P3425 2018 GMC Sierra Code - Cylinder 4 Deactivation Solenoid Valve Control Circuit
Quick Answer
The P3425 diagnostic trouble code (DTC) for a 2018 GMC Sierra relates to the Cylinder 4 Deactivation Solenoid Valve Control Circuit. Common causes include Faulty cylinder 4 deactivation solenoid valve, Damaged or corroded wiring/connectors, Defective 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
- P3425 2018 GMC Sierra indicates Cylinder 4 Deactivation Solenoid Valve Control Circuit.
- Common causes
- Common causes include Faulty cylinder 4 deactivation solenoid valve, Damaged or corroded wiring/connectors, Defective 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.
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Code P3425 2018 GMC Sierra Description
The P3425 diagnostic trouble code (DTC) for a 2018 GMC Sierra relates to the Cylinder 4 Deactivation Solenoid Valve Control Circuit. This code indicates a problem with the circuit responsible for controlling the deactivation solenoid valve in cylinder 4 of the engine. In vehicles equipped with cylinder deactivation systems, such as GM's Active Fuel Management (AFM) or Dynamic Fuel Management (DFM), certain cylinders can be disabled under light load conditions to improve fuel efficiency. The deactivation solenoid valve is crucial for this process, as it controls the flow of oil to deactivate the lifters in the corresponding cylinders.
Common Causes of P3425 2018 GMC Sierra
- Faulty cylinder 4 deactivation solenoid valve
- Damaged or corroded wiring/connectors
- Defective engine control module (ECM)
- Sensor issues related to cylinder deactivation system
- Lack of oil pressure to operate the solenoid valve
Symptoms of P3425 2018 GMC Sierra
- Rough idling
- Reduced power output
- Poor fuel economy
- Engine misfires
- Check Engine Light illuminated
How to Fix P3425 2018 GMC Sierra
- Begin by diagnosing the specific cause of the issue using a scan tool to pinpoint the exact fault.
- Inspect the wiring and connectors for any damage or corrosion, repairing or replacing as necessary.
- Test the cylinder 4 deactivation solenoid valve for proper operation and replace if found to be faulty.
- Check and potentially replace the engine control module (ECM) if deemed defective.
- Clear the DTC and test drive the vehicle to ensure the issue has been resolved.
Cost to Fix P3425 2018 GMC Sierra
The typical repair costs for addressing a P3425 code on a 2018 GMC Sierra can vary depending on the specific cause of the issue. Parts such as a new solenoid valve or ECM can range from $100 to $500, with labor costs typically adding another $100 to $300. Overall, the total repair bill could amount to $200 to $800. It's important to note that these are rough estimates, and actual costs may vary based on factors such as location, shop rates, and parts availability. It's recommended to consult with a qualified mechanic or dealership for a more accurate cost assessment.
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Frequently Asked Questions about P3425 2018 GMC Sierra Code
1. What does the OBDII code P3425 mean on a 2018 GMC Sierra?
P3425 indicates an issue with the Cylinder 4 Deactivation Solenoid Valve Control Circuit, often related to the Active Fuel Management (AFM) system.
2. What are the common symptoms of code P3425 in a 2018 GMC Sierra?
Symptoms may include reduced engine performance, poor fuel economy, an illuminated check engine light, and engine misfires.
3. What causes the P3425 code to appear on a 2018 GMC Sierra?
Common causes include a faulty cylinder deactivation solenoid, wiring issues, low oil pressure, or a malfunctioning engine control module (ECM).
4. Can low oil pressure cause the P3425 code in a 2018 GMC Sierra?
Yes, low oil pressure can prevent proper operation of the AFM system, triggering the P3425 code.
5. How do you diagnose the P3425 code on a 2018 GMC Sierra?
Diagnosis involves checking the solenoid, wiring, and connectors for damage, verifying oil pressure, and using a scan tool to monitor AFM system performance.
6. Is it safe to drive a 2018 GMC Sierra with the P3425 code?
Driving with this code may be possible but is not recommended, as it can lead to engine performance issues and potential long-term damage.
7. How is the P3425 code repaired on a 2018 GMC Sierra?
Repairs may include replacing the cylinder deactivation solenoid, addressing wiring or connector issues, and ensuring proper oil pressure.
8. Can a faulty ECM cause the P3425 code in a 2018 GMC Sierra?
While rare, a malfunctioning ECM can cause this code by failing to properly control the solenoid circuit.
9. What tools are needed to troubleshoot the P3425 code on a 2018 GMC Sierra?
Tools include a scan tool, multimeter, oil pressure gauge, and basic hand tools for inspecting and replacing components.
10. How much does it typically cost to fix the P3425 code on a 2018 GMC Sierra?
Repair costs vary but can range from $150 to $500, depending on whether the solenoid, wiring, or other components need replacement.
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