The International ProStar's instrument cluster is designed for long-haul efficiency, with a central LCD display and traditional gauges. Warning lights follow SAE color conventions to quickly communicate urgency. This guide decodes every indicator specific to the ProStar.
International ProStar Warning Light Symbols
| Symbol | Name | Color | What it means | What to do |
|---|---|---|---|---|
| Check Engine (MIL) | AMBER | Indicates a fault in the ProStar's engine management system, often related to emissions or fuel system. | Check engine codes with a diagnostic tool; reduce load and visit service center. | |
| Engine Oil Pressure | RED | Low oil pressure detected in the ProStar's 13L or 15L engine; can cause severe damage. | Pull over immediately, shut down engine, check oil level. | |
| Battery / Charging | RED | The ProStar's charging system voltage is too low, indicating alternator or battery issue. | Check alternator belt and battery connections; if persists, replace alternator. | |
| Coolant Temperature | RED | Engine coolant temperature exceeds safe limits for the ProStar, risk of overheating. | Pull over, idle engine to cool, check coolant level and fan operation. | |
| ABS | AMBER | Anti-lock brake system fault detected on ProStar; normal braking still works but ABS disabled. | Have ABS sensors and module checked at next service stop. | |
| Parking Brake | RED | Parking brake is engaged or not fully released on the ProStar; vehicle can't move. | Release parking brake fully; if light stays, check brake valve. | |
| Brake System | RED | General brake system fault on ProStar, could be low air pressure or hydraulic issue. | Stop safely, check air pressure gauges and brake fluid. | |
| Air Brake Pressure (Low) | RED | Air brake system pressure below 60 psi on ProStar; brakes may not engage. | Let air pressure build by idling; if not rising, check compressor or leaks. | |
| DPF / Regeneration | AMBER | Diesel particulate filter is full and requires regeneration on ProStar SCR system. | Drive at highway speed to initiate passive regen; if light stays, perform parked regen. | |
| DEF / AdBlue | AMBER | Diesel exhaust fluid level is low or quality issue on ProStar; engine power may degrade. | Add DEF at next stop; use only approved fluid. | |
| Water in Fuel | AMBER | Water detected in the fuel/water separator on ProStar; can damage injectors. | Drain water separator immediately. | |
| Glow Plug / Preheat | AMBER | Glow plugs are active or fault in preheat system on ProStar cold start. | Wait for light to turn off before cranking; if flashing, check glow plug relay. | |
| Low Fuel | AMBER | Fuel level is below 1/8 tank on ProStar; range limited. | Refuel as soon as possible. | |
| High Beam | BLUE | High beam headlights are on for the ProStar. | Dim when approaching oncoming traffic. | |
| Seat Belt | RED | Driver seat belt not fastened while ProStar is in motion. | Fasten seat belt immediately. | |
| Transmission Temp | RED | Transmission fluid temperature is too high on ProStar, risk of damage. | Reduce load and shift to lower gear; pull over if light stays. | |
| Reduced Power (Limp Mode) | AMBER | ProStar engine has entered limp mode due to a detected fault, power output limited. | Pull over when safe and check for fault codes using diagnostic tool. | |
| Fasten Seat Belt | RED | Audible and visual reminder to fasten seat belt on ProStar; same as seatbelt light. | Fasten seat belt. | |
| Trailer | GREEN | Trailer ABS or connection status; green indicates trailer connected and system ok on ProStar. | If amber, check trailer ABS wiring. |
19 symbols shown. Icons follow ISO 2575 dashboard standards; exact graphics vary by model year.
Most Important Warning Lights
Engine Overheating
Common causes
- Low coolant level
- Radiator fan failure
- Thermostat stuck closed
What to do
Pull over, idle engine, check coolant level at radiator tank. If safe, add coolant; if not, call service for ProStar.
Low Oil Pressure
Common causes
- Low oil level
- Oil pump failure
- Clogged oil filter
What to do
Stop engine immediately, check dipstick, add oil if needed. If light remains, do not restart; tow to shop.
Air Brake Failure
Common causes
- Compressor failure
- Air leak in lines
- Moisture in air tanks
What to do
Park and let engine build pressure; if pressure doesn't rise, check compressor drive belt and listen for leaks. Service immediately.
DPF Regeneration Fault
Common causes
- DPF full
- Sensor issue
- Frequent short trips
What to do
Drive at highway speed for 20 minutes; if light persists, perform parked regen per ProStar manual.
DEF Quality/Level
Common causes
- Low DEF level
- Contaminated DEF
- DEF heater failure
What to do
Add fresh DEF from sealed container; if light stays, have DEF system inspected at Cummins dealer.
Frequently Asked Questions
What does the yellow 'Check Engine' light mean on my ProStar?
It indicates a fault in the emissions or engine management system; the engine can still run, but you should get the diagnostic codes read.
Why is my red brake light staying on after releasing parking brake?
It could be low air pressure in the brake system or a faulty brake switch. Check air gauges; if below 100 psi, idle until it recovers; if not, inspect for leaks.
How do I tell if the ProStar's DPF regen is active?
The exhaust temperature will rise, and you may see a 'DPF Active' message or an amber regen light. You can also monitor the soot level via the dash display.
Can I drive with the amber ABS light on?
Yes, normal braking works, but ABS is disabled. Drive cautiously, especially in slippery conditions, and have it serviced soon.
What does the 'Water in Fuel' light mean?
It means there is water in the fuel-water separator, which can damage injectors. Drain the separator using the valve at the bottom of the filter housing.
My ProStar shows a blue high beam indicator but the lights are dim. What's wrong?
The blue light only indicates high beam is selected; if actual output is dim, check for burned-out bulbs, poor ground, or a faulty headlight relay.