GM Service Manual Online
For 1990-2009 cars only

One-to-Four Shift Light Manual Transmission


Object Number: 1430320  Size: A1

When this light comes on, the vehicle can only be shifted from 1 (First) to 4 (Fourth) instead of 1 (First) to 2 (Second).

The shift must be completed into 4 (Fourth) to turn off this feature. This helps the vehicle get the best possible fuel economy.

After shifting to 4 (Fourth), the vehicle can be downshifted to a lower gear.

Notice: Forcing the shift lever into any gear except 4 (Fourth) when the 1 TO 4 SHIFT light comes on may damage the transmission. Shift only from 1 (First) to 4 (Fourth) when the light comes on.

This light comes on when:

    • The engine coolant temperature is higher than 169°F (76°C),
    • The vehicle is going 15 to 19 mph (24 to 31 km/h) and
    • The vehicle 21 percent throttle or less.