Code Definition

P0694 — Cooling Fan 2 Control Circuit High

System: Powertrain  |  Type: Generic (OBD-II Standard)  |  Make: Holden

About P0694

P0694 is a generic (obd-ii standard) powertrain diagnostic trouble code recorded for Holden vehicles. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P0694 is stored, the module has detected a signal or supply voltage higher than the expected operating range.

Scanning & clearing: A generic OBD-II scan tool will usually read and clear powertrain (P) codes. For live data, freeze-frame capture, and bi-directional tests you may need a more capable scan tool that supports the vehicle's ECM protocol.

Because P0694 is a generic OBD-II code, its base definition is shared across manufacturers. The specific diagnostic steps, reference values, and repair procedures can vary by vehicle, and the TaT Diagnostic Assistant includes verified procedures submitted by working technicians.

Code Information

The powertrain control module (PCM) controls Cooling Fan 2 through a fan relay and monitors the fan relay control circuit voltage to confirm the relay de energises correctly when the fan is commanded off. With the fan off the control circuit should not show battery voltage. DTC P0694 is set when the PCM senses a voltage notably higher than expected on the control circuit, suggesting the relay contacts are stuck closed or the circuit is fed from a constant power source, for longer than the specified threshold, often around 5 seconds. The typical condition is a fan stuck running or a control cir...

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