The Mack CXU613 semi truck features a comprehensive instrument cluster with clear warning indicators to keep your haul on schedule. From engine performance to braking systems, each light is designed to protect your truck and cargo.
Mack CXU613 Warning Light Symbols
| Symbol | Name | Color | What it means | What to do |
|---|---|---|---|---|
| Master Warning (Stop) | RED | A critical fault is detected in the Mack CXU613's engine or drivetrain that requires immediate shutdown to prevent damage. | Safely pull over and stop the engine. Contact Mack service. | |
| Master Caution | AMBER | A non-critical system in your CXU613 needs attention; check the message display for the specific issue. | Check driver information display for details and schedule service soon. | |
| Check Engine (MIL) | AMBER | The Mack CXU613's engine management system has detected an emissions or performance fault that requires diagnosis. | Reduce speed and service the engine at a Mack dealer. | |
| Engine Oil Pressure | RED | Engine oil pressure is too low in your CXU613, risking severe engine damage if not addressed immediately. | Stop engine immediately, check oil level, and do not restart until fault is cleared. | |
| Battery / Charging | RED | The charging system voltage is outside normal range, possibly due to alternator failure or loose belt on your CXU613. | Check connections and alternator; if light stays on, have electrical system tested. | |
| Coolant Temperature | RED | Engine coolant temperature is above safe operating limits in the Mack CXU613, risking overheating. | Pull over, let engine cool, check coolant level and fan operation. | |
| Transmission Temp | AMBER | Transmission fluid temperature is elevated, which may reduce shift quality and damage components if ignored on your CXU613. | Reduce load and gear down; if light persists, service transmission. | |
| Brake System | RED | A major brake system fault exists on your CXU613, such as low air pressure or hydraulic failure, compromising stopping capability. | Stop safely and do not drive until brake system is inspected. | |
| ABS | AMBER | The anti-lock braking system on your CXU613 has a fault; standard brakes still work but ABS may not engage during panic stops. | Drive cautiously to a service center; trailer ABS may also trigger this light. | |
| Parking Brake | RED | The parking brake is engaged on your CXU613; release before moving to avoid damage and wear. | Release parking brake fully before driving. | |
| DPF / Regeneration | AMBER | The diesel particulate filter on your Mack CXU613 is active or needs cleaning; regeneration is in progress or required. | If flashing, drive at highway speeds to initiate regen; if solid, service DPF system. | |
| DEF / AdBlue | AMBER | Diesel exhaust fluid level is low or quality is poor in your CXU613, which can reduce engine power and cause emissions non-compliance. | Refill DEF tank with fluid meeting ISO 22241 specifications. | |
| High Beam | BLUE | High beam headlights are activated on your CXU613 for increased visibility at night or in low-light conditions. | Dim to low beams when approaching other traffic. | |
| Air Brake Pressure (Low) | RED | Air pressure in the brake system is below the safe operating threshold on your CXU613, risking brake failure. | Stop immediately and build air pressure before moving; check for leaks. |
14 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 blockage or fan failure
- Thermostat stuck closed
What to do
Check coolant level and add approved mixture. Inspect radiator for debris and ensure fan clutch engages. On your CXU613, flush cooling system per Mack maintenance schedule.
Low Oil Pressure
Common causes
- Insufficient oil level
- Oil pump failure
- Clogged oil filter
What to do
Stop engine immediately. Check dipstick and add oil if low. If pressure remains low, do not restart; have your CXU613 towed to a Mack service center.
DPF Clogged
Common causes
- Frequent short trips preventing passive regeneration
- Excessive idling
- Engine oil level too high
What to do
Drive at steady highway speed for 20 minutes to perform active regeneration. If warning persists, take your CXU613 to a dealer for forced regeneration or replacement.
Air Brake System Leak
Common causes
- Damaged air line or fitting
- Faulty brake chamber
- Compressor malfunction
What to do
Listen for air leaks near wheels and under cab. Apply soapy water to suspect areas. Do not drive unless pressure builds; have your CXU613's air system repaired by a qualified technician.
DEF System Malfunction
Common causes
- Low DEF quality or contamination
- DEF heater failure
- NOx sensor fault
What to do
Top off with fresh DEF (ISO 22241). If light remains, diagnostic scan at a Mack dealer required; driving with active DEF fault may result in speed limitation.
Frequently Asked Questions
Why did my Mack CXU613's check engine light come on with no noticeable performance change?
Many emissions-related faults trigger the MIL without immediate power loss. Common causes include a loose fuel cap, faulty EGR valve, or sensor drift. Have the codes read at a Mack dealer to prevent worsening.
What should I do if the DPF regeneration light flashes while I'm driving?
This indicates active regeneration is occurring. Continue driving at highway speeds if possible. Avoid idling or shutting off the engine until the light goes out. On your CXU613, regen typically lasts 20-40 minutes.
How often should I replace the air filters on my Mack CXU613?
Inspect the air filter restriction gauge monthly. Replace when the yellow band enters the red zone or every 30,000-50,000 miles under normal conditions. Off-road or dusty environments require more frequent changes.
The ABS light stays on; can I still drive the truck?
Yes, standard brakes operate normally, but ABS will not engage during hard braking. Drive cautiously, especially on slippery roads. Have your CXU613's ABS sensors and wiring checked at the earliest opportunity.
What causes the transmission temperature warning to come on?
Usually from heavy loading, prolonged low-gear operation, or low transmission fluid. Check fluid level with engine running and at operating temp. On your CXU613, use only approved synthetic transmission fluid.
My Mack CXU613's battery light flickers occasionally; is that a major concern?
A flickering battery light often indicates a loose alternator belt or intermittent charging connection. It can lead to a dead battery. Inspect belt tension and wiring; if persists, have the alternator output tested soon.