2021 Volvo VNX Service and Repair Manual

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Factory-Grade Data

2021 Volvo VNX 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

Engines covered

  • 12.8L 780Cu. In. 6 DIESEL

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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Payment methods

  • American Express
  • Apple Pay
  • Bancontact
  • Google Pay
  • Maestro
  • Mastercard
  • PayPal
  • Union Pay
  • Visa

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Vehicle Safety Data

2021 Volvo VNX Recalls & Complaints

No active recalls The 2021 Volvo VNX has no recalls on file with NHTSA.
TSB #10253821

CBR: Turbo Compound 2nd Generation - EGR And / Or DPF Diagnostic Trouble Codes (DTC), Diagnostic And Repair Information.

TSB #10253819

CBR: Turbo Compound (TC) Hot Side Noise, Diagnostic Information.

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 #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.

Showing the 8 most recent of 125 technical service bulletins on file with NHTSA.

No complaints filed No consumer complaints on file with NHTSA for the 2021 Volvo VNX.
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