P0087 — Fuel Rail/System Pressure Too Low — 6.7 Powerstroke
Diagnostic reference for P0087 on 6.7 Powerstroke (2011–present). Focuses on diagnosing low rail pressure causes without step-by-step repair of safety-critical…
What it means
Measured fuel rail pressure is below the PCM’s commanded value.1
Most likely causes
- High-pressure (CP4) pump wear or failure — Typical on this platform: associated with high-pressure (CP4) pump wear or failure.1
- Leaking pressure control/spill valve — Typical on this platform: associated with a leaking pressure control/spill valve.1
- Restricted fuel filter/supply — Typical on this platform: associated with a restricted fuel filter/supply.1
- Low-side supply pressure deficiency — Low-side (supply) fuel pressure below expected can contribute to rail pressure shortfall; P008A points at frame-mounted fuel pump module, clogged filters, or supply-line restriction.2
How to diagnose
- Verify freeze-frame conditions and repeat the fault under controlled load.
- Compare commanded vs actual rail pressure with a scan tool; confirm P0087 sets when measured pressure is below commanded.
- Inspect low-side supply pressure health; low supply can starve the high-pressure pump. P008A indicates low pressure fuel system pressure too low, typical causes include frame-mounted fuel pump module, clogged filters, or supply-line restriction.
- Check recent fuel filter service history and fuel quality; a restricted filter/supply is a typical cause on this platform.
- Assess high-pressure pump health indicators (noise, metal debris in fuel, historical pump failure reports). Typical on this platform: high-pressure (CP4) pump wear or failure is associated with P0087.
- Evaluate pressure control/spill valve operation via scan data and leak tests; a leaking pressure control/spill valve is a typical cause.
- Inspect rail pressure sensor and wiring for plausibility; sensor faults can mimic pressure issues. Related pressure faults on this platform include P0088 often linked to fuel pressure control valve or rail pressure sensor fault.
Common mistake to avoid
Replacing only the high-pressure pump after a CP4 failure. A failed CP4 can send metal through the injectors, lines and tank; check the fuel and filters for debris first, because a contaminated system needs more than a pump. Source: DieselHub — common 6.7 Power Stroke problems.
Parts and tools you may need
- Scan tool with live rail pressure commanded vs actual
- Fuel pressure test kit for low-side supply
- Digital multimeter
- Inspection light and borescope
Tools you’ll need
- OBD-II scan tool — Read live commanded vs actual rail pressure and freeze-frame data to confirm P0087 under load.
- fuel pressure gauge — Measure low-side supply pressure to rule out starvation of the CP4 high-pressure pump.
- digital multimeter — Check rail pressure sensor voltage and wiring integrity to eliminate sensor faults mimicking low pressure.
- fuel pressure test kit — Perform leak-down and spill-valve tests on the high-pressure system to assess CP4 health and pressure control.
Rough cost and difficulty
| Likely repair | Parts | Shop labor | Who usually does it |
|---|---|---|---|
| Fuel filter service | $30–$150 | 0.3–1 hrs | Easy DIY |
| Fuel pressure control valve (FCA/regulator) | $100–$400 | 0.5–2 hrs | DIY with tools and a manual |
| Lift pump / fuel transfer pump | $100–$400 | 1–3 hrs | DIY with tools and a manual |
| CP4.2 high-pressure fuel pump | $1,000–$2,000 | 4–8 hrs | Shop |
Typical US independent-shop figures; labor runs about $120–$180 per hour (dealers charge more). Confirm the diagnosis before buying parts.
When to see a pro
If metal contamination is suspected, or high-pressure pump failure is indicated, stop diagnosis and have the fuel system professionally evaluated to avoid catastrophic engine damage. High-pressure fuel work is safety-critical. NHTSA reports document sudden shutdowns and high repair costs associated with fuel pump failures on this platform. NHTSA also documents instances of trucks shutting down instantly in traffic after sensor-related faults. Seek a qualified diesel technician. If the vehicle is used for emergency service and experiences limp/reduced power, document occurrences; NHTSA reports note repeated limp mode events with code P2201 in brush-pumper applications. Seek immediate professional diagnosis.
Check for recalls
Recalls are tied to your truck’s VIN, so check yours directly: enter the VIN at NHTSA’s recall lookup. Open safety recalls are repaired free at a dealer.
Sources
Repair videos: P0087 on the 6.7 Power Stroke
Third-party videos, not ours — picked for this engine. Confirm anything against the factory service information for your truck.
Spotted an error, or something missing? Tell us
Run a 6.7 Powerstroke? This goes straight to the editor — it is not published.