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OBD2 dead

7umberjackZac

7umberjackZac

Go Kart Newbie
Location
Pittsburgh, PA
Car(s)
Gti
I had my original battery die and refuse to charge up at all overnight. I had to jump the car. I have JB4 constantly plugged into the port.

Car develops lighting malfunction error after getting new battery bigger better -interstate 48 AGM. Headlights are just on when the car is on, no control over them.

OBD2 port still provides info to my JB4 via the app but can't connect obd11 or vagcom to clear codes.

Also pulled first EPC light while cruising on highway but was able to clear it with JB4.

Had local guy check over fuses and nothing. But he was too busy to really dig into the car. Guy thought maybe JB4 backfed into the port when jumped. Thoughts?
 
The Fed

The Fed

Old Guys Rule
Location
Florida
I would have powered the car and set the JB4 to bypass before starting it or replacing the battery. And did you set the car's charging module to AGM?
 
7umberjackZac

7umberjackZac

Go Kart Newbie
Location
Pittsburgh, PA
Car(s)
Gti
Couldn't set it after new battery. Part of issue. Found the fuse though. The backwards facing 10 amp was blown and replaced

 
golfdave

golfdave

Autocross Champion
Location
Scotland (U.K.)
Car(s)
Mk7 Golf GT Estate
When you jumped the car did you connect the negative to the battery or the bayonet clamp on the bulkhead behind the battery?....
 
G

George Ab

Drag Racing Champion
Location
Pacific NW
Yes, that fuse SC5 is for the OBD. Now that it is sorted, do go in and change battery type and Ah if changed, I like to put date in battery serial number field. I just did this on a BMW earlier this week, so much harder then on a VW.
 
7umberjackZac

7umberjackZac

Go Kart Newbie
Location
Pittsburgh, PA
Car(s)
Gti
golfdave said:
When you jumped the car did you connect the negative to the battery or the bayonet clamp on the bulkhead behind the battery?....
Click to expand...

Just to the battery terminals

George Ab said:
Yes, that fuse SC5 is for the OBD. Now that it is sorted, do go in and change battery type and Ah if changed, I like to put date in battery serial number field. I just did this on a BMW earlier this week, so much harder then on a VW.
Click to expand...

Yes in canbus gateway (19) adaptions - battery adaption you can set the new battery info
 
KevinC

KevinC

Autocross Champion
Location
The land of Wyatt Earp & Doc Holliday
Car(s)
'19 Golf R, '21 M2c
lumberjackzac said:
Just to the battery terminals
Click to expand...

 
golfdave

golfdave

Autocross Champion
Location
Scotland (U.K.)
Car(s)
Mk7 Golf GT Estate
lumberjackzac said:
Just to the battery terminals
Click to expand...


Even if you don't have stop/start (eco function)..its not advisable to do this on a modern car..too many electronics to FUBAR...
 
7umberjackZac

7umberjackZac

Go Kart Newbie
Location
Pittsburgh, PA
Car(s)
Gti
George Ab said:
Yes, that fuse SC5 is for the OBD. Now that it is sorted, do go in and change battery type and Ah if changed, I like to put date in battery serial number field. I just did this on a BMW earlier this week, so much harder then on a VW.
Click to expand...
Took the time to do that shortly after. So far no issues

Sent from my SM-N960U using Tapatalk
 
7umberjackZac

7umberjackZac

Go Kart Newbie
Location
Pittsburgh, PA
Car(s)
Gti
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