Chevrolet C-Series Pickup Automatic Transmission Indicator Bulb Size

Chevrolet C-Series Pickup automatic transmission indicator bulb uses 161 size. The replacement chart contains vehicle production years and bulb size specifications spanning 1993 to 1998.

The year-by-year compatibility chart below provides a quick reference to verify the correct bulb size for your vehicle.

Bulb Size by Year Range

Years	Bulb Type	Shop
1993-1998	161	Check Price

Bulb Specifications

Description	Type	Shop
ANSI standard (US & Canada). Miniature wedge bulb (T10). 12V, 1W.	161	Check Price

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Additional Notes

The Chevrolet C-Series Pickup uses the 161 bulb for the automatic transmission indicator across the 1993-1998 model years.
The 161 is an ANSI-standardized bulb recognized across the United States and Canada, meaning it conforms to a defined set of electrical and physical standards shared by multiple manufacturers.
It is a miniature wedge-type bulb, classified under the T10 designation. The T10 designation refers to a bulb body that is 10 eighths of an inch wide, and the wedge base design means the bulb is held in place by the socket gripping its base directly, with no separate metal cap or pins.
The 161 operates at 12 volts and draws 1 watt, placing it among the lower-output bulbs used in instrument panel applications where only a small amount of illumination is needed.
Because the wedge base is a friction-fit design, substituting a bulb with a physically different base type would result in an incompatible fitment, even if the voltage rating matched.
The 1-watt power draw means the bulb produces minimal heat during operation, which is consistent with its use in an enclosed instrument cluster environment.