Code Definition

P0693 — Cooling Fan 2 Control Circuit Low

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

About P0693

P0693 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 P0693 is stored, the module has detected a signal or supply voltage lower 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 P0693 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) actuates the Cooling Fan 2 relay to help control engine and air conditioning system temperatures, and it continuously monitors the control circuit voltage to verify proper relay operation. With the fan commanded off the control circuit normally sits near battery voltage, and the PCM pulls it low to switch the relay on. DTC P0693 is set when the PCM detects the control circuit voltage remaining significantly below the expected level, indicating an unintended short to ground, shorted wiring, or a driver fault, for a defined duration. The result can be a coolin...

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