Scangauge: Showing Codes That Start With Letter "U"

[Aaron]

When I press SCAN my Scangauge II shows that there are no codes and everything is normal. However, after a few minutes in the same screen it starts to show codes that start with the letter "U" and they are constantly changing. U3F91, U3174, U2F72, U2C6F, U2568, U2B6E, U3F90 and so on....what the heck is this?

I exit that screen and go to scan again and NO CODES FOUND --READY-- everything normal. No check engine light. It's as if the Scangage II is reading something as I am driving along that isn't problem related like the "P" codes.

[ceric]

Aaron,
It looks like unicodes to me.
Other than that I can't help much. Sorry.

[Aaron]

Originally Posted by ceric

Aaron,
It looks like unicodes to me.
Other than that I can't help much. Sorry.

What are unicodes? Anything to worry about?

[Bob64]

Those codes don't exist in the bentley prius repair manual... I'd assume its a scangauge bug.

[Aaron]

Originally Posted by Bob64

Those codes don't exist in the bentley prius repair manual... I'd assume its a scangauge bug.

Good.

[fnc]

Originally Posted by Aaron

When I press SCAN my Scangauge II shows that there are no codes and everything is normal. However, after a few minutes in the same screen it starts to show codes that start with the letter "U" and they are constantly changing. U3F91, U3174, U2F72, U2C6F, U2568, U2B6E, U3F90 and so on....what the heck is this?

I exit that screen and go to scan again and NO CODES FOUND --READY-- everything normal. No check engine light. It's as if the Scangage II is reading something as I am driving along that isn't problem related like the "P" codes.

Hello,
Uxxxx codes indicate a communication error between electronic control units. The four digits after the refer to the module complaining about the problem and what the complaint is.

One thing to keep in mind is the CAN protocol on the Prius changed in the later models. Some scan tools, (CAN tools) set faults just by attempting communication on the bus. I have seen thismany times.

I will post an example once I locate the pics.

[fnc]

Here are some codes I pulled from a 2005 Prius that would not start. It had multiple communication errors.

[nerfer]

What version of the SGII do you have (MORE>MORE>VERSION or something like that)?
Is the vehicle turned on (not just in Acc mode) when you looking for these codes?
<edit: reread the post, you are driving> Make sure everything is securely connected and the cable isn't being too compressed by something. I'm not sure if these comm errors are between ECUs in the car or between the ECUs and the SGII, but it's an easy place to start.

[Aaron]

Originally Posted by nerfer

What version of the SGII do you have (MORE>MORE>VERSION or something like that)?
Is the vehicle turned on (not just in Acc mode) when you looking for these codes?
<edit: reread the post, you are driving> Make sure everything is securely connected and the cable isn't being too compressed by something. I'm not sure if these comm errors are between ECUs in the car or between the ECUs and the SGII, but it's an easy place to start.

Cable being compressed? Really? I do have the cable tightly wedged around the steering column.

The strange thing is that everything is running perfectly normal with the car. No warning lights or anything. I just find it strange that I can see "U" codes jumping around changing every second. It seems to me that this is more of a SGII issue that does not affect the car.

It might be interesting to note that I switched some of my x-gauges to PASSIVE rather than active and I had less errors.

I am running Version 3.15 (not 3.15*). Brand new out of the box.

I'm not too knowledgeable on the difference between active and passive codes. Can someone explain this too me? Which is better?

[Aaron]

Originally Posted by fnc

Hello,
Uxxxx codes indicate a communication error between electronic control units. The four digits after the refer to the module complaining about the problem and what the complaint is.

One thing to keep in mind is the CAN protocol on the Prius changed in the later models. Some scan tools, (CAN tools) set faults just by attempting communication on the bus. I have seen this many times.

I will post an example once I locate the pics.

I think this is what is happening. But why isn't it affecting my Prius in a bad way? It starts up fine.