How do you reprogram your BCM on a 2006 Chevrolet Colorado

There isn't one. The function is done by the Body Control Module (BCM) along with lots of other functions.

Where is the turn signal relay on a 2006 Chevy Colorado?
The turn signal is controlled by the BCM (Body Control Module) that is located at the passenger side kick panel.
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Known issue

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Has to be programmed ,yes .
Body Control Module (BCM) Replacement
If the BCM is replaced, the following procedures must be performed in the subsequent order:
• BCM Reprogramming--Refer to Body Control Module (BCM) Programming/RPO Configuration in Computer/Integrating Systems for replacement, setup, and programming.
• Theft Learn--Refer to Programming Theft Deterrent System Components in Theft Deterrent.

A new body control module (BCM) must be programmed with the proper regular production option (RPO) configurations. The BCM stores the information regarding the vehicle options and if the BCM is not properly configured with the correct RPO codes, the BCM will not control all of the features properly. The Tech 2 software will automatically prompt you with the RPO available for the vehicle. Ensure that the following conditions exist in order to prepare for BCM programming:
• The battery is fully charged.
• The ignition switch is in the ON position.
• The data link connector (DLC) is accessible.
• All disconnected modules and devices are reconnected before programming.
To setup a new BCM, access the Vehicle Control Systems in Computer/Integrating Systems menu on the scan tool to program the BCM. Select Module Replacement/Setup and follow the instructions on the scan tool.
If the BCM fails to accept the program, perform the following steps:
• Inspect all BCM connections.
• Verify that the scan tool has the latest software version.

Check and or test fuel gauge sending unit and the gauge . Videos on youtube showing how to . Also i would have the vehicle checked for DTC's - diagnostic trouble codes . You may want to think about taking to a qualified repair shop .

Fuel Gage
The instrument panel cluster (IPC) displays the fuel level as determined by the engine control module (ECM). The IPC receives a serial data message from the BCM indicating the fuel level percent. The fuel gage defaults to empty if:
• The ECM detects a malfunction in the fuel level sensor circuit.
• The IPC detects a loss of serial data communications with the BCM.
• The BCM detects a loss of serial data communications with the ECM.

DTC P0461
The fuel level sender changes resistance based on fuel level. The powertrain control module (PCM) monitors the signal circuit of the fuel level sender in order to determine fuel level. When the fuel tank is full, the sender resistance is low and the PCM senses a low signal voltage. When the fuel tank is empty, the sender resistance is high and the PCM senses a high signal voltage. The PCM uses the signal circuit of the fuel level sender in order to calculate the total remaining fuel percent in the tank. The PCM sends the fuel level percent via the class 2 serial data circuit to the instrument cluster in order to control the fuel gage. The fuel level information is also used for misfire and evaporative emission (EVAP) diagnostics.

DTC P0462 Fuel Level Sensor Circuit Low Voltage
DTC P0463 Fuel Level Sensor Circuit High Voltage

seems like the ecm is working so you need to make sure that the transponder key gets reprogrammed to the anti theft module or bcm link your key may be at fault

Sounds like the BCM is either defective or needs reprogramming. Since you are combining 3 trucks, were all working well before they became parts vehicles? In a collision, the electric wiring to the BCM may have been smashed and with "crossed" wires may have been erased or shorted.

You would swap BCM's and use the driveable one to get to the Dealer for reprogramming or Autozone, Advace, or Oreilys for a free scan.

2006 colorado
Don't waste your money on unnecessary sources and unwanted repairs.
Get this manual online under $10-15 and get complete guide on whether to repair or not, service it, and how to repair etc

Hello. the hron is this vehicle is operated by the BCM. this really requires a scan tool to check out. to answer your question if you have acces to a scan tool, you shouls be able to check the horn system out

Take it back to the installer. Those vehicles need a Tech 2 dealer scan tool to have the remotes reprogrammed. Hopefully you took it to a dealer and they should repair it at no charge (if the parts are still under warranty)

dealer repair as it may be 1 of 3 things to be replaced:
1 - Body Control Module (BCM) 1 - Instrument Panel Cluster (IPC) 1 - Sensor Diagnostic Module (SDM)

If the BCM or SDM has to be replaced the dealer will have to reprogram them to match your vehicles specifications. The instrument panel can be replaced by the vehicle owner with a few turns of a screwdriver and such

Have him go to The Local Auto Parts Store and Purchase a Haynes or Chilton Book on this Truck. Costs 25.00 But, will tell you how to fix ANYTHING that goes Wrong. You can get them also at their Websites.