P2B32: Fan 2 Stuck On

What it means

Cooling fan 2 stays in the activated state when commanded off. The relay or control driver is welded or stuck on.

At a glance

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

How it works

Cooling Fan 2 is controlled through a relay or control driver when the module requests extra airflow. This code sets when Fan 2 remains active after it has been commanded off, which can be caused by welded relay contacts, a stuck-on driver, or a fan obstruction.

Common causes

Most likely first.

1. Fan relay contacts welded closed
2. Output driver stuck on
3. Carbon or debris buildup preventing free movement

Symptoms

• Check-engine light
• Cooling fan runs after the engine is switched off
• Unusual fan noise or increased battery drain

How to diagnose it

1. Review freeze-frame data and Fan 2 command status to confirm it was commanded off when the fault occurred.
2. After shutdown, observe whether Fan 2 continues running and note how long it remains on; keep clear of the blades because the fan can start unexpectedly.
3. Inspect Fan 2 for debris or damage that may restrict movement, and check its wiring and connector for damage or contact with a power source.
4. Inspect and test the Fan 2 relay for contacts stuck closed using the manufacturer's procedure.
5. If the relay and wiring are sound, test the Fan 2 control circuit and driver against the manufacturer's specification.

Common fixes

• Remove debris that interferes with Fan 2 movement.
• Repair damaged Fan 2 wiring or connector terminals that keep it powered.
• Replace the Fan 2 relay if its contacts are stuck closed.
• Repair the fan control circuit or replace a failed control driver after confirming the fault.

Can I keep driving?

A brief drive may be possible if engine temperature stays normal, but Fan 2 running after shutdown can drain the battery and prevent a restart. Avoid leaving the vehicle unattended with the fan running, and stop if temperature rises or the fan creates a hazard.