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#2
01-15-2007, 03:49 PM
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Re: Trailblazer 02 trouble code PO495
The cooling fan relay sends a Pulse Width Modulation (PWM) signal (12-14 volts) to the cooling fan by the cooling fan clutch supply voltage circuit. The Powertrain Control Module (PCM) uses the PWM signal, which controls the speed of the cooling fan by controlling the position of the oil control valve inside the clutch. If the cooling fan RPM is to high when the PCM is commanding 0%, DTC P0495 will set. If you need further help. Let me know, Brandon
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#3
01-15-2007, 03:49 PM
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Re: Trailblazer 02 trouble code PO495
Unfortunately this is a very common GMT360 chassis code. I dont know the exact wording of P0495, but it basically means your engine cooling fan clutch is toast. That code will pop up when the PCM does not like the RPM's it's seeing from the fan clutch. These fan clutches are yet another cut-rate gem of a part purchased by GM.
 Typically dealer r/r charge is ~$600. You can do it yourself with a parts store or eBay clutch for less than half of that. (oops! good call Brandon! you beat me to it!)Joel
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Trailblazer 02 trouble code PO495
