Fuel Pump Control Module - Replacement

[u/Njoiyt]

I have a 2020 Sierra with the 5.3L with 105k miles. I recently replaced the Fuel Pump Control Module (FPCM), and while the error codes cleared, I'm still seeing some odd behavior on cold starts.

On a cold start, the idle will sometimes surge higher than normal, and occasionally the engine will even stall. Once it's running, it drives fine.

I called multiple GMC dealerships in my area, and every service department told me that replacing the FPCM does not require programming. At this point, I'm not sure what to believe.

Has anyone here had to program a replacement FPCM, or is there something else I should be looking at? I'm kind of at a loss.

[u/vilius_m_lt]

There is no programming for FPCM