Isuzu Warning Lights and Meanings
Complete guide to Isuzu dashboard warning lights and symbols. Learn what each indicator means and what action you should take when they illuminate.
Understanding Isuzu Dashboard Warning Lights
Isuzu vehicles are equipped with an advanced diagnostic system that monitors various components and systems. When an issue is detected, a corresponding warning light will illuminate on your dashboard.
These warning lights are color-coded to indicate the severity of the issue:
- Red: Indicates a serious issue that requires immediate attention. You should stop driving as soon as it's safe to do so.
- Amber/Yellow: Suggests a less urgent problem that should be checked soon, but doesn't require immediate action.
- Green: Usually informational, indicating that a system is active or functioning normally.
- Blue: Usually informational, indicating features like high beam headlights or coolant temperature.
- White: Usually informational, indicating that certain systems or features are currently active.
Below you'll find a comprehensive list of warning lights that may appear on your Isuzu vehicle's dashboard.
Isuzu Warning Light Categories
Critical Warning Lights
These red warning lights indicate serious issues that require immediate attention.
Service Warning Lights
These amber/yellow lights suggest issues that need attention soon but aren't immediately critical.
Information Indicators (Green)
These green lights simply inform you that certain systems are active.
Information Indicators (White)
These white lights provide status information about various vehicle systems.
Critical Warning Lights
Air Pressure Warning Light
This warning light should normally come on when the starter switch is turned to the “ON” position, and then should go out after the engine has started. This warning light comes on and a buzzer sounds if air pressure drops below the specified level. Immediately pull off to a safe place, check the vehicle and take necessary actions.
Anti-theft System Indicator Light
This indicator light comes on or flashes when the anti-theft system starts operating.
Automatic Transmission Fluid Temperature
This warning light comes on when the temperature of the automatic transmission becomes high while driving.
Brake Booster Warning Light
The warning light and buzzer will come on simultaneously whenever: ● The brake booster’s vacuum becomes insufficient, either during driving or when the starter switch is in the “ON” position. ● There is an abnormality in the charging system (such as a generator malfunction or either loosening or splitting of the fan belt, etc.). ● The hydraulic brake booster (HBB) system becomes faulty. ● If your vehicle is equipped with an exhaust brake, a problem occurs with the exhaust brake while it is being used. (The warning buzzer will stop sounding when the parking brake is engaged.) If this happens while driving: ● Do not pump the brakes. The system is designed to stop the truck with a reserve power assist if the pedal is held down. This reserve is greatly reduced each time you apply and release the brakes. ● Stopping distance may be longer. ● You may have to push much harder on the brake pedal. Have the vehicle repaired before you continue driving. The buzzer stops when the parking brake lever is pulled up.
Brake System Warning Light
This warning light should come on when the starter switch is turned to the “ON” position, and then should go out after the engine is started. The brake system warning light comes on while the engine is running (after startup) in the following situations: ● Drop in the level of brake fluid (due to brake wear or fluid leakage, etc.) ● Abnormality in the charging system (such as a generator malfunction or either loosening or splitting of the fan belt, etc.) ● On an anti-lock brake system (ABS) model, abnormality in the ABS (the ABS warning light will also come on.)
Check 4WD Warning Light
When this warning light stays on, the 4WD system has a malfunction. Please contact the nearest Isuzu Dealer. If the CHECK 4WD warning light does not go out, or comes on repeatedly, have the inspected/serviced at the nearest Isuzu Dealer as soon as possible.
Door Open Warning Light
The door open warning light comes on if any door is not fully closed when the power mode is switched to “ON” (models with passive entry and start system) or the starter switch is turned to the “ON” position (models without passive entry and start system). For models with MID, this message appears on the display at the same time.
Engine Oil Pressure Warning Light
This warning light should come on when the starter switch is turned to the “ON” position, and then should go out after the engine is started. While the engine is running, this warning light comes on if the engine oil pressure, which lubricates the engine components, is abnormal. For 4JJ1 or 4HK1 engine models equipped with an engine oil level sensor, this warning light comes on when the engine oil level is too low. ● If this warning light comes on while the engine is running, immediately pull off to a safe place well clear of traffic. Stop the engine immediately and check the engine oil level. ● The lubrication system may be faulty. Promptly have your vehicle inspected at the nearest Isuzu Dealer.
