AutoCodes – Audi – P2308 Audi

P2308 Audi Code - Ignition Coil 3 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 3, Ignition Coil 3 harness is open or shorted, Ignition Coil 3 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 Audi indicates Ignition Coil 3 Secondary Circuit.
Common causes: Common causes include Faulty Ignition Coil 3, Ignition Coil 3 harness is open or shorted, Ignition Coil 3 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 1,615

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 Audi 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 Audi - Ignition Coil 3 Secondary Circuit - AutoCodes.com — P2308 Audi Code - Ignition Coil 3 Secondary Circuit

What does this mean?

What are the Possible Causes of the DTC P2308 Audi?

Faulty Ignition Coil 3
Ignition Coil 3 harness is open or shorted
Ignition Coil 3 circuit poor electrical connection

How to Fix the DTC P2308 Audi?

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 Audi 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 P2308 Audi Code

1. What does the OBDII code P2308 mean on an Audi?

P2308 indicates an issue with the Ignition Coil 3 Secondary Circuit, typically involving a malfunction or improper voltage in the circuit related to the third ignition coil.

2. What are the common symptoms of P2308 in an Audi?

Symptoms may include engine misfires, rough idling, reduced engine performance, poor fuel economy, and the Check Engine Light being illuminated.

3. What causes the P2308 code to appear in an Audi?

Common causes include a faulty ignition coil, damaged wiring or connectors in the ignition circuit, a failing spark plug, or a malfunctioning engine control module (ECM).

4. Can I drive my Audi with the P2308 code?

While it may be possible to drive short distances, driving with this code can lead to further engine damage, reduced performance, and potentially unsafe driving conditions.

5. How do I diagnose the P2308 code on my Audi?

Diagnosis typically involves using an OBDII scanner to confirm the code, inspecting the ignition coil and related wiring, testing the spark plug, and checking for ECM issues.

6. How can I fix the P2308 code on an Audi?

Repairs may include replacing the ignition coil, repairing or replacing damaged wiring or connectors, replacing the spark plug, or, in rare cases, reprogramming or replacing the ECM.

7. How much does it cost to fix the P2308 code on an Audi?

The repair cost varies but typically ranges from $100 to $300 for parts and labor, depending on whether the ignition coil, wiring, or spark plug needs replacement.

8. Can a bad spark plug cause the P2308 code in an Audi?

Yes, a worn or damaged spark plug can disrupt the ignition coil's function, triggering the P2308 code.

9. How do I prevent the P2308 code from recurring in my Audi?

Regular maintenance, including timely replacement of spark plugs and ignition coils, along with inspecting wiring for damage, can help prevent this issue.

10. Is the P2308 code specific to Audi vehicles?

No, the P2308 code is a generic OBDII code that can appear in any vehicle, but the exact diagnosis and repair steps may vary by make and model.