Debris, snow, or ice physically blocking the shutter blades and preventing movement; A failed shutter position sensor or faulty sensor wiring inside the shutter assembly; Corroded, chafed, or disconnected electrical connector at the shutter motor/sensor; A binding or broken shutter linkage or actuator motor that cannot move the blades; A software calibration issue in the powertrain control module that misinterprets the sensor signal; Damage to the shutter assembly from a minor impact or road hazard

DTC codes / P05xx · Vehicle speed, idle control and auxiliary inputs / P059A

P059AActive Grille Air Shutter A Position Sensor Circuit

Q: What does code P059A mean?

Active Grille Air Shutter A Position Sensor Circuit. P059A indicates that the powertrain control module has detected an implausible or out-of-range signal from the position sensor of active grille air shutter 'A', which is the shutter assembly that regulates airflow through the front grille. The computer compares the sensor voltage against expected values for the commanded shutter position and sets this code when the two do not agree.

P059A indicates that the powertrain control module has detected an implausible or out-of-range signal from the position sensor of active grille air shutter 'A', which is the shutter assembly that regulates airflow through the front grille. The computer compares the sensor voltage against expected values for the commanded shutter position and sets this code when the two do not agree.

SystemPowertrain

Code typeGeneric (all makes)

SeverityLow

Fix difficultyIntermediate

AreaVehicle speed, idle control and auxiliary inputs

Symptoms you may notice

Illumination of the check engine light, often with no other noticeable symptoms
The active grille shutters may remain stuck in the open or closed position
A slight decrease in fuel economy if the shutters stay open at highway speeds
Overheating tendency in slow traffic if the shutters stay closed and block airflow
A visible shutter assembly that does not move when the engine is started or when commanded by a scan tool
In some vehicles, a message on the driver information center about reduced engine power or aerodynamics

Common causes, most likely first

Debris, snow, or ice physically blocking the shutter blades and preventing movement
A failed shutter position sensor or faulty sensor wiring inside the shutter assembly
Corroded, chafed, or disconnected electrical connector at the shutter motor/sensor
A binding or broken shutter linkage or actuator motor that cannot move the blades
A software calibration issue in the powertrain control module that misinterprets the sensor signal
Damage to the shutter assembly from a minor impact or road hazard

How to diagnose and fix it

Inspect the grille shutters for debris, ice, or physical damage and clear any obstructions
Check the electrical connector at the shutter assembly for corrosion, tightness, and damaged pins
Use a scan tool to command the shutter through its full range and observe the position sensor voltage for smooth operation
Backprobe the sensor signal and ground wires to verify reference voltage and continuity to the powertrain control module
If the sensor signal is erratic or absent, replace the shutter assembly or sensor as a unit
Check for technical service bulletins or software updates for the powertrain control module related to grille shutter operation
After repair, clear the code and perform a relearn or calibration procedure if required by the manufacturer

What technicians check before replacing shutters

A surprisingly common cause is a small stone or road debris wedged between the shutter blades, which mimics a failed sensor and costs nothing to fix.
The position sensor is often integrated into the shutter assembly, so a faulty sensor may require replacing the entire unit rather than a separate part.
Cold weather can cause ice buildup that temporarily sets this code, and the code may clear on its own after the ice melts without any repair.
A weak or failing battery can cause low voltage to the shutter motor, leading to a position sensor code that disappears after the battery is replaced.
Some vehicles require a grille shutter calibration procedure after any repair or battery disconnect, and skipping it will cause the code to return immediately.

Can I keep driving with P059A?

It is generally safe to continue driving with this code because the shutters default to a safe position, but avoid sustained high-speed driving or heavy towing until repaired to prevent potential overheating or reduced fuel economy. If the engine temperature gauge begins to rise, pull over and stop the engine.

Tools that help

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Guidance is general and written for all OBD-II vehicles. Exact tests and values vary by model, so confirm the fault before replacing parts.