Hyundai i30 Start Stop Deactivated / Not Working

The Hyundai i30 ISG (Idle Stop and Go) system is intended to help reduce fuel consumption and exhaust emissions by automatically shutting off the engine when the vehicle comes to a standstill. The engine is then automatically started when the driver moves off. To ensure engine stop mode activates:

Manual Gearbox

Hyundai i30 Automatic Engine Stop Start (Idle Stop and Go) Green Light — Hyundai i30 Auto Stop Indicator Light

For Hyundai i30 manual versions:

Slow to a speed of 3 mph (5 km/h)
Select neutral on the gear lever
When the engine stops, the green engine start stop light illuminates

Note: A driving speed of at least 6 mph (10 km/h) must be reached after an automatic stop in order to stop the engine in idle stop mode again.

Dual Clutch (Automatic) Gearbox

For Hyundai i30 automatic versions:

Slow to a speed of 0 km/h
Press the brake pedal and keep it pressed with the shift lever in ‘D’ (drive) or ‘N’ (neutral)
When the engine stops, the green engine start stop light illuminates

Note: A driving speed of at least 5 mph (8 km/h) must be reached after an automatic stop in order to stop the engine in idle stop mode again.

Prerequisite for Start Stop Activation

Certain conditions must first be met in order for the Idle Stop and Go system to work. If your Hyundai i30 automatic engine start stop system is not working or has been deactivated, it may be due to a fault, though more likely it’s due to a prerequisite not being met. The Idle Stop and Go system will work under the following conditions:

Hyundai i30 Automatic Engine Stop Start (Idle Stop and Go) Yellow Light — Hyundai i30 Auto Stop Unsatisfactory Yellow Indicator Light

The driver’s seat belt is fastened.
The driver’s door is closed.
The bonnet / hood is properly closed.
The brake vacuum pressure is adequate. Vacuum pressure is required to assist the driver, increasing brake force when applying the brake pedal.
The battery is sufficiently charged. An insufficiently charged battery is a common reason for engine start stop systems to not function. In many vehicles, if the battery state of charge is below 75%, engine stop will be inhibited.
The outside temperature is between -10 °C and 35 °C (14 °F and 95 °F).
The engine coolant temperature is not too low. In many vehicles, engine start stop will become deactivated if coolant temperature is below 10 °C.
The system is not in the diagnostic mode.
The steering wheel is not steered excessively. (for dual clutch transmission vehicle).
The vehicle is not driven on a steep incline. (for dual clutch transmission vehicle).

Other conditions that may influence or inhibit engine auto stop are:

Fuel temperature.
DPF regeneration (diesel particulate filter).

Automatic Engine Restart

In this situation, it’s where the engine unexpectedly restarts from idle stop mode. The green start stop warning light flashes for 5 seconds and a message ‘Auto Start’ appears on the driver’s display. The following conditions are:

The manual climate control system fan speed is set above the 3rd position, with the air conditioning system on.
The automatic climate control system fan speed is set above the 6th position, with the air conditioning system on.
With the air conditioning system on, after a certain period of time has elapsed, engine start takes place.
The defroster is switched on.
The brake vacuum pressure is low.
The battery charge is low.
For manual transmission vehicle, the driving speed exceeds 3 mph (5 km/h).
For dual clutch transmission vehicle, the driving speed exceeds 1.2 mph (2 km/h).
The vehicle gear lever is shifted to P (Park) or R (Reverse) when the brake pedal is depressed or the Auto Hold (if equipped with EPB) is activated.
The door is opened or seat belt is unfastened when the brake pedal is depressed or Auto Hold (if equipped with EPB) is activated.
If equipped, the electronic parking brake (EPB) is pressed when the Auto Hold is activated.