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When you say no "signal", do you mean no "ready status" from the OBD?

What are the mods, if any.

If the car runs, you have communication.

You need to explain the situation more completely.

You say the car doesn't pass smog, ergo it must be running.

Are you confusing a "Not ready" with no communication?
 

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Discussion Starter · #5 ·
When you say no "signal", do you mean no "ready status" from the OBD?

What are the mods, if any.

If the car runs, you have communication.

You need to explain the situation more completely.

You say the car doesn't pass smog, ergo it must be running.

Are you confusing a "Not ready" with no communication?
When you say no "signal", do you mean no "ready status" from the OBD?

What are the mods, if any.

If the car runs, you have communication.

You need to explain the situation more completely.

You say the car doesn't pass smog, ergo it must be running.

Are you confusing a "Not ready" with no communication?
Font Parallel History Paper Paper product
 

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Could be any # of things.
If you have an HP tuner I would look and see if the 'tune" has the DTC's turned off first.
That is what some "tuners" will do to prevent a check engine light.
Second is to disconnect any aftermarket part that plugs into the communication link.
You say you have a gauge in the middle.
What is its' function?
 

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Discussion Starter · #11 ·
Could be any # of things.
If you have an HP tuner I would look and see if the 'tune" has the DTC's turned off first.
That is what some "tuners" will do to prevent a check engine light.
Second is to disconnect any aftermarket part that plugs into the communication link.
You say you have a gauge in the middle.
What is its' function?
Reads it stuff boost , trans temp , a/f ration , misfire etc and I’m not sure it was tune by fast lane performance in Georgia
 

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The U0 codes are all informational. You can clear these out. They come back some times. They won't prevent the car from passing an OBD check. The P0 codes are definitely going to prevent you from passing. If the car has mods that include an aftermarket tune, this is probably the source of the problem. I suspect the C code is indicating that you do have a custom tune, someone shut off some aspect of the emissions system to keep the check engine light from turning on. That might prevent you from passing even if you didn't have any of the other codes.

The problem is not that OBD doesn't give a "signal". It is clearly working exactly like it's supposed to. Your problem is "downleg" of the OBD interface and has nothing to do with how OBD is working (which appears to be "working correctly").
 

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Discussion Starter · #14 ·
The U0 codes are all informational. You can clear these out. They come back some times. They won't prevent the car from passing an OBD check. The P0 codes are definitely going to prevent you from passing. If the car has mods that include an aftermarket tune, this is probably the source of the problem. I suspect the C code is indicating that you do have a custom tune, someone shut off some aspect of the emissions system to keep the check engine light from turning on. That might prevent you from passing even if you didn't have any of the other codes.

The problem is not that OBD doesn't give a "signal". It is clearly working exactly like it's supposed to. Your problem is "downleg" of the OBD interface and has nothing to do with how OBD is working (which appears to be "working correctly").
Alright I’ll look into thanks you two , very helpful !!
 
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