2021 Volvo VNR Service and Repair Manual

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Factory-Grade Data

2021 Volvo VNR service and repair manual — a detailed, factory-style reference for maintenance, diagnostics, and repair. Use it to confirm correct procedures, specifications, and system coverage before you start work.

Designed for technicians and DIY owners, this manual helps you troubleshoot accurately, follow step-by-step repair procedures, and reference wiring diagrams and system sections quickly while you work.

What’s included

  • Step-by-step repair procedures and service information
  • Specifications and reference data (where provided)
  • Wiring diagrams and electrical sections
  • Powertrain, brakes, steering, suspension, HVAC and more

Trims covered

  • Base Straight Truck - Long Conventional
  • Base Tractor Truck - Long Conventional

Engines covered

  • 12.8L 780Cu. In. 6 DIESEL
  • 8.9L 8849CC 540Cu. In. l6 CNG Turbocharged
  • 12.8L 780Cu. In. l6 DIESEL
  • 10.8L 661Cu. In. l6 DIESEL Turbocharged
  • ELECTRIC

Index / Table of contents

  • Body
  • Brakes
  • Chassis Electrical
  • Driveline
  • Engine Cooling
  • Engine Electrical
  • Engine Mechanical
  • Engine Performance & Emission Controls
  • Fuel System
  • General Information & Identification
  • Heating, Ventilation, & Air Conditioning
  • Hybrid & Electric Vehicle Systems
  • Steering
  • Suspension
  • Transmission, Clutch, & Transfer Case
  • Wiring Diagrams

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Vehicle Safety Data

2021 Volvo VNR Recalls & Complaints

NHTSA #20V24100029/04/2020Component: STEERING

Volvo Trucks North America (Volvo Trucks) is recalling certain 2020-2021 VNL and VNR trucks. The steering gear fasteners may have not been properly tightened.

Consequence

The loose fasteners may result in a loss of vehicle control, increasing the risk of a crash.

Remedy

Volvo Trucks will notify owners, and dealers will tighten the steering gear fasteners to specificati

NHTSA #23V28000019/04/2023Component: ELECTRICAL SYSTEM:PROPULSION SYSTEM:TRACTION BATTERY:THERMAL MANAGEMEN

Volvo Trucks North America (Volvo Trucks) is recalling certain 2020-2024 VNR Electric vehicles. The coolant line in the high voltage battery pack may not be fully seated and locked, which can result

Consequence

A battery short circuit increases the risk of a fire.

Remedy

Volvo Trucks will work with the battery manufacturer Akasol to inspect and replace the batteries, as

NHTSA #23V25500007/04/2023Component: EQUIPMENT ADAPTIVE/MOBILITY:VEHICLE CONTROLS:BRAKING

Volvo Trucks North America (Volvo Trucks) is recalling certain 2020-2023 VNR Electric vehicles equipped with Adaptive Cruise Control (ACC). When the adaptive cruise control braking activates under li

Consequence

Overly aggressive braking can result in the rear axle skidding, the brakes locking up, and/or a loss

Remedy

Dealers will secure wiring and remove radar antennas and brackets from the vehicle. The anti-lock b

NHTSA #20V53500002/09/2020Component: STEERING

Volvo Trucks North America (Volvo Trucks) is recalling certain 2021 VNL, VHD, and VNR vehicles. The king pin nut may not have been installed or properly tightened during axle assembly.

Consequence

If the king pin is missing or not tightened properly, the knuckle may separate from the axle, increa

Remedy

Volvo Trucks will notify owners, and dealers will inspect the vehicle to make sure that the king pin

NHTSA #20V53600002/09/2020Component: SERVICE BRAKES, AIR

Volvo Trucks North America (Volvo Trucks) is recalling certain 2020-2021 VAH, VHD, VNL and VNR vehicles. The die cast pedal plate may break at one of its attachment points, possibly resulting in the

Consequence

A dislodged brake pedal would be inoperable, increasing a risk of a crash.

Remedy

Volvo Trucks will notify owners, and dealers will inspect and replace the pedal plates if required,

NHTSA #20V38400001/07/2020Component: EQUIPMENT:OTHER:LABELS

Volvo Trucks North America (Volvo) is recalling certain 2018-2021 VNL and VNR buses. The Gross Axle Weight Rating (GAWR) for the rear drive axles stated on the Federal Certification Label exceeds the

Consequence

If the rear axles are overloaded, over time the wheel hubs may fail prematurely, increasing the risk

Remedy

Volvo will notify owners and send corrected replacement labels, free of charge. The recall began Au

TSB #10253824

CBR: Chassis Equipped With VECU5 Active Datalink/Communication Faults For Multiple Modules; ABS And SRS Communication Faults.

TSB #10252316

CBR: On a Volvo Chassis - US16 - with the Bendix Lane Departure Warning System ( LDW )the alarm would not cancel once the turn signals were activated.

TSB #10252317

CBR: Vehicles built with an 11 liter engine may experience a complaint of excessive fuel in the oil. It is possible that the source of the fuel is the rear fuel galley plug in the cylinder head.

TSB #10252318

CBR: It may be possible for Bergstrom controlled Eberspacher Espar parking heaters to ignite and burn for 5 min and never start again.

TSB #10252321

CBR: After cluster replacement and programming, the Driver Information Display (DID) may not function as designed.

TSB #10251323

CBR - Active "Set Park Brake" Message On Drivers Information Display (DID)

TSB #10251319

CBR - Automated Manual Transmission ( AMT ) Flywheel Pilot Bearing Wear On Input Shaft.

TSB #10251325

CBR - Telematics Gateway (TGW) Connect Ability Issues.

Showing the 8 most recent of 138 technical service bulletins on file with NHTSA.

20230515Component: VISIBILITY/WIPER

This Is a volvo semi tractor 2021 the original sunvisor was removed from tractor. And an off brand replacement was installed which is substantially smaller by 4 inches on each side of visor + it's mo

20230515Component: UNKNOWN OR OTHER

This Is a volvo semi tractor 2021 the original sunvisor was removed from tractor. And an off brand replacement was installed which is substantially smaller by 4 inches on each side of visor + it's mo

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