P0088
STOP
Rail pressure too high
The truck's control module (ECU) reports a fault on: Rail pressure too high.
P0088 means a truck control module (ECU) flagged a fault on rail pressure too high, part of the Fuel system on heavy-duty diesel trucks. DERATE rates it STOP: park safely and do not keep driving until it is checked. Part usually replaced: Fuel pressure regulator / relief valve, $150–$600 (aftermarket to dealer) plus 1–2.5 h labor.
Fuel
Can I keep driving?
No. Stop: park the truck in a safe place and do not keep driving until it is checked.
Part usually replaced
Fuel pressure regulator / relief valve
$150–$600 (aftermarket to dealer)
Labor: 1–2.5 h
USD, part only. Labor is billed at the shop's hourly rate.
Data: DERATE verified base, updated October 2026
Related codes
Read it off your own dash
Take one photo and DERATE tells you whether you can keep driving.
Ask DERATE
DERATE assists. It does not replace inspection by a qualified technician.