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Unsure where to go from here

NuggsOnMyMind

Passed Driver's Ed
Location
Albuquerque
Car(s)
Mk7 Gti
It's not rocket science it's a simple load test. But the fact that you said you had it charged and it was still only showing 12.48 volts is a little low.
They tested it under load, after the test it read at 12.47V, so it dropped about .01V after the test. I don't think itd be a bad starter since im not getting any codes from the ecm, only about the ABS control module. When I get home Ill just give the contacts a good scrubbing just in case
 

gixxerfool

Autocross Champion
Location
New Jersey
Car(s)
2016 Golf R
Got it tested under load, its at 80% charge with 12.48V, I can try cleaning the connections, but they looked pretty clean to me.
I’m not a huge fan of the testers they use. They aren’t true carbon pile testers and can sometimes lead to false results and will end up leaving you stranded. I recently did a DSG service and when while setting up VCDS my battery puked. It was fine 5 minutes prior. So there are instances where the batteries can die very quickly and you’ll never see it.
 

jimlloyd40

Autocross Champion
Location
Phoenix
Car(s)
2018 SE DSG
It's not the voltage after the load test.
You run the load test and with the engine still running the voltage should be about 14 volts.
 

NuggsOnMyMind

Passed Driver's Ed
Location
Albuquerque
Car(s)
Mk7 Gti
It's not rocket science it's a simple load test. But the fact that you said you had it charged and it was still only showing 12.48 volts is a little low.
But I can't start the car is the thing, they've been testing just the battery this whole time, I can go get a brand new battery, just to rule that out, and I checked the connections, they are about as clean as they can be
 

NuggsOnMyMind

Passed Driver's Ed
Location
Albuquerque
Car(s)
Mk7 Gti
I’m not a huge fan of the testers they use. They aren’t true carbon pile testers and can sometimes lead to false results and will end up leaving you stranded. I recently did a DSG service and when while setting up VCDS my battery puked. It was fine 5 minutes prior. So there are instances where the batteries can die very quickly and you’ll never see it.
At this point, im just gonna bite the bullet and get a new battery, worst comes to worst at least I know its not the battery
 

NuggsOnMyMind

Passed Driver's Ed
Location
Albuquerque
Car(s)
Mk7 Gti
When mine crapped out I was miffed as I just got the car. I realized it was the original battery from 2015, so I was ok after that. 3 years is average for a battery, anything above that is doing well
I changed out the battery, got a H6 instead of an H5 and it has 730 CCA instead of 650, but car still wont start. Its still giving me the same errors as before "Electronic Stability Control (ESC)" "Tire pressure monitoring system" and I have the stability control light, engine light, EPC light, it has a steering wheel with an exclamation point next to it, and the TPMS system light. So I dont think it was the battery, but for giggles Im gonna run the obd2 again, see if i pull anything different
 

gixxerfool

Autocross Champion
Location
New Jersey
Car(s)
2016 Golf R
I changed out the battery, got a H6 instead of an H5 and it has 730 CCA instead of 650, but car still wont start. Its still giving me the same errors as before "Electronic Stability Control (ESC)" "Tire pressure monitoring system" and I have the stability control light, engine light, EPC light, it has a steering wheel with an exclamation point next to it, and the TPMS system light. So I dont think it was the battery, but for giggles Im gonna run the obd2 again, see if i pull anything different
Some of Those set because of the battery disconnect. Easy fix. When you get the car started turn the wheel all the way to the left and then all the way to the right and then back to center, it will take care of the stability light. TPMS just needs to be set through the radio.

It is Time to start checking fuses and anything you may have disturbed through this. Make sure you didnt pop a starter fuse, super unlikely, or anything. Try to clear any codes you find after documenting them and I may have missed it, can you actually talk to the engine control module?
 

gixxerfool

Autocross Champion
Location
New Jersey
Car(s)
2016 Golf R
Now it's sounding like a bad connection. Ground wire?
The invalid data received and Bus code he is getting makes me think he has lost comm with the ECM. He said there are no codes, but is it there is no comm? Some of the more generic scanners report stuff weird and no comm can look like no codes. A ground seems pretty likely, but I would expect many more low voltage codes or even high voltage codes as well with a loose ground.
 