Engine Overheat Warning Light
This warning light comes on when the engine has overheated. When the engine overheats, the engine coolant temperature gauge needle reaches the red zone, and the engine overheat warning light comes on, and at the same time a buzzer sounds. Immediately pull off to a safe place, check the vehicle, and take necessary actions. ● When the engine coolant is still hot, do not remove the radiator cap. Hot vapor will come out and you may be scalded. Add engine coolant only when the engine coolant temperature has dropped. ● If you continue to drive the vehicle with the engine overheat warning light on steady, the engine may seize up. ● Do not shut down an overheating engine immediately. Otherwise, the engine may seize up. Take appropriate actions for engine overheating.
Generator Warning Light
This warning light should come on when the starter switch is turned to the “ON” position and then should go out after the engine is started. This warning light comes on when, while the engine is running, there is a problem with the charging system (such as a loose or broken fan belt). If this warning light comes on while the engine is running, immediately pull off to a safe place well clear of traffic and promptly contact the nearest Isuzu Dealer for inspection.
Key Monitor Warning Light
This warning light comes on when there are abnormalities in the passive entry and start system, power management system, or steering wheel lock system.
PTO Indicator Light
This indicator light comes on when the dump control or power take-off (PTO) lever is operated, or when the PTO switch is pressed.
Parking Brake Warning Light
This warning light comes on when the parking brake lever is pulled up. ● The illumination of the warning light does not necessarily ensure firm application of the parking brake. The parking brake lever must be sufficiently pulled up and locked. ● Be careful not to drive the vehicle with the parking brake lever still pulled up.
SRS Airbag Warning Light
This warning light comes on when the power mode is switched to “ON” (models with passive entry and start system) or the starter switch is turned to the “ON” position (models without passive entry and start system), and then goes out after approximately 6 seconds. If this warning light comes on, seat belts with pretensioners and airbags may not function properly in the event of a collision.
Seat Belt Warning Light
This warning light comes on when the driver is not wearing the seat belt while the starter switch is in the “ON” position. NOTE: This warning light goes out as soon as the driver buckles the seat belt.
Second Seat Belt Warning Light
This warning light comes on when the passenger is not wearing his/her seat belt while the power mode is “ON” (models with passive entry and start system) or the starter switch is in the “ON” position (models without passive entry and start system). When the vehicle speed exceeds approximately 20 km/h (12 MPH), this warning light flashes. At this time, the warning buzzer sounds for approximately 90 seconds.
Water Separator (Fuel Filter) Light
This warning light comes on when water in the water separator (fuel filter) needs draining. Drain water following the instructions in the “Draining Water from the Fuel Filter” and make sure the warning light goes out. If this warning light comes on while the engine is running, immediately drain water from the fuel filter. If you still continue driving with the warning light on, the fuel injection system may fail.
Service Warning Lights
ABS Warning Light
This warning light should come on when the starter switch is turned to the “ON” position and then should go out after approximately 3 seconds. If this warning light comes on while driving, immediately stop your vehicle at a safe place well clear of traffic and take the following actions. ● Stop the engine. ● Restart the engine. Check if the ABS warning light comes on and then goes out. If it does, there is no problem. The ABS operates normally. ● Move the vehicle slowly forward. Gradually increase the speed to 15 km/h (9 MPH). If the light goes off, the ABS is normal. If the indicator light does not come on or go out, or comes on repeatedly, have the vehicle inspected/serviced at the nearest Isuzu Dealer as soon as possible. Even if a problem has occurred in the ABS, the brakes will still work as normal brakes. In this case, the ABS has no influence on the operation of the brake system.
ASR Indicator Light
When the starter switch is turned to the “ON” position, the indicator light should come on and change color from amber to green before it goes out 3 seconds later. This indicator light comes on amber if there is a problem with the ASR or when you disengage the ASR using the ASR OFF switch.
