What are the common causes of P05AF?

A grille shutter B motor that runs constantly. A stuck shutter relay. A short to voltage in the shutter motor circuit. A failed shutter module. Damaged wiring to the shutter motor.

Watch grille shutter B commanded and actual position. Test the shutter motor circuit for a short to voltage. Check the shutter relay. Inspect the wiring to the motor. Replace the shutter module if the motor runs constantly. Clear the code and retest.

P05AF

Active Grille Air Shutter B Stuck On

System: Speed and idle control (P code)
Lamp: Check Engine Light
Category: Powertrain - Computer and Auxiliary Controls

What it means

P05AF means Active Grille Air Shutter B Stuck On.

Check these first

A grille shutter B motor that runs constantly
A stuck shutter relay
A short to voltage in the shutter motor circuit
A failed shutter module
Damaged wiring to the shutter motor

What to do next

Watch grille shutter B commanded and actual position
Test the shutter motor circuit for a short to voltage
Check the shutter relay
Inspect the wiring to the motor
Replace the shutter module if the motor runs constantly
Clear the code and retest

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Updated

Generic SAE J2012 definition. Last updated 2026-10-10.