The Mack CHN613 instrument cluster integrates analog gauges with a central digital display, providing real-time status of critical systems. Warning lights are color-coded for immediate recognition: red requires stopping the truck, amber indicates a service need, and green/blue confirms system operation. Understanding these indicators is key to preventing breakdowns and maintaining the CHN613's performance.
Mack CHN613 Warning Light Symbols
| Symbol | Name | Color | What it means | What to do |
|---|---|---|---|---|
| Master Warning (Stop) | RED | This red stop light on the CHN613 demands you pull over immediately; it often accompanies a critical fault like low oil pressure or high coolant temperature. | Stop the truck safely, check the digital display for the accompanying fault, and do not operate until resolved. | |
| Master Caution | AMBER | The amber caution light on your CHN613 signals a non-critical issue that needs attention soon; it typically appears with other warning symbols. | Refer to the digital display for the specific caution and schedule service when possible. | |
| Check Engine (MIL) | AMBER | The check engine light on the CHN613 indicates an emissions or engine management fault; it may reduce power or affect fuel economy. | Have the diagnostic codes read by a Mack dealer as soon as possible. | |
| Engine Oil Pressure | RED | Low oil pressure warning on the CHN613 means the engine is not receiving proper lubrication, risking severe damage. | Stop the engine immediately, check oil level and pressure; do not restart until repaired. | |
| Battery / Charging | RED | This red light on the CHN613 indicates the charging system is failing, often due to a failed alternator or bad battery connection. | Check battery terminals and alternator; if it stays on, do not drive far as you may lose electrical power. | |
| Coolant Temperature | RED | High coolant temperature on the CHN613 warns of engine overheating, which can cause head gasket failure or worse. | Pull over, let engine idle to cool, check coolant level and fan operation; do not drive until normal. | |
| Transmission Temp | AMBER | High transmission temperature on the CHN613 suggests excess heat from heavy load or low fluid. | Reduce speed or stop; check transmission fluid level and allow it to cool. | |
| Brake System | RED | This red brake warning on the CHN613 indicates low brake fluid, air pressure loss, or a brake system fault. | Stop immediately, check air pressure and brake fluid; do not drive until brakes are safe. | |
| ABS | AMBER | The ABS light on the CHN613 means the anti-lock brake system has a fault; standard brakes still work but without ABS. | Have ABS sensors and module inspected by a technician; it is safe to drive but with caution. | |
| Parking Brake | RED | This red light on the CHN613 shows the parking brake is engaged; it also illuminates if the brake is not fully released. | Ensure the parking brake is fully released before moving; if it stays on, check the brake switch. | |
| Tire Pressure (TPMS) | AMBER | Low tire pressure on the CHN613 can increase fuel consumption and tire wear; this amber light alerts you to check pressures. | Check all tire pressures when possible and inflate to recommended PSI. | |
| Seat Belt | RED | The seat belt reminder on the CHN613 flashes when the driver's belt is not fastened; it may also chime. | Fasten your seat belt immediately for safety. | |
| DPF / Regeneration | AMBER | This amber light on the CHN613 indicates the diesel particulate filter needs regeneration to clear soot buildup. | Drive at highway speed to initiate active regeneration, or use the parked regeneration procedure as described in the manual. | |
| DEF / AdBlue | AMBER | Low DEF level or quality issues on the CHN613 will limit engine power; this light warns you to refill DEF. | Add fresh DEF at the next stop; if the light is flashing, system may be degraded. | |
| Water in Fuel | AMBER | Water detected in the fuel system of the CHN613 can damage injectors; drain the water separator soon. | Drain the water separator filter located on the frame rail; if it persists, replace the filter. | |
| Low Fuel | AMBER | Low fuel level on the CHN613 reduces range; refuel to avoid running out of fuel and potential air ingress. | Refuel as soon as possible; do not run the tank dry. | |
| High Beam | BLUE | This blue light on the CHN613 confirms the high beam headlights are active. | Dim the high beams when approaching oncoming traffic. | |
| Cold Coolant | GREEN | The green coolant temperature light on the CHN613 indicates the engine is still cold and not ready for full load. | Allow the engine to warm up before applying heavy throttle. | |
| Reduced Power (Limp Mode) | AMBER | The CHN613 enters reduced power mode when a critical fault is detected, limiting speed to protect the engine. | Pull over safely and contact a Mack service center; continuing may cause damage. | |
| Air Brake Pressure (Low) | RED | Low air pressure in the brake system on the CHN613 makes braking unreliable; this red light warns you of a serious condition. | Stop immediately, let the air compressor build pressure; if it doesn't, do not drive. | |
| Engine / Exhaust Brake | GREEN | This green light on the CHN613 shows the engine brake or exhaust brake is active, aiding downhill speed control. | The retarder is working; no action needed unless the light flashes (fault). | |
| Trailer | GREEN | The green trailer light on the CHN613 indicates a trailer is connected and electrical signals are working. | Confirm the trailer lights are functional; if the light is off, check the connection. | |
| Door Open | RED | This red light on the CHN613 warns that the driver's door is ajar, which could affect cab climate and security. | Close the door completely before driving. | |
| High Exhaust Temp (HEST) | AMBER | High exhaust temperature on the CHN613 occurs during regeneration; this amber light warns you the exhaust is very hot. | Avoid parking over dry grass or combustibles; regeneration will complete automatically. |
24 symbols shown. Icons follow ISO 2575 dashboard standards; exact graphics vary by model year.
