P2304 2016 GMC Sierra Code - Ignition Coil 2 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 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
- P2304 2016 GMC Sierra indicates Ignition Coil 2 Control Circuit High 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.
Code P2304 2016 GMC Sierra Description
What are the Possible Causes of the DTC P2304 2016 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 P2304 2016 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 P2304 2016 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.
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Frequently Asked Questions about P2304 2016 GMC Sierra Code
1. What does the OBDII code P2304 mean on a 2016 GMC Sierra?
P2304 indicates a high voltage issue in the ignition coil 2 control circuit, meaning the engine control module (ECM) has detected an electrical fault affecting ignition coil 2.
2. What are the symptoms of code P2304 on a 2016 GMC Sierra?
Symptoms can include engine misfires, rough idling, reduced fuel efficiency, hesitation during acceleration, and possibly an illuminated Check Engine Light.
3. What causes the P2304 code on a 2016 GMC Sierra?
Common causes include a faulty ignition coil, damaged wiring or connectors in the ignition coil circuit, a malfunctioning ECM, or corrosion in the electrical connections.
4. Can I drive my 2016 GMC Sierra with a P2304 code?
While the vehicle may still run, driving with this code can cause engine misfires and damage to other components, such as the catalytic converter. It’s best to address the issue promptly.
5. How do I diagnose the P2304 code on my 2016 GMC Sierra?
Diagnosis involves inspecting the ignition coil 2 and its wiring for damage, testing the coil's resistance with a multimeter, checking for loose or corroded connectors, and scanning for related codes.
6. How do I fix the P2304 code on a 2016 GMC Sierra?
Repairs may include replacing the faulty ignition coil, repairing or replacing damaged wiring or connectors, cleaning corroded terminals, or, in rare cases, replacing the ECM.
7. How much does it cost to fix the P2304 code on a 2016 GMC Sierra?
Repair costs vary, but replacing an ignition coil typically costs $100–$300, while wiring repairs can range from $50–$200 depending on the severity of the damage.
8. Can a bad spark plug cause the P2304 code on my 2016 GMC Sierra?
A bad spark plug is unlikely to trigger this code directly, but it can contribute to misfires, which might complicate diagnosing the ignition coil issue.
9. What tools are needed to troubleshoot the P2304 code on a 2016 GMC Sierra?
You’ll need an OBDII scanner, a digital multimeter, and basic hand tools to inspect and test the ignition coil and its circuit.
10. How can I prevent the P2304 code from recurring on my 2016 GMC Sierra?
Regular maintenance, such as inspecting ignition components during tune-ups and ensuring wiring and connectors are in good condition, can help prevent this code from reoccurring.
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