okoilman

I have a 2020 6.6 gasser and at 61k miles I started getting a P018b Fuel pressure sensor b circuit range/performance, also P0446 Evap emission system vent control circuit, also P2635 Fuel pump a low flow/ performance. I resolved the Evap code by blowing a ton of dirt out of the charcoal canister(I work in oilfield, pretty dusty environment). At idle fuel pressure shows to be 38 ish pounds, under load drops to 28 ish and then comes back up. Rail pressure seems to follow the commanded pressure pretty decent, but low side fuel pressure sensor while showing the 38 pounds shows 0v and it never changes. Took to dealer twice to be checked out and both times I was not able to get it looked at by a tech for various reasons.

I’m having same problems. 2020 2500 HD Custom. So far truck runs fine, just sends codes like crazy. Po121 Throttle/pedal position range perf P018b Fuel pressure Sensor B Circuit range performance P2635 Fuel pump A low flow Performamce It was giving me evap codes but I blew out charcoal canister out and stopped that. Fuel pressure is 38-40 at idle and low 30’s Under some load driving. I suspecting fuel pump getting weak on mine. Just hope I can find one. Local parts stores just laugh.