The Volvo Trucks VNM's instrument cluster provides real-time alerts tailored for heavy-duty operations. This guide explains the VNM-specific symbols and actions to ensure safe and efficient driving.
Volvo Trucks VNM Warning Light Symbols
| Symbol | Name | Color | What it means | What to do |
|---|---|---|---|---|
| Master Warning (Stop) | RED | A serious fault is detected that requires immediate engine shutdown to prevent damage on your VNM. | Safely pull over, shut down engine, and contact Volvo service. | |
| Master Caution | AMBER | A non-critical system fault has been logged in the VNM's electronic control unit; check the message center. | Drive to a service facility at your earliest convenience. | |
| Check Engine (MIL) | AMBER | The VNM's emissions control system requires attention; reduced fuel economy may occur. | Schedule diagnostics with a Volvo dealer; avoid extended idling. | |
| Engine Oil Pressure | RED | Oil pressure is critically low in the VNM's D13 or D11 engine, risking internal damage. | Immediately stop the engine and check oil level; do not restart. | |
| Battery / Charging | RED | The VNM's alternator is not charging or the battery voltage is too low. | Inspect alternator belt and connections; call roadside assistance. | |
| Coolant Temperature | RED | Engine coolant temperature exceeds safe limits on your VNM; continued operation may cause damage. | Pull over, idle engine to cool, check coolant level. | |
| Transmission Temp | AMBER | The I-Shift transmission fluid is running hot in the VNM; reduce load or speed. | Shift to a lower gear and avoid heavy throttle until temperature drops. | |
| Brake System | RED | A fault in the VNM's brake system reduces stopping capability; might be low air pressure. | Stop safely, check air pressure gauges, and inspect for leaks. | |
| ABS | AMBER | The antilock brake system on your VNM has a fault; standard brakes still work but without ABS. | Drive cautiously and have the ABS serviced soon. | |
| Parking Brake | RED | The parking brake is engaged on the VNM; do not drive unless released. | Release the parking brake before moving. | |
| Tire Pressure (TPMS) | AMBER | One or more tires on your VNM are significantly underinflated, affecting fuel economy and safety. | Check tire pressures and inflate to recommended levels. | |
| Glow Plug / Preheat | AMBER | The VNM's intake heater is active to aid cold starting; wait for the light to go out. | Wait until the light extinguishes before cranking the engine. | |
| DPF / Regeneration | AMBER | The diesel particulate filter on your VNM needs a parked regeneration to clear soot buildup. | Park, engage parking brake, and press the regen switch. | |
| DEF / AdBlue | AMBER | Diesel exhaust fluid level is low on the VNM; engine power may be reduced if ignored. | Refill DEF at the next stop; use Volvo-approved fluid. | |
| Water in Fuel | AMBER | Water has accumulated in the VNM's fuel filter/water separator; drain promptly. | Open the drain valve on the fuel filter housing to remove water. | |
| Low Fuel | AMBER | The VNM's fuel level is below 15% of tank capacity. | Refuel as soon as possible to avoid running out. | |
| High Beam | BLUE | The high-beam headlights are activated on your VNM. | Dim when approaching other vehicles. | |
| Air Brake Pressure (Low) | RED | Air brake pressure in the VNM is below 60 psi; brakes may not apply fully. | Stop immediately and allow air pressure to build; check for leaks. | |
| Engine / Exhaust Brake | GREEN | The VNM's engine brake or exhaust brake is engaged to assist downhill speed control. | The brake is active; no action needed. | |
| Trailer | GREEN | A trailer is detected and connected to the VNM's electrical system. | Verify trailer lights before departure. | |
| High Exhaust Temp (HEST) | AMBER | The VNM's exhaust aftertreatment system is hot; avoid parking on dry grass. | Park only on paved surfaces until the light goes out. |
21 symbols shown. Icons follow ISO 2575 dashboard standards; exact graphics vary by model year.
Most Important Warning Lights
Engine Oil Pressure Low
Common causes
- Low oil level
- Oil pump failure
- Oil pressure sensor fault
What to do
On your VNM with a D13 engine, immediately stop the engine. Check the oil level using the dipstick; if low, add oil of the correct viscosity. If level is fine, have the oil pressure system inspected by a Volvo technician before restarting.
Coolant Overheating
Common causes
- Low coolant level
- Broken thermostat
- Cooling fan malfunction
What to do
Pull over and idle the VNM to allow the electric fan to cool. Check coolant level in the degas bottle; add Volvo-approved coolant if needed. Do not open the hot radiator cap. If light persists, tow to a Volvo service center.
Low Air Brake Pressure
Common causes
- Air system leak
- Failed air compressor
- Governor malfunction
What to do
Stop the VNM immediately. Let the engine run to build pressure; if pressure does not rise above 60 psi, inspect air lines and fittings for leaks. A failing air compressor may require replacement by a Volvo dealer.
Battery Charging Failure
Common causes
- Faulty alternator
- Loose or corroded battery cables
- Broken serpentine belt
What to do
Turn off unnecessary electrical loads. Check the alternator belt on your VNM for tension; if loose, tighten or replace. Clean battery terminals. If the light stays on, have the charging system tested at a Volvo shop.
Transmission Overheat
Common causes
- Overloaded truck
- Low transmission fluid
- Cooler blockage
What to do
Reduce speed and shift the I-Shift to a lower gear. Avoid stop-and-go traffic. Check transmission fluid level with the engine running at idle. If low, add Volvo transmission fluid. Have the cooling system inspected if overheating persists.
Frequently Asked Questions
Why does the amber DPF regen light stay on for so long in my VNM?
The VNM's DPF requires a parked regeneration when soot load exceeds 80%. After pressing the regen switch, the process can take 20–40 minutes. Ensure the truck is parked on a non-combustible surface with the parking brake engaged.
What should I do if the red brake system light comes on while driving?
Immediately reduce speed and pull over. The VNM's brake system may have lost air pressure. Check the air gauges; if below 60 psi, wait for the compressor to build pressure. If pressure doesn't rise, call for service.
How do I clear the water-in-fuel light on my VNM?
Locate the fuel filter/water separator on the driver side of the engine. Open the drain valve at the bottom until clear fuel flows, then close. The light should reset after a few minutes of running.
Can I continue driving with the amber check engine light on?
Yes, but the VNM may enter derate mode to protect the engine. Reduce load and schedule a diagnostic scan at the next Volvo dealer. Prolonged driving could cause damage or emissions issues.
Why does the DEF light come on even after refilling?
The VNM's DEF system uses a quality sensor. If non-standard fluid was added, it may not be recognized. Use only Volvo-approved AdBlue. Also ensure the tank cap is tight; air in the system can cause false warnings.
What does the green trailer symbol mean on the VNM dashboard?
It indicates the VNM's electronic control unit has detected an electrical connection to a trailer. Verify all trailer lights are working before departure. The light remains on as long as the trailer is attached.