Powertrain, generic · Fuel and air metering, auxiliary emission controls

P0087 Fuel Rail/System Pressure - Too Low

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

On common-rail diesel and gasoline direct-injection engines, a high-pressure pump feeds the fuel rail, a sensor measures rail pressure, and the engine control module regulates it towards a target from its maps. P0087 is set when the actual pressure stays below the target by more than a threshold for some time. It is a system code: it does not say which component is at fault. Typical causes are a weak low-pressure supply, a worn high-pressure pump, a sticking control valve, a leak or a drifting pressure sensor; the engine usually goes into reduced power.

Likely causes

Low-pressure supply too weak: lift pump, clogged filter, low tank level or waxing
High-pressure pump worn
Pressure control or metering valve sticking
High-pressure leak or excessive injector return flow
Rail pressure sensor drifting

Symptoms

  • Check engine light on
  • Loss of power or reduced power mode
  • Hard starting or stalling
  • Jerking under load

Repair estimate

DifficultyHardWorkshop job
Parts and labour€50–2,500
Time0.5–4 h

Typical range across vehicles; the real cost depends on what the testing finds.

What to check first

  1. Check fuel filter service interval
  2. Measure low-side fuel pressure
  3. Compare rail pressure desired vs actual
  4. Look for leaks

Parts involved

high pressure fuel pumpfuel pressure regulatorrail pressure sensorlow pressure fuel pumpfuel filter

Related codes

P0088P0089P0090P0093P008AP0190P0001

References: law.cornell.edu, newtonnet.co.uk, gsi.ext.gm.com, saabwisonline.com.