How to read DTC codes ?

[thanhhai16]

Hi, i'm new to this field and thanks for amazing library. My car now can connect to your demo app, but i don't know how to read DTC code from my car ?

Can someone give me some example pls

[thdankert]

If you already have a connection to your car, you can get the DTCs by sending the appropriate PIDs and parsing the response.

• LTOBD2PID_PERMANENT_DTC_0A
• LTOBD2PID_PENDING_DTC_07
• LTOBD2PID_STORED_DTC_03

The exact command depends on the kind of DTC you want to read, as there may be some only relevant to a freeze frame, or some are stored permanently due to repeated errors.

Either way, if there are DTC reported, the response will have an array troubleCodes which contains LTOBD2DTC. These have a code and an explanation.

If the explanation is empty, it's probably a manufacturer-defined code: These are usually explained in your car maker's service/workshop manual.

[janessbach]

Is there also the possibility to delete the error codes?

[mickeyl]

Yes, sending LTOBD2PID_CLEAR_STORED_DTC_04 will reset the MIL and erase the stored DTCs.

[mukulpandey57]

Hello @mickeyl , @thdankert
I am getting incorrect DTC in my code using this Library.
From Other App i am getting "P0441","P0442","P0446" and in my app using LTSupportAutomotive i am getting "C0104" "C0204"
Please help it's urgent.

[thdankert]

@mukulpandey57 Is your issue related to this one? The OP asked for general information on using this library to read DTCs - he probably moved on, as this issue has not seen any activity in over a year...

Regarding your question: which DTCs does the other app read, and which ones did you read using this library? There are 3 different PIDs for reading them:

• LTOBD2PID_PERMANENT_DTC_0A
• LTOBD2PID_PENDING_DTC_07
• LTOBD2PID_STORED_DTC_03

[mukulpandey57]

@thdankert , Thanks for your quick response. I was using all three PID ($03, $07,$0A) and only getting the C Codes and other wired scanner and apps getting the P Codes. Please assist.

Seems like something related to this #31

[thdankert]

I'm afraid I am unable to assist you there. I don't know anything about your car, the code you wrote, and how the other applications read DTCs.

[Nikhil-Quadrish]

How to clear the DTC code ? "LTOBD2PID_CLEAR_STORED_DTC_04" any more explanation to this?