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Diagnostic Code P1491

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  #1  
Old 10-29-2007, 08:53 PM
ldmd64
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Default Diagnostic Code P1491

Anyone have ideas code cam on two days ago feels a little sluggish, 2002 dodge 1500, 4.7 L, loaded.
 
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  #2  
Old 10-29-2007, 09:24 PM
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Default RE: Diagnostic Code P1491

"Radiator Fan Ctrl Relay Circ" Maybe the computer thinks the fan's misbehaving, so it backs off the power?
 
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Old 10-29-2007, 09:39 PM
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Default RE: Diagnostic Code P1491

This may sound strange, but I have seen this code many times. Check all fusesin the power distribution center under the hood. I bet you find a blown fuse...
 
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Old 10-29-2007, 09:43 PM
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Default RE: Diagnostic Code P1491

I think that it is fuse # 39.
 
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Old 03-31-2009, 07:06 PM
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Bump -

Just had this happen, headed out to check the Fuse.
 
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Old 03-31-2009, 08:23 PM
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update: Fuse was blown, replaced still didn't fix. manual says relay could also be bad. ordered up a relay should be in by thursday
 
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Old 01-13-2010, 05:03 PM
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I know this is an older thread but it is just what I have going on right now. Code p1491 and a blown #39 25a fuse ( a/c condenser fan motor relay ). will get fuse tomorrow and see if anything else acts up. however I have two questions my scanner says code p1491 is "mfg installed emission control system" also would this have anything to do with my heat/ blend door or something acting up...NO HEAT. if so that would be great 'cause I dont wanna tear into this dash! and this is on my 02 3rd gen
 

Last edited by seabass202; 01-13-2010 at 05:17 PM.
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Old 01-13-2010, 05:28 PM
ramhunter9
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wow!! a fella that used the search function before posting a new thread ...I give you a big AT-A BOY on this one ...come on guys lets help him out....i know he is a 2nd genner maby this can be moved over their fo support??
 
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Old 01-14-2010, 05:29 PM
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I replaced the fuse, it is holding, probably just to much resistance one frozen morning and it popped.
 
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Old 11-15-2012, 12:00 PM
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I'm having the same problem, has anyone successfully fixed the issue?

02 Ram 1500, 4.7 automatic, almost 167k miles
Check engine light is on. Fan was not working and fuse 39 was blown. Replaced the fuse, swapped the relay, and cleared the CEL. Now the fan works, but the CEL stays on with the same p1491 code. I've read about other issues with the wiring inside the fuse box corroding. Think this could be related? Open to suggestions.
 
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