The Volvo Trucks semi truck instrument cluster integrates a high-resolution display with analog gauges, providing critical alerts for safe and efficient operation. Designed for long-haul reliability, the warning system prioritizes drivetrain health, braking performance, and emissions control.
Volvo Trucks semi truck Warning Light Symbols
| Symbol | Name | Color | What it means | What to do |
|---|---|---|---|---|
| Master Warning (Stop) | RED | A critical fault has been detected in the Volvo I-Shift or engine system, requiring immediate safe stop. | Stop the truck in a safe location, contact service immediately. | |
| Master Caution | AMBER | The Volvo vehicle management system has logged a non-critical fault that may need attention soon. | Check the instrument cluster display for specific messages and schedule service. | |
| Check Engine (MIL) | AMBER | The Volvo D13 or D11 engine control unit has detected an emission or performance fault. | Reduce load and drive to nearest Volvo dealer for diagnostic scan. | |
| Engine Oil Pressure | RED | Oil pressure has dropped below safe levels in the Volvo engine, risking severe damage. | Stop engine immediately and check oil level; do not restart. | |
| Battery / Charging | RED | The alternator on your Volvo is not charging the batteries properly or voltage is too low. | Check alternator belt, battery connections, and load test batteries. | |
| Coolant Temperature | RED | Engine coolant temperature in your Volvo has exceeded the normal operating range. | Reduce engine load, idle, check coolant level and fan operation. | |
| Transmission Temp | AMBER | The I-Shift transmission fluid temperature is high, potentially due to heavy load or stop-and-go driving. | Reduce load, shift to a lower gear to allow cooling, stop if persists. | |
| Brake System | RED | A fault in the Volvo air brake system could cause reduced braking performance. | Test brakes carefully, inspect air dryer and lines, do not operate if pedal feels spongy. | |
| ABS | AMBER | The Volvo EBS anti-lock braking system has detected an electrical or wheel speed sensor fault. | Drive cautiously, ABS may not function; have system scanned at service stop. | |
| Parking Brake | RED | The Volvo parking brake is engaged or a fault in the spring brake system exists. | Ensure parking brake is fully released; if light stays, check air pressure and brake chambers. | |
| Tire Pressure (TPMS) | AMBER | One or more tires on your Volvo semi have low pressure, detected by the onboard TPMS. | Check tire pressures and inflate to recommended PSI; inspect for punctures. | |
| Airbag (SRS) | AMBER | The Volvo supplemental restraint system has a fault that may disable airbags in a collision. | Contact Volvo service to diagnose and repair SRS system. | |
| Seat Belt | RED | Driver or passenger seat belt is not fastened while the Volvo is in motion. | Buckle seat belt immediately. | |
| Glow Plug / Preheat | AMBER | The Volvo engine preheat system is active or has a fault in cold start conditions. | Wait for preheat completion before starting; if light flashes, check glow plugs. | |
| DPF / Regeneration | AMBER | The Volvo diesel particulate filter is performing active regeneration to clean the exhaust filter. | Maintain highway speed to complete regeneration; do not park in combustible areas. | |
| DEF / AdBlue | AMBER | DEF fluid level in your Volvo is low or there is a fault in the SCR system. | Refill AdBlue at next stop; if light persists, service may be required to avoid derate. | |
| Water in Fuel | AMBER | Water has been detected in the fuel filter/water separator of your Volvo diesel engine. | Drain water from fuel filter housing; if light remains, replace filter. | |
| Low Fuel | AMBER | The fuel level in your Volvo semi is low, you have approximately 10-15% remaining. | Refuel as soon as possible to avoid running out. | |
| High Beam | BLUE | The Volvo high beam headlights are turned on. | Dim when approaching oncoming traffic. | |
| Power Steering (EPS) | RED | The Volvo electric power steering system has detected a fault, steering may become heavy. | Reduce speed and drive to nearest service; avoid sudden maneuvers. | |
