Sierra 3.0 - DEF crawl mode

[Reid Houck]

Ok…so I have a 2020 GMC Sierra with the 3.0L, owned it since September 2020. 
 

I am doing a cross country military move and have approximately 18,000 miles on the vehicle. Have broke down THREE times now with a fault in the DEF system. This is my 8th night of being stranded from Utah to Colorado. 
 

The first two codes were P2382 and the third code is P2383.
 

Utah GM dealership replaced replaced the exhaust differential sensor. The Denver GM dealership has shot wires and tightened connections. Denver did a 90 mile test drive and couldn’t get it to duplicate after repair. I drove 18 miles from dealer and got the engine light and went into crawl mode. 
 

Symtoms:

- Check Engine Light

- Service Emmission System

- Engine cooling fans on full blow

- Rough idle +/- 400 RPM

 

Questions:

1. Has anyone dealt with this?

2. Has anyone had GM jump through their but to help someone stuck on a cross country move? 
3. Has anyone dealt with buy-back or lemon law? 
 

I honestly don’t trust this truck. 

Edited July 30, 2021 by Reid Houck

[Stephen Moreno]

I'm having the same symptoms minus the P2382 code. Did you ever get this resolved? 

[cadillac]

After the ecm and reductant operating system is discarded, the prkifur filter needs to be cleaned..we experienced this problem. We solve it without changing any parts..

[cadillac]

After ecm and reductant programming is done with ac delco tds, parkour regeneration cleaning will solve the problem. you can be sure.3.0 dumax diesel wehicle. p2382 and p2383 codes.

[cadillac]

The factory ecm program is faulty for these vehicles.. An updated program should be made with sps and gds2.. 3.0 duramax diesel 2019- 2021 sierra and silverado and cadillac escalade 

[Kyle37]

I have a 2021 Sierra 1500 AT4 with the 3.0, it was in the shop for 2 months. They replaced the exhaust system twice and the Nox sensors once. They released it after thier third attempt saying it was fixed. Unfortunately, the light came back on after 48 miles. The code is the same P2382. Sense it is still under warranty and GMC is screwing me around. I retained a lemon law firm probono. GMC is obligated to buy your truck back and compensate you for any collateral damages.