AutoCodes – Mercury – P2308 Mercury

P2308 Mercury Code - Ignition Coil 'C' Secondary Circuit

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 'C', Ignition Coil 'C' harness is open or shorted, Ignition Coil 'C' 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: P2308 Mercury indicates Ignition Coil 'C' Secondary Circuit.
Common causes: Common causes include Faulty Ignition Coil 'C', Ignition Coil 'C' harness is open or shorted, Ignition Coil 'C' 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 1,184

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 P2308 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 P2308 code sets when the PCM detects a short to voltage in the circuit.

OBDII Code P2308 Mercury - Ignition Coil 'C' Secondary Circuit - AutoCodes.com — P2308 Mercury Code - Ignition Coil 'C' Secondary Circuit

What does this mean?

What are the Possible Causes of the DTC P2308 Mercury?

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

How to Fix the DTC P2308 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 P2308 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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Need more information on how to fix the P2308 Mercury code? Get Access to Factory Service Manuals

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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 P2308 Mercury Code

1. What are common symptoms of OBDII code P2308 in a Mercury related to the Ignition Coil 'C' Secondary Circuit?

- Common symptoms include engine misfires, rough idling, reduced engine performance, and illuminated check engine light.

2. What are possible causes of OBDII code P2308 in a Mercury indicating an issue with the Ignition Coil 'C' Secondary Circuit?

- 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 cause of OBDII code P2308 in my Mercury related to the Ignition Coil 'C' Secondary Circuit?

- Diagnosis typically involves inspecting the ignition coil, checking for damaged wiring or connectors, and using a scan tool to analyze live data and pinpoint the issue.

4. Can driving with OBDII code P2308 in a Mercury Ignition Coil 'C' Secondary Circuit problem cause further damage?

- Continuing to drive with this issue can potentially lead to permanent damage to the ignition system, catalytic converter, or other engine components.

5. How can I repair OBDII code P2308 in my Mercury due to the Ignition Coil 'C' Secondary Circuit problem?

- Repair typically involves replacing the faulty ignition coil, repairing or replacing damaged wiring or connectors, and clearing the trouble codes with a scan tool.

6. What are some tips to prevent OBDII code P2308 from recurring in my Mercury after repair?

- To prevent code P2308 from recurring, ensure all electrical connections are secure, use high-quality ignition coils, and perform regular maintenance on the ignition system.

7. Is it safe to drive my Mercury with OBDII code P2308 related to the Ignition Coil 'C' Secondary Circuit issue?

- It is not recommended to drive the vehicle with this issue as it can lead to poor engine performance, potential damage, and safety hazards on the road.

8. How much does it typically cost to repair OBDII code P2308 in a Mercury due to the Ignition Coil 'C' Secondary Circuit issue?

- The cost of repair can vary depending on the cause of the issue, but it may range from $100 to $300 for parts and labor.

9. Can a DIY enthusiast fix OBDII code P2308 in a Mercury caused by the Ignition Coil 'C' Secondary Circuit problem?

- Depending on the individual's skill level and access to tools, a DIY enthusiast may be able to diagnose and replace the faulty ignition coil themselves.

10. Will disconnecting the battery reset OBDII code P2308 in my Mercury related to the Ignition Coil 'C' Secondary Circuit?

- Disconnecting the battery may temporarily clear the trouble codes, but the underlying issue causing code P2308 will need to be addressed to prevent it from returning.