Hello everyone. I am facing an issue with my John Deere 6920S. It's a 2006 model and sometimes gives a message "639 2 bif, Instrument unit not receiving any data, see dealer". When this happens the tractor drops rpm and doesn't accelerate. The problem doesn't appear so often.You have to switch off the engine and start it again. Does anyone has experience with this problem?
6920S bif code
- Thread starter john.gdk
- Start date
Tractortech
Member
- Location
- Cumbria
Now Then..
Is that a code which pops up when the tractor is in use, or have you looked into the BIF codes and it's the only code there??
Personally, I usually look at all the codes in all the controllers, note them all, then delete. Drive the tractor and see what comes back...
It's a code that pops up when the tractor is in use. When this code appears, tractor drops engine rpm and you have to switch off the engine, waiting 2 minutes amd then start the engine again. After this, everything works fine amd tractor is revving again until the code pops up again.
Tractortech
Member
- Location
- Cumbria
I'd still look at all the other codes and delete them all. Your problem could (as usual with electrical faults), be one of many things..
I deleted all the other codes, the problem still exists. Could be the can terminators in the cab?
Tractortech
Member
- Location
- Cumbria
The CAN terminators in a 2 series didn't fail as I recall, I don't think I've ever replaced one.
Have you checked the CAN high and CAN low voltages at the diagnostic socket??
Check the wiring behind the rear right hand cab pillar before you get into any complex diagnostic procedure..
Have you checked the CAN high and CAN low voltages at the diagnostic socket??
Check the wiring behind the rear right hand cab pillar before you get into any complex diagnostic procedure..
Thank you. No, I didn't check the voltages. JD dealer said me that is a common problem and I have to change the two terminators (behind the right speaker and at the bottom of the cab controls). I removed the upholstery behind the rear hand, I checked the wiring, but I can't see so much. Maybe the wiring is the problem? Or the bif?
Tractortech
Member
- Location
- Cumbria
30 series were problematic, I've never needed to change any on a 20 series, they are a different design.
However, at £203.00 the pair, it could be cheaper than having the dealer out,,,,
However, at £203.00 the pair, it could be cheaper than having the dealer out,,,,
So, I don't replace them. Could be the bif?30 series were problematic, I've never needed to change any on a 20 series, they are a different design.
However, at £203.00 the pair, it could be cheaper than having the dealer out,,,,
Tractortech
Member
- Location
- Cumbria
Have you got another tractor to swap it with as a diagnostic??
Good Evening.
Back to the problem, now the code comes on more often and if I leave it without turning off and restarting the engine, after two minutes the fuel indicator on the left side of the cluster comes on without showing any code. Note here that there is a small fuel leak in the fuel filter. Could this have anything to do with the 639 2 bif code that appears first?
Back to the problem, now the code comes on more often and if I leave it without turning off and restarting the engine, after two minutes the fuel indicator on the left side of the cluster comes on without showing any code. Note here that there is a small fuel leak in the fuel filter. Could this have anything to do with the 639 2 bif code that appears first?
- Location
- East Sussex
I have a 6920. Kept clicking the reverser into neutral and limited power. Noted that the left indicator and engine heat light didn’t work along with some others. As I was away from a manual I started investigating and found the wires had rubbed through behind the hitch release lever in the corner of the cab. It was sparking a little which is how I found it. Pushed a piece of plastic down in there to protect it so I could get home.
Did your tractor show the same code as mine before? 639 2 bif?
Μany times the indicator continues to come on even though i have turned off the indicator on the road
- Location
- East Sussex
I didn’t check for codes. Had an idea what the problem was from posts here and was lucky I saw/heard the spark.
Many thanks for your reply. I removed the rear panel behind the hitch release lever but I can't see the wiring.
- Location
- East Sussex
It’s a bundle about 25mm thick and really tight between corner cab pillar and hitch release handle mounting base.
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