BCM codes HELP!!

[Orangewhipple]

I need someone’s help. I have a 19 GT with a gen5 whipple. Car has been fine for months. It’s tuned by Lund. So 4 weeks ago I went to Ford and had my sync updated. Left the dealer and driving for a few miles all of a sudden the dash starts going crazy. Look at the codes on my ngauge and I have p0557, u0121, u0212, u1012. I turn the car off and everything goes away until I start driving for little. It’s even went off after driving then came back on. I know the dealer so they took it in and started chasing. Checked grounds. Even installed a new apim. The hard part with the car is that they can’t drive the car with IDS connected because of the tuner locking then out so only way to do it is to load stock tune on and read modules nothing with ignition on. Like I said we have been chasing this for 4 weeks and I’m lost at this point. Honestly thinking about putting car back to stock and telling for fix it or buy it back

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[W.O.T. Stang]

This is a CANbus communication issue. any code that begins with a "U" is a loss of communications at or between modules.

You need to find a technician that has a deep understanding of how to diagnose this problem. It will be narrowed down to a module and my guess is that the sync update overwrote the firmware that was already being modified by the tune.

However, the only module the lund tune will modify is the PCM, so this is quite confusing. As with any diagnosis, the common link needs to be found as to what changed to cause your problems.

 

[W.O.T. Stang]

Here is the network topology of all of the modules on a 2019 Mustang. It's going to be very hard to help diagnose from here, but i'm trying to find a common link to the codes you are getting, what the programming did exactly, and how the network is aligned.

 

[17Magnetic5.0]

Try reloading your stock tune and then the Lund tune back in again. Maybe they overwrote something and returning it back to stock and uploading your tune back may help. Just a wild guess but can’t hurt to try.

 

[W.O.T. Stang]

The U1012, U0121, have to do with ABS module communication. And the P0557 may have something to do with it as well. (the brake booster pressure sensor in line with the vacuum line from the booster to the manifold.) It's a shot in the dark, but make sure that connector is plugged in. It shouldn't be causing a communication issue, but it's something simple to check.

Also check the fuse for the ABS module. I'm not sure which one it is currently, as i do not have service data in front of me, but no power to that module will set these codes for sure.

 

[Orangewhipple]

Try reloading your stock tune and then the Lund tune back in again. Maybe they overwrote something and returning it back to stock and uploading your tune back may help. Just a wild guess but can’t hurt to try.

Did that a few times. Thanks

 

[Orangewhipple]

thank you. What stat are you in? I’ll pay you lol. I’m going to see what I can find latter. I did check the fuse. Installed new booster pressure censor to. That 5amp fuse is also what whipple has to tap into for power for that coolant pump

 

[Cobra Jet]

I’d be willing to bet also when the Tech updated SYNC, he did an update to other modules, which as stated above could have overwritten the Lund Tune and screwed some of the communications between modules and sensors.

If you had absolutely NO issues before taking it to the Dealership - the above is 100% the issue with Tech’s software or firmware update.

Even with tunes like the Ford Performance and the 2012-13 BOSS Track Key tunes; in those docs it is specifically stated not to perform certain updates because it will overwrite the added “tune”... causing multiple module and PCM conflicts. There’s specific steps that have to be followed IF the car has an added tune and there’s to be PCM or BCM updates.

Did you tell your Dealership the car had a loaded tune before they performed any software or firmware updates?

Did you reach out to Lund yet?

 

[W.O.T. Stang]

thank you. What stat are you in? I’ll pay you lol. I’m going to see what I can find latter. I did check the fuse. Installed new booster pressure censor to. That 5amp fuse is also what whipple has to tap into for power for that coolant pump

I live quite far from you, otherwise i'd gladly help you. It seems strange to me that they would have you tap into only a 5 amp fuse for the coolant pump. Any reasonable size pump would draw more than 5 amps on start up.

I will definitely try to think about your problem some more. I am mostly concerned as to what is causing the no communication to the ABS module, and if it's also affecting the steering column control module.

Does anything else in the car not work? turn signals? hazards? wipers? horn? any little details like that help to try to pinpoint the problem.

Again, i cannot promise i can solve the problem, just trying to offer some advice with the knowledge i have and the information you give me.

 

[K4fxd]

You need to put the stock tune back in and grab FORscan or tow it to ford so they can use IDS and reset all the modules.

I've run into communications faults after flashing before. Resetting the offending module has always fixed it.

I believe Lund does more than just the PCM/TCM

 

[K4fxd]

For me it has been the SCCM module that fixes things.

 

[Orangewhipple]

i also noticed that it’s not reading tire pressure censors and it Locke me out on drive modes

 

[Orangewhipple]

I did lund is saying that their tune has nothing to do the the BCM

 

[Orangewhipple]

we have an IDS at my house I’m going to try that tonight. I’ll keep updated

 

[Orangewhipple]

not sure if I mentioned it but here is the really wired part. So the lights all come on, stop turn the car off, restart it and everything is gone. Drive it again for a mile or so and everything comes back on. I’ve even had everything come on and then turn off while driving then come on again

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