Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSCHEVROLET1994K 2500 SUBURBAN 4WD V8-350 5.7LREPAIR AND DIAGNOSISPOWERTRAIN MANAGEMENTCOMPUTERS AND CONTROL SYSTEMSSHIFT LIGHTDESCRIPTION AND OPERATION
1994 Chevrolet K 2500 Suburban 4WD V8-350 5.7L
Shift Light: Description and Operation
1994 Chevrolet K 2500 Suburban 4WD V8-350 5.7LSECTION Description and Operation
Purpose:
Most manual transmission vehicles under 8500 GVW have a shift light on the instrument panel.
The shift light is commonly used to achieve improved fuel economy, by prompting the driver when to upshift. Depending on the engine/transmission installed in the vehicle, the shift light can have the following characteristics:
- Indicates proper shift point for maximum fuel economy.
- Indicates engine over-speed.
- Shift light is inoperative.
Operation:
The light is controlled by the control module and is turned "ON" by grounding CKT 456.
The chart details normal shift light operation:
RENDER: 1.0x
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.