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Chevrolet Colorado Serpentine Accessory Belt Replacement Guide
How to change the serpentine accessory belt on a 3.6L V6 engine in a 2nd generation 2015 to 2022 GM Chevy Colorado.

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2019 Colorado 3.6L V6
Front Left - Alternator
Study Belt Routing
This automotive maintenance tutorial was specifically written to assist owners of the second generation (2015, 2016, 2017, 2018, 2019, 2020, 2021 and 2022) GM Chevrolet Colorado truck in changing the serpentine accessory belt on the LFX or LGZ 3.6 liter V6 engine. The procedure should be the same or very similar for the Ecotec 2.5L turbocharged I4 engine or the Duramax 2.8L turbodiesel I4 engine.

Owners of other General Motors vehicles from Chevrolet, GMC, Cadillac, Buick and Holden such as the Trax, Equinox, Traverse, Blazer, Tahoe, Suburban, Sonic, Cruze, Trailblazer, Spark, Malibu, Impala, Volt, Bolt, Corvette, Camaro, Silverado, Express, Regal, LaCrosse, Cascada, Encore, Enclave, Envision, Canyon, Sierra, Terrain, Acadia, Yukon, XT4, XT5, XT6, Escalade, CT5, CTS, XTS, CT6, ATS, Astra and Commodore may also find these DIY instructions to be helpful.

The compatible replacement part numbers for the 2015 and 2016 models with the LFX 3.6L V6 engine include the following: Bando 6PK1970, ACDelco 6K775 and Gates K060775.

The compatible replacement part number for the 2017, 2018, 2019 and probably the 2020 models with the LGZ version of the 3.6L V6 engine is the Dayco 5050745.

If you have the Ecotec 2.5L turbo I4 engine, the compatible part numbers are the ACDelco 5K689 and Dayco 5050689.

The tools needed to complete this procedure include a 15mm socket and a long handled 3/8" or 1/2" drive ratchet or breaker bar.

The first two steps are to open the hood and then locate the belt and pulleys on the front of the engine just behind the radiator.


Water (Coolant) Pump
Water Pump At Top
Small Idler Near Alternator
Take a few minutes to study how the OEM belt is routed around the water (coolant) pump, alternator, idler, tensioner, A/C (HVAC system) compressor and the crankshaft pulley.

There is a belt routing diagram in your owner's manual. I also created a belt routing diagram with the pulleys labeled which is located near the bottom of this page.

Crankshaft - Bottom
Tensioner Pulley
Attach Socket To Ratchet
The tensioner pulley and arm assembly are located near the top right (driver) side of the engine.

It is situated below the water pump and above the crankshaft pulley.

Attach the 15mm socket to a long handled 3/8" or 1/2" drive ratchet or breaker bar.

Attach Socket Tensioner
Rotate To Right / Down
Slide Belt Off Pulleys
Place the socket over the bolt head in the center of the tensioner pulley.

Carefully rotate the ratchet or wrench handle towards the right (driver) side (clockwise) and down towards the floor.

As your turn the ratchet to the right, the tensioner arm will rotate towards the left (passenger) side of the engine bay to release the tension on the old belt.

Carefully slip the old belt off the top of the water pump pulley or the alternator pulley.

Do NOT place your fingers in between the belt and any of the pulleys.

Remove the old belt from the other pulleys and lift it out of the engine bay.

(Note - If you the tensioner pulley does not spin freely, wobbles or makes noise, it should be replaced. To remove the tensioner pulley, loosen the bolt in the counterclockwise direction - lefty loosy.)

Old Belt Removed
GM 12677093
5PK 1890 SK612
The OEM (original equipment manufacturer) belt in this 2019 Colorado LT was marked as part number GM 12677093 and 5PK 1890 SK612 (or 5PK1890SK612).

Please verify the correct replacement belt for your truck by using the Amazon Part Finder website.

The correct belt part number will vary depending on the model year, trim level and engine.

Lower In New Belt
Belt Routing Diagram
Wrap Belt Around Pulleys
Carefully lower the new belt down into the front of the engine bay.

Examine the belt routing diagram located in the row of pictures above.

A good rule to remember is that the ribbed side of the belt should be wrapped around ribbed pulleys and the smooth side of the belt will be routed against the smooth pulleys.

Route the new belt around the crankshaft, A/C compressor, alternator and water pump pulleys.

Hold the last loop of the new belt near the tensioner pulley.

Use the 15mm socket to rotate the tensioner arm and carefully slip the new belt over the tensioner pulley.

The ratchet or breaker bar handle should be turned towards the right (driver) side of the engine bay and down to rotate the tensioner arm into position.

New Belt Installed
Double Check Routing
Start Engine - Listen
Double check that the new belt is properly routed around or against the various pulleys.

The belt should be fully seated into the ribbed pulleys with no part of the belt hanging over the edge of the pulley.

Start the engine and listen closely for any strange sounds which may indicate an improperly routed belt or a worn out pulley bearing.

If you do hear any strange noises, immediately turn off the engine and check the routing of the new belt.

Be sure to write down the belt change in your truck's service records.

The owner's manual specifies that the belt should be "visually inspected" every 150,000 miles and replaced every 10 years if their is fraying or other damage. I'd recommend changing the belt anywhere from every 60,000 miles if you are very cautious or at least every 80,000 to 100,000 miles depending on the physical condition of the belt and your unique driving conditions.

Please check out all of my 2015-2019 GM Chevrolet Colorado DIY Repair & Maintenance Guides.

If you found this guide to be helpful, please consider making a small donation by clicking on the "Donate" button located to the right of this paragraph. Thank you!
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