What are the common causes of P05B7?

A short to voltage on the shutter B supply. High resistance in the supply wiring. A failed shutter module. A corroded connector. Charging system overvoltage.

Measure the shutter B supply voltage. Test the supply wire for a short to voltage. Inspect the connector for corrosion. Check the charging system voltage. Replace the shutter module if the supply stays high. Clear the code and retest.

P05B7

Active Grille Air Shutter B Supply Voltage Circuit High

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

What it means

P05B7 means Active Grille Air Shutter B Supply Voltage Circuit High.

Check these first

A short to voltage on the shutter B supply
High resistance in the supply wiring
A failed shutter module
A corroded connector
Charging system overvoltage

What to do next

Measure the shutter B supply voltage
Test the supply wire for a short to voltage
Inspect the connector for corrosion
Check the charging system voltage
Replace the shutter module if the supply stays high
Clear the code and retest

Look up another code

Code or symptom

Enter a full code or a symptom. Press / to search. How to read a code

Type a code above, or start from a symptom or a common code.

Updated

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