RoadVitals

2020 Peterbilt 520

Recalls, owner-reported complaints, investigations and safety data

Data refreshed

Owner complaintsComplaints are reports submitted to NHTSA by owners and drivers. NHTSA does not verify most reports before publishing them, and a complaint does not establish that a defect exists. Volume is influenced by how many of a vehicle were sold, how long it has been on the road, and how much attention an issue has received.
3
Latest Aug 2, 2021
Safety recallsA safety recall is issued when a manufacturer or NHTSA determines that a vehicle has a safety-related defect or does not comply with a federal motor vehicle safety standard. Recall repairs are free. Whether a specific vehicle is covered depends on its VIN — a recall listed for a model year does not necessarily apply to every vehicle of that year.
12
Latest Dec 16, 2022
InvestigationsNHTSA opens an investigation to examine whether a safety defect may exist. An open investigation is not a determination that a defect exists, and many investigations close without a recall. Investigations can, however, lead to one.
0
Crash or fire reportedComplaints whose submitter recorded that a crash or a fire occurred. These are the reporter's own answers on the NHTSA form, not verified findings.
0

Overview

Our database contains 3 NHTSA owner-reported complaints for the 2020 Peterbilt 520, most frequently naming the brakes category. 12 safety recalls have been issued covering this model year; and 49 manufacturer communications are on file.

Complaints are reports submitted by owners and drivers to NHTSA. They are not verified and do not establish that a defect exists.

What owners report

Complaints grouped by the component NHTSA recorded

  • Brakes3100.0%

Percentages are of component mentions. A single complaint can name more than one component, so these do not sum to the total complaint count.

Safety recalls

12 campaigns cover this model year

View all 12

Recalls apply to specific vehicles, not to every vehicle of a model year. Check your VIN with NHTSA or your manufacturer's dealer to confirm whether a recall affects your vehicle.

Check a VIN on NHTSA.gov
22V939000

SUSPENSION:MULTIPLE AXLE

Dec 16, 2022
15,658 units potentially affected
The defect: PACCAR Incorporated (PACCAR) is recalling certain 2015-2023 Peterbilt 320 and 520 refuse trucks equipped with Haulmaax/EX suspensions. The suspension tracking rod brackets may fail and detach from the forward drive axle, causing the axle to become unstable.
The risk: An unstable axle can decrease vehicle stability and control, increasing the risk of a crash.
The remedy: Dealers will inspect the welds and add an additional bracket between the tracking rod bracket and axle housing, as necessary, free of charge. Owner notification letters are expected to be mailed February 14, 2023. Owners may contact Peterbilt's customer service at 1-940-591-4220. PACCAR's number for this recall is 22PBL.
PACCAR IncorporatedManufacturer number 22PBLView on NHTSA.gov
22V277000

STEERING:CRITICAL FASTENERS

Apr 25, 2022
17,641 units potentially affected
The defect: PACCAR Incorporated (PACCAR) is recalling certain 2018-2020 Kenworth T270, T370, T440, T470, T660, T680, T880, T800, W900, W990; and 2018-2020 Peterbilt 330, 337, 348, 365, 367, 389, 520, 567, and 579 vehicles. The Dana D-Series axle steer arm fasteners that attach the steering arm to the steering knuckle may fail.
The risk: Fastener failure can result in a loss of steering control, increasing the risk of a crash or injury.
The remedy: Dealers will replace and torque the steer arm fasteners, at no charge. Owner notification letters were mailed November 8, 2022. Owners may contact Kenworth customer service at 1-425-828-5888 and Peterbilt customer service at 1-940-591-4220. PACCAR's numbers for this recall are 22 PBB and 22 KWB.
PACCAR IncorporatedManufacturer number 22 PBB and 22 KWBView on NHTSA.gov
21V720000

SERVICE BRAKES, AIR

Sep 16, 2021
15 units potentially affected
The defect: PACCAR Incorporated (PACCAR) is recalling certain 2020-2021 Peterbilt 520 vehicles. The quick release valve on the rear brake signal hose may be missing. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard number 121, "Air Brake Systems."
The risk: A missing quick release valve cannot ensure correct rear brake release timing, increasing the risk of a crash or injury.
The remedy: Dealers will inspect the vehicles for a missing quick release valve, and install one if necessary, free of charge. Owner notification letters were mailed on October 7, 2021. Owners may contact PACCAR's customer service at 1-940-591-4220 (Peterbilt). PACCAR's number for this recall is 21PBK.
PACCAR IncorporatedManufacturer number 21PBKView on NHTSA.gov

Recent owner complaints

Reports submitted to NHTSA, shown in the owner's own words

Brakes
Filed Aug 2, 2021

This one was taken in after the first one also for inspection by dealer. Issue wasn't as severe due to lower mileage and use. I believe the pads were just changed as a precaution, I don't believe they had started to separate.

