After the check engine light appearing on my car, I tried to connect the obd 2 diagnostic scan tool, only to show errors instead of showing the trouble codes. This issue prompted me to research online and ask different technicians that what the issue might be. A good number of motorists encounter this problem and usually don’t know why it occurs.

But after conducting research online and speaking to different mechanics and technicians, I found out that a wide range of problems can cause it. These issues include an incompatible obd2 scan tool, bad fuses, damage in the circuit board, ECU, and failed computer.

In most cases, these issues can be rectified and amended to allow you to read the error codes. First and foremost, you should inspect whether the code reader is compatible with your vehicle or not. Test it with another car and see if it functions, if it doesn’t, then probably, the issue is not with the scan tool. Afterward try checking the fuses and see if they are working fine. If there is a bad fuse, you will continue receiving the error when you link the obd2 to the computer. Get it replaced so that you can detect the error codes and allow them to be displayed.

In addition, one of the computers might be the problem. But identifying this is very difficult as a result of the data transferred between the two controllers. So, you will need to check the main ECU. Another way of identifying what the cause or the no linking could be is by testing pin to pin check with a wiring schematic while utilizing a voltmeter to inspect every single wire. If you are not able to find out what the issue is, you can visit a mechanic to figure out and correct any errors.

Kevin Nicholas is an automotive technician who is a genius at software and hardware-related issues. He manually tested more than a hundred OBD scanners and gave his honest opinion on whether the device was worth the money or not. His in-depth OBD review articles help people choose the right product, whether it is a European, American, or Asian vehicle. He completed his Automotive Specialized Training Course at Universal Technical Institute and has more than 15 years of experience in the field.

4 Responses

  1. I’m having an issue where my car won’t start and in RUN position there is no power to 15A Transmission Position Switch fuse nor getting power to the 5A GEM Park Neutral Switch fuse on the fusebox. All fuses are good. OBD II scanner I got from Walmart won’t connect, nor does the Bluetooth OBD II scanner that previously worked with the car. Any ideas??

  2. My problem is, when i connect the obdII reader, instead of activate, the screen start binking, and obviously nothing can be read.
    I try with another reader with the same result.
    I tested pin 16 and reads 12 v, also tested pin 4, end there is a good grounding. I didnt test the other pins because i dont know what is suposed to read there.
    Any suggestions??
    My Car: Chevrolet TrailBlazer, 2006 motor 6L

  3. the vin or pid support recieved from the vehicle changed during the odb test

    on a chevy hhr 2006. Do you know what has to be repaired? thank you for any info.

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