DTC code P1641 on a LT4
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Joined: Sep 2007
Posts: 83
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From: Tucson AZ
DTC code P1641 on a LT4
Hi. Have a 1996 LT4 w/o electronic A/C. Check engine light came on. Scanned w/ Autotap reader. It shows P1641 which is "Fan Control Relay 1 Control Circuit". I don't find anything in my Factory shop manual about this relay and associated circuitry. Has anybody seen this code before? The autotap says it won't pass emissions with this light displayed! Aaargghh. I need to find it and fix it. Thanks.
Thread Starter
Advanced
Joined: Sep 2007
Posts: 83
Likes: 1
From: Tucson AZ
Thanks Roger. I found the relay laying on it's side by the radiator. A previous owner had siliconed it into the original spot after the cheap plastic relay retainer broke. Found another relay by it in the same condition but it hadn't broke completely loose yet. Going to the dealer tomorrow to hopefully buy two of the retainer clips to properly afix the relays. I'll check the circuit with the info that you pointed out. Thanks again for your help.
