P059F 2018 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 2018 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 2018 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 2018 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 2018 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 2018 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 2018 GMC Sierra Code
1. What does the OBDII code P059F mean on a 2018 GMC Sierra?
P059F indicates an issue with the Active Grille Air Shutter 1 Performance, meaning the system is not operating as expected to regulate airflow for engine cooling and aerodynamics.
2. What are the common symptoms of the P059F code?
Common symptoms include reduced fuel efficiency, a check engine light, overheating under certain conditions, or no noticeable symptoms at all.
3. What causes the P059F code to appear?
Possible causes include a malfunctioning grille shutter actuator, damaged wiring or connectors, physical obstruction in the grille shutters, or a fault in the powertrain control module (PCM).
4. How do I diagnose the P059F code on my GMC Sierra?
Start by visually inspecting the grille shutters for obstructions or damage. Then, use an OBDII scanner to check live data for the grille shutter system and test for proper actuator movement.
5. Can I drive with the P059F code active?
While the vehicle may still be drivable, ignoring this code can lead to reduced fuel efficiency or engine overheating, especially under high-load conditions.
6. How can I fix the P059F code?
Repairs may include replacing the grille shutter actuator, repairing damaged wiring, clearing debris, or reprogramming the PCM if needed.
7. How much does it cost to fix the P059F code?
Repair costs vary but typically range from $150 to $500, depending on whether the actuator, wiring, or other components need replacement.
8. Can I clear the P059F code without fixing the issue?
Clearing the code without addressing the root cause will likely result in the code returning, as the underlying problem remains unresolved.
9. What tools are needed to fix the P059F code?
Basic tools include an OBDII scanner, a multimeter for electrical tests, and standard hand tools for accessing the grille shutter system.
10. Is the P059F code covered under warranty for my 2018 GMC Sierra?
It may be covered if your vehicle is still under the manufacturer's powertrain or emissions warranty. Check with your local dealership for confirmation.
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