If your OBD2 scanner plugs into the Ford Transit Connect and shows no lights or fails to connect, the most common cause is a blown fuse for the data link connector. This is a 2-minute fix that costs under £2.
The OBD port on the Transit Connect is powered by a 10 amp micro fuse in position 19 in the passenger compartment fuse box.
When You Need This Job
- OBD2 scanner shows no lights when plugged in
- Scanner fails to connect to the vehicle ECU
- Diagnostic tool not communicating
- OBD port has no power
DIY vs Garage Cost — UK 2026
A garage will typically charge a "no-communications" diagnostic fee of £60-£120 simply to identify that the OBD port is blown — before they have even fixed anything. That's because most garages charge a minimum hour of labour to plug their tool in, find that nothing responds, then trace the power and ground at the port back to the fuse box. The actual fix once they find it is replacing a fuse: parts cost around £1, labour around 5 minutes. DIY cost: a 10-piece blade-fuse kit from a UK factor is £3-£6, a multimeter to confirm the fault is £15-£30 if you don't already own one. Total parts: under £10. This is one of those jobs where the diagnostic step is the entire job — once you've found it, the fix is trivial. Worth knowing: the OBD port fuse on a Transit Connect is sometimes shared with the cigar lighter and the dashcam socket. If either of those has stopped working alongside the dead OBD port, you have your answer.
Tools You'll Need
Step-by-Step Guide
Plug in your OBD scanner to confirm no power
Connect your OBD2 scanner to the port under the dashboard. No lights on the scanner means no power to the port.
Locate the fuse diagram in the handbook
The Transit Connect comes with a handbook that lists fuse positions. Look for "data link connector" — it is a 10 amp fuse in position 19 in the passenger compartment fuse box.
Access the passenger compartment fuse box
Open the passenger side glove box and press both tabs on either side to drop the glove box down fully. The fuse box is now visible inside the dashboard.
Find fuse 19 — third row in, third one up
Using the fuse diagram as reference, locate fuse 19. Count to the third row across and the third fuse up from the bottom.
Pull out the fuse and inspect it
Use a fuse puller or flat blade screwdriver to remove fuse 19. Hold it up to the light — a blown fuse will have a visibly broken wire inside.
Replace with a new 10 amp micro fuse
Fit a new 10 amp micro fuse in the same position. You should hear a beep from the vehicle when it seats — this confirms the data link connector has power.
Test with the OBD scanner
Plug the scanner back in. It should now light up and connect to the ECU. Turn the ignition on and run a scan to read any stored fault codes.
Once the OBD port is working run a full system scan. The original cause of the blown fuse may have stored fault codes worth investigating.
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