A malfunctioning OBDII port can prevent diagnostic tools from communicating with your vehicle’s computer, making troubleshooting difficult. If you’re having trouble connecting a scanner to your 2014 Chevy Express 2500, a blown OBDII fuse might be the culprit. This guide will help you locate and check the fuse responsible for your OBDII port.
Pinpointing the OBDII Fuse
The OBDII port on a 2014 Chevy Express 2500 is typically powered by the same fuse that powers the cigarette lighter or accessory power outlet. This fuse is often labeled as “CIG LTR” or “ACC” on the fuse box cover.
There are two fuse boxes in the 2014 Chevy Express 2500:
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Underhood Fuse Block: Located in the engine compartment, usually near the battery. This fuse block often houses high-amperage fuses for major components. Consult your owner’s manual for the exact location and layout. You may need to remove a cover to access the fuses.
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Instrument Panel Fuse Block: Located inside the vehicle, usually under the dashboard on the driver’s side or passenger side. This fuse block typically contains lower-amperage fuses for interior components and accessories. This is where you’ll likely find the OBDII fuse.
Checking the Fuse
Once you’ve located the correct fuse box, use the diagram on the fuse box cover to identify the “CIG LTR” or “ACC” fuse.
Carefully remove the fuse using a fuse puller (often found attached to the inside of the fuse box cover). Inspect the fuse visually. A blown fuse will have a broken filament or a darkened glass section.
Replacing the Fuse
If the fuse is blown, replace it with a new fuse of the same amperage rating. The amperage rating is printed on the top of the fuse. Using a fuse with a different amperage can damage the electrical system.
After replacing the fuse, try connecting your diagnostic scanner again. If it still doesn’t connect, there might be another issue with the OBDII system or the scanner itself.
If you’re unsure about any part of this process, consult your vehicle’s owner’s manual or seek assistance from a qualified mechanic. Locating and replacing the correct fuse can help you get back on the road quickly and safely.
