GDP Commander T87A/T93 TCM Harness (2017-2023 GM Duramax L5P)

The GDP Commander T87A/T93 TCM Harness connects the GDP Commander to the transmission control module on 2017-2023 GM Duramax L5P trucks fitted with the T87A or T93 TCM.

Why it matters

• Flashes the TCM in the vehicle rather than removing it
• Covers both the T87A and T93 controllers
• Pairs with ECM tuning so engine and transmission calibrations match

Fitment

2017-2023 GM Duramax L5P 6.6L with the T87A or T93 transmission control module.

Device compatibility

Works with the GDP Commander, sold separately. For the ECM side, see the E41 ECM harness, part 541-03603.

GDP part 541-03602.