AutoCodes – Cadillac – P2318 Cadillac

P2318 Cadillac Code - Ignition Coil 7 Control Circuit Low Voltage

Quick Answer

The ignition system on this engine uses ignition coils with integrated power transistors. Common causes include Faulty Ignition Coil 7, Ignition Coil 7 harness is open or shorted, Ignition Coil 7 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: P2318 Cadillac indicates Ignition Coil 7 Control Circuit Low Voltage.
Common causes: Common causes include Faulty Ignition Coil 7, Ignition Coil 7 harness is open or shorted, Ignition Coil 7 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 518

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 Jul 31, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2318 Cadillac Description

The ignition system on this engine uses ignition coils with integrated power transistors. The Engine Control Module (ECM) controls the spark event for each cylinder through individual ignition coil control circuits. When the ECM commands the ignition control circuit On, electrical current flows through the primary winding of the ignition coil, creating a magnetic field. When a spark event is requested, the ECM commands the ignition control circuit Off, interrupting current flow through the primary winding. The collapsing magnetic field created by the primary winding induces a high voltage in the secondary winding, which is connected to the spark plugs. The Diagnostic Trouble Code (DTC) will be set when the control circuit commanded by the ECM state does not match the actual state.

OBDII Code P2318 Cadillac - Ignition Coil 7 Control Circuit Low Voltage - AutoCodes.com — P2318 Cadillac Code - Ignition Coil 7 Control Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P2318 Cadillac?

Faulty Ignition Coil 7
Ignition Coil 7 harness is open or shorted
Ignition Coil 7 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P2318 Cadillac?

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 P2318 Cadillac 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 P2318 Cadillac code?

Need more information on how to fix the P2318 Cadillac code? Get Access to Factory Service Manuals

Need Help with the Code?

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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 P2318 Cadillac Code

1. What are common symptoms of OBDII code P2318 related to Ignition Coil 7 Control Circuit Low Voltage in a Cadillac?

- Common symptoms include engine misfires, rough idling, loss of power, and the illumination of the Check Engine Light.

2. What are potential causes of OBDII code P2318 in a Cadillac?

- Possible causes include a faulty ignition coil, damaged wiring or connectors in the ignition coil circuit, a defective Engine Control Module (ECM), or a weak battery.

3. How can I diagnose the Ignition Coil 7 Control Circuit Low Voltage issue in my Cadillac?

- Diagnose by checking the wiring and connectors for any visible damage, testing the ignition coil for proper resistance, and using a multimeter to check voltage levels in the circuit.

4. Can I continue driving my Cadillac with OBDII code P2318?

- It is not recommended to continue driving with this issue, as it can lead to further damage to the engine and other components. It is best to address the problem promptly.

5. How can I repair OBDII code P2318 in my Cadillac?

- Repair options include replacing the faulty ignition coil, repairing damaged wiring or connectors, resetting the ECM, or addressing any underlying issues causing low voltage.

6. Are there any preventive maintenance tips to avoid OBDII code P2318 in the future?

- Regularly inspecting and maintaining the ignition system, ensuring proper battery voltage, and promptly addressing any engine performance issues can help prevent this code from reoccurring.

7. Is it safe to clear the OBDII code P2318 without fixing the underlying issue?

- Clearing the code without resolving the root cause can temporarily turn off the Check Engine Light, but the issue will likely resurface, potentially causing more serious problems.

8. How much does it typically cost to repair OBDII code P2318 in a Cadillac?

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

9. Can a DIY enthusiast fix OBDII code P2318 in a Cadillac?

- Depending on the skill level and tools available, some DIY enthusiasts may be able to address this issue themselves by following repair guides and using diagnostic tools.

10. Will OBDII code P2318 affect the fuel efficiency of my Cadillac?

- Yes, this code can lead to decreased fuel efficiency due to engine misfires and inefficient combustion. Addressing the issue promptly can help improve fuel economy.