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What to turn off for the Flashing Battery light?

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Old 03-29-2007 | 05:04 PM
  #21  
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Originally Posted by kbracing96
Humm.... what you think is an 05 pcm must really be an 02 pcm, do you have a PN off of it?
Its definately a '05 PCM.... It the original one off my Sierra.

FWIW, the P1637 is turned off and there is no option for the P0641 & P0651.
The Alt is putting out 14.02V's as well.
Old 03-29-2007 | 06:53 PM
  #22  
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Originally Posted by LETHL_ZO6
Its definately a '05 PCM.... It the original one off my Sierra.

FWIW, the P1637 is turned off and there is no option for the P0641 & P0651.
The Alt is putting out 14.02V's as well.
We really need the P/N to help ya. I think you may have your pcm's or years mixed up. I did some checking today and dont see how this could even work?

As far as the codes...

P0641 and P0651 is not an option in 01-02 pcm, BUT IS and option in the 05 pcm... You stated its not an option?

P0622 is the F-terminal in the 05 but is not even turned on in the stock 05 Cal nor is P1637 L-terminal circut.

If its an 01-02 you need P1638 turned off... NOT P1637.

You never answered what codes you had. Check them and get the part number on the pcm.
Old 03-29-2007 | 08:06 PM
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Originally Posted by 1slowsilverado
We really need the P/N to help ya. I think you may have your pcm's or years mixed up. I did some checking today and dont see how this could even work?

As far as the codes...

P0641 and P0651 is not an option in 01-02 pcm, BUT IS and option in the 05 pcm... You stated its not an option?

P0622 is the F-terminal in the 05 but is not even turned on in the stock 05 Cal nor is P1637 L-terminal circut.

If its an 01-02 you need P1638 turned off... NOT P1637.

You never answered what codes you had. Check them and get the part number on the pcm.

I'll double check any codes and the PN tomorrow... its been a while since I looked at it but I do know it was for the F terminal. Also we flashed a '02 operating system in it.
Old 03-30-2007 | 05:50 PM
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The truck isnt throwing any codes and the P1638 was turned off. I took the PCM out but couldnt find a PN anywhere on it.
Old 03-30-2007 | 06:59 PM
  #25  
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look for the service number.Should be a sticker.
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