EGR valve not responding
The ECM commanded a movement, the electrical side checks out, but the hardware did not move. This is a stuck or bound mechanism.
SPN 2791 — EGR valve not responding
SPN 2791 is the parameter the ECM is flagging on Volvo engines. The FMI that comes with it tells you how it failed. Each failure mode below has its own causes and its own test order — do not treat them as the same repair.
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Every SPN and FMI page on this site stays open — no account needed. Pro members can take the code into Blue Collar AI with the VIN, symptoms and photos, keep per-truck history, and print a work order. $14.99 a month or $99.99 a year.