Where is the diagnostic connection on my 2009vw transpoter

check fuel pump

call the transpot company and ask them

Where did you pull this code from ? What type scan tool did you use ,or was it a code reader ? Do you know about data communication networks on modern cars ? A U codes indicate a communication problem on the data network .
U1900 CAN Communication Bus Fault-Receive Error Audio Control Module REFER to Section 418-00 . U1900 CAN Communication Bus Fault-Receive Error ABS Module REFER to Section 418-00 . U1900 CAN Communication Bus Fault-Receive Error Instrument Cluster REFER to Section 418-00 . U1900 CAN Communication Bus Fault-Receive Error SJB REFER to Section 418-00 . The thing that would make this easier to diagnose would be to have a factory scan tool or a professional grade . Need to know what modules can communicate with scan tool .Honestly ,Don't think you can fix this . Dealer or ASE certified repair shop .Do you know what C.A.N. - controller area network is ? The vehicle has 3 module communications networks:

• high speed controller area network (CAN)
• medium speed CAN
• international standards organization (ISO) 9141 communications network

The diagnostic tool connects to the communications networks through the data link connector (DLC). The DLC allows a diagnostic tool access to diagnose and test the vehicle systems of any module on the communications networks.
All 3 communications networks are connected to the DLC. This makes diagnosis and testing of these systems easier by allowing one diagnostic tool to be able to diagnose and control any module on the 3 communications networks from one common connector. The DLC can be found under the instrument panel between the steering column and the driver door. Which module doesn't communicate with scan tool ?
Symptom Chart Condition Possible Sources Action

• The anti-lock brake system (ABS) module does not respond to the diagnostic tool

• Circuit or connection in the high speed controller area network (CAN)
• ABS module

• Go To Pinpoint Test A .

• The audio unit does not respond to the diagnostic tool

• Circuit or connection in the medium speed controller area network (CAN)
• Audio unit

• Go To Pinpoint Test B .

• Circuit or connection in the medium speed controller area network (CAN)
• Audio unit

• Go To Pinpoint Test B .

• The instrument cluster does not respond to the diagnostic tool - high speed controller area network (CAN)

• Circuit or connection in the high speed CAN
• Instrument cluster

• Go To Pinpoint Test C .

• The instrument cluster does not respond to the diagnostic tool - medium speed controller area network (CAN)

• Circuit or connection in the medium speed CAN
• Instrument cluster

• Go To Pinpoint Test D .

• The powertrain control module (PCM) does not respond to the diagnostic tool

• Circuit or connection in the high speed controller area network (CAN)
• PCM

• Go To Pinpoint Test E .

• The restraint control module (RCM) does not respond to the diagnostic tool

• Circuit or connection in the international standards organization (ISO) 9141 communications network
• RCM

• Go To Pinpoint Test I .

• The smart junction box (SJB) does not respond to the diagnostic tool

• Circuit or connection in the medium speed controller area network (CAN)
• SJB

• Go To Pinpoint Test F .

• No high speed controller area network (CAN) communication

• Circuit or connection in the high speed CAN
• High speed CAN modules

• Go To Pinpoint Test G .

• No medium speed controller area network (CAN) communication

• Circuit or connection in the medium speed CAN
• Medium speed CAN modules

• Go To Pinpoint Test H .

• No international standards organization (ISO) 9141 communications network communication

• Circuit or connection in the ISO 9141 communications network circuit
• Restraint control module (RCM)

• Go To Pinpoint Test I .

• No module/network communication - no power to the diagnostic tool

• Data link connector (DLC) C251
• Bussed electrical center (BEC) fuse 4 (30A)
• Smart junction box (SJB) fuse 8 (10A)
• Circuitry
• Diagnostic tool

• Go To Pinpoint Test J .

Check with the State Dept. of Transpotation

Are you going by the gauge or is it truly overheating? If you can put a scan tool on it and check the actual temperature you may just find out that you have an electrical wiring issue or cluster problem. If not you need to get a true cooling system flush/backflush to clean out any and all obstructions (possibly in the heater core?) and then re-fill with a good coolant mix with distilled water. You've replaced your other 2 possible causes already

No problem. Email me at [email protected] is this a type 1, transpoter, or ghia?

The cables to the switch were incorrectly replaced - the kill valve isn't powered.

hi first thing i would is to check the cable

usually black smoke is a good indication of a blown head gasket check the oil to see if it look milky will look kinda brownish like chocolate milk or cocoa

My recommendation is definitely in the certified sevis because if you make a wrong conection wires can spoil the main computer