P0402 2014 GMC Sierra Code - Exhaust Gas Recirculation Flow Excessive
Quick Answer
The Exhaust Gas Recirculation (EGR) valve is controlled by the Engine Control Module (ECM). Common causes include Faulty Exhaust Gas Recirculation (EGR) Valve, EGR solenoid valve harness is open or shorted, EGR solenoid valve circuit poor electrical connection. Severity is Moderate - service should be scheduled soon. The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
- What it means
- P0402 2014 GMC Sierra indicates Exhaust Gas Recirculation Flow Excessive.
- Common causes
- Common causes include Faulty Exhaust Gas Recirculation (EGR) Valve, EGR solenoid valve harness is open or shorted, EGR solenoid valve circuit poor electrical connection.
- Severity
- Moderate - service should be scheduled soon.
- Can I drive?
- The vehicle may still be drivable for short trips if it runs normally, but avoid hard driving and repair it soon.
Code P0402 2014 GMC Sierra Description
What are the Possible Causes of the DTC P0402 2014 GMC Sierra?
- Faulty Exhaust Gas Recirculation (EGR) Valve
- EGR solenoid valve harness is open or shorted
- EGR solenoid valve circuit poor electrical connection
How to Fix the DTC P0402 2014 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 P0402 2014 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 P0402 2014 GMC Sierra Code
1. What does the OBDII code P0402 mean on a 2014 GMC Sierra?
The P0402 code indicates that the Exhaust Gas Recirculation (EGR) system is detecting excessive flow of exhaust gases into the intake manifold.
2. What are the symptoms of code P0402 on a 2014 GMC Sierra?
Symptoms may include a rough idle, reduced engine performance, decreased fuel efficiency, the Check Engine Light turning on, and possible stalling or hesitation.
3. What causes the P0402 code to appear on a 2014 GMC Sierra?
Common causes include a stuck-open EGR valve, a clogged or malfunctioning EGR sensor, damaged EGR passages, or issues with the EGR solenoid.
4. Can a dirty EGR valve cause the P0402 code on a GMC Sierra?
Yes, a dirty or carbon-clogged EGR valve can cause it to stick open, leading to excessive exhaust gas flow and triggering the P0402 code.
5. How do you fix the P0402 code on a 2014 GMC Sierra?
Fixes may include cleaning or replacing the EGR valve, inspecting and repairing EGR passages, replacing the EGR sensor, or addressing any wiring or connector issues.
6. Is it safe to drive a 2014 GMC Sierra with the P0402 code?
Driving with the P0402 code is not recommended, as excessive EGR flow can damage the engine over time and may cause drivability issues.
7. How much does it cost to repair the P0402 code on a GMC Sierra?
The cost depends on the specific repair; cleaning an EGR valve may cost under $100, while replacing the valve or related components can range from $200 to $600 or more.
8. Can a vacuum leak cause the P0402 code on a 2014 GMC Sierra?
Yes, a vacuum leak affecting the EGR system's controls can lead to excessive flow and trigger the P0402 code.
9. How can I prevent the P0402 code from recurring on my GMC Sierra?
Regular maintenance, including cleaning the EGR valve and passages, checking for vacuum leaks, and using high-quality fuel, can help prevent this code.
10. Will a faulty EGR temperature sensor trigger a P0402 code on a 2014 GMC Sierra?
Yes, if the EGR temperature sensor provides incorrect readings, it can falsely signal excessive flow and cause the P0402 code.
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