OBD II port not working?

MSTAN

MEMBER
2007 CHEVROLET MALIBU
2.2L
4 CYL
AUTOMATIC
113,000 MILES

I was driving up a hill and the D started flashing on the dash then on the shifter and my car almost stalled. I came to a stop light and started in low gear because it felt like the motor was going to die, then I put it back in drive. After that the problem seemed to stop. The next day the check engine light came on but there were no more flashes, and the car seemed to be running ok with no flashes or almost stalling. I went to 2 different parts stores to run a scan, but the OBD II port is not able to read any codes with the motor off and also running. Is there a fuse that I could check? My check engine light is still on.

Tuesday, August 29th, 2023 AT 6:41 PM

1 Reply

JACOBANDNICKOLAS

MECHANIC
110,114 POSTS

Hi,

Pin 16 in the data link connector should have battery voltage at all times. See pics 1 and 2 below. I also attached the computer data lines schematics. (pics 3 and 4) I had to cut the pic in half to make it readable.

As far as the power supply is concerned, it comes from a fuse under the dash/body control module. See pic 5 for the fuse location. When you check the fuse, confirm there is power to and from it.

Here is a link you may find helpful:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Also, here is a link you may find helpful as well:

https://www.2carpros.com/articles/comprehensive-guide-troubleshooting-your-automotive-obd2-diagnostic-port

Let me know what you find or if you have questions.

Take care,

joe

See pics below.

Images (Click to make bigger)