P059F 2014 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 2014 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 2014 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 2014 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 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 P059F 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 P059F 2014 GMC Sierra Code
1. What does the OBDII code P059F mean on a 2014 GMC Sierra?
The P059F code indicates an issue with the performance of the Active Grille Air Shutter 1, which is designed to optimize aerodynamics and engine temperature.
2. What are the common symptoms of the P059F code?
Symptoms may include a check engine light, reduced fuel efficiency, or unusual airflow noises from the grille area.
3. What causes the P059F code to appear?
Common causes include a malfunctioning grille shutter motor, damaged wiring or connectors, or debris obstructing the grille shutters.
4. Can I drive my 2014 GMC Sierra with the P059F code?
Yes, but it’s not recommended for long-term driving as it may reduce fuel efficiency and affect engine cooling.
5. How is the P059F code diagnosed?
A mechanic will use a scan tool to confirm the code, inspect the grille shutter system for damage or obstructions, and test the shutter motor and related wiring.
6. How do I fix the P059F code on my GMC Sierra?
Repairs may include clearing debris from the shutters, replacing the grille shutter motor, repairing damaged wiring, or updating the vehicle’s software.
7. What tools are needed to repair the P059F code?
Common tools include an OBDII scanner, multimeter for electrical testing, and basic hand tools for removing and inspecting the grille assembly.
8. Does the P059F code affect engine performance?
It may indirectly affect performance by reducing fuel efficiency and potentially causing higher engine temperatures if airflow is restricted.
9. What is the cost of repairing the P059F code?
Repair costs can vary but typically range from $200 to $600, depending on whether the shutter motor or other components need replacement.
10. Can a software update fix the P059F code on a 2014 GMC Sierra?
In some cases, a software update from the manufacturer may resolve the issue if it’s related to system calibration or programming errors.
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