What are the common causes of P05B1?

An open in the active grille shutter B actuator. A broken wire in the shutter B control circuit. Corrosion or water in the shutter B connector. A failed shutter B actuator motor. A physical jam stopping shutter B from moving.

Inspect the active grille shutter B connector for corrosion. Check shutter B for a physical jam or obstruction. Test the shutter B actuator control wires for an open. Command shutter B through its range with a scan tool. Replace the active grille shutter B actuator if it stays dead. Clear the code and retest.

P05B1

Active Grille Air Shutter B Control Circuit/Open

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

What it means

P05B1 means Active Grille Air Shutter B Control Circuit/Open.

Check these first

An open in the active grille shutter B actuator
A broken wire in the shutter B control circuit
Corrosion or water in the shutter B connector
A failed shutter B actuator motor
A physical jam stopping shutter B from moving

What to do next

Inspect the active grille shutter B connector for corrosion
Check shutter B for a physical jam or obstruction
Test the shutter B actuator control wires for an open
Command shutter B through its range with a scan tool
Replace the active grille shutter B actuator if it stays dead
Clear the code and retest

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Updated

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