99 Chevy Silverado OBD2 Turns On But Won’t Read

You turn the key in the ignition of your trusty 1999 Chevy Silverado, expecting the familiar hum of the engine. Instead, you’re greeted by silence. A quick glance at the dashboard reveals the dreaded “Check Engine” light staring back at you. You grab your OBD2 scanner, plug it in, and…nothing. The scanner powers on, but it won’t read your Silverado’s computer. Don’t panic—this is a common problem with a range of potential solutions.

1999 Chevy Silverado OBD2 Port Location

Common Reasons Your OBD2 Scanner Won’t Read a 99 Chevy Silverado

Before we dive into troubleshooting, it’s important to understand why your OBD2 scanner might be acting up. Here are the most common culprits:

• Blown OBD2 Fuse: The OBD2 port in your Silverado is connected to the vehicle’s electrical system through a fuse. If this fuse blows, the scanner won’t receive power and therefore can’t communicate with the car’s computer.
• Faulty OBD2 Port: Over time, the OBD2 port itself can become damaged or worn out. This is especially true if you frequently plug and unplug your scanner or other devices.
• Wiring Issues: The wiring harness connecting the OBD2 port to the Silverado’s computer can become loose, corroded, or damaged, disrupting the flow of information.
• Dead Vehicle Battery: While the scanner might power on, a weak or dead battery can prevent the Silverado’s computer from properly communicating.
• Incompatible Scanner: Not all OBD2 scanners are created equal. Some scanners might not be compatible with older vehicles like your 1999 Silverado.

Troubleshooting a 99 Chevy Silverado OBD2 Connection

Now that you know the potential causes, let’s explore how to get your OBD2 scanner up and running:

1. Check the OBD2 Fuse

• Locate the fuse box for your 1999 Silverado, typically under the dashboard or in the engine bay.
• Consult your owner’s manual to identify the correct fuse for the OBD2 port.
• Inspect the fuse for any signs of damage, such as a broken wire or a blackened metal strip.
• If the fuse is blown, replace it with a new one of the same amperage.

2. Inspect the OBD2 Port

• Look inside the OBD2 port for any bent or broken pins.
• Check for dirt, debris, or corrosion that could interfere with the connection.
• Use compressed air or a cotton swab dipped in rubbing alcohol to gently clean the port.

3. Test the Vehicle Battery

• Use a multimeter to test your Silverado’s battery voltage.
• A fully charged battery should read around 12.6 volts.
• If the voltage is low, charge or replace the battery as needed.

4. Verify Scanner Compatibility

• Consult your OBD2 scanner’s documentation to ensure it’s compatible with 1999 model year vehicles.
• If possible, try using a different OBD2 scanner known to work with older cars.

Mechanic Checking OBD2 Scanner Compatibility with 1999 Chevy Silverado

5. Inspect the Wiring (Advanced)

• Caution: Inspecting the wiring harness requires more advanced automotive knowledge. If you’re not comfortable working with electrical components, it’s best to consult a qualified mechanic.
• If you choose to proceed, disconnect the negative battery terminal before working on any wiring.
• Trace the wiring harness from the OBD2 port towards the Silverado’s computer, looking for any loose connections, damaged insulation, or signs of corrosion.
• Repair or replace any damaged wiring as needed.

What if the OBD2 Scanner Still Won’t Connect?

If you’ve followed these troubleshooting steps and your OBD2 scanner still won’t read your 1999 Chevy Silverado, there might be a more complex electrical issue. In these cases, it’s highly recommended to seek professional help from a qualified mechanic who can diagnose and repair the problem.

FAQs: 99 Chevy Silverado OBD2 Issues

Q: Where is the OBD2 port located on a 1999 Chevy Silverado?

A: The OBD2 port is typically located under the dashboard on the driver’s side, near the steering column.

Q: Can I drive my 1999 Chevy Silverado with a blown OBD2 fuse?

A: Yes, you can usually drive with a blown OBD2 fuse. However, it’s important to replace the fuse as soon as possible, as a blown fuse might indicate an underlying electrical issue.

Q: Do I need a special OBD2 scanner for a 1999 Chevy Silverado?

A: While most standard OBD2 scanners will work, it’s a good idea to verify compatibility with 1999 model year vehicles. Some older vehicles might require scanners with specific protocols.

Need More Help?

Still having trouble getting your OBD2 scanner to communicate with your 1999 Chevy Silverado? Don’t hesitate to reach out to our team of automotive experts for personalized assistance. Contact us via WhatsApp at +1(641)206-8880 or email us at [email protected]. We’re available 24/7 to help you get back on the road.