Adblue Low Warning Light
This warning light comes on if you continue driving the vehicle without refilling the AdBlue® tank when it is empty.
Air Cleaner Indicator Light
This indicator light comes on when the air cleaner element requires cleaning.
BSM OFF Indicator Light
When the blind spot monitor (BSM) is turned off by using the user customization function on the MID, the BSM OFF indicator light on the instrument panel comes on. This indicator light also comes on in the following cases. ● When the BSM or RCTA is not available due to an abnormality in another device or system in the vehicle. ● When the BSM or RCTA temporarily stops because the temperature of the radar sensors is extremely high or low, the warning message (“Radar unavailable”) is displayed on the MID for approximately 5 seconds, and then this indicator light comes on. ● When the BSM or RCTA temporarily stops due to dirt on the radar sensors or other factors, the warning message (“Radar clean-up”) is displayed on the MID for approximately 5 seconds, and then this indicator light comes on. ● When the BSM or the RCTA has malfunctioned, the warning message (“Radar failure”) is displayed on the MID for approximately 5 seconds, and then this indicator light and the master warning light come on at the same time. In this case, contact the nearest Isuzu Dealer.
Check Engine Warning Light
This warning light should come on when the starter switch is turned to the “ON” position and then should go out after the engine is started and finishes with diagnostic. If this warning light comes on while the engine is running, this alerts you to a problem with the engine electronic control system. Avoid driving at high speeds and promptly have the vehicle inspected at the nearest Isuzu Dealer. If this warning light comes on either intermittently or continuously while driving, service is required. Even if the vehicle is drivable, and does not require towing, see your Isuzu Dealer as soon as possible for service of the system. Continued driving without having the system serviced could cause damage to the emission control system. It could also affect fuel economy and drivability.
Check Trans Warning Light
If this light flashes after the engine has started, there is something wrong with the transmission electronic control system.
DPD Poerator Regeneration Light
When the operator regeneration of DPD is requested, this indicator light flashes. When the operator regeneration starts, this indicator light changes from flashing to remaining on. When the operator regeneration is completed, this indicator light turns off.
ESC OFF Indicator Light
When the ESC is canceled by pressing the ESC OFF switch, the ESC OFF indicator light on the instrument panel comes on. This indicator light also comes on when the 4WD switch is set to 4L (4WD low). When the ESC OFF indicator light does any of the following, the function may be faulty. Please contact the nearest Isuzu Dealer. ● When the ESC OFF indicator light comes on during driving (when the ESC OFF switch is not operated). ● The ESC OFF indicator light does not turn on when the power mode is switched to “ON” (models with passive entry and start system) or the starter switch is turned to the “ON” position (models without passive entry and start system).
ESC Warning Light
This warning light comes on whenever there is a problem with the electronic stability control (ESC) and/or hill descent control. When the ESC is operating, this warning light flashes. This warning light also comes on when the 4WD switch is set to 4L (4WD low). This warning light will also flash when only the traction control system (TCS) function is operating inside the ESC system. When the ESC warning light does any of the following, the ESC may be faulty. Please contact the nearest Isuzu Dealer. ● When the ESC warning light remains on while driving. ● The ESC warning light does not come on when the power mode is switched to “ON” (models with passive entry and start system) or the starter switch is turned to the “ON” position (models without passive entry and start system).
Emergency Lane Keeping OFF
This indicator light comes on when the emergency lane keeping (ELK) system is off.
Engine Oil Deterioration Light
This warning light comes on when the amount of engine oil is abnormal or when the engine oil is degraded. This warning light may come on earlier than the Maintenance Schedule. If this warning light comes on, replace the engine oil and the engine oil filter immediately.
Fuel Filter Warning Light
This warning light comes on when the fuel filter element is clogged with dust and others. If this warning light comes on, have the vehicle inspected/serviced at your Isuzu Dealer as soon as possible.
Glow Plug Indicator Light
This indicator light comes on when the starter switch is turned to the “ON” position and goes out when preheating is completed. When the indicator light has gone out, the engine may be started.
