AutoCodes – GMC – P2301 GMC

P2301 GMC Code - Ignition Coil 1 Control Circuit High Voltage

Quick Answer

The ignition system on this engine uses ignition coils with integrated power transistors. Common causes include Faulty Ignition Coil 1, Ignition Coil 1 harness is open or shorted, Ignition Coil 1 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: P2301 GMC indicates Ignition Coil 1 Control Circuit High Voltage.
Common causes: Common causes include Faulty Ignition Coil 1, Ignition Coil 1 harness is open or shorted, Ignition Coil 1 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 312

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 Jul 31, 2021

Description
Possible Causes
How To Fix
Cost to Diagnose
FAQs
Comments
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Code P2301 GMC 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 P2301 GMC - Ignition Coil 1 Control Circuit High Voltage - AutoCodes.com — P2301 GMC Code - Ignition Coil 1 Control Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P2301 GMC?

Faulty Ignition Coil 1
Ignition Coil 1 harness is open or shorted
Ignition Coil 1 circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P2301 GMC?

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 P2301 GMC 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 P2301 GMC code?

Need more information on how to fix the P2301 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

Get the P2301 GMC code diagnosed by a professional: Find a repair shop in your area

Information for Specific GMC Models

P2301 2014 GMC Sierra — Ignition Coil 1 Control Circuit High Voltage
P2301 2015 GMC Sierra — Ignition Coil 1 Control Circuit High Voltage
P2301 2016 GMC Sierra — Ignition Coil 1 Control Circuit High Voltage
P2301 2017 GMC Sierra — Ignition Coil 1 Control Circuit High Voltage
P2301 2018 GMC Sierra — Ignition Coil 1 Control Circuit High Voltage

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 P2301 GMC Code

What does the OBDII code P2301 mean on a GMC?

P2301 indicates a high voltage issue in the ignition coil 1 control circuit, which can affect the firing of the engine's first ignition coil.

What are the symptoms of the P2301 code on a GMC?

Common symptoms include engine misfires, rough idling, reduced engine performance, poor fuel economy, and the check engine light illuminating.

What causes the P2301 code to appear on a GMC?

The code can be caused by a faulty ignition coil, damaged wiring or connectors, a defective powertrain control module (PCM), or corrosion in the ignition circuit.

How can I diagnose the P2301 code on my GMC vehicle?

Start by inspecting the ignition coil 1 and its wiring for damage or corrosion. Use a multimeter to check for proper voltage and resistance in the circuit. If necessary, test the PCM.

Can I drive my GMC with the P2301 code?

Driving with this code is not recommended as it can lead to misfires, reduced engine performance, and potential damage to other components like the catalytic converter.

How do I fix the P2301 code on a GMC?

Repairs may include replacing the faulty ignition coil, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the PCM if itâ€™s determined to be the issue.

How much does it cost to fix the P2301 code on a GMC?

Repair costs can vary but typically range from $100 to $300 for an ignition coil replacement. Additional wiring or PCM repairs may increase the cost.

Can a bad spark plug cause the P2301 code on a GMC?

While a bad spark plug itself wonâ€™t directly cause the P2301 code, it can contribute to ignition system issues, so inspecting and replacing spark plugs is a good practice during diagnosis.

Is the P2301 code specific to GMC vehicles?

No, the P2301 code is a generic OBDII code applicable to many vehicle makes and models, but its specific symptoms and fixes may vary slightly for GMC vehicles.

How can I prevent the P2301 code from occurring in my GMC?

Regular maintenance, including inspecting ignition components, replacing spark plugs on schedule, and keeping wiring clean and secure, can help prevent this code.