NuggsOnMyMind

Passed Driver's Ed
Location
Albuquerque
Car(s)
Mk7 Gti
Some of Those set because of the battery disconnect. Easy fix. When you get the car started turn the wheel all the way to the left and then all the way to the right and then back to center, it will take care of the stability light. TPMS just needs to be set through the radio.

It is Time to start checking fuses and anything you may have disturbed through this. Make sure you didnt pop a starter fuse, super unlikely, or anything. Try to clear any codes you find after documenting them and I may have missed it, can you actually talk to the engine control module?
Checked all the fuses, nothing popped, thankfully, got the other lights turned off after turning wheel, lock to lock, EPC and Engine light are still on, I think my scanner can connect to the ecm, but im not sure how to tell. Cleared the codes, and scanned again and didnt get any codes. But car just doesnt wanna start. I attached a screenshot of the codes i got before I cleared them
 

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gixxerfool

Autocross Champion
Location
New Jersey
Car(s)
2016 Golf R
Checked all the fuses, nothing popped, thankfully, got the other lights turned off after turning wheel, lock to lock, EPC and Engine light are still on, I think my scanner can connect to the ecm, but im not sure how to tell. Cleared the codes, and scanned again and didnt get any codes. But car just doesnt wanna start. I attached a screenshot of the codes i got before I cleared them
The CEL will be on in a key on engine off scenario. That is normal. As for comm with the ECM, depending on the scanner, see if it reports back as no codes or if it just doesnt show up. Unfortunately, each vehicle manufacturer and scanner will treat a no comm situation a little different. Some will ignore the module and report nothing, easy to miss. Some will display it retrieved no codes and others yet will be more symptomatic with a major module be off the bus. Make sure your ECM connections are tight as well.
 

NuggsOnMyMind

Passed Driver's Ed
Location
Albuquerque
Car(s)
Mk7 Gti
The CEL will be on in a key on engine off scenario. That is normal. As for comm with the ECM, depending on the scanner, see if it reports back as no codes or if it just doesnt show up. Unfortunately, each vehicle manufacturer and scanner will treat a no comm situation a little different. Some will ignore the module and report nothing, easy to miss. Some will display it retrieved no codes and others yet will be more symptomatic with a major module be off the bus. Make sure your ECM connections are tight as well.
I can go ahead and get a higher end scanner from autozone, there are about 6 or 7 stores where I'm at, so I'm sure one of them will have a scanner that properly connects to the ecm. I only spent $60 on this scanner, and autozone's return policy is pretty good, so I'll see if I can't get a more specified one. The ECM connections I reseated them just to be sure, I'm still getting 0 DTC codes from the scanner, so after clearing them, the scanner is just getting no codes at all.
 

OryxRob

Ready to race!
Location
Middle England
Car(s)
Mk7 GTI PP Oryx
Have you got an immobiliser?
If it’s not even cranking over or clicking the starter I’d doubt it’s battery as you’ve tried 2.
 

gixxerfool

Autocross Champion
Location
New Jersey
Car(s)
2016 Golf R
I can go ahead and get a higher end scanner from autozone, there are about 6 or 7 stores where I'm at, so I'm sure one of them will have a scanner that properly connects to the ecm. I only spent $60 on this scanner, and autozone's return policy is pretty good, so I'll see if I can't get a more specified one. The ECM connections I reseated them just to be sure, I'm still getting 0 DTC codes from the scanner, so after clearing them, the scanner is just getting no codes at all.
Then most likely your ECM is fine. The problem is elsewhere. Silly question, have you checked the battery in the remote?
 
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