2021 Peterbilt 389 2021 Base Straight Truck – Long Conventional

Common Issues

The 2021 Peterbilt 389 has reported issues with fuel efficiency and electronic components, particularly in the engine management system. Regular diagnostics can help identify and mitigate these problems early.

Maintenance Tips

Regular maintenance of the 2021 Peterbilt 389 should include oil changes every 10,000 to 15,000 miles, checking the air filter every 20,000 miles, and inspecting the brakes and tire conditions frequently. Keep an eye on the coolant levels and transmission fluid as well.

Typical Repair/Owership Cost Ranges

Annual maintenance costs for a Peterbilt 389 typically range from $3,000 to $5,000, depending on usage and repair needs. Major repairs, such as engine overhauls, can range from $10,000 to $30,000.

Buying Advice (What to Inspect)

When inspecting a used 2021 Peterbilt 389, check for any signs of wear on tires and brakes, inspect the engine for leaks, and ensure that all electrical systems are functioning properly. Reviewing maintenance records can also provide insight into how well the truck has been cared for.

FAQ

What fuel economy can I expect from the 2021 Peterbilt 389? Fuel economy can vary but typically ranges from 6 to 8 miles per gallon, depending on load and driving conditions.

How often should I service my 2021 Peterbilt 389? It's recommended to perform service every 10,000 to 15,000 miles or as outlined in the owner's manual.

What type of oil should I use for my 12.9L engine? Use high-quality synthetic diesel engine oil that meets the API standards recommended for heavy-duty diesel engines.

Are there aftermarket parts available for this model? Yes, there are numerous aftermarket parts available, often at a lower cost than OEM parts.

How do I improve fuel efficiency in my Peterbilt 389? Regular maintenance, proper tire inflation, and reducing unnecessary weight can help improve fuel efficiency.

What is the warranty like for a new Peterbilt 389? New Peterbilt trucks typically come with a warranty of 3 years or 300,000 miles, whichever comes first.

Can I modify my Peterbilt 389 for better performance? Yes, performance modifications are possible; however, they should be done carefully to avoid voiding warranties.

Is financing available for purchasing a Peterbilt 389? Yes, many dealerships offer financing options; it's advisable to shop around for the best rates.