That fuel rail pressure sensor failure in Waco

My 2016 Cummins started bucking like a rodeo bull about 10 miles outside Waco last Thursday. I pulled over, checked the fuel filters, and they were clean, but the scan tool kept showing erratic rail pressure readings. Took me three hours of chasing grounds and wiring before I finally swapped the sensor, cost me $85 at the local parts house. Runs perfect now, but I still don't trust that sensor design. Has anyone else had these fail without throwing a hard code right away?

2 comments

2 Comments

michaelchen20d ago

Tbh did you watch the live data stream while it was bucking, or only after? I'm wondering if the sensor was sending garbage numbers the whole time or if it just went haywire under load.

elizabethtaylor18d ago

You caught me, I was only looking at it after the fact. But honestly the logs tell the story pretty clearly. The sensor was spitting out perfectly normal numbers right up until the load spiked, then it went completely nuts. If it was sending garbage the whole time, the baseline readings would've been all over the place too, and they weren't. So it's not like the thing was broken from the start, it just lost its mind under pressure. Which, fair enough, I've done the same thing during a deadline.