The Kenworth T370's instrument cluster provides essential alerts for vocational trucking. Key indicators monitor engine health, braking systems, and exhaust aftertreatment to ensure reliable operation in demanding applications.
Kenworth T370 Warning Light Symbols
| Symbol | Name | Color | What it means | What to do |
|---|---|---|---|---|
| Master Warning (Stop) | RED | Illuminates when a critical fault is detected; the T370's central warning light demands immediate driver attention. | Safely stop the truck, consult the primary display message, and address the underlying issue. | |
| Master Caution | AMBER | Activates for non-critical system alerts; on the T370 it may accompany minor faults that still need prompt service. | Check the gauge cluster message and schedule maintenance at your earliest convenience. | |
| Check Engine (MIL) | AMBER | Lit when the T370's PACCAR engine or emissions system detects a fault affecting performance or compliance. | Have the fault codes read by a Kenworth dealer and repair as needed. | |
| Engine Oil Pressure | RED | This red indicator warns of low oil pressure in the T370's engine, risking severe internal damage. | Stop the engine immediately and check oil level; if OK, do not run until pressure is restored. | |
| Battery / Charging | RED | Indicates the T370's charging system is not maintaining battery voltage, typically due to alternator or wiring issues. | Reduce electrical loads and head to a service bay; avoid jump-starting unless necessary. | |
| Coolant Temperature | RED | Signals the T370's engine coolant has exceeded safe operating temperature, risking overheating. | Pull over, idle engine to cool, and inspect coolant level and fan operation. | |
| Transmission Temp | AMBER | Warns that the T370's transmission fluid is hotter than normal; prolonged operation may reduce shift quality. | Shift to a lower gear or reduce load; allow transmission to cool before resuming heavy hauling. | |
| Brake System | RED | A serious alert for the T370's service brake system, indicating low fluid, pressure loss, or mechanical fault. | Stop safely. Do not drive. Check brake fluid level and have the system inspected immediately. | |
| ABS | AMBER | The T370's anti-lock brake system has detected a malfunction; standard braking remains but ABS assist is off. | Drive cautiously to a repair facility; the ABS may not engage during panic stops. | |
| Parking Brake | RED | Illuminates when the T370's parking brake is engaged; if flashing, a fault exists in the brake circuit. | Ensure the parking brake is fully released before driving; if flashing, service brake system. | |
| Tire Pressure (TPMS) | AMBER | Alerts to low pressure in one or more of the T370's tires; sustained pressure loss can affect fuel economy and safety. | Check tire pressures when safe, inflate to recommended PSI, and inspect for punctures. | |
| Seat Belt | RED | Reminds the T370 driver to fasten their seat belt; the chime will sound until buckled. | Fasten your seat belt immediately. | |
| Glow Plug / Preheat | AMBER | In cold weather, this T370 indicator shows the engine preheat is active; do not crank until it extinguishes. | Wait for the light to turn off before starting the engine in low temperatures. | |
| DPF / Regeneration | AMBER | The T370's diesel particulate filter needs cleaning; steady means active regeneration, flashing indicates a fault. | If steady, maintain speed to allow passive regen; if flashing, schedule dealer service. | |
| DEF / AdBlue | AMBER | Low Diesel Exhaust Fluid level on the T370; refill to prevent engine derate and maintain emissions compliance. | Add DEF at your earliest convenience; driving beyond empty will reduce engine power. | |
| Water in Fuel | AMBER | Detects water accumulation in the T370's fuel separator; if ignored, it can damage the injection system. | Drain the water separator immediately; if light persists, check for contaminated fuel. | |
| Low Fuel | AMBER | Indicates the T370's fuel level is critically low; continue to a station to avoid running dry and introducing air into the system. | Refuel as soon as possible; avoid operating below E to prevent fuel system damage. | |
| High Beam | BLUE | Illuminates when the T370's high beam headlights are on, providing maximum forward visibility. | Dim high beams when approaching oncoming traffic. | |
| Power Steering (EPS) | AMBER | Warns of a malfunction in the T370's electric power steering system; normal steering remains but with increased effort. | Drive with caution to the nearest service center; check the power steering fluid level if applicable. | |
| Reduced Power (Limp Mode) | AMBER | The T370's engine control unit has limited power to protect the drivetrain/emissions; performance will be reduced. | Proceed to a service facility at reduced speed; have fault codes diagnosed promptly. | |
| Air Filter | AMBER | Monitors intake restriction; the T370's air filter needs inspection or replacement to maintain engine efficiency. | Replace the engine air filter; if light persists, check for duct blockage. | |
| Fuel Filter / Water Separator | AMBER | Alerts to fuel filter restriction or water separator needing service on the T370's fuel system. | Replace the fuel filter and drain the water separator; reset the indicator if needed. | |
