AutoCodes – Generic – P1315

P1315 Code - Igniter Circuit Malfunction No. 4

Quick Answer

Direct Ignition System (DIS) is a 1-cylinder ignition system that ignites one cylinder with one ignition coil. Common causes include Faulty Ignition Coil No, 4, Ignition Coil No. 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: P1315 indicates Igniter Circuit Malfunction No. 4.
Common causes: Common causes include Faulty Ignition Coil No, 4, Ignition Coil No.
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 35,081

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 Aug 09, 2019

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P1315 Description

Direct Ignition System (DIS) is a 1-cylinder ignition system that ignites one cylinder with one ignition coil. Ignitor is integral to ignition coil. The Engine Control Module (ECM) determines ignition timing and outputs a ignition signal (IGT) for each cylinder. Based on the IGT signals, power transistors in the ignitor cut of current to primary coil in ignition coil, causing ignition coil to fire spark plug. After delivering a command to turn off primary circuit on the IGT wire, ECM monitors IGF circuit to ensure primary switching occurred.

OBDII Code P1315 - Igniter Circuit Malfunction No. 4 - AutoCodes.com — P1315 Code - Igniter Circuit Malfunction No. 4

What does this mean?

What are the Possible Causes of the DTC P1315?

Faulty Ignition Coil No. 4
Ignition Coil No. 4 harness is open or shorted
Ignition Coil No. 4 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P1315?

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 P1315 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.

Need more information about the P1315 code?

Need more information on how to fix the P1315 code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P1315 code diagnosed by a professional: Find a repair shop in your area

Information for Specific Makes

P1315 Buick — Ignition Coil 4 Primary Feedback Circuit
P1315 Cadillac — Ignition Coil 4 Primary Feedback Circuit
P1315 Chevrolet — Ignition Coil 4 Primary Feedback Circuit
P1315 GMC — Ignition Coil 4 Primary Feedback Circuit
P1315 Hyundai — Ignition Coil 2 High Output
P1315 Jaguar — Persistent Misfire
P1315 Land Rover — Persistent Misfire
P1315 Lexus — Igniter Circuit Malfunction No. 4
P1315 Pontiac — Ignition Coil 4 Primary Feedback Circuit
P1315 Saturn — Ignition Coil 4 Primary Feedback Circuit
P1315 Toyota — Igniter Circuit Malfunction No. 4

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 P1315 Code

1. What are the common symptoms of OBDII code P1315 (Igniter Circuit Malfunction No. 4)?

The common symptoms of P1315 may include engine misfires, rough idling, lack of power, and in some cases, the Check Engine Light may illuminate.

2. What are the possible causes of OBDII code P1315?

The possible causes of P1315 include a faulty igniter circuit in cylinder No. 4, a defective ignition coil, damaged spark plugs, wiring issues, or a problem with the Engine Control Module (ECM).

3. How can I diagnose the cause of OBDII code P1315?

To diagnose P1315, you can start by checking the ignition coil and spark plugs in cylinder No. 4. Inspect the wiring for any damage or loose connections. Using a diagnostic scanner to read live data can also help pinpoint the issue.

4. Can a DIYer repair OBDII code P1315 at home?

Depending on your automotive repair skills, DIYers may be able to repair P1315 at home by replacing the faulty ignition coil, spark plugs, or repairing any damaged wiring. However, if the issue lies with the ECM, it may require professional diagnosis and repair.

5. Is it safe to continue driving with OBDII code P1315 present?

It is not recommended to continue driving with P1315 present, as it can lead to further engine damage or poor performance. It's best to address the issue promptly to prevent potential costly repairs down the line.

6. Can a bad spark plug cause OBDII code P1315 to appear?

Yes, a bad spark plug in cylinder No. 4 can cause P1315 to appear. Faulty spark plugs can lead to ignition issues, resulting in the malfunction of the igniter circuit and triggering the trouble code.

7. How much does it typically cost to repair OBDII code P1315?

The cost of repairing P1315 can vary depending on the specific cause of the issue and whether you choose to DIY or seek professional help. Costs may range from replacing a spark plug or ignition coil to more extensive repairs if the ECM needs attention.

8. Can weather conditions affect OBDII code P1315?

Extreme weather conditions, such as excessive heat or moisture, can potentially exacerbate issues related to P1315, especially if there are existing problems with the ignition system components or wiring.

9. Will resetting the Check Engine Light resolve OBDII code P1315?

Simply resetting the Check Engine Light without addressing the underlying issue causing P1315 will not resolve the problem. It's crucial to diagnose the root cause of the code and perform the necessary repairs to clear the code permanently.

10. How long does it take to repair OBDII code P1315?

The time it takes to repair P1315 can vary based on the specific cause and complexity of the issue. Simple fixes like replacing a spark plug may take minutes, while more involved repairs like diagnosing wiring issues or replacing an ECM can take several hours or longer.