Headlight Automatic Leveling Light
This warning light comes on when there is an abnormality in the headlight automatic leveling. Have your vehicle inspected at the nearest Isuzu Dealer.
Idling Stop System OFF Light
This indicator light comes on when the idling stop system is deactivated. This indicator light flashes in the following conditions. At this time, a warning buzzer (continuous beep) sounds and a message appears on the MID. These operations continue until the power mode is in “OFF” (models with passive entry and start system) the starter switch is set to the “LOCK” position (models without passive entry and start system), or the engine is started manually. ● If the engine hood is opened ● If an idling stop system or related system abnormality occurs When the idling stop system OFF indicator light does any of the following, the idling stop system or related system may be faulty. Please contact the nearest Isuzu Dealer. ● When the idling stop system OFF indicator light flashes when the warning buzzer is not sounding. ● When the idling stop system OFF indicator light remains on when the power mode is switched to “ON” (models with passive entry and start system) or the starter switch is turned to the “ON” position (models without passive entry and start system).
Led Headlight Warning Light
When there is an abnormality in the LED headlight system, the LED headlight warning light comes on after the warning message is displayed on the MID for approximately 5 seconds. Have your vehicle inspected at the nearest Isuzu Dealer.
Lane Departure Warning OFF
This indicator light comes on when the lane departure warning (LDW) system is off.
Low Fuel Warning Light
This warning light comes on when the fuel level in the tank becomes too low while the engine is running. ● If the low fuel warning light comes on, add fuel at the earliest possible time. ● If the vehicle runs out of fuel, an air bleeding procedure must be performed.
Master Warning Light
This warning light comes on when the warning light and indicator light on the instrument panel is abnormal. At this time, a warning message is displayed on the MID for approximately 5 seconds. If this warning light comes on, contact the nearest Isuzu Dealer. This warning light comes on together with the following indicator lights to alert you that there is a problem with the vehicle. ● BSM OFF indicator light ● Parking aid system OFF indicator light ● Autonomous emergency braking OFF indicator light ● Lane departure warning OFF indicator light ● Emergency lane keeping OFF indicator light
Parking Aid System OFF Light
When the parking aid system is turned off by pressing the parking aid system OFF switch, the parking aid system OFF indicator light on the instrument panel comes on. This indicator light also comes on in the following cases. ● When the parking aid system is not available due to an abnormality in another device or system in the vehicle. ● When the sonar sensor cannot operate normally due to noise or other factors and the parking aid system temporarily stops, the warning message (“Sonar unavailable”) is displayed on the MID for approximately 5 seconds, and then this indicator light comes on. ● When the parking aid system temporarily stops due to dirt on the sonar sensors or other factors, the warning message (“Sonar clean- up”) is displayed on the MID for approximately 5 seconds, and then this indicator light comes on. ● When the parking aid system has malfunctioned, the warning message (“Sonar failure”) is displayed on the MID for approximately 5 seconds, and then this indicator light and the master warning light come on at the same time. In this case, contact the nearest Isuzu Dealer.
Rear Differential Lock Failure Light
This warning light comes on when there are abnormalities in the rear differential lock system.
Rear Fog Light Indicator Light
This indicator light stays on while the rear fog light is on.
SVS Indicator Light
The SVS indicator light will come on when the starter switch is in the “ON” position and the engine is not started, to let you know the bulb is working. The indicator light will go off after the engine starts. If the indicator light comes on during operation, immediately contact the nearest Isuzu Dealer for inspection.
Steering System Failure Warning Light
This warning light comes on when there is an abnormality in the electric power steering system. If this warning light comes on, stop the vehicle in a safe place and restart the engine. If the warning light still comes on, have your vehicle inspected at the nearest Isuzu Dealer as soon as possible.
TCS OFF Indicator Light
When the TCS is canceled by pressing the ESC OFF switch, the TCS OFF indicator light on the instrument panel comes on. This indicator light also comes on when the 4WD switch is set to 4L (4WD low). When this indicator light does any of the following, the TCS function may be faulty. Please contact the nearest Isuzu Dealer. ● When the TCS OFF indicator light comes on during driving (when the ESC OFF switch is not operated). ● The TCS OFF indicator light does not turn on when the power mode is switched to “ON” (models with passive entry and start system) or the starter switch is turned to the “ON” position (models without passive entry and start system).
