AutoCodes – GMC – P0091 2017 GMC Sierra

P0091 2017 GMC Sierra Code - Fuel Pressure Regulator Control Circuit Low Voltage

Quick Answer

High-pressure fuel is regulated by the high-pressure fuel pump actuator, which is a part of the high-pressure fuel pump. Common causes include Faulty High-Pressure Fuel Pump, High-Pressure Fuel Pump harness is open or shorted, High-Pressure Fuel Pump electrical circuit poor connection. 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: P0091 2017 GMC Sierra indicates Fuel Pressure Regulator Control Circuit Low Voltage.
Common causes: Common causes include Faulty High-Pressure Fuel Pump, High-Pressure Fuel Pump harness is open or shorted, High-Pressure Fuel Pump electrical circuit poor connection.
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 507

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 May 16, 2022

Description
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code P0091 2017 GMC Sierra Description

High-pressure fuel is regulated by the high-pressure fuel pump actuator, which is a part of the high-pressure fuel pump. The high-pressure fuel pump actuator is a solenoid valve. The Engine Control Module (ECM) provides battery voltage on the actuator high control circuit and ground on the actuator low control circuit. Both circuits are controlled through output drivers within the ECM. When deactivated, both drivers are disabled. When activated, the high control circuit driver energizes the high-pressure fuel pump actuator, and the low control circuit driver Pulse-Width Modulates (PWM) the low control circuit to the ground. The ECM monitors the voltage on the circuits to detect a failure. The Diagnostic Trouble Code (DTC) will set if the ECM detects a short to ground in the high-pressure fuel pump actuator low control circuit.

OBDII Code P0091 2017 GMC Sierra - Fuel Pressure Regulator Control Circuit Low Voltage - AutoCodes.com — P0091 2017 GMC Sierra Code - Fuel Pressure Regulator Control Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0091 2017 GMC Sierra?

Faulty High-Pressure Fuel Pump
High-Pressure Fuel Pump harness is open or shorted
High-Pressure Fuel Pump electrical circuit poor connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P0091 2017 GMC Sierra?

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 does this mean?

Code Tech Notes

User Submitted Video

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0091 2017 GMC Sierra 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.

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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.

Frequently Asked Questions about P0091 2017 GMC Sierra Code

What does the OBDII code P0091 mean on a 2017 GMC Sierra?

P0091 indicates a low voltage issue in the fuel pressure regulator control circuit, which affects the vehicle's ability to regulate fuel pressure properly.

What are common symptoms of the P0091 code in a 2017 GMC Sierra?

Symptoms include poor engine performance, hard starting, reduced fuel efficiency, stalling, and the Check Engine Light turning on.

What causes the P0091 code to appear in a 2017 GMC Sierra?

Common causes include a faulty fuel pressure regulator, damaged wiring or connectors in the control circuit, a malfunctioning fuel pump, or a failed powertrain control module (PCM).

Can I drive my 2017 GMC Sierra with a P0091 code?

Driving with a P0091 code is not recommended as it can lead to poor performance, potential stalling, and further damage to the fuel system.

How do I diagnose the P0091 code on my GMC Sierra?

Diagnosis involves inspecting the wiring and connectors for damage, testing the fuel pressure regulator, checking the circuit voltage, and verifying the PCM functionality using a scan tool.

How do I fix the P0091 code on a 2017 GMC Sierra?

Repairs may include replacing the fuel pressure regulator, repairing damaged wiring or connectors, replacing a faulty fuel pump, or reprogramming or replacing the PCM if necessary.

What tools are needed to troubleshoot a P0091 code?

Youâ€™ll need an OBDII scanner, a multimeter for voltage testing, and possibly a fuel pressure gauge to check the fuel system's performance.

Can a dirty fuel filter cause the P0091 code?

While a dirty fuel filter can restrict fuel flow, it is not a direct cause of the P0091 code, which specifically relates to a low voltage issue in the fuel pressure regulator circuit.

How much does it cost to repair a P0091 code on a 2017 GMC Sierra?

Repair costs vary depending on the issue. Replacing a fuel pressure regulator typically costs $200-$400, while wiring repairs or PCM replacement can cost more.

Will clearing the P0091 code with a scanner fix the issue?

Clearing the code may temporarily remove the Check Engine Light, but the underlying problem must be diagnosed and repaired to prevent the code from returning.