OBD Active Grille Air Shutter B Control Circuit High
What it means
P05B3 stands for Active Grille Air Shutter B Control Circuit High. P05B3 is a P code, so the fault sits in the engine, transmission and emissions systems. For P05B3, the second digit places it in speed and idle control. For P05B3, work through the cause list below, cheapest checks first.
What to check first
For P05B3, check the wiring and connector on this circuit first, since a broken terminal gives the same reading as a failed part.
Check these first
- P05B3: Faulty sensor or actuator in the control circuit
- P05B3: Wiring, connector, or fuse problem for the affected output
- P05B3: Low or unstable system voltage from the battery or charging system
- P05B3: Failed PCM/ECM or a software error
- P05B3: Poor ground connection for the control module
What to do next
P05B3 reports from the speed and idle control system. These steps cover P05B3 in general, and the exact cause on your vehicle can differ from the cause named above.
- P05B3: Verify battery voltage and charging system health first
- P05B3: Read all related module codes with an OBD-II scanner
- P05B3: Inspect wiring, connectors, and grounds for the affected circuit
- P05B3: Test the sensor or actuator with live data and actuation commands
- P05B3: Check for PCM software updates or TSBs before replacing modules
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Updated
Generic SAE J2012 definition. Last updated 2026-08-30.