AutoCodes – GMC – P0087 GMC

P0087 GMC Code - Fuel Rail Low Pressure

Quick Answer

The Engine Control Module (ECM) uses the Fuel Rail Pressure (FRP) Sensor to determine fuel pressure to the fuel injectors. Common causes include Blocked Fuel Filter, Faulty Fuel Rail Pressure (FRP) Sensor, Fuel Rail Pressure Sensor harness is open or shorted. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means: P0087 GMC indicates Fuel Rail Low Pressure.
Common causes: Common causes include Blocked Fuel Filter, Faulty Fuel Rail Pressure (FRP) Sensor, Fuel Rail Pressure Sensor harness is open or shorted.
Severity: High - diagnose this code as soon as possible.
Can I drive?: Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

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Code Popularity 35,235

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

What is this?

Table of contents Created and updated by William Orellana on Jul 15, 2022

Description
Step-by-Step Diagnostic Guide
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P0087 GMC Description

The Engine Control Module (ECM) uses the Fuel Rail Pressure (FRP) Sensor to determine fuel pressure to the fuel injectors. This is then compared to the calculated target fuel pressure as determined by the ECM. The ECM adjusts the FRP by modulating the duty cycle of the control driver of the fuel pressure regulator. Injector pulse duration is determined by the measured rail pressure and the target injection fuel into each cylinder. If a sensor circuit malfunction is detected, or the commanded fuel injection pump flow is not within the proper range for a given engine load and speed, the Diagnostic Trouble Code (DTC) will be set.

OBDII Code P0087 GMC - Fuel Rail Low Pressure - AutoCodes.com — P0087 GMC Code - Fuel Rail Low Pressure

What does this mean?

What are the Possible Causes of the DTC P0087 GMC?

Blocked Fuel Filter
Faulty Fuel Rail Pressure (FRP) Sensor
Fuel Rail Pressure Sensor harness is open or shorted
Fuel Rail Pressure Sensor electrical circuit poor connection
Faulty Fuel Injector
Faulty Fuel Pump

How to Fix the DTC P0087 GMC?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0087 GMC code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

Need more information about the P0087 GMC code?

Need more information on how to fix the P0087 GMC code? Get Access to Factory Service Manuals

Need Help with the Code?

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Information for Specific GMC Models

P0087 2014 GMC Sierra — Fuel Rail Low Pressure
P0087 2015 GMC Sierra — Fuel Rail Low Pressure
P0087 2016 GMC Sierra — Fuel Rail Low Pressure
P0087 2017 GMC Sierra — Fuel Rail Low Pressure
P0087 2018 GMC Sierra — Fuel Rail Low Pressure

About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.