Skip to content
Peterbilt 579Model year report

2020 Peterbilt 579 Problems

Complaints
5filed with NHTSA
Median mileage
264,786miles, 2 complaints with mileage
Recalls
6campaigns on record
Trend
Not enough dataFewer than 15 complaints, too few for a reliable trend.

Sources: NHTSA records for the 2020 Peterbilt 579 (complaints, recalls, investigations). Report an error

NHTSA recorded 5 consumer complaints for the 2020 Peterbilt 579. The part named most often is electrical system, with 2 complaints (40% of the total), followed by transmission and drivetrain (2) and brakes (1). 2 of the complaints include a mileage, and 0% of those were filed for vehicles with under 50,000 miles; the median is 264,786 miles. NHTSA lists 6 recall campaigns and 104 technical service bulletins for this model year. Electrical system complaints overlap with 3 recall campaigns covering the cables and 29 technical service bulletins filed under the same part. Transmission and drivetrain complaints overlap with 13 technical service bulletins filed under the same part.

This model year has fewer than 25 complaints on record, so the numbers below can change a lot with a few new reports.

Which parts are reported most

Complaints can name more than one part, so the counts add up to more than the total. Select a part to see its complaints, recalls and bulletins.

Example complaints

Electrical system: “Odometer Fraud. The contact purchased a 2020 Peterbilt 579. The contact stated that while attempting to register the vehicle, it was discovered that there was a mileage discrepancy. The vehicle was a dealer sale. At the time of purchase, the vehicle mileage was 217,000, and at the time of registration, it was discovered that the mileage was 349,571.”

NHTSA complaint #11688101, filed 2025-09, 349,571 miles

Transmission and drivetrain: “Camshaft failure as described in previous service bulletins for same year, make, model truck and Paccar MX-17 engine. Available for inspection as truck is not operational. Vehicle has been inspected by mechanic and no warning, messages, or other symptoms prior to the failure being noticed and inspected to locate issue.”

NHTSA complaint #11730456, filed 2026-04

Brakes: “Vehicle has a following distance sensor on front bumper. Sensor is sensing overpasses when traveling underneath them and that should not be detected. Vehicle is automatically applying hard braking. This is causing a possible rear end collision and or loss of vehicle controll in wet conditions.”

NHTSA complaint #11560967, filed 2023-12

Electronic stability control: “Eoa support bracket broke off and the eoa manifold fell into the drive shaft causing the loss of air pressure. The truck was on the instate in the city.”

NHTSA complaint #11360473, filed 2020-09, 180,000 miles

Mileage when problems were reported

0% of the 2 complaints with a mileage were filed for vehicles with under 50,000 miles; the middle half falls between 180,000 and 349,571 miles.

0%0–100%10–250%25–500%50–750%75–1000%100–150100%150+
Share of complaints by mileage when the problem was reported, in thousands of miles (2 complaints with mileage). Red bars: under 50,000 miles. Bucket widths differ. Median: 264,786 miles.

Complaints by year filed

Fewer than 15 complaints, too few for a reliable trend.

20202023202520262
Complaints by year the complaint was filed with NHTSA. Red bars: the last 3 full calendar years used for the trend. The current year (2026) is partial.

Recalls and investigations

Recall details for the 2020 Peterbilt 579 → · Check a VIN at nhtsa.gov/recalls

Technical service bulletins

TSBs are manufacturer notes to dealers about known repair procedures. They are not recalls and do not by themselves mean a vehicle has a fault. 104 on record; the latest 10 are shown.

See all 104 bulletins →

Other model years of the Peterbilt 579

YearComplaintsMedian miRecallsCrash ★MPGScore (50 = typical)Trend
20227220,53615———Not enough data
20205264,7866———Not enough data
2018736,37514———Not enough data

All Peterbilt 579 model years

Frequently asked questions

How many NHTSA complaints does the 2020 Peterbilt 579 have?

NHTSA recorded 5 consumer complaints for the 2020 Peterbilt 579 as of Oct 27, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.

What part of the 2020 Peterbilt 579 is reported most often?

Electrical system is named most often, in 2 complaints (40% of the total), followed by transmission and drivetrain with 2.

Has the 2020 Peterbilt 579 been recalled?

NHTSA lists 6 recall campaigns for this model year. To check a specific vehicle, enter its VIN at nhtsa.gov/recalls.

At what mileage are problems with the 2020 Peterbilt 579 reported?

Among the 2 complaints that include a mileage, the median is 264,786 miles and the middle half falls between 180,000 and 349,571 miles; 0% were filed for vehicles with under 50,000 miles.

About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 27, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.

Complaint counts come from NHTSA’s public complaint database; we count each complaint once. The source records for this vehicle are on nhtsa.gov. Scores and trends are our own summaries of that data, described in the methodology. This page is not legal, safety or repair advice: for a specific vehicle, check its VIN at nhtsa.gov/recalls and ask a qualified mechanic. See an error? Tell us.