Peterbilt Windshield Washer Pump Not Working

If your Peterbilt windshield washer pump is not working, it may be due to a faulty pump motor or a clogged nozzle. Check the pump motor and replace it if necessary, and clean or unclog the nozzle to restore proper functionality.

Common Issues With Peterbilt Windshield Washer Pump

Here is an overview of some common problems you may encounter with your Peterbilt windshield washer pump

  • No fluid coming out: One of the most common issues is when no fluid comes out when you activate the washer pump. This could be due to a clogged nozzle, a faulty pump, or a lack of washer fluid.

  • Intermittent operation: Sometimes, the washer pump may only work sporadically. This could be caused by loose electrical connections, a malfunctioning switch, or a worn-out pump motor.

  • Weaker spray: Another problem could be when the washer pump sprays a weak stream of fluid. This may indicate a restricted fluid supply or a worn-out pump impeller.

  • Strange noises: If you hear unusual sounds, such as grinding or whining, when operating the washer pump, it may be a sign of a damaged pump motor or a worn-out impeller.

  • Leaking washer fluid: Leaks can occur due to damaged hoses, loose fittings, or a defective pump. This can result in a loss of fluid and reduced washer performance.

If you are experiencing any of these issues, it’s important to have your Peterbilt windshield washer pump inspected and repaired by a qualified technician.

Diagnosing Peterbilt Windshield Washer Pump Issue

When your Peterbilt’s windshield washer pump stops working, it can be frustrating and potentially unsafe. However, before taking it to a mechanic, there are a few steps you can take to diagnose the problem yourself.

Checking For Power Supply Issues

The first step is to check the power supply to the windshield washer pump. Start by locating the pump, which is usually found near the windshield washer reservoir.

Use a multimeter to test if the pump is receiving power. If not, the issue may be with a blown fuse or a faulty wiring connection. Check the fuse box and inspect the wires to see if there are any visible signs of damage.

Checking For Blockage Or Clog In The Pump

If the power supply is not the problem, the next step is to check for any blockage or clog in the pump. Remove the pump from the reservoir and visually inspect it for any debris or blockage.

Clean the pump using a mild detergent and water solution, and test it again to see if it is working properly.

If these steps do not solve the issue, it is recommended to seek professional assistance to further diagnose and fix the problem with your Peterbilt’s windshield washer pump.

Fixing Peterbilt Windshield Washer Pump

If you’re experiencing issues with your Peterbilt windshield washer pump, it’s important to address the problem promptly to ensure clear visibility while driving. One common solution is to replace the windshield washer pump altogether.

Replacement Of The Windshield Washer Pump

To replace the windshield washer pump in your Peterbilt, follow these steps:

  • Start by locating the existing pump, usually positioned near the washer fluid reservoir.
  • Disconnect the electrical connector and any attached hoses.
  • Remove the pump from its mounting bracket.
  • Install the new pump into the mounting bracket.
  • Reattach the electrical connector and hoses.

Tips For Maintaining The Pump

To ensure the longevity of your Peterbilt windshield washer pump and prevent future problems, consider the following maintenance tips:

  • Inspect the hoses for any signs of damage or blockages.
  • Use a washer fluid that is designed for cold weather to prevent freezing in colder climates.
  • Periodically clean the nozzles to remove any buildup that may obstruct the spray.

Troubleshooting Peterbilt Windshield Washer Pump

Addressing issues with no spray or weak spray

  • Check the windshield washer fluid level. If it’s low, refill it and test the pump.
  • Inspect the hoses and nozzles for any clogs or obstructions. Clean or replace them as necessary.
  • Examine the pump motor for any signs of damage or failure. If it’s faulty, replace it.

Dealing with intermittent operation

  • Check the wiring connections to ensure they are secure and free from corrosion.
  • Test the washer pump switch for any issues. Replace it if needed.
  • Inspect the washer pump relay for any damage. If necessary, replace it with a new one.

Tips For avoiding future problems

  • Regularly clean the windshield and remove debris to prevent clogs.
  • Use a high-quality windshield washer fluid to ensure proper operation.
  • Inspect the washer system components periodically for any signs of wear or damage.
  • Address any issues promptly to avoid further damage to the windshield washer system.

Resources And Support For Peterbilt Windshield Washer Pump Repair

When your Peterbilt windshield washer pump stops working, finding the right resources and support for repair is essential.

Online forums and communities dedicated to Peterbilt trucks can be valuable sources of information and assistance.

Connecting with fellow truck owners who have experienced similar issues can provide advice and troubleshooting tips.

Another option is to reach out to local Peterbilt service centers. These professionals have the expertise and knowledge to diagnose and repair the problem with your windshield washer pump.

They can also assist in finding the right replacement parts to ensure that your pump is functioning properly.

FAQ For Peterbilt Windshield Washer Pump Not Working

What Causes Windshield Washer Pump To Stop Working?

The windshield washer pump may stop working due to a faulty motor, clogged nozzles, a blown fuse, or a broken or disconnected hose.

Does A Washer Pump Have A Fuse?

Yes, a washer pump has a fuse.

Why Is My Peterbilt Windshield Washer Pump Not Working?

There could be several reasons why your Peterbilt windshield washer pump is not working. It could be due to a blown fuse, a faulty pump motor, a clogged or damaged nozzle, or low or no washer fluid.

Check these components to determine the exact cause and take appropriate action. Regular maintenance can also prevent future issues.

How Do I Troubleshoot A Peterbilt Windshield Washer Pump?

To troubleshoot a Peterbilt windshield washer pump, start by checking the fuse and replacing it if necessary. Ensure that there is enough washer fluid and that the reservoir is not empty or leaking.

Inspect the pump motor and the nozzle for any obstructions or damage. If the issue persists, consult a professional mechanic for further assistance.


To sum up, troubleshooting a Peterbilt windshield washer pump is a task that requires patience and attention to detail.

By following the steps outlined in this blog post, you can identify and resolve common issues that may be preventing your pump from working.

Remember to check the fuse, examine the wiring, test the pump, and inspect the washer fluid reservoir. Taking these steps will ensure a clear and functioning windshield washer system in your Peterbilt truck.

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