Code Definition

P1064 — Low Speed Fan No BCM Response

System: Powertrain  |  Type: Manufacturer-Specific  |  Make: Holden

About P1064

P1064 is a manufacturer-specific 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 P1064 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.

P1064 is a manufacturer-specific code. The same code string on a different make may have a different meaning. Always confirm the code's definition against the vehicle's service information for the specific make and model under test.

Code Information

On these Holden vehicles the Powertrain Control Module (PCM) decides when the engine cooling low speed fan should run based on inputs such as air conditioning request, vehicle speed, and engine coolant temperature, for example low speed fan on when coolant is above about 104 degrees Celsius or with the air conditioning active below about 54 km/h. When those conditions are met the PCM sends a serial data request on circuit 1221 to the Body Control Module (BCM), asking it to earth circuit 473 and switch the low speed fan relay, and the BCM is expected to provide the earth and acknowledge back to...

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