuit Low - AutoCodes.com — P2315 Mercury Code - Ignition Coil 'F' Primary Control Circuit Low

What does this mean?

What are the Possible Causes of the DTC P2315 Mercury?

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

How to Fix the DTC P2315 Mercury?

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 P2315 Mercury 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.

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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 P2315 Mercury Code

What does the OBDII code P2315 mean on a Mercury vehicle?

1. The P2315 code indicates a problem with the Ignition Coil 'F' Primary Control Circuit, specifically that the voltage or signal is lower than expected. 2.

What are the common symptoms of the P2315 code on a Mercury?

Symptoms may include engine misfires, rough idling, reduced power, poor fuel economy, and the Check Engine Light illuminating. 3.

What causes the P2315 code on a Mercury?

Common causes include a faulty ignition coil, damaged wiring or connectors, a malfunctioning powertrain control module (PCM), or a failing ignition control module. 4.

Can I drive my Mercury with the P2315 code active?

Driving with the P2315 code is not recommended as it can lead to engine misfires, reduced performance, and potential damage to the catalytic converter. 5.

How do I diagnose the P2315 code on my Mercury?

Diagnosis typically involves inspecting the ignition coil and its wiring, testing the coil with a multimeter, and checking for continuity and proper voltage in the circuit. 6.

How do I fix the P2315 code on a Mercury vehicle?

Repairs may include replacing the faulty ignition coil, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the PCM if necessary. 7.

How much does it cost to fix the P2315 code on a Mercury?

Repair costs can vary but typically range from $100 to $300, depending on whether the ignition coil or other components need replacement. 8.

Can a bad spark plug cause the P2315 code on a Mercury?

A bad spark plug is unlikely to directly cause the P2315 code, but worn or damaged plugs can lead to ignition system issues that may contribute to coil problems. 9.

How can I prevent the P2315 code from occurring on my Mercury?

Regular maintenance, including inspecting ignition coils, wiring, and spark plugs, can help prevent the conditions that trigger this code. 10.

Will clearing the P2315 code fix the problem on my Mercury?

Clearing the code will turn off the Check Engine Light temporarily, but it won't fix the underlying issue. Proper diagnosis and repair are needed to resolve the problem.