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OBD-II has power, but the code reader cannot pull codes?

Tiny
JLPOPPE
  • MEMBER
  • 2012 FORD FUSION
  • 6 CYL
  • 2WD
  • AUTOMATIC
  • 150,000 MILES
The Check Engine light is on in my son's car listed above. I have connected the code reader to the OBD-II port, and it has power, but no codes populate on the reader.

The error says "Communication Error. Unable to establish communication. Verify the connection at the DLC and that the ignition is in the ON position. Press to re-link".

The code reader works on all other vehicles we have, so that is not it. Do we need to replace the OBD-II port, check fuses, etc? If replacing the port is necessary, how do I go about that?
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Monday, July 1st, 2024 AT 5:45 AM

3 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 46,047 POSTS
Yep, let's check the fuses to see if any are blown, with the key/system on check for power at the fuse #f20 in the fuse panel by the left side of the dash. This guide will help:

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

Here is the fuse location so you can check it out. Check out the images (below). Please let us know what happens.
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Monday, July 1st, 2024 AT 11:30 AM
Tiny
JLPOPPE
  • MEMBER
  • 2 POSTS
No fuses are blown. Checked with Voltimeter. Reset the ECM as well. Still will not communicate.
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Monday, July 1st, 2024 AT 11:38 AM
Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 46,047 POSTS
Is there voltage at the fuse? You may have a smart junction box that has gone out.
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Monday, July 1st, 2024 AT 11:42 AM

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