Need to reset LOW COOLANT light on 2000 Chevy Silverado 1500

Sensor in the fill tank is probably bad .
LOW COOLANT
The IPC illuminates the LOW COOLANT indicator in the message center when the IPC detects a low coolant level condition from the PCM. The IPC receives a class 2 message from the PCM indicating the coolant level.
Coolant Level Control (If Equipped)
The engine cooling system contains an engine coolant level switch to alert the driver in the event of a coolant loss. The powertrain control module (PCM) sends out a coolant loss signal over the coolant level switch signal circuit. When the engine coolant level switch reads a low coolant level in the fill tank, the switch opens. The message center receives its power from engine wiring harness junction block on the battery positive voltage circuit. Ground is provided by the ground circuits via the body wiring harness junction block and the engine wiring harness junction block. The cluster receives the class 2 message from the PCM indicating Low Coolant and displays the LOW COOLANT LEVEL message on the driver information center (DIC).

Is the fill tank full ?

Low coolant light came on--Holy ****! - 1999-2006 & 2007-2013 ...

www.gm-trucks.com/.../51843-low-coolant-light-came-on-holy-****/
Apr 22, 2006 - 13 posts - ‎10 authors I was driving down the freeway today and got a "low coolant" message. As you can ...Bob 2000 Ext cab Silverado 4x4 w/ 5.3. Back to top ... 2002 Silverado Battery light and low voltage on gauge ...
7 posts
Mar 19, 2013
Low coolant light - Ask the GM Technician - GM ...
14 posts
May 21, 2006
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Try unplugging the wiring to the sensor by the coolant unit...May just be corroded...Needs cleaning....

this might be important for you to know
Quote:

08-08-49-002: False Triggering of Low Coolant Level Warning Message (Reprogram HVAC Control Module) - (Feb 13, 2008)

Subject:
False Triggering Of Low Coolant Level Warning Message (Reprogram HVAC Control Module)

Models:
2007-2008 Chevrolet Silverado 2500 and 3500 Heavy Duty Series Only
2007-2008 GMC Sierra 2500 and 3500 Heavy Duty Series Only
with 6.6L Diesel Engine (VIN 6 -- RPO LMM)

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Condition
Some customers may comment that a "COOLANT LEVEL LOW ADD COOLANT" message is displayed in the Driver Information Center (DIC) even though the coolant level is normal.

Cause
This condition may be caused by a false reading during off-road driving or in high slush conditions.

Correction
Do This - Reprogram the HVAC control module.
Don't Do This - Do not replace the coolant level sensor, HVAC control module or radiator surge tank.


A revised calibration has been developed to address this condition. Technicians are to reprogram the Heating Ventilation and Air Conditioning (HVAC) control module with the latest software available on TIS2WEB. Refer to the Service Programming System procedures in SI. As always make sure your Tech 2 is updated with the latest software version.


Warranty Information
For vehicles repaired under warranty, use:
Labor: Operation D4707
Description: HVAC Control Head Module or Assembly Reprogramming with SPS
Labor Time: Use Published Labor Operation Time

You'll have to figure out if it is a fuel or ignition problem.
Is the check engine light on ?

Heater Core needs Checked or have the coolin system pressure checked

You can, but the factory recommends straight antifreeze so it can mix with the other coolant in the block.

Is the engine checked? Coolant and abs?

check level in your overflow bottle-check if sender not sludged and seized-check wires are connected properly

remove the belt,fan and pully their is a small hole in the bottom of the water pump you will be able too tell if its been leaking out of their, if so replace the waterpump