| Service / Hour Meter | AMBER | Indicates that the T370 has reached a scheduled maintenance interval; service is due based on engine hours. | Schedule oil change and inspection per the Kenworth maintenance schedule. | |
| Work Lights | GREEN | Confirms the T370's optional work lights are activated for better visibility at job sites. | Turn off work lights when not needed to conserve battery. | |
| Beacon / Rotating Light | GREEN | Lights when the T370's roof beacon is switched on for increased roadside visibility. | Activate beacon only when required by safety regulations; turn off when parked. | |
| Differential Lock | AMBER | Shows that the T370's differential lock is engaged; use only on low-traction surfaces to prevent driveline damage. | Disengage the diff lock once traction is regained and avoid sharp turns. | |
| PTO Engaged | GREEN | Illuminates when the T370's power take-off is active, running auxiliary equipment like a winch or hydraulics. | Never drive with PTO engaged; disengage before moving the truck. | |
| Air Brake Pressure (Low) | RED | Critical warning that the T370's air brake system pressure is below safe operating level (below 60 psi). | Stop immediately; do not drive until air pressure builds to at least 100 psi. Check for leaks. | |
| Engine / Exhaust Brake | AMBER | Indicates the T370's auxiliary braking system is engaged, augmenting service brakes on grades. | Disengage retarder on slippery roads; use on long descents to avoid brake fade. | |
| Trailer | AMBER | Monitors the T370's trailer connection; lit if trailer lights or ABS communication is lost. | Check trailer electrical connector and wiring; have the trailer system inspected. | |
| Door Open | RED | Alerts that the T370's driver or passenger door is ajar; can trigger a chime if speed is above zero. | Securely close all doors before driving. | |
| High Exhaust Temp (HEST) | AMBER | Warns that the T370's exhaust system is hot during DPF regeneration; avoid parking over combustibles. | Park away from dry grass or debris; keep engine running during active regeneration. | |
| Washer Fluid Low | AMBER | Indicates low windshield washer fluid level in the T370's reservoir; refill to maintain vision. | Top off with washer fluid; use winter-grade fluid in cold climates. |
33 symbols shown. Icons follow ISO 2575 dashboard standards; exact graphics vary by model year.
Most Important Warning Lights
Engine Oil Pressure Failure
Common causes
- Low oil level
- Oil pump malfunction
- Worn bearings or oil gallery leak
What to do
Stop the T370 immediately. Check oil level and top off if low. If pressure does not return, do not restart; tow to a Kenworth service center for pump or bearing inspection.
Battery Charging Failure
Common causes
- Alternator belt failure
- Faulty alternator/regulator
- Corroded battery connections
What to do
Reduce electrical loads and head directly to a repair shop. Check belt tension and battery terminals. If alternator is dead, replace before battery drains completely.
Brake System Malfunction
Common causes
- Low brake fluid
- Air in hydraulic system (or air brake leak)
- Worn brake pads/shoes
What to do
Stop safely and do not drive. Check brake fluid reservoir. For air brakes, build pressure; if leak persists, have a technician inspect all lines and chambers.
Coolant Overheat
Common causes
- Low coolant level
- Faulty fan clutch/thermostat
- Blocked radiator or collapsed hose
What to do
Pull over, idle engine to cool. Check coolant level when safe (engine cool). If overheating continues, do not run engine; have the cooling system flushed and repaired.
Low Air Brake Pressure
Common causes
- Air leak in system
- Faulty compressor
- Moisture freezing in lines (cold weather)
What to do
Stop immediately; do not attempt to drive until pressure builds to 100+ psi. Inspect for hissing leaks around fittings; if pressure drops rapidly, call for roadside service.
Frequently Asked Questions
What does the amber 'DPF Regeneration' light on my Kenworth T370 mean?
It indicates the diesel particulate filter is actively cleaning itself. Drive at highway speeds to aid passive regeneration; if the light flashes or stays on solid, a manual regeneration or dealer service may be needed.
Can I drive my T370 with the Master Warning light on?
No. The red Master Warning indicates a critical issue. You should safely pull over and check the central display for the specific fault—continuing to drive can cause major engine or drivetrain damage.
Why does my T370's check engine light come on after refueling?
It could be a loose fuel cap triggering an evaporative leak code. Tighten the cap. If the light stays on, the engine computer may need to be reset or the fault diagnosed by a dealer.
How often should I service the air filter on my T370?
Replace the engine air filter every 30,000 miles or when the air filter restriction light illuminates. In dusty environments, inspect it more frequently per the Kenworth maintenance schedule.
What should I do if the transmission temperature warning activates?
Reduce engine load and vehicle speed. If possible, shift to a lower gear to decrease transmission heat. If the light does not go out after a few minutes, pull over and let the transmission cool in neutral.
Is it normal for the high exhaust temperature light to come on during a DPF regen?
Yes, the T370's exhaust system can reach high temperatures during active regeneration. Do not park over dry grass or flammable materials. The light will turn off once regeneration completes.