NHTSA ID
11427424
Incident
May 13, 2021
Brakes
Filed Aug 2, 2021

After issue with first truck dealership asked to bring in others to be inspected and found same issue with them. Front brake pads were separating from backing. This truck had less mileage so damage not as severe.

NHTSA ID
11427422
Incident
Apr 12, 2021
Brakes
Filed Aug 2, 2021

Truck was brought in because driver heard a grinding noise. Mechanic inspected and found that the front disc brake pads and separated from the backing. Truck was thought to still be under warranty and was then taken to dealership for repairs.

NHTSA ID
11427420
Incident
May 6, 2021

Manufacturer communications

A bulletin sent by a manufacturer to its dealers. Not a recall, and repairs are not necessarily free.

43-088

ENGINE

This optional software update is now available for chassis equipped with EMY 2021B-2023 PACCAR MX-11 and MX-13 engines. This update provides customers with additional time to service their trucks before a DEF-related derate occurs. The software is being offered to customers in alignment with recently updated regulatory agency guidance.

43-088

ENGINE

"The software is not yet available. The bulletin will be updated when more information is available."

43-088

ENGINE

"An optional software update will be available on 07/06/2026 for chassis equipped with EMY 2021B-2023PACCAR MX-11 and MX-13 engines. This update provides customers with additional time to service theirtrucks before a DEF-related derate occurs. The software is being offered to customers in alignment withrecently updated regulatory agency guidance."

E326

ELECTRICAL SYSTEM; ENGINE

EPA17-24 MX Fuel Injector Connector - This bulletin has been revised to include all EPA17-24 and CARB24 PACCAR MX engines.

98-030

ELECTRICAL SYSTEM

5/29/2025: A new Ethernet Multiplexed Architecture (EMUX) Service Tool Kit service manual (SM034-022) has been released to provide general use information. The new EMUX Service Tool Kit improves cab & chassis electrical troubleshooting efficiency, while reducing risk of component damage. 4/29/2025: The Ethernet Multiplexed Architecture (EMUX) Service Tool Kit and individual kit components are now available to order. Dealers that have received their first kit may order an additional kit. The EMUX Service Tool Kit Part number has been updated to match OEM drawings (P74-1045-001). Individual kit component part numbers can be found in the Reference Bill of Materials sheet. The new EMUX Service Tool Kit improves cab & chassis electrical troubleshooting efficiency, while reducing risk of component damage. Information Only New diagnostic tool is required to support PACCAR Ethernet Multiplexed Architecture (EMUX). The EMUX Service Tool Kit will help improve cab & chassis electrical troubleshooting efficiency, while reducing the risk of component damage.

46-016

ELECTRICAL SYSTEM

4/29/2025: Campaign A software update is available for 520EV and 579EV Battery Electric Vehicles. This software update corrects or improves certain functions. Software update procedures have been revised. Campaign start date is 12/05/2024. Campaign A software update is available for 520EV and 579EV Battery Electric Vehicles. This software update corrects or improves certain functions. Campaign start date is 12/05/2024.

Manufacturers file copies of the bulletins they send to dealers with NHTSA. These often describe diagnostic or repair procedures for a known condition. They are not recalls: repairs described in a bulletin are usually only free if the vehicle is still under warranty or the manufacturer has extended coverage.

Compare model years

Complaint and recall counts across every year of this model

Peterbilt 520 by model year
YearComplaintsRecallsInvestigationsIssue Index
2026020—
2025070—
2024080—
2023050—
2022040—
2021060—
2020Viewing3120—
2019181—
2018081—
2017051—
2016040—
2015030—
2014010—
2013010—
2012010—
2011010—
2010010—
2009010—
2008010—
2007010—
2006010—
2005010—
2004010—
2003010—
2002010—
2001010—
2000010—
1999010—
1998010—
1997010—
1996010—
1995010—
1994010—
1993010—
1992010—
1991010—
1990010—

Higher-selling and older vehicles accumulate more reports. Counts are not failure rates and are not directly comparable between vehicles that sold in very different numbers. Older model years have had longer for reports to accumulate.