2021 Peterbilt 377 Overview, Reviews, Ratings & Specs

The Good

The 2021 Peterbilt 377 offers formidable performance and legendary reliability, appealing to practicality. Its iconic, classic design evokes pride of ownership, while a comfortable, driver-centric cabin enhances long-haul productivity, satisfying both emotional and practical desires.

The Bad

Potential weaknesses for the 2021 Peterbilt 377 may include its inherently higher purchase price compared to some competitors. Older designs might also mean less advanced infotainment systems and driver-assistance tech as standard compared to the latest models from other manufacturers.

2021 Peterbilt 377: Quick Overview

• Engine Options: The 2021 Peterbilt 377 is typically equipped with robust PACCAR MX-13 engines or Cummins ISX15 engines, renowned for their power and durability in heavy-duty applications. Specific engine variants will depend on the truck's configuration and vocational purpose.
• Horsepower: Horsepower ratings for these engines generally range from 400 hp up to 600 hp, with torque figures often exceeding 1,450 lb-ft, providing ample power for demanding hauling and construction tasks.
• Fuel Economy: Fuel economy for heavy-duty trucks like the 377 is highly variable, depending on engine choice, gearing, load, driving style, and terrain. Expect figures typically in the range of 5-7 miles per gallon (MPG) under optimal conditions.
• 0-60 Times: 0-60 mph times are not a primary metric for vocational trucks and are heavily influenced by weight, load, and gearing. For an empty truck, acceleration would be moderate but not comparable to lighter vehicles.
• Towing Capacity: Towing capacity is a critical aspect and is designed for heavy-duty operations. Depending on the chassis configuration, axle setup, and fifth-wheel rating, the 377 can be configured to tow gross combination weights (GCW) well over 100,000 pounds, suitable for heavy haulage, specialized trailers, and vocational equipment.
• Trim-Level Features: Peterbilt trucks are highly customizable, and the 377 is no exception. Key features often include robust frame rails for durability, various axle configurations (single, tandem, tridem), robust suspension systems (leaf spring, air ride), and a wide range of transmission options (manual, automatic, automated manual). Interior trims focus on driver comfort and functionality, with options for premium materials, ergonomic seating, advanced climate control, and integrated diagnostics. Exterior features often include powerful lighting, chrome accents, and specialized body upfits tailored to specific industries like construction, vocational services, or long-haul trucking.

2021 Peterbilt 377 Specifications

Vehicle History Report

What Problems Does the 2021 Peterbilt 377 Have?

As a vocational truck, the 2021 Peterbilt 377 is built for demanding work, and its reliability is generally high when properly maintained. However, like any complex heavy-duty vehicle, specific issues can arise over time and mileage. Common areas that owners might monitor include the PACCAR MX-13 engine, which, while robust, can be susceptible to issues like DEF (Diesel Exhaust Fluid) system malfunctions, EGR (Exhaust Gas Recirculation) valve problems, or DPF (Diesel Particulate Filter) regeneration issues, especially if the truck experiences a lot of short-haul or stop-and-go driving that prevents proper exhaust system heating. Electrical gremlins can also be a concern in any vehicle with extensive wiring harnesses, potentially leading to intermittent sensor failures or dash warning lights. Cab and chassis wear and tear are also factors, particularly in severe duty applications such as construction or off-road use, where suspension components, bushings, and chassis integrity require regular inspection and maintenance. Transmission issues, though less frequent with reputable brands like Eaton or Allison, can occur with heavy use or improper operation. Regarding recalls for the 2021 model year, it's crucial for owners to consult the NHTSA (National Highway Traffic Safety Administration) database using the vehicle's VIN for any specific safety recalls that may have been issued. General long-term reliability for Peterbilt trucks is excellent, with many units serving for hundreds of thousands, if not millions, of miles. However, the longevity and freedom from significant issues are heavily dependent on adhering to a strict preventative maintenance schedule, using high-quality fluids and parts, and employing experienced diesel technicians for servicing.

How long will the 2021 Peterbilt 377 last?

The 2021 Peterbilt 377 is engineered for longevity, with many units expected to serve for over 1,000,000 miles when subjected to diligent maintenance. Average mileage can vary dramatically, from 40,000-60,000 miles per year for long-haul operations to potentially higher figures for vocational uses with extensive uptime. Long-term durability is a hallmark of Peterbilt, with robust chassis, reliable powertrains, and a focus on build quality. Weaknesses that might emerge over time typically relate to wear-and-tear components, such as suspension parts, brake systems, and exhaust after-treatment systems, especially in harsh environments or with irregular maintenance. However, the core structure and drivetrain are known to withstand significant abuse and mileage, making them a sound investment for extended service life.

What Technology & Safety Features are Included?

The 2021 Peterbilt 377, while rooted in a classic design, offers a range of modern technology and safety features, often depending on the specific configuration and optional packages selected. The driver's cockpit is designed for efficiency and comfort, featuring an ergonomically laid-out dashboard with clear instrumentation. Built-in tech typically includes robust diagnostic systems for the engine and drivetrain, allowing for real-time monitoring and troubleshooting. Entertainment systems are generally functional, with options for integrated AM/FM radios, Bluetooth connectivity for hands-free calling and audio streaming, and USB ports for device charging. Higher-end options might include larger touchscreens and integrated navigation systems. Driver-assistance features are becoming increasingly integrated. While not always standard, options can include adaptive cruise control, lane departure warning systems, and advanced emergency braking systems, which are crucial for mitigating accidents in heavy-duty environments. Safety features are paramount. Standard safety equipment includes anti-lock braking systems (ABS), powerful halogen or LED headlights for superior visibility, and robust seatbelt systems. The strong, durable frame and cab construction inherently provide a high level of passive safety. Optional safety enhancements can include blind-spot monitoring, forward-facing cameras, and heated mirrors for improved all-weather visibility. Specific crash-test ratings for heavy-duty trucks like the Peterbilt 377 are not typically provided in the same standardized manner as passenger vehicles by organizations like NHTSA or IIHS. Instead, their safety is evaluated through rigorous internal testing and adherence to stringent industry safety standards and regulations, focusing on occupant protection in various collision scenarios and rollovers.

