AutoCodes – Audi – P2312 Audi

P2312 Audi Code - Ignition Coil 5 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 5, Ignition Coil 5 harness is open or shorted, Ignition Coil 5 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: P2312 Audi indicates Ignition Coil 5 Primary Control Circuit Low.
Common causes: Common causes include Faulty Ignition Coil 5, Ignition Coil 5 harness is open or shorted, Ignition Coil 5 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 1,568

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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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 P2312 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 P2312 code sets when the PCM detects a short to voltage in the circuit.

OBDII Code P2312 Audi - Ignition Coil 5 Primary Control Circuit Low - AutoCodes.com — P2312 Audi Code - Ignition Coil 5 Primary Control Circuit Low

What does this mean?

What are the Possible Causes of the DTC P2312 Audi?

Faulty Ignition Coil 5
Ignition Coil 5 harness is open or shorted
Ignition Coil 5 circuit poor electrical connection

How to Fix the DTC P2312 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 P2312 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 P2312 Audi Code

1. What does the OBDII code P2312 mean on an Audi?

The P2312 code indicates an issue with the Ignition Coil 5 Primary Control Circuit, specifically that the voltage is lower than expected.

2. What are the common symptoms of the P2312 code?

Common symptoms include engine misfires, rough idling, reduced engine performance, difficulty starting, and possible illumination of the check engine light.

3. What are the potential causes of the P2312 code on an Audi?

The most common causes are a faulty ignition coil, damaged wiring or connectors in the ignition coil circuit, a failed powertrain control module (PCM), or a bad spark plug.

4. How do I diagnose the P2312 code?

Diagnosis involves inspecting the ignition coil and its wiring for damage, testing the ignition coil's resistance, and using a multimeter to check for proper voltage and continuity in the primary control circuit.

5. Can I drive my Audi with the P2312 code?

Itâ€™s not recommended, as driving with this code can cause further damage to the engine due to misfires and potentially lead to more costly repairs.

6. How do I fix the P2312 code on my Audi?

Repairs may include replacing the faulty ignition coil, repairing or replacing damaged wiring or connectors, replacing spark plugs, or, in rare cases, repairing or reprogramming the PCM.

7. How much does it cost to repair the P2312 code?

The cost varies, but replacing an ignition coil typically ranges from $150 to $300, depending on the part and labor costs.

8. Can a bad spark plug cause the P2312 code?

Yes, a bad spark plug can lead to increased resistance in the circuit, potentially triggering the P2312 code.

9. What tools are needed to troubleshoot the P2312 code?

Youâ€™ll need an OBDII scanner, a multimeter, and potentially a wiring diagram for your Audiâ€™s ignition system.

10. Will clearing the P2312 code with a scanner fix the problem?

No, clearing the code will only turn off the check engine light temporarily; the underlying issue must be resolved to prevent the code from returning.