Urea SCR Failure Warning Light
This warning light comes on when there is an abnormality in the urea SCR system.
Water Separator Warning Light
When the water in the water separator needs draining, the water separator warning light comes on. Drain water following the instructions in the “Draining Water from the Fuel Filter” and make sure the warning light goes out.
Information Indicators (Green)
4WD Indicator Light
When the 4WD switch is used to select “4H (4WD high)” or “4L (4WD low)”, this indicator light comes on. Whenever you use the 4WD switch, check that the 4WD indicator light has come on or gone out as expected before driving.
4WD Low Indicator Light
When the 4WD switch is used to select “4L (4WD low)”, this indicator light comes on. Whenever you use the 4WD switch, check that the 4WD low indicator light has come on or gone out as expected before driving.
ASR Indicator Light
When the starter switch is turned to the “ON” position, the indicator light should come on and change color from amber to green before it goes out 3 seconds later. This indicator light stays on green while the anti-slip regulator (ASR) is in operation.
Adaptive Cruise Control Indicator
This indicator light comes on green when the adaptive cruise control activates. When the adaptive cruise control is canceled automatically by the system, this indicator light changes from green to white after “Cruise control canceled” is displayed on the MID for approximately 5 seconds.
Automatic High Beam Indicator Light
This indicator light comes on when the automatic high beam (AHB) activates.
Cruise Control Indicator Light
This indicator light comes on green when the cruise control set switch is pressed.
Exhaust Brake Indicator Light
This indicator light comes on when the exhaust brake switch is turned on. The exhaust brake indicator light flashes if there is a problem with the exhaust brake system. Have your vehicle inspected at the nearest Isuzu Dealer as soon as possible.
Front Fog Light Indicator Light
This indicator light remains on while the front fog lights are on.
Hill Descent Indicator Light
When the hill descent control switch is pressed and the hill descent control is activated, this indicator light will come on. When the hill descent control is operating, this indicator light flashes.
Idling Stop System Indicator Light
When the engine is stopped by the idling stop system, this indicator light comes on and it goes out after the engine is restarted. This indicator light flashes for a few seconds in the following conditions, and the system automatically restarts the engine. At this time, a warning buzzer (short repeated beeps) sounds and a message appears on the MID for a few seconds. ● If the driver-side door is opened ● If the driver-side seatbelt is unbuckled
Intelligent Speed Limiter Indicator
This indicator light comes on green when the intelligent speed limiter activates.
Light Position Indicator Light
This indicator light comes on when the light control switch is in the “AUTO” (with the headlights or taillights “ON”).
Manual Speed Limiter Indicator
This indicator light comes on green when the manual speed limiter activates.
Rear Differential Lock Indicator Light
This indicator light flashes when the rear differential lock switch “ON” and comes on when the rear differential lock is engaged. When the rear differential lock switch is turned off while this indicator light is on, the rear differential lock is disengaged and the indicator light turns off.
Turn Signal And Hazard Indicator – Left
This indicator light flashes when the turn signal switch is operated with the starter switch in the “ON” position. This light flashes when the hazard warning flasher switch is operated irrespective of the position of the starter switch.
Turn Signal And Hazard Indicator – Right
This indicator light flashes when the turn signal switch is operated with the starter switch in the “ON” position. This light flashes when the hazard warning flasher switch is operated irrespective of the position of the starter switch.
Information Indicators (White)
Adaptive Cruise Control Indicator Light
This indicator light comes on white when the adaptive cruise control is set.
Cruise Control Indicator Light
This indicator light comes on white when the cruise control main switch is pressed.
Intelligent Speed Limiter Indicator Light
This indicator light comes on white when the intelligent speed limiter is set.
Manual Speed Limiter Indicator Light
This indicator light comes on white when the manual speed limiter is set.