Fuel & air metering · Powertrain · generic (SAE-defined)
P0087: Fuel Rail/System Pressure - Too Low
P0087 means the engine computer measured fuel rail or fuel system pressure below the level it is commanding, which can starve the engine of fuel.
Standard title per SAE J2012 / ISO 15031-6 · Updated 2026-11-07 · By CarWhere Research
How P0087 sets
The powertrain control module (PCM) reads a fuel rail pressure sensor and compares the actual pressure to its target. On direct-injection gasoline and common-rail diesel engines this is the high-pressure rail; on some port-injected systems it is the low-pressure supply. If actual pressure stays below the target by more than an allowed amount, P0087 sets. The limits differ by manufacturer and system design.
Common causes of P0087
Roughly most likely first; the actual cause depends on the vehicle and needs testing to confirm.
- Clogged fuel filter
- Weak in-tank fuel pump or low-pressure supply
- Worn high-pressure fuel pump on direct-injection or diesel engines
- Faulty fuel pressure regulator or control valve
- Restricted or leaking fuel line
- Faulty fuel rail pressure sensor
- Running very low on fuel
P0087 symptoms
- Check engine light on
- Loss of power under load
- Hesitation or surging
- Hard starting or stalling
- Reduced power mode on some vehicles
How P0087 is diagnosed
- Scan for codes and freeze frame; note load and rpm when it set
- Check fuel level and confirm correct fuel type
- Compare desired and actual fuel rail pressure in live data during a road test
- Measure low-side supply pressure with a gauge
- Inspect fuel filter, lines and connections for restrictions or leaks
- Test the fuel rail pressure sensor signal and the high-pressure pump control
Typical fixes for P0087
- Replace the fuel filter
- Replace the in-tank fuel pump
- Replace the high-pressure fuel pump
- Replace the fuel pressure regulator or control valve
- Replace the fuel rail pressure sensor
- Repair restricted or damaged fuel lines
Replace parts only after testing confirms the cause — a code names the circuit or condition that failed a check, not necessarily the faulty part. We don’t publish per-repair prices; for what households actually spend on upkeep, see car repair costs.
Manufacturer notes
Commonly reported on Ford Power Stroke and GM Duramax diesels, and on many direct-injection gasoline engines including Volkswagen/Audi TSI and Ford EcoBoost. Definitions can vary by manufacturer; check factory service information.
Related codes & warning lights
P0087 FAQ
What does code P0087 mean?
P0087 means the engine computer measured fuel rail or fuel system pressure below the level it is commanding, which can starve the engine of fuel. The standard definition is "Fuel Rail/System Pressure - Too Low."
Can I drive with a P0087 code?
Limit driving and get it checked promptly. Low fuel pressure can cause stalling, loss of power in traffic or a lean condition that damages the engine, especially on direct-injection and diesel engines.
Is P0087 common on diesel trucks?
Yes. Common-rail diesels run very high rail pressures, and clogged filters, air in the fuel or worn high-pressure pumps frequently trigger this code.
Can a bad fuel pressure sensor cause P0087?
Yes. If the sensor under-reports pressure, the PCM believes pressure is low even though it may be correct. Verifying with a mechanical gauge helps separate the two.
Keep researching
Engine guides by brand (known issues, specs)
More fuel & air metering codes
Sources
- SAE J2012 — Diagnostic Trouble Code Definitions (standard code titles)
- ISO 15031-6 — Road vehicles: communication between vehicle and external equipment for emissions-related diagnostics, Part 6: Diagnostic trouble code definitions
- U.S. EPA — Vehicle Emissions Inspection and Maintenance (I/M) programs
- U.S. EPA, 40 CFR 86.1806-17 — Federal onboard diagnostics requirements for light-duty vehicles
- California Air Resources Board — On-Board Diagnostic (OBD) Program
General information written by CarWhere Research, not a diagnosis of your vehicle. Manufacturers can add their own sub-definitions and test conditions; confirm with the factory service information for your year, make and model. Before paying for a repair, check NHTSA for open recalls and your warranty booklet: federal law requires an emissions warranty on major emission-control parts such as the catalytic converter and engine computer.