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OBD code help

4.8K views 5 replies 4 participants last post by  Jetta Jim  
#1 ·
Hello all,

I recently went to autozone to get a check engine light read on my 2007 JETTA, the code they got back was U0001. They told me it was not in their database, when i looked up the code online it tells me its a High Speed CAN Communication Bus error, What exactly does this mean? and what should i do?
 
#2 ·
That "U" means it is a communication error. Each module on the car needs to talk to one another in order to provide the great drive-ability that the public expects. When that "U0001" code exists, it means the module can't talk to each other. When this happens the modules are smart enough to know and depending on the module certain things happen. ABS won't function if it can't communicate, depending on manufacturer most transmissions will go into direct drive i.e. 3rd gear. This way you aren't stuck in first and revving the motor to drive 45mph, and you can still take off from a stop even if it takes a little longer. Its a fail safe, no worries. But an issue still exists. Check the OBD II connector for corrosion in the high speed CAN bus terminal, terminal #6. If your looking straight at the connector, count six over from the top left. I've seen corrosion in the connector (doesn't take much), the wires pulled out of the back, loose connections.

Try clearing the code out and see if it comes back. If it does then you have a problem in the CAN BUS (either a short in the wire, a bad module, a broken wire, etc.....) and you need to take it to a qualified mechanic that can check that kind of issue.
 
#6 ·