p0526 fan speed sensor circuit - Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum



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Go Back   Chevy TrailBlazer, TrailBlazer SS and GMC Envoy Forum > 2002 - 2009 TrailBlazer/Envoy Tech > 02-09 Vortec 4.2L I-6 Engine and Drivetrain > OEM Issues

OEM Issues Original Equipment Repairs and/or Problems

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  #1  
Old 05-01-2019, 11:10 PM
pers0n pers0n is offline
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2005 GMC Envoy SLT
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p0526 fan speed sensor circuit

I've had the fan clutch replaced 3 times. I know its the harness but I had that replaced twice. The fan slows and speeds up fine. Had a mechanic I know personally show it. Is there anything to do, to just get rid of this code for good?
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  #2  
Old 05-01-2019, 11:22 PM
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EnvoyBoy2004 EnvoyBoy2004 is offline
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Two things to try, first swap relays #45 & 46 in the underhood fuse box. Then see if fault goes away.

Second check for a 5VDC reference voltage on pin E (Grey wire) of the connector on fan clutch, and check for a ground on pin C (Grey/Wht wire).
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Old 05-02-2019, 12:57 AM
pers0n pers0n is offline
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2005 GMC Envoy SLT
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Quote:
Originally Posted by EnvoyBoy2004 View Post
Two things to try, first swap relays #45 & 46 in the underhood fuse box. Then see if fault goes away.

Second check for a 5VDC reference voltage on pin E (Grey wire) of the connector on fan clutch, and check for a ground on pin C (Grey/Wht wire).
I made the mistake of buying the fuse and not switching it instead and then was stuck with the new one.

I dont know how to use a voltmeter. Is this done when the car is running?
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Old 05-09-2019, 07:38 AM
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rcott01 rcott01 is offline
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I put electric fans from a 98-02 f-body in mine. Other than having the factory fan tuned out (I own hp tuners), I have a total of around $35 in it. I wired a 3 relay setup and very rarely even hear them running, plus adds a little hp and mpgs. I have a cammed 6.0 in mine and it has never got hot even on a 95 day with the a/c on sitting in traffic.
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