What Does P0694 Mean?
The PCM has detected that the control circuit for cooling fan 2 is reading higher than expected voltage, indicating the circuit is stuck high or has lost its ground path. This means the fan may run continuously or the PCM cannot control the fan properly. The driver may notice the fan running at full speed at all times, or conversely, the fan may not respond to PCM commands at all.
Common Causes
30%
Open ground circuit at the fan 2 relay or control module preventing the circuit from pulling low
25%
Failed cooling fan 2 relay stuck in the open or energized position
20%
Short to battery voltage in the wiring between PCM and fan relay control terminal
15%
Failed PCM fan control driver circuit (open-circuit failure mode)
10%
Corroded or disconnected connector at the relay or inline harness junction
Diagnostic Steps
1
With the engine running, use the scan tool to command fan 2 on and off while monitoring the control circuit voltage; voltage should toggle between near-battery voltage (off) and below 1V (on). A stuck-high reading confirms the fault.
2
Disconnect the fan 2 relay and measure the PCM control wire voltage with key on; if still reading high (above 10V), check for a short to B+ in the harness.
3
Verify the relay control circuit ground path by measuring resistance from the relay socket ground pin to a known-good chassis ground; should be below 0.5 ohms.
4
Substitute a known-good relay and retest fan 2 operation; if the code clears, the relay was internally failed.
5
If all external circuits test good, backprobe the PCM connector at the fan 2 control pin and verify the PCM can pull the circuit low when commanded; failure to do so indicates an internal PCM driver fault.
Estimated Repair Cost
$50 - $450
Parts + labor, varies by vehicle and location
The PCM has detected that the control circuit for cooling fan 2 is reading higher than expected voltage, indicating the circuit is stuck high or has lost its ground path. This means the fan may run continuously or the PCM cannot control the fan properly. The driver may notice the fan running at full...
The most common cause of P0694 (Fan 2 Control Circuit High) is: Open ground circuit at the fan 2 relay or control module preventing the circuit from pulling low
Typical repair costs for P0694 range from $50 to $450, depending on the vehicle, location, and whether you do it yourself or go to a shop.
If the fan cannot be controlled, the engine may overheat during low-speed or idle conditions. Conversely, a constantly running fan can drain the battery. Avoid extended city driving or idling until repaired. Highway driving at moderate temperatures is generally safe.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0694 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Engine Cooling System
Difficulty
Type
Generic (SAE)
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
