P1652 whats wrong? - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 12-28-2005, 02:15 AM   #1
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Default P1652 whats wrong?

i was headin home aftr a night of wet driving fun and my check engine light was on. i hooked up my $99 code reader and it said p1652 twice, and it said auxillary inputs. but on the tech info it said: DTC P1652 Cooling Fan Relay 2 Control Circuit are those one and the same? if so, what does it mean?
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Old 12-28-2005, 02:35 AM   #2
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Your PCM can tell if the cooling fan relay is removed by reading feedback voltage through the relay coil.
First thing to try is find the relay unplug it and clean the pins and put it back in and see if code resets.

PS: What brand and model of code reader do you have?
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Old 12-28-2005, 02:11 PM   #3
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Old 01-20-2006, 09:08 AM   #4
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hope i dont get killed for bringin back a semi old post. but this problem is occuring almost constantly.
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Old 01-20-2006, 09:30 AM   #5
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Have you checked the relay? Do your fans operate normally?
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Old 01-20-2006, 09:31 AM   #6
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It'* not that old..

Did you follow the original advice and pull the relay, clean and reinstall?

That would be my first suggestion of the morning.
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Old 01-20-2006, 09:35 AM   #7
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Quote:
Originally Posted by willwren
Have you checked the relay? Do your fans operate normally?
whats the procedure for cleaning it. i know that they work, cuz the car doesnt ovr heat and ive heard them run.
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Old 01-20-2006, 09:41 AM   #8
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Hmmm, working normally.....I would need to look up the diagnostics in the manual at home. Maybe someone has the manual on them. (I'll pm a guy who keeps the 97 book in his trunk)
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Old 01-20-2006, 10:30 AM   #9
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could the fact that my pcm is located near my crossover pipe cause this?
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Old 01-20-2006, 10:33 AM   #10
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If it'* that close and not properly shielded from the heat..you might have melted some wiring. That could cause major problems.
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