P2CBA: Fan 2 Overspeed

What it means

Cooling fan 2 exceeds the calibrated maximum speed. Indicates load lost (broken fan blade) or supply voltage above nominal.

At a glance

• Usually lights the check-engine light
• The engine or gearbox may go into limp mode

How it works

Cooling fan 2 moves air through the radiator and condenser when commanded by the control system. This code sets when fan 2 turns faster than its calibrated maximum, which can result from a broken or detached blade or excessive supply voltage.

Common causes

Most likely first.

1. Fan blade broken or detached
2. Alternator overvoltage

Symptoms

• Check-engine light
• Cooling fan unusually loud or running faster than expected

How to diagnose it

1. Use freeze-frame data and live fan 2 command and speed to confirm whether overspeed occurs continuously or only under certain conditions.
2. With the engine off, inspect fan 2 blades and hub for a broken, loose or detached blade before operating the fan again.
3. Check the fan 2 connector and wiring for damage or an unintended direct power feed.
4. Measure charging system voltage and fan 2 supply under operation, comparing with the manufacturer's specification.
5. If voltage is normal and the blade assembly is intact, test fan 2 speed feedback and control operation.

Common fixes

• Replace a broken or detached fan 2 blade or fan assembly.
• Repair wiring that is feeding fan 2 incorrectly or bypassing its control.
• Correct a charging system fault if voltage is above the manufacturer's specification.
• Replace fan 2 or its speed feedback component if it reports overspeed despite correct power and an intact assembly.

Can I keep driving?

Avoid driving if fan 2 has a damaged or loose blade, since it could break further and damage nearby parts. If the fan is simply running fast, monitor engine temperature and have the cause addressed soon.