What are the common causes of P028B?

A cooling fan that is stuck or dragging. A faulty cooling fan relay. A weak battery or charging system. Corroded fan connector terminals. A binding fan blade or bearing.

Command the cooling fan on with a scan tool and watch for rotation. Check the fan relay and fuse. Spin the fan blade by hand to check for binding. Inspect the fan connector for corrosion. Replace the cooling fan if it is stuck or dragging. Clear the code and retest.

P028B

Charge Air Cooler Cooling Fan Performance/Stuck Off

System: Injector circuits (P code)
Lamp: Check Engine Light
Category: Powertrain - Fuel/Air Metering

What it means

P028B means Charge Air Cooler Cooling Fan Performance/Stuck Off.

Check these first

A cooling fan that is stuck or dragging
A faulty cooling fan relay
A weak battery or charging system
Corroded fan connector terminals
A binding fan blade or bearing

What to do next

Command the cooling fan on with a scan tool and watch for rotation
Check the fan relay and fuse
Spin the fan blade by hand to check for binding
Inspect the fan connector for corrosion
Replace the cooling fan if it is stuck or dragging
Clear the code and retest

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Updated

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