Most Important Warning Lights
Low Engine Oil Pressure
Common causes
- Low oil level due to leaks or consumption
- Faulty oil pump or relief valve
- Worn engine bearings causing oil bypass
What to do
On the CHN613, stop the engine immediately. Check the dipstick and top up with 15W-40 oil. If the light stays on, do not restart; tow to a Mack repair facility, as internal damage may have occurred.
Coolant Overheating
Common causes
- Low coolant level from leaks or cap failure
- Failed fan clutch or radiator blockage
- Defective thermostat or water pump
What to do
For the CHN613, pull over, let the engine idle to cool gradually. Check the coolant reservoir when cool; top up with approved coolant. If the fan is not turning, have the fan clutch and radiator inspected.
Air Brake System Failure
Common causes
- Air leak in lines, fittings, or chambers
- Faulty air compressor or governor
- Wet air tanks (excessive moisture) freezing in cold weather
What to do
On the CHN613, check air pressure gauge. If it drops rapidly, locate air leaks with soapy water. Drain air tanks daily. Do not drive with low air pressure; repair any leaks immediately.
Charging System Failure
Common causes
- Loose or corroded battery terminals
- Failed alternator or voltage regulator
- Belt slipping or broken
What to do
On the CHN613, inspect battery connections and clean if corroded. Check the alternator belt tension. If the battery light stays on, the alternator likely needs replacement; avoid long trips until fixed.
DEF/AdBlue System Malfunction
Common causes
- Low DEF fluid level or contaminated fluid
- Faulty DEF pump or injector
- DEF quality sensor failure
What to do
For the CHN613, refill with approved DEF. If the light persists, the system may need a dealer diagnostic to clear fault codes. Continued driving with a malfunction may limit speed to 5 mph.
Frequently Asked Questions
What should I do if the red stop light comes on while driving my Mack CHN613?
Immediately pull over to a safe location and stop the engine. The red stop light indicates a critical fault such as low oil pressure or overheating. Check the digital display for the specific warning and do not continue driving until the issue is resolved.
How can I tell if my CHN613's DPF is regenerating?
The amber DPF regeneration light will illuminate, and you may also notice a high exhaust temperature (HEST) light. The engine may run differently. To assist the process, drive at highway speeds (above 40 mph) for 20-30 minutes, or use the parked regeneration switch if equipped.
Why is my check engine light on and the truck feels sluggish?
The CHN613 may have entered a derate (reduced power) mode to protect the engine. Common causes include a faulty EGR valve, DPF soot level, or DEF quality issue. Have a Mack dealer read the fault codes to diagnose the exact problem.
What does the low air pressure warning mean?
On the CHN613, the air brake system requires at least 100 psi to operate safely. If the red air brake light comes on, it means pressure is below that threshold. Stop immediately, let the compressor build pressure, and check for air leaks. Do not move the truck until pressure is above 100 psi.
How often should I drain the fuel/water separator?
For the CHN613, drain the water separator daily, especially in humid conditions or after refueling. Turn the drain valve at the bottom of the filter until clear fuel comes out. This prevents water from reaching the injectors and causing damage.
What does the green coolant light mean?
The green coolant light on the CHN613 indicates the engine coolant is cold, typically below 40°C (104°F). Allow the engine to warm up by idling for a few minutes before applying heavy load. Once the light turns off, the engine is at operating temperature.