2014 GMC Sierra 2500 HD Wiring Harnesses

Genuine GM wiring harnesses for the 2014 GMC Sierra 2500 HD, at wholesale prices. Harnesses carry the exact connectors and pinouts the modules expect, and they change with option content and build date. GMT900 HD through 2014, K2XX HD from 2015 to 2019, and the T1XX HD from 2020.

When to replace

Rodent damage, corrosion at a connector, or a repair after collision work. On a heavy duty pickup, cab configuration, drivetrain and box length all split this group, so the badge on the tailgate is not enough to order from.

Why order factory

• VIN verified fitment. We confirm the wiring harnesses number against your vehicle before it ships.
• Same day dispatch. Order wiring harnesses by mid-afternoon and it leaves our warehouse that day.
• Returns without a fight. We would rather fix a wiring harnesses order than argue about it.
• Covered by GM. On wiring harnesses that coverage is worth more than the price gap.
• Real wholesale. The same wiring harnesses your dealer sells, at a fraction over our cost.

Avoiding the wrong part

The factory number ties back to GM engineering records, which is something no aftermarket catalog can offer. Give us the number stamped on the old part and we will trace what it superseded to. Same day shipping on in stock items, direct from one of the largest GM parts warehouses in the country.