P0693 Cooling Fan 2 Control Circuit Low

P0693 points to a low condition in the cooling fan 2 control circuit. The fan 2 control path is below the expected voltage or feedback range.

Code details

Generic OBD-II · P0

System: Computer
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not assume fan 2 is unnecessary on a cool engine; many tests require scan-tool command or A/C pressure conditions.

Symptoms of P0693

Check-engine light, sometimes with several unrelated codes at once.
Warning lights, a no-start, or intermittent electrical faults.
Communication or module-reset problems on a scan tool.

Common causes of P0693

Low battery voltage, poor grounds, corroded connectors, or blown fuses.
Wiring or network (CAN bus) faults between modules.
A module software/programming issue, or rarely a failed controller.

Useful checks before replacing parts

Check fan 2 command, relay or module output, control voltage, current draw, coolant temperature, A/C pressure request, battery voltage, and freeze-frame data.
Inspect fan 2 fuse feed, relay contacts, ground circuit, motor resistance, connector heat damage, wiring continuity, and fan module terminals.
Command fan 2 where supported and compare operation, voltage, and current draw with fan 1 or other speed stages.

Related OBD-II codes

These nearby computer entries can help compare wording and pin down the fault area.