2001 3.9l v8 code b1805

05-30-2015, 02:57 AM
so my car is currently killing batteries. I had just got a brand new battery and my car ran for 3 days with it. I let it sit for 1 day and then would not start back up. the check engine light came on and 1 of the codes was b1805 when I looked it up it says lamp turn signal rear output circuit short to ground.

is that code whats causing my battery to be drained? and how do I fix it?

thanks for your help in advance.

05-30-2015, 09:53 AM
Welcome to the forum!

Are you absolutely certain of that code number and definition for your 2001 LS? I checked the lighting section of the factory service manual for a 2001 Lincoln LS and do not find B1805 listed. Keep in mind these body codes are not "generic" across all brands.

Also, you mention B1805 was "1 of the codes." Were there more codes? Do your rear turn signals work fine?


05-30-2015, 11:12 AM
the rear lights and signals all work normally the main issue is the power draining from the battery.

b1805 was not the only code to come up but I used google to find out what the code was all the tester would say is check the manual for this code.

the other codes that came up are
u1262 communication bus fault

p0172 system too rich bank 1

p0174 system too lean bank 2

p1565 speed control command switch out of range high.

now I did recently change out the passenger secondary tensioner since it was broken up real bad so I think that has something to do with the lean rich codes. those were not coming up until after that but it has been draining the battery since I got the car and until now I thought it was just a bad battery but the one now is brand new

05-31-2015, 11:47 AM
Unless your Google search specifically identified that code definition as for a Ford, I wouldn't trust the description. That format of body code is manufacturer specific and likely won't be the same from one manufacturer to the next.

Does your test specify which body system reported that diagnostic code? I check the factory service manual for the lighting, anti-theft, PATS, Audio, cruise control, ABS, air bags, traction control, and keyless entry systems and did not find B1805 listed for any of them.


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