2008 GMC Sierra 2500HD - limp mode mystery

Martyb02
Wed, 06 Jul 2022 15:46:04 +0000
Maintenance/Repairs

I have a 2008 GMC Sierra diesel and towing a 25 ft Airstream in a headwind. At 65 mph we’d go into limp mode but at 80 mph we were fine. We had one historical code for fuel pressure, but went into limp mode 4 times. What was the cause? We suspect a fuel pump issue. What do you think?

8 posts - 8 participants