P0087: Fuel Rail/System Pressure - Too Low

What does P0087 mean?

Engines with a fuel rail pressure sensor report the actual pressure to the ECM, which compares it with the target. When pressure stays too low, it stores P0087.

Low fuel pressure means the injectors cannot deliver enough fuel, especially at high rpm and load. That is why symptoms often appear when accelerating hard or climbing.

Common symptoms

• Check engine light on
• Lack of power, especially at higher rpm or load
• Misfires or hesitation
• Stalling in some cases

Common causes

The causes below are the ones commonly seen with P0087. The actual cause can vary by vehicle, engine and mileage, so treat this list as a starting point, not a diagnosis.

• A weak or failing fuel pump
• A fault in fuel pump control or pressure regulation
• A faulty fuel pressure sensor or wiring problem

What to check with a scanner

• In Live data, compare fuel rail pressure with the specified value at idle and under load, if your vehicle reports it.
• Check freeze frame data to see the rpm and load when the code set.
• Confirm the tank has a reasonable amount of fuel.
• A mechanical pressure gauge test is the reliable way to confirm a real pressure problem before replacing parts.

How to read and clear P0087 with OBD Master Pro

1. Plug in your adapter. Connect a generic ELM327 (or ELM329) OBD2 adapter to the diagnostic port, usually under the dashboard on the driver's side. Bluetooth Classic, Bluetooth LE, Wi-Fi and USB OTG adapters are supported.
2. Switch the ignition on. Turn the key to ON or start the engine, depending on your car.
3. Connect in OBD Master Pro. Open the app, go to Connection and pick your adapter. Classic Bluetooth adapters connect from the Bluetooth tab, Bluetooth LE adapters from the BLE tab with no pairing needed. Use the generic OBD2 / EOBD profile or your car's brand profile.
4. Read the codes. Open the fault codes screen to see stored, pending and permanent codes. Confirm P0087 is listed and note any other codes, since they often explain the cause.
5. Check the details. Look at freeze frame data, Live data and, where your car supports it, Mode 06 test results (see the checks above).
6. Fix, then clear. After the repair, clear the codes to turn off the check engine light. Clearing also resets the emissions readiness monitors, so drive normally and check the readiness screen before any inspection. Permanent codes cannot be erased with a scan tool; they clear on their own once the car's self test passes.

Tip: you can also look up P0087 and other codes in the app's DTC search without connecting to a car. If your adapter will not connect, use Connection > Share connection log and email it to support. Many cheap ELM327 clones only handle basic engine OBD2, which is all you need for P0087.

When to see a mechanic

Get professional help if any of these apply:

• The car stalls or loses power under load
• You smell fuel or see a leak (stop driving)
• Fuel pressure needs to be measured with a gauge

If you are unsure, a qualified technician can confirm the cause with tests such as smoke testing, pressure testing or scope readings. Clearing a code does not repair the fault.

Related trouble codes

See all OBD2 trouble code guides

Related guides

Check engine light on: what to do · How to read an OBD2 code (P, B, C, U) · Stored, pending and permanent codes and freeze frame · OBD2 readiness monitors explained · OBD2 glossary · OBD2 by car brand