P0087 Fuel Rail/System Pressure Too Low — Causes & Fix

What Does P0087 Mean?

P0087 indicates the fuel rail pressure measured by the fuel rail pressure sensor is below what the ECU has commanded. The common rail system on diesel engines operates at extremely high pressures (250–2,000+ bar). When pressure drops below the required threshold, injection quality degrades, causing power loss, rough running, and potential stalling.

P0087 at a Glance

• What it means: The ECU has detected that fuel rail pressure is below the minimum threshold for the current operating conditions.
• Most common cause: Worn injectors leaking fuel back, failing high-pressure pump, or clogged fuel filter.
• Severity: Serious — engine may enter limp mode or stall under load.
• Can you drive?: Limited driving. Avoid heavy loads and motorway speeds. Risk of stalling.
• Typical repair cost: £30–£800 depending on the root cause.