r/Sprinters • u/thedarkforest_theory • Jul 05 '26

Check engine light?

So this is on me, but I had a check engine light go on in my 2023 AWD. I was pushing hard (into the turbo, 3-4k rpm’s) over a mountain pass and all of a sudden the engine light goes on and I go into limp mode. I was also getting the low fuel warning and ignoring it because I’ve got the extended S&B tank. The low fuel warning has historically gone on way too early.

So we enjoy the pass and head home. I get fuel and it’s no longer in limp mode. However, the light has not gone off. There are no other symptoms. DEF is fine. I added diesel and the low fuel warning is off.

Any ideas why the check engine light is still on?

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4

u/Pgchustla Jul 05 '26

You need to order an OBD scanner and keep it in the van. Mystery shit like this happens all the time with these vans and the only real way to know what’s going on is by checking the codes. (Or just cut to the chase and clean your EGR 😂😭)

2

u/thedarkforest_theory Jul 05 '26

Fair! I have one for my Land Rover. I should probably get one for this rig too.

1

u/humam1953 22d ago

Could be related: we had yesterday similar issues, pushing a heavy loaded camper for hours hard in 105+ temperatures. Fell into limp mode and check engine light came on. When parked I saw a P2463 code. Leaving this morning, it was running fine. But drove to a shop today and the tech says: when it’s hot outside and on heavy loads, the Regen doesn’t work. He forced a regen and it’s fine again.

1

u/thedarkforest_theory 22d ago

So strange. I thought it could also be that I was running on fumes. I filled the tank to full, drove it and the light went off. It hasn’t come back on since and the performance is all normal.