P0695
UniversalFan 3 Control Circuit Low
Medium SeverityThis code indicates that the engine control module (ECM) or powertrain control module (PCM) has detected a low voltage condition in the control circuit for the cooling fan 3. This typically means the module is unable to properly activate the third cooling fan, which can lead to engine overheating if not addressed.
⚠️ Before You Begin (Safety First)
Always allow the engine to cool completely before working on any cooling system components. Be aware that cooling fans can activate unexpectedly, even with the engine off; disconnect the battery before beginning any inspection or repair to prevent injury. Hot coolant and engine surfaces can cause severe burns.
Common Symptoms
- Check Engine Light illuminated
- Engine overheating, especially in stop-and-go traffic
- Cooling fan 3 not operating or operating intermittently
- A/C system not cooling effectively (if fan 3 is related to condenser fan)
Common Causes
- Faulty cooling fan 3 relay
- Open or short in the fan 3 control circuit wiring
- Corroded or loose electrical connectors
- Faulty cooling fan 3 motor
- Problem with the engine control module (ECM) or powertrain control module (PCM)
- Blown fuse for the cooling fan circuit
Frequently reported on: General/Universal
Diagnostic Steps
- Inspect the fuse for the cooling fan circuit (refer to your vehicle's owner's manual for location and rating). Replace if blown.
- Locate and test the cooling fan 3 relay. You can often swap it with a known good, identical relay from another non-critical system (e.g., horn relay) to see if the issue resolves. If not, replace the relay.
- Visually inspect the wiring and connectors leading to the cooling fan 3 for any signs of damage, corrosion, or looseness. Repair as necessary.
- With the engine off and cool, try to manually spin the fan blades to check for any binding or resistance. If stuck, the fan motor may be faulty.
- If comfortable and knowledgeable with electrical testing, use a multimeter to check for voltage at the fan connector and continuity in the control circuit wiring (refer to a service manual for proper pin-out diagrams).
👨🔧 When to Call a Professional
If basic diagnostics (fuse, relay, wiring check) do not resolve the P0695 code, or if you suspect a faulty fan motor or PCM, it is best to consult a professional mechanic. Advanced diagnostic tools may be needed to pinpoint intermittent electrical issues or internal PCM faults.
Commonly Asked Questions
What does 'Fan 3 Control Circuit Low' mean?
It means the vehicle's computer has detected a low voltage signal in the electrical circuit that controls the third cooling fan, suggesting the fan isn't receiving the proper signal to operate.
Is it safe to drive with a P0695 code?
Driving with this code is risky as it indicates a potential issue with engine cooling. If the engine overheats, it can cause severe and costly damage. Monitor your temperature gauge closely and avoid driving long distances or in heavy traffic until repaired.
How can I identify which fan is 'Fan 3'?
The specific numbering of cooling fans (Fan 1, Fan 2, Fan 3) can vary by manufacturer and vehicle model. You'll typically need to consult a vehicle-specific service manual or wiring diagram to correctly identify which fan corresponds to 'Fan 3' in your system.
Can a bad fan motor cause the P0695 code?
Yes, a faulty fan motor can sometimes draw too much current or create an open circuit, which the PCM could interpret as a 'low control circuit' condition, leading to the P0695 code.
After replacing the relay and fuse, the code returned. What's next?
If simple component swaps don't fix it, the problem likely lies in the wiring (a break or short) between the PCM and the fan/relay, or a fault within the fan motor itself. In some cases, a problem with the PCM's driver circuit could be the cause, requiring professional diagnosis.