How To Reset ABS Light on Peterbilt 389, Peterbilt Truck

How To Reset ABS Light on Peterbilt 389

As a truck driver, I once encountered an issue with the ABS light coming on in my Peterbilt 389. It was frustrating because I knew it could affect the performance of my vehicle. After some research and experimentation, I discovered how to reset the ABS light on my truck.

To reset the ABS light on your Peterbilt 389, first, locate the fuse panel board under the hood on the driver’s side. Find the 25-amp fuse in the L1 position using the diagram on the fuse cooler. If blown, replace the fuse and reinsert it securely. The ABS light should now be reset.

In this article, I’ll share my experience with you. So, if you’re facing a similar issue, read on to learn how to reset the ABS light on your Peterbilt 389 truck. 

How did I Reset ABS light?

Peterbilt 389

It was a typical morning when I woke up and took my Peterbilt 389 truck out for an order. As I turned on the ignition, I noticed that the ABS light was on. I knew that this meant there was a problem with my truck’s anti-lock braking system. But the brakes worked perfectly and I felt no problem.

I am not a mechanic, but I have some knowledge about vehicles. I researched to find a way to reset the ABS light. I tried different methods, but they did not solve the issue. Finally, I was able to find a successful method.

I will walk you through it step-by-step.

Step 1: Find the ABS fuse

First things first, you’ll need to locate your Peterbilt’s fuse panel board. The fuse panel board is located under the hood on the driver’s side of the truck. Once you’ve located the fuse panel board, you’ll need to find the 25-amp fuse in the L1 position. This can be found by referring to the diagram on the fuse cooler.

Step 2: Check the Fuse

The next step is to pull out the fuse and check if it’s blown.

How do you know whether the fuse is good or blown?

Inspect the fuse visually to see if the filament is intact or broken. If the fuse is transparent, you should be able to see the filament through the glass or plastic body of the fuse. My ABS fuse wasn’t transparent. Below, I have mentioned how I tested the fuse using the multimeter.

Step 3: Push the Brake Pedal

Pedals Peterbilt 389

Push and hold the brake pedal for 30 seconds to let the ABS computer be fully drained.

Step 4: Reconnect the Fuse

If old fuse is good reinstall it. You should install a new fuse if the old one has blown. Once you’ve replaced the fuse, reinsert it back into the L1 position. Make sure it’s clipped securely in place.

Step 5: Unclip Fuse Holders

Next, you’ll need to unclip the fuse holders and put them back in place. Make sure they are clipped shut securely. Once you’ve completed these steps, the ABS light on your Peterbilt 389 should be reset.

Watch this short video if you have a problem with the task.

How to Test ABS Fuse by Using a Multimeter

Here is how I checked the fuse.

First, I turned the multimeter to the continuity setting.

Then, I touched the two multimeter terminals together to check for a reading of zero or close to zero.

After, I took the car fuse and touched each of the terminals to the sides of the fuse, with one terminal touching the right side and the other touching the left side.

Next, I held the terminals in place and checked for a reading of zero or close to zero.

If there was a reading of zero or close to zero, the ABS fuse had continuity and was good. The reading was infinity, which means the fuse is blown. So, I replaced the fuse.

It’s important to note that if the ABS light continues to stay on after you’ve reset it, there may be a more serious issue with your truck’s braking system. 

These are the most common causes, and solutions I found in my research for the ABS light coming on in Peterbilt 389.

Low brake fluid levelWorn brake pads or brake system leakRefill brake fluid and check for leaks. Replace worn pads or repair brake system
Wheel speed sensor malfunction Sensor damage or  debris buildupInspect and clean sensors.
Replace damaged sensors
Faulty ABS control moduleElectrical or internal component failureReplace ABS control module
ABS system fuse blownElectrical overload or short circuitCheck and replace blown fuse.
Identify and repair any electrical issues
Brake light switch failureElectrical or mechanical malfunctionInspect and replace brake light switch if needed


What are the signs of a bad ABS module?

  1. The brakes squeal. Any wheel that experiences heavy braking won’t lock up thanks to the ABS.
  2. A non-operational brake pedal
  3. Failure of the speedometer
  4. Increased pedal effort

 Note: ABS module failures are very rare; they work perfectly through the whole vehicle’s lifetime.

Does ABS make me stop faster?

Under all circumstances, ABS adds a significant level of safety when used properly. ABS may shorten stopping distances when applying hard braking pressure, especially on slick and slippery surfaces. It also allows you to maintain vehicle stability and directional control.

What are the main disadvantages of ABS?

Anti-lock braking systems are expensive to build. Therefore, only a select few brands and vehicles can use them. Anti-lock brakes’ main drawback is their inconsistent stopping distance on various terrain types. While the ABS operates flawlessly on muddy terrain.

Due to the presence of electronic components and their sensitivity to the elements, they need to be handled with greater care and should not be exposed to mechanical impacts that could cause system damage.

What are the types of ABS systems?

Different types of anti-lock braking systems exist depending on the number of speed sensors and valves. They are grouped into three categories to simplify things.

  1. Four-Channel four-sensor ABS
  2. Three-channel, three-sensor ABS
  3. One Channel, One Sensor ABS

Anti-lock braking systems with two sensors and one modulator (2S1M) or four sensors and two modulators (4S2M) are typically installed on commercial heavy-duty truck trailers.


In conclusion, resetting the ABS light on a Peterbilt 389 is a simple process that you can do yourself. By following the steps outlined in this article, you can reset the ABS light and ensure that your truck is operating safely on the road. As always, if you have any questions or concerns, don’t hesitate to reach out to your roadside assistance advisor. Thanks for reading, and safe travels!

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