Engine Fault
Volvo Trucks Commercial Truck
Severity: ModerateWhat it means
A Volvo Truck amber engine warning indicates a D13 or D16 engine fault.
A J1939 scan tool reads SPN and FMI codes.
Volvo PTT (Premium Tech Tool) is the official software for detailed diagnosis.
Affected Models
- Volvo VNL
- Volvo VNR
- Volvo VHD
- Volvo VAH
- Volvo VNX
Common Causes
- D13/D16 engine sensor fault (boost, EGR, NOx)
- EGR valve fault or carbon buildup
- Turbocharger actuator fault
- DPF or DOC sensor failure
- Aftertreatment NOx sensor fault
How to Fix It
-
Check warning urgency.
Amber check engine = stored fault, usually drivable.
Red stop engine or rapidly flashing amber = serious — pull over safely as soon as practical. -
Read fault codes with a J1939 scan tool.
Plug a heavy-duty scanner (JPRO, Noregon DLA, Texa IDC5) into the J1939 connector.
SPN identifies the component or signal; FMI identifies the type of fault. -
Inspect basic items.
Check oil, coolant, and DEF levels.
Look for visible leaks, disconnected hoses, and damaged sensors.
Many fault codes have simple physical causes. -
Take to a Volvo Trucks dealer for complex faults.
Volvo PTT is required for most engine resets, EGR cleaning procedures, and parameter changes.
A Volvo dealer can perform full diagnostics.
When to Call a Professional
Volvo PTT is the official Volvo/Mack diagnostic software.
For complex faults, especially those requiring actuator tests or parameter resets, a Volvo dealer is the most efficient route.
Frequently Asked Questions
What is Volvo PTT?
PTT (Premium Tech Tool) is Volvo Group's official diagnostic and engineering software, used for both Volvo and Mack trucks. It reads detailed fault data, performs actuator tests, and allows parameter changes. PTT is dealer-restricted but available to authorised shops.
Can I use Mack and Volvo Truck scan tools interchangeably?
Yes. Volvo and Mack share the same diagnostic platform — PTT works on both brands. Many third-party heavy-duty tools (JPRO, Noregon DLA) also support both Volvo and Mack.