What are the symptoms of P0087?

Common symptoms include: Hard starting or long crank; Power loss / limp mode under load; Stalling; Rough running.

What causes a P0087 code?

The most common causes are: Restricted fuel filter; Weak lift/supply pump; Failing high-pressure (CP) pump; Leaking injector bleeding off pressure; Air in the fuel system.

How do you fix P0087?

Check and replace the fuel filter(s) and drain the water separator; Measure supply pressure to the high-pressure pump; Test for injector return (back-leak) flow; Inspect for air/fuel leaks before condemning the CP pump. Take this seriously. It can trigger a power derate or lead to damage if you keep driving — get it diagnosed promptly.

OBD-II Code Lookup

P0087Serious

Fuel Rail/System Pressure Too Low

Fuel system

The engine commanded a fuel rail pressure the system couldn't reach — actual pressure stayed below target. On a common-rail diesel that points at the fuel supply or high-pressure pump side.

Take this seriously. It can trigger a power derate or lead to damage if you keep driving — get it diagnosed promptly.

Common symptoms

Hard starting or long crank
Power loss / limp mode under load
Stalling
Rough running

Common causes

Restricted fuel filter
Weak lift/supply pump
Failing high-pressure (CP) pump
Leaking injector bleeding off pressure
Air in the fuel system

How it's diagnosed & fixed

Check and replace the fuel filter(s) and drain the water separator
Measure supply pressure to the high-pressure pump
Test for injector return (back-leak) flow
Inspect for air/fuel leaks before condemning the CP pump

Got P0087? Get it diagnosed.

A real technician can interpret P0087 in the context of your truck and symptoms — and tell you what's actually wrong before you buy parts.

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Related Fuel codes

P0088Fuel Rail/System Pressure Too High P0093Fuel System Large Leak Detected P1093Fuel Rail Pressure Low During Power Enrichment

Reference only. A trouble code names a symptom, not the failed part — always confirm with a live diagnosis before repairs. See our Knowledge Base for deeper guides.