P0693
UniversalThe Powertrain Control Module (PCM) detects a low voltage condition in the control circuit for cooling fan 2.
Medium SeverityThis code indicates that the vehicle's computer has detected an electrical issue with the cooling fan 2 control circuit, specifically a lower-than-expected voltage. This can prevent the fan from operating correctly, potentially leading to engine overheating and performance issues.
⚠️ Before You Begin (Safety First)
Always allow the engine to cool completely before working on any engine components. Disconnect the battery before checking electrical connections or replacing parts. Be cautious of rotating fan blades and hot engine parts.
Common Symptoms
- Check Engine Light illuminated
- Engine overheating
- Cooling fan 2 not operating
- AC performance issues (especially at idle)
Common Causes
- Faulty cooling fan 2 motor
- Bad cooling fan relay
- Open or short in the cooling fan 2 control circuit wiring
- Corroded or loose electrical connectors
- Faulty Powertrain Control Module (PCM) (rare)
Frequently reported on: General/Universal
Diagnostic Steps
- Inspect all related fuses for the cooling fan system and replace any blown fuses.
- Check the cooling fan 2 relay. You can often swap it with an identical, non-critical relay (e.g., horn relay) to test.
- Visually inspect the wiring harness and connectors for the cooling fan 2 for any signs of damage, corrosion, or loose connections.
- With the engine cool and battery disconnected, manually spin the cooling fan 2 to check for resistance or binding. Reconnect the battery and check if the fan engages when the engine reaches operating temperature or AC is turned on.
- If accessible and safe, test for voltage at the cooling fan 2 connector. A low voltage could indicate a wiring issue or a faulty PCM (advanced step).
👨🔧 When to Call a Professional
If you've checked the fuses, relays, and basic wiring and the problem persists, or if you are uncomfortable with electrical diagnosis, it's best to consult a certified mechanic to diagnose and repair the P0693 code.
Commonly Asked Questions
What does "Fan 2 Control Circuit Low" mean?
It means the car's computer detected a lower-than-expected voltage in the electrical circuit that controls the second cooling fan.
Can I drive with a P0693 code?
It is not recommended to drive for extended periods with this code, especially if you notice the engine overheating, as it can lead to severe engine damage.
How do I know if it's Fan 1 or Fan 2?
Most vehicles with two fans will have specific circuits and codes for each. P0693 specifically refers to "Fan 2".
Is a P0693 always a bad fan motor?
Not necessarily. It could be a faulty relay, blown fuse, damaged wiring, or corroded connector within the fan's control circuit.
What's the cheapest fix for P0693?
Often, a blown fuse or a faulty cooling fan relay is the cheapest and easiest fix. Always start with checking these components.