P059F 2015 GMC Sierra Code - Active Grille Air Shutter 1 Performance
Quick Answer
The active grille air shutter system closes shutters in the front grille to enhance vehicle aerodynamics in driving situations where cooling and A/C loads are relatively low and high levels of front-end airflow are not required. Common causes include Check for debris obstructing the Active Grille Air Shutter, Faulty Active Grille Air Shutter, Active Grille Air Shutter harness is open or shorted. 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
- P059F 2015 GMC Sierra indicates Active Grille Air Shutter 1 Performance.
- Common causes
- Common causes include Check for debris obstructing the Active Grille Air Shutter, Faulty Active Grille Air Shutter, Active Grille Air Shutter harness is open or shorted.
- 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 P059F 2015 GMC Sierra Description
The dual active grille air shutter system consists of two aero shutter mechanisms located in the front grille for controlling the amount of air flowing through the grille. It includes three wires; ground, power, and a Local Interconnect Network (LIN) Bus serial data circuit from the ECM to the shutter actuator. The ECM determines shutter state based on various vehicle conditions such as vehicle speed, coolant temperature, fan state, refrigerant system pressure, A/C compressor state, and ambient temperature. The ECM has the ability to command each shutter individually to the open or closed positions through communications on the LIN Bus.
The actuators are powered by an ignition circuit that is active when the key is in the RUN position. The vehicle may have to be driven for up to 13 minutes at speeds greater than 41 km/h (25 mph) before a shutter begins to move. If low ambient temperature is detected, the shutters will remain in the closed position.
The Diagnostic Trouble Code (DTC) will be set if the desired Active Grille Air Shutter Position achieved has exceeded the number of attempts.
What are the Possible Causes of the DTC P059F 2015 GMC Sierra?
- Check for debris obstructing the Active Grille Air Shutter
- Faulty Active Grille Air Shutter
- Active Grille Air Shutter harness is open or shorted
- Active Grille Air Shutter circuit poor electrical connection
- Faulty Engine Control Module (ECM)
How to Fix the DTC P059F 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 P059F 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.
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Frequently Asked Questions about P059F 2015 GMC Sierra Code
1. What does the OBDII code P059F mean on a 2015 GMC Sierra?
P059F indicates a performance issue with Active Grille Air Shutter 1, which is responsible for optimizing airflow and engine efficiency.
2. What are the common symptoms of code P059F on a GMC Sierra?
Symptoms may include a check engine light, reduced fuel efficiency, engine overheating, or unusual airflow noises.
3. What causes the P059F code to appear?
Common causes include a malfunctioning grille shutter actuator, damaged wiring or connectors, debris obstructing the grille shutters, or a failed control module.
4. Can I drive my 2015 GMC Sierra with a P059F code?
While the truck may still be drivable, ignoring the issue could lead to reduced fuel efficiency or engine overheating, especially in extreme temperatures.
5. How do I diagnose the P059F code on my GMC Sierra?
Start by inspecting the grille shutters for damage or obstructions, check the wiring and connectors for faults, and test the shutter actuator for proper operation.
6. How much does it cost to fix the P059F code on a GMC Sierra?
Repair costs can range from $150 to $500, depending on whether you need to replace the grille shutter actuator, repair wiring, or address other related issues.
7. Can a dirty or clogged grille shutter cause the P059F code?
Yes, debris or dirt buildup can obstruct the grille shutters and cause them to malfunction, triggering the P059F code.
8. How is the Active Grille Air Shutter related to fuel efficiency?
The grille shutters help reduce aerodynamic drag and optimize engine temperature, improving overall fuel efficiency.
9. What tools are needed to fix the P059F code on a GMC Sierra?
You may need an OBDII scanner, multimeter, and basic hand tools for inspecting and replacing the grille shutter components.
10. Do I need to reprogram the control module after fixing the P059F code?
In most cases, reprogramming isn’t required, but clearing the code with an OBDII scanner and confirming the repair is essential.
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