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So I have my 2009 in for safety cert and where I am you need an emission test before sale, which is based on scanning your OBD port. This shop is trusted by me, they don't do the etest but tried to scan for me to see if it would pass - they called and said the car won't communicate and they need to diagnose and it could be a fuse or something. I told them to leave it for now since they don't do the final test anyway.

Anyone ever heard of our cars having this issue - I can't find anything (shop is an independent Toyota specialist).

PS:
About a month ago I did get my 4wd, vsc, and engine light come on when I was in a remote location, I reset by pulling the fuse and putting t back and the car has run fine with no lights since.
 

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Hi Gryph, We meet again. Selling your Rav? Did you by chance had a remote starter or an aftermarket security system installed in the vehicle? If you do, it may be those devices that are connected to the OBD or CANBUS network interfering with it.
 

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So I have my 2009 in for safety cert and where I am you need an emission test before sale, which is based on scanning your OBD port. This shop is trusted by me, they don't do the etest but tried to scan for me to see if it would pass - they called and said the car won't communicate and they need to diagnose and it could be a fuse or something. I told them to leave it for now since they don't do the final test anyway.

Anyone ever heard of our cars having this issue - I can't find anything (shop is an independent Toyota specialist).

PS:
About a month ago I did get my 4wd, vsc, and engine light come on when I was in a remote location, I reset by pulling the fuse and putting t back and the car has run fine with no lights since.
The power for the OBD port has to come from somewhere. I'd do a simple fuse check first.
 

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So I have my 2009 in for safety cert and where I am you need an emission test before sale, which is based on scanning your OBD port. This shop is trusted by me, they don't do the etest but tried to scan for me to see if it would pass - they called and said the car won't communicate and they need to diagnose and it could be a fuse or something. I told them to leave it for now since they don't do the final test anyway.

Anyone ever heard of our cars having this issue - I can't find anything (shop is an independent Toyota specialist).

PS:
About a month ago I did get my 4wd, vsc, and engine light come on when I was in a remote location, I reset by pulling the fuse and putting t back and the car has run fine with no lights since.
Check the fuse you pulled first...
 

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The power on the DLC port is only there to supply power to OBD devices that required external power supply to work like those plug in door lock module or BT OBD scanner for use with a smart phone.


Since the dash light comes on at random interval either right on driving or after a short period of time, that eliminated the problem with any power supply issue cause by a blown fuse ( most of the time ). The biggest symptom is the ECU are not communicating over the network. There may be too much noise or data stream that is not readable by the scanner. Issue like this is cause by a faulty ECU, network gateway or most likely an aftermarket devices that communicate over the CANBUS network. For those owner that had vehicle equipped with a radio system that shows on screen information about the car performance, those radio when malfunction will also cause the same problem. By unplugging each connected device one at a time , will help eliminate the working one and isolate the defective device.
 
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