Fan 2 Control Circuit Low
The P0693 code indicates that the Powertrain Control Module (PCM) has detected a low voltage condition in the control circuit of the cooling fan 2 relay. This typically means the circuit voltage is below the expected threshold, often due to a short to ground, faulty relay, damaged wiring, or a defective fan motor. The PCM monitors the fan control circuit for proper voltage; when it reads lower than normal, it sets this code.
1. Most Common Causes
- Faulty cooling fan 2 relay
- Short to ground in fan 2 control circuit
- Damaged wiring or connector
- Defective cooling fan motor
- Failed PCM (rare)
2. Symptoms You Will Notice
- Engine overheating
- Check Engine Light illuminated
- Cooling fan not operating or running continuously
- Reduced air conditioning performance
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm the code and check for related codes.
Step 2: Visually inspect the fan 2 relay, wiring, and connectors for damage or corrosion.
Step 3: Test the fan 2 relay and control circuit voltage using a multimeter.
Step 4: Check the fan motor operation by applying direct battery power.
Step 5: If all else is fine, test the PCM output for the fan control circuit.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with this code, as the cooling fan may not operate properly, leading to engine overheating and potential damage.
How much does it cost to fix?▼
The cost to fix P0693 typically ranges from $50 to $150 for parts and labor, depending on the root cause (relay, wiring, or fan motor replacement).
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.