What Colors Options are Available?

2021 Peterbilt 377 Prices and Market Value

The original MSRP for a 2021 Peterbilt 377 could range significantly, from approximately $120,000 to upwards of $200,000 or more, heavily dependent on the specific configuration, engine, transmission, and vocational equipment installed. On the used market, a 2021 Peterbilt 377 typically commands strong prices due to its reputation for durability and lower mileage compared to older models. You might find them ranging from $80,000 to $150,000, again, highly dependent on condition, mileage, and specifications. Depreciation is generally moderate for well-maintained Peterbilt trucks, especially compared to lighter commercial vehicles. Factors affecting resale value include overall condition, remaining tire life, maintenance records, engine hours, mileage, and the desirability of its specific vocational configuration. Trucks with desirable options and in excellent mechanical and cosmetic shape will always hold their value better.

2021 Peterbilt 377 Cost of Ownership

Owning a 2021 Peterbilt 377 is a significant investment, and associated costs reflect its heavy-duty nature. Insurance premiums will be substantial, influenced by the truck's value, operational radius, and the owner's safety record. Fuel costs are a major ongoing expense, with consumption directly tied to engine choice, load, and duty cycle, typically averaging 5-7 MPG. Maintenance, including regular oil changes, filter replacements, and inspections, is critical for longevity and can be costly due to specialized parts and labor. Repair costs for major components like the engine or transmission can be substantial. Overall, the 377 is not an economical vehicle to own in terms of upfront or immediate running costs, but its long-term durability and robust performance can provide excellent value and lower cost of ownership over many years of reliable service.

2021 Peterbilt 377 Fuel Efficiency

2021 Peterbilt 377 Warranty

2021 Peterbilt 377 Insurance

How Does the 2021 Peterbilt 377 Compare to Other Truck?

The 2021 Peterbilt 377 competes in the demanding heavy-duty vocational and line-haul truck segment, facing stiff competition from other premium manufacturers. Key rivals include Kenworth T880, Freightliner Cascadia, and International LT/HX series. In terms of performance, the Peterbilt 377, often powered by PACCAR or Cummins engines, delivers exceptional power and torque, comparable to its direct competitors. Kenworth trucks, sharing much of their powertrain and chassis with Peterbilt, offer very similar performance. Freightliner often provides a strong balance of power and fuel efficiency with its proprietary engines. Reliability is a strong suit for Peterbilt and Kenworth, both benefiting from robust engineering and build quality, often leading the class in long-term durability. International trucks have made strides in reliability, but historically Peterbilt and Kenworth have held a slight edge in this regard. Features vary widely based on configuration. While all competitors offer customizable cabins and modern amenities, Peterbilt often excels in driver comfort and a premium feel. Freightliner might offer a wider array of cutting-edge technology and driver-assistance features as standard or readily available options on the Cascadia, especially for line-haul applications. In terms of price, Peterbilt and Kenworth typically command a premium due to their brand reputation and build quality, often being at the higher end of the spectrum, with Freightliner and International potentially offering more competitive pricing, especially for fleet purchases. For similar alternatives focusing on vocational versatility and robustness, the Kenworth T880 is an exceptionally close match. If a more aerodynamic and technologically advanced truck for highway hauling is prioritized, the Freightliner Cascadia would be a strong contender, though potentially less specialized for extreme vocational tasks. International's HX series is also a strong vocational competitor.

Final Verdict: Is the 2021 Peterbilt 377 a Good Truck?

The 2021 Peterbilt 377 is ideal for owner-operators and businesses in demanding vocational applications or those seeking a durable, classic-styled long-haul truck. It is particularly well-suited for construction, heavy haulage, and specialized transport where ruggedness and reliability are paramount. It is worth buying if you prioritize long-term durability, strong resale value, and a premium driver experience, and can absorb the higher initial cost. Buying used, especially with lower mileage and thorough maintenance records, can offer excellent value. For new purchases, specific trims and configurations should be meticulously chosen to match the intended application, as customization is key. It is less ideal for budget-conscious buyers or those prioritizing the absolute latest in fuel-saving aerodynamics for long-haul highway use, where other models might offer marginal advantages.

2021 Peterbilt 377 Owner Reviews

Drew B

Drew is a seasoned automotive expert and contributor to VinCheck.info. With nearly 15 years of experience as a former Porsche technician, he brings a wealth of hands-on knowledge to his writing. Born in North Carolina, a region renowned for its deep-rooted NASCAR culture, Drew developed a passion for cars early in life, often building and working on vehicles from a young age. At VINCheck, Drew leverages his extensive technical background to provide in-depth analyses of various vehicles. His articles often focus on engine performance, reliability, and maintenance insights, offering readers practical information grounded in real-world experience. Some of his notable contributions include reviews on the Mazda CX-5's longevity and detailed examinations of engine options for models like the 2011 Toyota Camry and Tacoma