Code Definition

P0495 — Cooling fan speed high

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

About P0495

P0495 is a generic (obd-ii standard) powertrain diagnostic trouble code. It belongs to the P-prefix family of codes, which covers engine, transmission, emissions, or fuel-system faults.

When P0495 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 P0495 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) sets this code when it detects that the cooling fan is running at a higher speed than commanded. This may be caused by an electrical fault, a stuck fan relay, or a malfunctioning fan clutch, leading to excessive cooling, increased noise, and reduced fuel efficiency.

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