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Engine-Codes – GMC – P2303 2014 GMC Sierra

P2303 2014 GMC Sierra Code - Ignition Coil 2 Control Circuit Low Voltage

Quick Answer

The P2303 diagnostic trouble code (DTC) for a 2014 GMC Sierra relates to the Ignition Coil 2 Control Circuit Low Voltage. Common causes include Faulty ignition coil, Damaged wiring or connectors in the ignition coil circuit, Malfunctioning engine control module (ECM). 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, Damaged wiring or connectors in the ignition coil circuit, Malfunctioning engine control module (ECM).
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.
What is this?
Table of contents Created and updated by William Orellana on Sep 29, 2024
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Code P2303 2014 GMC Sierra Description

The P2303 diagnostic trouble code (DTC) for a 2014 GMC Sierra relates to the Ignition Coil 2 Control Circuit Low Voltage. This code indicates that there is a problem with the control circuit for the ignition coil in cylinder 2, resulting in lower than expected voltage levels. The ignition coil is a crucial component in the ignition system of the vehicle, responsible for converting the low voltage from the battery into the high voltage needed to create a spark in the spark plugs. This spark ignites the air-fuel mixture in the combustion chamber, powering the engine.

OBDII Code P2303 2014 GMC Sierra - Ignition Coil 2 Control Circuit Low Voltage
P2303 2014 GMC Sierra Code - Ignition Coil 2 Control Circuit Low Voltage

Common Causes of P2303 2014 GMC Sierra

  1. Faulty ignition coil
  2. Damaged wiring or connectors in the ignition coil circuit
  3. Malfunctioning engine control module (ECM)
  4. Power supply issues to the ignition coil
  5. Corrosion or moisture in the ignition coil circuit

Symptoms of P2303 2014 GMC Sierra

  1. Engine misfires
  2. Rough idling or running
  3. Difficulty starting the engine
  4. Decreased power and acceleration
  5. Reduced fuel efficiency

How to Fix P2303 2014 GMC Sierra

  1. Begin by inspecting the wiring and connectors in the ignition coil circuit for any damage or corrosion. Repair or replace as necessary.
  2. Test the ignition coil in cylinder 2 using a multimeter to check for proper resistance and continuity. Replace the ignition coil if it is faulty.
  3. Check the power supply to the ignition coil to ensure it is delivering the correct voltage. Repair any issues with the power supply.
  4. Clear the DTC using a diagnostic scan tool and test drive the vehicle to ensure the issue has been resolved.
  5. If the problem persists, further diagnostics may be needed to identify any underlying issues with the ECM or other components in the ignition system.

Cost to Fix P2303 2014 GMC Sierra

The typical repair costs for addressing a P2303 code on a 2014 GMC Sierra can vary depending on the specific cause of the issue. In general, replacing a faulty ignition coil can cost between $100 and $300, including parts and labor. Additional costs may be incurred if there are wiring or connector issues that need to be repaired. It's important to note that diagnostic time and labor rates at auto repair shops can vary, with hourly rates typically ranging between $80 and $150. Rates may be higher at dealerships or in metropolitan areas, while independent shops may offer more competitive pricing. For a more accurate estimate, it's recommended to consult with local auto repair shops.

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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. It’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.

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