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AutoCodes – GMC – P2303 2017 GMC Sierra

P2303 2017 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 2017 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 228
How popular is this code, among other codes? Low
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Table of contents Created and updated by William Orellana on Mar 25, 2024
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Code P2303 2017 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 2017 GMC Sierra - Ignition Coil 2 Control Circuit Low Voltage - AutoCodes.com
P2303 2017 GMC Sierra Code - Ignition Coil 2 Control Circuit Low Voltage
What does this mean?

What are the Possible Causes of the DTC P2303 2017 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 2017 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 2017 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 2017 GMC Sierra code?

Need more information on how to fix the P2303 2017 GMC Sierra code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P2303 2017 GMC Sierra code diagnosed by a professional: Find a repair shop in your area

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 2017 GMC Sierra Code

1. What does the OBDII code P2303 mean on a 2017 GMC Sierra?

P2303 indicates that the ignition coil 2 control circuit is experiencing low voltage, which can affect the engine's performance.

2. What are the common symptoms of code P2303 on a 2017 GMC Sierra?

Symptoms include engine misfires, rough idling, reduced power, poor fuel economy, and the check engine light being illuminated.

3. What causes the P2303 code to appear on my GMC Sierra?

Common causes include a faulty ignition coil, damaged wiring or connectors in the coil 2 circuit, a failing powertrain control module (PCM), or corroded terminals.

4. Can I drive my 2017 GMC Sierra with the P2303 code?

Driving with this code is not recommended as it can lead to engine misfires and potentially damage the catalytic converter over time.

5. How do I diagnose the P2303 code on my GMC Sierra?

Start by inspecting the ignition coil 2 and its wiring for damage or corrosion. Use a multimeter to check voltage and continuity in the circuit. If necessary, test the ignition coil and PCM.

6. What is the most common fix for the P2303 code on a GMC Sierra?

The most common fix is replacing the faulty ignition coil and repairing or replacing any damaged wiring or connectors.

7. How much does it cost to fix the P2303 code on a 2017 GMC Sierra?

The cost can vary, but replacing an ignition coil typically costs $50–$150 for the part, with additional labor costs if done by a mechanic.

8. Can a bad battery cause the P2303 code on a GMC Sierra?

Yes, a weak or failing battery can result in low voltage, potentially triggering this code.

9. How can I prevent the P2303 code from recurring?

Regularly inspect and maintain the ignition system, including coils, wiring, and connectors, and ensure your battery is in good condition.

10. Do I need to clear the code after repairs on my GMC Sierra?

Yes, use an OBDII scanner to clear the code and verify the issue is resolved. If the code returns, further diagnosis may be needed.

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