AutoCodes – GMC – P2303 2015 GMC Sierra

P2303 2015 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 2015 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 151

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 2015 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 2015 GMC Sierra - Ignition Coil 2 Control Circuit Low Voltage - AutoCodes.com — P2303 2015 GMC Sierra Code - Ignition Coil 2 Control Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P2303 2015 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 2015 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 2015 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 2015 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 2015 GMC Sierra Code

1. What are the common symptoms of OBDII code P2303 in a 2015 GMC Sierra related to Ignition Coil 2 Control Circuit Low Voltage?

- Common symptoms include engine misfires, rough idling, decreased engine performance, and illuminated check engine light.

2. What are the possible causes of OBDII code P2303 in a 2015 GMC Sierra indicating Ignition Coil 2 Control Circuit Low Voltage?

- Potential causes include a faulty ignition coil, damaged wiring or connectors in the ignition coil circuit, a malfunctioning PCM, or a problem with the ignition coil control circuit.

3. How can I diagnose the issue causing OBDII code P2303 in my 2015 GMC Sierra?

- Diagnosis typically involves inspecting the ignition coil and its wiring, testing the ignition coil for proper functioning, checking the PCM for any faults, and verifying the continuity of the control circuit.

4. Can I still drive my 2015 GMC Sierra with OBDII code P2303 for Ignition Coil 2 Control Circuit Low Voltage?

- It is not recommended to drive the vehicle with this code present, as it can lead to further damage to the engine and other components. It is best to address the issue promptly.

5. How can I repair OBDII code P2303 in my 2015 GMC Sierra related to Ignition Coil 2 Control Circuit Low Voltage?

- Repair may involve replacing the faulty ignition coil, repairing or replacing damaged wiring or connectors, resetting the PCM, or addressing any issues in the control circuit.

6. Is it possible to clear OBDII code P2303 in a 2015 GMC Sierra without fixing the underlying issue?

- While you can clear the code using an OBDII scanner, it is essential to address the root cause of the problem to prevent the code from reoccurring and potentially causing further issues.

7. Are there any preventative measures to avoid OBDII code P2303 in a 2015 GMC Sierra related to Ignition Coil 2 Control Circuit Low Voltage?

- Regular maintenance, such as inspecting the ignition system components, checking for worn or damaged wiring, and addressing any issues promptly, can help prevent this code from appearing.

8. How much does it typically cost to repair OBDII code P2303 in a 2015 GMC Sierra?

- The cost of repair can vary depending on the exact cause of the issue, the parts needed for replacement, and labor costs. It's best to consult a mechanic for a precise estimate.

9. Can a DIY enthusiast fix OBDII code P2303 in a 2015 GMC Sierra related to Ignition Coil 2 Control Circuit Low Voltage?

- Depending on the individual's skill level and experience with automotive repairs, some DIY enthusiasts may be able to address this issue themselves by following repair guides and using the right tools.

10. Will ignoring OBDII code P2303 in a 2015 GMC Sierra cause further damage to the vehicle?

- Ignoring this code can potentially lead to more severe engine problems, reduced fuel efficiency, and even complete engine failure in extreme cases. It is advisable to address the issue promptly to prevent further damage.