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2017 f150 XL RCSB 3.5L non turbo
truck started lighting up the dash with service warnings all of a sudden took it to the garage and the mechanic scanned it and had no idea what the codes meant anyone able to help me ? I’ve got to replace all the breaks soon so I’m hoping it’s related to that
First one is the BCM not getting proper voltage. The other modules get power from the BCM , so downstream device DTC would be typical.
I'd say start with the PCM and then check wiring for any faults if the PCM checks out.
BTW if the mechanic had no idea what those codes meant, hire a new mechanic.
Low voltage on the BCM can be bad battery, charging system fault, or the PCM is going bad.
I always check batt voltage first and look for the voltage jump (alternator working) when you start the truck. If those are within normal range, it's the PCM.
My previous comment, I was assuming battery and alternator were already checked. Thats mechanic 101 stuff for low voltage error.
BTW if the mechanic had no idea what those codes meant, hire a new mechanic.
Low voltage on the BCM can be bad battery, charging system fault, or the PCM is going bad.
I always check batt voltage first and look for the voltage jump (alternator working) when you start the truck. If those are within normal range, it's the PCM.
My previous comment, I was assuming battery and alternator were already checked. Thats mechanic 101 stuff for low voltage error.
im not sure what BCM and PCM mean but all the warnings on my dash have to do with the stability control and breaking systems, all the systems are working so I wasn’t as concerned as I could be I also didn’t really get the mechanic to look into the problem he only quickly looked into it in the parking lot
I had a similar issue with random unrelated warnings showing up and throwing DTC everywhere.
It was the PCM (Power Control Module). It feeds power to the BCM (Body Control Module) a.k.a fuse box with brains.
If the PCM is not sending proper voltage to the BCM, it can cause modules to throw errors because they cannot function properly with the voltage they are currently getting.
You need to test the battery and charging system first. If those are good, check the PCM.
I had a similar issue with random unrelated warnings showing up and throwing DTC everywhere.
It was the PCM (Power Control Module). It feeds power to the BCM (Body Control Module) a.k.a fuse box with brains.
If the PCM is not sending proper voltage to the BCM, it can cause modules to throw errors because they cannot function properly with the voltage they are currently getting.
You need to test the battery and charging system first. If those are good, check the PCM.
.
Respectfully, the PCM does not send main power voltage to any of the Modules.
They have their own dedicated >fused< sources. One in the engine bay and one behind the passenger side kick panel.
The PCM only addresses them with control signals both directions on the Buses.
All the power comes from the Battery and Alternator system to the fuse panels.
The U 3013-16 is the important code. It has >detected the low voltage condition< and is not the fault. It is only reporting it.
The other two codes will clear when the low voltage condition is cleared.
Find out why the system voltage is low. Good luck.
Help, mechanic doesn't recognize these codes
