I have a 2018 F-150 and today decided to check the condition of the battery. What I found baffles me. With the engine and ignition switch off, there was a 2.2 amp draw on the battery. Anyone have any thoughts on what might be causing the amp draw?

Thank you

 

You need to let the truck sit undisturbed for a time to let all the modules go into "sleep mode". Here is the test procedure.

 

The OP is asking what, not how. What is drawing the power after turning off the engine. Why would it need to draw any power?
I don't think he's trying to determine if there's an abnormal parasitic draw while in sleep mode.

 

Read the first four NOTES in the PDF I posted.

 

I had that PDF file already.

What's not clear in the OPs post is when he made the measurement of 2.2 amps. Was it before or after the truck went suposibly into sleep mode which takes about 40 minutes.

My assumption is that he wants to know what is drawing power during the 40 minutes before it goes into sleep mode. The PDF indicates interior light and two others remaining on continuously pulling 1 amp. They don't but that's not what remains powered up during the 40 minutes. When I lock my doors with my key fob the interior light goes out immediately. Even if I don't lock the doors it goes out in 20 seconds along with the running lights.

The PDF does not identity what's happening during the 40 minutes.

 

There are all sorts of devices that could be contributing to the 2.2 A draw OP is seeing. An open door could illuminate courtesy lighting. A fob within proximity could wake the PCM, RTM, GWM and other modules, drawing much more amperage than the standby. Fuel pump could be priming the fuel system.

Depending on the options that the truck has, there can easily be 20 or more modules, any one of which could be contributing to the draw if they are not in standby mode.

 

Good info, thanks.

 

Thank you to all that replied. When I checked the current draw on the battery, the vehicle had been sitting for two days so no engine activity since about 645 pm on Saturday (5.7.22), the check was done in the early afternoon on Monday (5.9.22.) I was in and out of the vehicle several times throughout the day on Sunday Monday (doors opening and closing.) I will follow-up with the testing that is described in the pdf. that was posted.

Thanks again.

 

When you open the driver's door the truck wakes up and prepares for startup. If you have keyless ignition the fuel pump will even prime when the door is open. Ford diesels will light the glow plugs for one cycle in cold weather when the driver's door is opened. Even when you don't start the engine the truck fully power's up when you open the door. It doesn't matter how long the truck has been sitting, 1 hour or 1 month as soon as the door is opened the truck wakes up, powers up and prepares for startup. If you don't drive it you can see it power down after the door is closed and doors locked. The parking lights go off, the screen goes dark and the IP goes dark but there are still other modules powered up. The bad part is that Fords seem to take the longest to fully go to sleep to check for a power draw.

If the truck sits for days and has no problem starting there is no unusual power draw.

 

What was the issue after all, OP? I have a 2.4 amp draw. A shop tested the obvious things (BCM, alternator, others), disconnected the fuse boxes, and nothing changed.