Hello, I am new to this forum and wanted to ask for input from anyone wiser than I am.

I recently got a 2017 F-150 5.0 XLT from a dealership, and it had a service charging system notification but seemingly no issues. It started and ran fine every time. There is also no check engine light on. I took it to auto zone to test the alternator and battery, and both came up positive with no issues. I then took it to a mechanic and they told me the alternator needed replaced, so I let him do it, and the "service charging system" light is still on. He proceeded to print me off a diagnostic report and told me there was a wiring issue, but he would have to search to find it and couldn't give me an estimated price for the repair. Before I take it back to him with a blank check, I was wondering if anyone could confirm or deny what he told me, and if he is correct, maybe give me some things to check so I could possibly fix it myself or at least give him a good starting point so it wouldn't take him so long. By the way, if you couldn't tell already, I'm not very mechanically inclined, so please be patient with me LOL.

The diagnostic report is showing the following codes:
1.B1438:03-08. BCMII- Battery Current Sensor
1.B1083:07-08. FCIM- Recirculation Damper Motor
1.P0625:00-6C. PCM- Generator Field/F Terminal Circuit Low

Is it possible that a wiring issue is causing all of these codes?

Thank you an advance for any input. Glad to be a part of this Forum!

 

B1438 is Battery Current Sensor and the :03 subtype indicates an issue with the PWM signal. Check to see if the battery current sensor has be unplugged. This is a common way of defeating the Auto-Start-Stop. If not unplugged, it could be a wiring issue or a sensor failure.

B1083 is Recirculation Damper Motor and :07 is indicating a mechanical failure. This damper controls the intake air for the HVAC (fresh air or recirculating). Has nothing to do with the charging circuit but is obviously not working properly.

P0625 is Generator Field/F Terminal Circuit Low. This could easily be a bad connector right at the alternator.

If your purchase included a warranty, you definitely should take the truck back to the dealership and get them to fix the problems, especially the Recirculation Damper Motor issue as this is a major job to change out.

 

Wait is the 5.0 supposed to have start-stop feature?? I thought that was only on the smaller engines offered in the truck. Mine has never done this, but I did check to see if the battery current sensor was plugged in and it indeed was.

The heating and cooling in the truck work perfectly fine as far as I can tell.

Thank you for the feedback. The battery sensor doesn't seem too hard to replace so would you recommend doing that or checking something else first?

 

I believe you are correct that your truck doesn't have A-S-S. As mentioned, check to make sure the sensor electrical connector has not been disconnected. Some people have simply disconnected the sensor falsely believing the BMS (Battery Monitoring System) undercharges the battery. The battery current sensor is easy to swap out and does not require any installation programming.

You may think your HVAC is working properly but the intake door could be stuck in one position. Don't be fooled by the recic light illuminating in the switch. That does not indicate anything other than you have pressed the button. If you don't hear a change in the system when switching back and forth than its not working. The entire dash has to be removed to get at that actuator (motor) to replace it. Something I'm sure you don't want to do.