P0495 Fan Speed High code - Chevrolet Forum - Chevy Enthusiasts Forums

TrailBlazer 2002-2009
The TrailBlazer, originally introduced as an upscale Blazer, was produced from 2002 to 2008 with a powerful I6 engine and with a monster V8 offered in the Trailblazer SS
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P0495 Fan Speed High code

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Old April 16th, 2018, 9:26 PM
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Default P0495 Fan Speed High code

My 2006 Trailblazer is showing the P0495 Fan Speed High code. The light came on while towing a VERY heavy trailer up a steep incline in moderate heat. The guy at Autozone who read the code said their computer suggests a thermostat repair, but I suspect that it could have been high due to the load and the heat. Could this be the case? The fan sounds normal to me now, it's cycling on an off at a relatively normal interval.
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Old April 16th, 2018, 11:48 PM
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the code sets when the pcm is commanding the fan clutch off but the fan is operating at high speed. this code by itself does not indicate a bad thermostat.
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