P1187 fault code: what it means

P1187: Diesel fuel pressure regulator valve stuck (CRDi).

Engine and gearbox (powertrain) · Costly if missed

Usual causes, most likely first

dirty or contaminated fuel sticking the regulator valve
faulty fuel pressure regulator valve
faulty rail pressure sensor

P1187 by make

Hyundai

Diesel fuel pressure regulator valve stuck (CRDi).

Usual causes: dirty or contaminated fuel sticking the regulator valve; faulty fuel pressure regulator valve; faulty rail pressure sensor

Kia

Diesel fuel pressure regulator valve sticking (CRDi).

Usual causes: debris or corrosion in the regulator valve; faulty fuel pressure regulator valve; faulty fuel pressure sensor

What the repair usually costs

CVT valve body replacement (remanufactured, in car)NZ$1,280–NZ$2,420 · A$1,200–A$2,400
High-pressure fuel pump (GDI petrol or common-rail diesel)NZ$1,140–NZ$4,280 · A$1,060–A$3,800

Not sure what P1187 means on your car? Ask Credov.

Before you clear it

Write the code down or photograph the scanner first. A code that comes straight back after clearing points to a fault that is still there. A car whose codes were cleared just before you arrived may be hiding one: the scanner's readiness monitors show "not ready" for a while after codes are cleared.

Researched by Credov from manufacturer and workshop sources. A fault code points to where a fault may be; a workshop confirms it with a diagnosis. Browse all fault codes.