| Reduced Power (Limp Mode) | AMBER | The Volvo engine has entered limp mode due to a detected fault, power is reduced to protect drivetrain. | Drive to a safe location and have the fault diagnosed; avoid high loads. | |
| Air Brake Pressure (Low) | RED | Air brake system pressure in your Volvo is below safe operating level (under ~80 psi). | Stop immediately and wait for air pressure to build; if not, do not drive. | |
| Engine / Exhaust Brake | GREEN | The Volvo I-Shift or exhaust brake is active, providing additional braking on descents. | Use on long downgrades to reduce service brake wear. | |
| Trailer | AMBER | A fault or disconnection in the trailer electrical or braking system is detected by the Volvo. | Check trailer connections, lights, and brakes; repair if needed. | |
| Low Oil Level | AMBER | Engine oil level in your Volvo is below the minimum mark; top up soon. | Check oil level when engine is warm and add recommended Volvo oil. | |
| Door Open | RED | A door on the Volvo semi is open or not fully closed while the truck is moving. | Stop safely and close all doors securely. | |
| High Exhaust Temp (HEST) | AMBER | Exhaust gas temperature in the Volvo aftertreatment system is high during regeneration. | Keep driving until regeneration completes; avoid parking over dry grass. | |
| Washer Fluid Low | AMBER | Windshield washer fluid reservoir is low in your Volvo semi. | Refill with washer fluid to maintain visibility. |
28 symbols shown. Icons follow ISO 2575 dashboard standards; exact graphics vary by model year.
Most Important Warning Lights
Master Warning (Stop)
Common causes
- Engine overheating detected
- Low oil pressure
- Transmission failure imminent
What to do
Stop the Volvo immediately in a safe location. Do not restart; call Volvo roadside assistance for diagnostics.
Air Brake Pressure Low
Common causes
- Air compressor malfunction
- Air leak in brake lines
- Failed air dryer
What to do
Build air pressure by idling engine. If pressure does not rise above 80 psi, do not drive; inspect air system components.
Oil Pressure Low
Common causes
- Low oil level
- Oil pump failure
- Clogged oil filter
What to do
Stop engine immediately. Check oil level and top up; if pressure does not return, have the oil system inspected before restart.
Coolant Temperature High
Common causes
- Low coolant level
- Faulty thermostat
- Radiator fan failure
What to do
Reduce load, idle engine, and check coolant level. If overheating persists, shut down and allow engine to cool before refilling.
Battery Charging Failure
Common causes
- Alternator belt broken
- Alternator failure
- Battery cable corrosion
What to do
Check alternator belt tension and condition; if belt is intact, test alternator output. Charge batteries if needed to start.
Frequently Asked Questions
What does the amber Master Caution light mean on my Volvo semi?
It means the vehicle management system has recorded a non-critical fault. Check the driver display for a specific message; you can continue driving but should schedule service soon.
Why does my Volvo DPF regeneration light come on and what should I do?
The light indicates active regeneration to clean the diesel particulate filter. Maintain highway speed (above 50 mph) to complete the cycle; avoid parking over combustible materials.
How often should I check the DEF (AdBlue) level in my Volvo?
Check the DEF gauge regularly; refill when it drops below 1/4. Running out will cause the engine to de-rate and eventually stop. Use only Volvo-approved DEF fluid.
What should I do if the red brake system warning light comes on?
Immediately test brake feel. If air pressure is low, stop and let the compressor build pressure. If the light stays on with normal pressure, inspect for brake adjustment or electrical faults.
Can I drive with the amber Check Engine light on in my Volvo semi?
Yes, but you may experience reduced power or fuel economy. Have the fault scanned at a Volvo dealer to avoid potential damage or emission non-compliance.
What triggers the Water in Fuel warning on a Volvo truck?
The fuel/water separator sensor detects water accumulation. Drain the water from the separator bowl; if the light persists, replace the fuel filter.