Indicator/Warning Lights

Glow plug preheat indicator With the key in the ON position, the light will illuminate if glow plug heat is necessary as a starting aid. Wait until the light goes off before starting. The light should always illuminate briefly, when the ignition key is in the ON position. If the light does not illuminate, there may be a problem. After the engine starts, the light should remain off. The light should always illuminate at least momentarily when the engine is cold and the ignition is turned to ON. If it does not illuminate, the glow plug system should be checked and repaired promptly to avoid difficulty in cold starting.

Water in fuel During refueling, it is possible for water-contaminated diesel fuel to be pumped into your tank. Your vehicle fuel system is equipped with a fuel filter/water separator to remove water from the fuel. The WATER IN FUEL light will illuminate when the ignition is turned to START (as part of the light function check) and when the FCM/HFCM has a significant quantity of water in it. If the light illuminates when the engine is running, stop the vehicle as soon as safely possible, shut off the engine, then drain the FCM/HFCM. Refer to Draining the FCM/HFCM and changing the fuel filters in the Maintenance and Specifications section of this supplement for the drain procedure. Allowing water to stay in the system could result in extensive damage to, or failure of, the fuel injection system.

Do not drain the water separator while the engine is running. Fuel may ignite if the separator is drained while the engine is running or the vehicle is moving.

Engine air filter The engine air filter warning light illuminates when the air filter restriction gauge reaches the CHANGE FILTER mark. The condition should be verified by inspecting the underhood air filter restriction gauge; the warning light is only a secondary indicator. Always use the underhood air filter restriction gauge to determine when the air filter element needs to be changed. The vehicle may be driven with the engine air filter warning light illuminated/or when the underhood air filter restriction gauge has moved to the CHANGE FILTER mark for up to 400 km (250 miles) without damaging the engine or related components. However, the air filter element must be replaced at the earliest opportunity. Refer to Air filter restriction gauge (if equipped).

Transmission Tow/Haul Feature (5speed automatic transmission) (if equipped) Illuminates when the Tow/Haul feature has been selected. If the light flashes steadily or does not illuminate, have the transmission serviced soon, or damage may occur.