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Engine-Codes – GMC – P2303 2018 GMC Sierra

P2303 2018 GMC Sierra Code - Ignition Coil 2 Control Circuit Low Voltage

Quick Answer

The P2303 diagnostic trouble code (DTC) for a 2018 GMC Sierra specifically refers to the Ignition Coil 2 Control Circuit Low Voltage. Common causes include Faulty ignition coil, Damaged wiring or connectors in the ignition coil circuit, Issues with the 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 2018 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, Issues with the 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 14, 2024
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Code P2303 2018 GMC Sierra Description

The P2303 diagnostic trouble code (DTC) for a 2018 GMC Sierra specifically refers to the Ignition Coil 2 Control Circuit Low Voltage. This code indicates that there is a problem with the electrical circuit that controls the ignition coil for cylinder 2 in the engine. The ignition coil is a crucial component of the ignition system, responsible for converting the low voltage from the battery into the high voltage needed to create a spark in the spark plugs. This spark is essential for igniting the air-fuel mixture in the combustion chamber, ultimately powering the engine.

OBDII Code P2303 2018 GMC Sierra - Ignition Coil 2 Control Circuit Low Voltage
P2303 2018 GMC Sierra Code - Ignition Coil 2 Control Circuit Low Voltage

Common Causes of P2303 2018 GMC Sierra

  1. Faulty ignition coil
  2. Damaged wiring or connectors in the ignition coil circuit
  3. Issues with the engine control module (ECM)
  4. Problems with the power supply to the ignition coil
  5. Corrosion or moisture in the ignition coil circuit

Symptoms of P2303 2018 GMC Sierra

  1. Engine misfires or rough idling
  2. Decreased engine performance
  3. Poor fuel efficiency
  4. Engine stalling
  5. Illumination of the check engine light

How to Fix P2303 2018 GMC Sierra

  1. Begin by diagnosing the specific cause of the low voltage in the Ignition Coil 2 Control Circuit using a diagnostic scanner.
  2. Inspect the ignition coil, wiring, and connectors for any visible damage or corrosion. Replace any faulty components.
  3. Test the power supply to the ignition coil to ensure it is functioning correctly.
  4. Clear the DTC and reset the ECM to see if the issue persists.
  5. If the problem persists, consider seeking professional help to further diagnose and repair the issue.

Cost to Fix P2303 2018 GMC Sierra

The cost of repairing the Ignition Coil 2 Control Circuit Low Voltage issue in a 2018 GMC Sierra can vary depending on the specific cause of the problem and the cost of parts and labor in your area. On average, you can expect to pay anywhere from $150 to $400 for parts and labor. Keep in mind that labor rates at auto repair shops can vary, with hourly rates typically ranging from $80 to $150. It's recommended to obtain quotes from multiple shops to ensure you get the best price for the repair.

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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 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code P2303 in a 2018 GMC Sierra?

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

2. What causes the OBDII code P2303 in a 2018 GMC Sierra?

- The code P2303 typically indicates a problem with the ignition coil 2 control circuit experiencing low voltage, which can be caused by a faulty ignition coil, wiring issues, or a failing engine control module.

3. How can I diagnose the issue causing OBDII code P2303 in my 2018 GMC Sierra?

- Diagnostic steps may include checking the ignition coil 2 for proper operation, inspecting the wiring for any damage or loose connections, and using a multimeter to test voltage levels in the circuit.

4. Can a DIY enthusiast repair OBDII code P2303 in a 2018 GMC Sierra?

- Depending on your skill level, you may be able to replace the faulty ignition coil 2 or repair any damaged wiring yourself. However, if you are unsure, it is recommended to seek professional assistance.

5. Is it safe to continue driving my 2018 GMC Sierra with OBDII code P2303 present?

- It is not advisable to drive the vehicle with code P2303 active, as it can lead to further engine issues and potential damage if left unresolved. It is recommended to address the problem promptly.

6. How much does it typically cost to repair OBDII code P2303 in a 2018 GMC Sierra?

- The cost of repairing OBDII code P2303 can vary depending on the specific issue causing the code, but it may range from $100 to $300 for parts and labor.

7. Are there any preventive measures to avoid OBDII code P2303 in a 2018 GMC Sierra?

- Regular maintenance, such as inspecting and replacing ignition components at recommended intervals, can help prevent issues like code P2303 from occurring.

8. Can a bad spark plug cause OBDII code P2303 in a 2018 GMC Sierra?

- While a bad spark plug may contribute to engine performance issues, OBDII code P2303 specifically relates to the ignition coil 2 control circuit experiencing low voltage.

9. Will resetting the Check Engine Light resolve OBDII code P2303 in a 2018 GMC Sierra?

- Simply resetting the Check Engine Light will not fix the underlying issue causing code P2303. It is important to diagnose and address the root cause of the problem.

10. How long does it typically take to repair OBDII code P2303 in a 2018 GMC Sierra?

- The repair time for OBDII code P2303 can vary based on the extent of the issue and the availability of parts, but it may take anywhere from 1 to 3 hours at a repair shop.

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