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Discussion Starter · #1 ·
My folks recently bought an '05 Envoy XL with the 4.2L I6 and are going to the beach (600 miles) Saturday and today the CEL came on with a p0480 code and I'm doing some investigation before they go. Can anyone tell me what the possible factors were that caused this code?

Sorry, I don't know of any other symptoms (I know this is a cooling fan circuit code) and they haven't really complained of any (been towing the boat to the lake) but this light periodically comes and goes.

Thanks,
Hokie
 

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Welcome! A quick search for that code here on trailvoy would reveal the prime suspect - chafed wires in the fan clutch wiring harness, ESPECIALLY if the issue is intermittent. Not always easy to remove the fan clutch. Are you a DIY person? If so, run another search on fan clutch and get out your tools and beer.

The harness is item #5



Here's a TSB on the issue:

#05-06-02-012B: Service Engine Soon (SES) or Check Engine Light On, DTC P0480,
P0526/P1481/P1484 Set (Replace Engine Cooling Fan Wiring Harness) - (Oct 19, 2006)






Subject:
Service Engine Soon (SES) or Check Engine Light On, DTC
P0480/P0526/P1481/P1484 Set (Replace Engine Cooling Fan
Wiring Harness)


Models:
2004-2006 Buick Rainier
2002-2006 Chevrolet TrailBlazer, TrailBlazer EXT
2002-2006 GMC Envoy, Envoy XL
2004-2005 GMC Envoy XUV
2005-2006 GMC Envoy Denali, Envoy XL Denali
2002-2004 Oldsmobile Bravada
2005-2006 Saab 9-7X





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This bulletin is being revised to add DTC P1484. Please discard Corporate Bulletin Number 05-06-02-012A (Section 06 Engine/Propulsion System).



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Condition
Some customers may comment that the Service Engine Soon (SES) or Check Engine light is illuminated. This condition may be intermittent and upon investigation, the technician may find either DTC P0480, P0526, P1481 or P1484 set.


Cause
This condition may be caused by the cooling fan harness chaffing against the plastic guide it routes through. This contact may damage the insulation of the wires enclosed in that harness.
Correction
Replace the engine cooling fan harness using the procedure listed below.

Remove the cooling fan. Refer to the Cooling Fan and Shroud Replacement procedure in the Engine Cooling sub-section of SI.
Place the cooling fan assembly on a bench.
Disconnect the harness electrical connector from the cooling fan clutch.
Remove the harness from the plastic guide while feeding the wires out of the slot.
Before installing the new harness, wrap the affected area on the wires with electrical tape to keep the protective sleeve in place. Be sure to keep the tape approximately 25 mm (1 in) away from the connector so the wires can be fed into the slot.
Feed the wires into the slot and install the harness to the plastic guide.
Connect the harness electrical connector to the cooling fan clutch.
Install the cooling fan. Refer to the Cooling Fan and Shroud Replacement procedure in the Engine Cooling sub-section of SI.


Parts Information


Part Number

89024920

Description

Harness Assembly, Engine Cooling Fan Wiring
 

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It's easier than taking out the radiator just in front of it. :D

If you have little hands and bendy wrists, you might be able to get between the fan blades and worm it out. I put some anti-sieze on my fan clutch mounting nut a few removals ago and I can get it out in five minutes now.
 

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My folks recently bought an '05 Envoy XL with the 4.2L I6 and are going to the beach (600 miles) Saturday and today the CEL came on with a p0480 code and I'm doing some investigation before they go. Can anyone tell me what the possible factors were that caused this code?

Sorry, I don't know of any other symptoms (I know this is a cooling fan circuit code) and they haven't really complained of any (been towing the boat to the lake) but this light periodically comes and goes.

Thanks,
Hokie
Hi,

It happened with my brother's Envoy. It appeared that the water pump bearing went damaged and caused the fan clutch get damaged too. My advice is to check the pump first. If it shakes sidewise or up and down, change it ang reset the code and check again. If the SES comes back again, change the harness.
 

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Discussion Starter · #6 ·
It's easier than taking out the radiator just in front of it. :D

If you have little hands and bendy wrists, you might be able to get between the fan blades and worm it out. I put some anti-sieze on my fan clutch mounting nut a few removals ago and I can get it out in five minutes now.
You know this is what really kills me. Granted I've never designed an engine compartment but I'm a tooling / machinery design engineer and we design everything to a simple standard called "ease of maintenance." There are a million ways they could have designed that harness so that it could be VERY easily accessed but instead it's a pain in the butt. Do they do it on purpose???
 
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