AutoCodes – GMC – P2303 2014 GMC Sierra

P2303 2014 GMC Sierra Code - Ignition Coil 2 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 2, Ignition Coil 2 harness is open or shorted, Ignition Coil 2 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: P2303 2014 GMC Sierra indicates Ignition Coil 2 Control Circuit Low Voltage.
Common causes: Common causes include Faulty Ignition Coil 2, Ignition Coil 2 harness is open or shorted, Ignition Coil 2 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 205

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 Mar 25, 2024

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2303 2014 GMC Sierra 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 P2303 2014 GMC Sierra - Ignition Coil 2 Control Circuit Low Voltage - AutoCodes.com — P2303 2014 GMC Sierra Code - Ignition Coil 2 Control Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P2303 2014 GMC Sierra?

Faulty Ignition Coil 2
Ignition Coil 2 harness is open or shorted
Ignition Coil 2 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P2303 2014 GMC Sierra?

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 P2303 2014 GMC Sierra 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 P2303 2014 GMC Sierra 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 P2303 2014 GMC Sierra Code

1. What does the OBDII code P2303 mean on a 2014 GMC Sierra?

The P2303 code indicates that there is an issue with the ignition control circuit of Coil 2, specifically that the voltage in the control circuit is lower than expected.

2. What are the common symptoms of code P2303 in a 2014 GMC Sierra?

Symptoms may include engine misfiring, rough idle, decreased fuel efficiency, the engine light turning on, and potentially the engine not starting.

3. What can cause a P2303 code to appear in a 2014 GMC Sierra?

Possible causes include faulty ignition coil, damaged wiring or connectors in the ignition coil circuit, or a problem with the engine control module.

4. How do I diagnose the problem leading to a P2303 code in my 2014 GMC Sierra?

Diagnosis should begin with a visual inspection of the ignition coil and associated wiring for any obvious damage or disconnections. Use a multimeter to check for proper voltage levels at the coil, and consider scanning the engine control module to look for additional diagnostic trouble codes.

5. What steps should I take to fix the issue causing the P2303 code in a 2014 GMC Sierra?

After diagnosing, repair or replace any faulty components such as the ignition coil or damaged wires. Ensure all connections are secure, and clear the code from the ECM to see if it returns.

6. Is it safe to drive my 2014 GMC Sierra with the P2303 code?

While you may be able to drive the vehicle, doing so with a misfiring engine can cause further damage. It's recommended to address the issue promptly to avoid potential long-term damage.

7. Can a faulty battery or alternator trigger a P2303 code in a 2014 GMC Sierra?

While less common, electrical issues like a failing battery or alternator that causes low system voltage can indirectly contribute to ignition-related codes. Itâ€™s a good idea to check the charging system if experiencing ignition issues.

8. How urgent is it to repair a P2303 code in a 2014 GMC Sierra?

It is fairly urgent to address this issue to prevent possible further damage to the vehicle's ignition system and to avoid operational issues like stalling and reduced engine performance.