What it means
Cooling Fan 2 Control Circuit Low: the control-circuit voltage is below the expected range. Reduced cooling-fan control can let the engine or A/C condenser overheat.
At a glance
- Usually lights the check-engine light
How it works
The engine controller monitors the control circuit for Cooling Fan 2, a separate fan from Fan 1 that may assist engine or condenser cooling. P0693 sets when Fan 2's control voltage is below the expected range, often due to a grounded control wire or a fault in the Fan 2 relay circuit.
Common causes
Most likely first.
- Fan 2 relay defective
- Wiring shorted to ground
- Connector pins corroded - high contact resistance
Symptoms
- Cooling fan may not operate as commanded
- Engine or A/C condenser may overheat
How to diagnose it
- Record freeze-frame data and check coolant temperature, A/C request, and Fan 2 command data to establish whether the controller was asking Fan 2 to run.
- Inspect the Fan 2 connector, relay socket, wiring, and ground-side control wire for corrosion, loose pins, or insulation touching ground.
- Use scan-tool output controls, if available, to command Fan 2 and observe its response separately from Fan 1.
- Test the Fan 2 relay and control circuit using the vehicle wiring diagram and the manufacturer's procedure.
- Check the Fan 2 control wire for a short to ground and verify the controller output only as directed by the manufacturer.
Common fixes
- Clean and secure corroded Fan 2 connector or relay-socket terminals.
- Repair a Fan 2 control wire shorted to ground.
- Repair chafed or damaged wiring in the Fan 2 circuit.
- Replace the Fan 2 relay if it fails the specified test.
Can I keep driving?
Avoid driving if the temperature gauge rises or the engine overheats, especially in slow traffic or with the A/C on. Stop safely if temperatures climb, since loss of Fan 2 cooling can contribute to engine overheating.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.