Hyundai Tucson Plug-in Hybrid Warning Lights: What They Mean

Red: stop or act now

Charging Cable Connection Indicator (Plug-in hybrid vehicle)

The charging cable is connected. PDF page 155

Amber: check soon

Intelligent Speed Limit Assist indicator light

Yellow when the system is disabled, the front view camera is blocked, or a malfunction is detected.
What to do: If it stays on after the camera is uncovered, have the vehicle inspected by an authorized HYUNDAI dealer. PDF page 163

Other warnings and indicators

Engine oil pressure warning light

Engine oil pressure is low. Continued driving may cause severe engine damage, and engine power may be limited.
What to do: Stop safely, turn off the engine, check the oil level and add oil. If the light stays on, have a dealer inspect it. PDF page 158

Parking brake warning light

Parking brake is applied. If it stays on after release with the engine running, the brake system may be malfunctioning.
What to do: Release the brake before driving. If the light stays on, stop driving if possible, or drive only to a safe location. PDF page 351

Regenerative brake warning light

Regenerative brake is not operating and braking is weaker due to a brake system malfunction. The pedal may feel deeper and stopping distance longer.
What to do: Have the vehicle inspected and repaired by an authorized HYUNDAI dealer. PDF page 45

Airbag warning light

Comes on for 3-6 seconds at start-up, or indicates a malfunction in the Safety Restraint System (SRS).
What to do: If it stays on while driving, have the vehicle inspected by an authorized HYUNDAI dealer. PDF page 155

Seat belt warning light

The driver's seat belt is not fastened.
What to do: Fasten the seat belt; see the Seat belts section in chapter 3. PDF page 155

Service warning light

Problem with the hybrid control system or hardware, or a malfunction of an actuator or the electric A/C compressor. Normally on about 3 seconds at start.
What to do: If it comes on while driving or stays on after starting, have the vehicle inspected by an authorized HYUNDAI dealer. PDF page 45

Motor Driven Power Steering (MDPS) warning light

Comes on for about 3 seconds at start-up, or when the power steering malfunctions.
What to do: If it stays on while driving, have the vehicle inspected by an authorized HYUNDAI dealer. PDF page 158

Low tire pressure warning light

One or more tires are significantly under-inflated. If it blinks then stays on, the TPMS has a malfunction.
What to do: For a TPMS malfunction, have the vehicle inspected by a dealer as soon as possible. PDF page 160

Electronic Parking Brake (EPB) warning light

Comes on for about 3 seconds at start-up, or when the EPB malfunctions. It may also light when ESC has a fault.
What to do: If it stays on while driving, have the vehicle inspected by an authorized HYUNDAI dealer. PDF page 160

Low fuel level warning light

The fuel tank is nearly empty. Driving on low fuel may cause misfire and damage the catalytic converter.
What to do: Refuel the vehicle as soon as possible. PDF page 158

Electronic Stability Control (ESC) indicator light

Comes on for about 3 seconds at start-up, or when ESC malfunctions. It blinks while ESC is operating.
What to do: If it indicates a malfunction, have the vehicle inspected by an authorized HYUNDAI dealer as soon as possible. PDF page 166

Immobilizer indicator light

Lit when the smart key is detected, so you can start the engine. Blinking means the key is absent or the immobilizer is malfunctioning.
What to do: If it blinks due to a malfunction, have the vehicle inspected by an authorized HYUNDAI dealer. PDF page 167

Turn signal indicator light

Blinks when the turn signal is operated. Staying lit, blinking rapidly or not lighting suggests a turn signal malfunction.
What to do: If any of these occur, have the vehicle inspected by an authorized HYUNDAI dealer. PDF page 167

Downhill Brake Control (DBC) indicator light

Green when the system is activated and blinking green when operating. Yellow means a DBC malfunction was detected.
What to do: If the yellow light stays on, have the vehicle inspected by an authorized HYUNDAI dealer. PDF page 166

Electronic Stability Control (ESC) OFF indicator light

Comes on for about 3 seconds at start-up, or when ESC is deactivated with the ESC OFF button. PDF page 166

EV mode indicator

The vehicle is being driven by the electric motor. PDF page 155

Speed Limiter indicator light

The speed limiter is enabled. PDF page 163

Low beam indicator light

The headlights are on. PDF page 167

Green: system on

Ready indicator

On means the vehicle is ready to drive. Off or blinking means normal driving is not possible or there is a system problem.
What to do: If it goes off or blinks, have the vehicle inspected by an authorized HYUNDAI dealer. PDF page 155

Lane Following Assist indicator light

Green when Lane Following Assist is operating, grey when conditions are not met, and blinking white when steering assist is cancelled. PDF page 163

Summarized in our own words from the 2026 Hyundai Tucson Plug-in Hybrid owner's manual (AI-assisted; every light name was matched against its cited page 2026-10-18). Your vehicle may not have every light, and other years can differ. A red warning that stays on usually means stop safely and check: your manual has the final word.