P0694: Fan 2 Control Circuit High Voltage
The P0694 code indicates that the Engine Control Module (ECM) has detected a high voltage condition in the control circuit of the cooling fan 2 relay. This typically means the circuit voltage is above the expected range, often due to a short to power, a faulty relay, or a wiring issue. The ECM monitors the fan control circuit for proper voltage levels; when it sees excessive voltage, it sets this code to alert the driver of a potential electrical problem that can affect engine cooling.
01. Most Common Causes
- Short to power in the fan 2 control circuit
- Faulty cooling fan 2 relay
- Damaged wiring or connector
- Faulty ECM (rare)
02. Symptoms You Will Notice
- Check Engine Light illuminated
- Engine overheating or higher than normal operating temperature
- Cooling fan running continuously or not at all
- Possible reduced fuel economy
03. 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, corrosion, or shorts.
Step 3: Test the fan 2 relay and control circuit voltage with a multimeter to identify high voltage source.
Step 4: Repair or replace any faulty components, clear the code, and test drive to verify repair.
04. Commonly Affected Makes
05. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive with this code as it can lead to engine overheating and potential damage. Have the issue diagnosed and repaired promptly.
How much does it cost to fix?▼
The cost typically ranges from $50 to $150 for parts and labor, depending on the cause (e.g., relay replacement vs. wiring repair).