AutoCodes – GMC – P0091 2014 GMC Sierra

P0091 2014 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 2014 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 309

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 2014 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 2014 GMC Sierra - Fuel Pressure Regulator Control Circuit Low Voltage - AutoCodes.com — P0091 2014 GMC Sierra Code - Fuel Pressure Regulator Control Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0091 2014 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 2014 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 2014 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.

Need more information about the P0091 2014 GMC Sierra code?

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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 2014 GMC Sierra Code

What does the OBDII code P0091 mean for a 2014 GMC Sierra?

Code P0091 indicates a low voltage issue in the fuel pressure regulator control circuit, which can affect fuel delivery to the engine.

What are the common symptoms of code P0091 in a 2014 GMC Sierra?

Symptoms may include poor engine performance, difficulty starting, reduced fuel efficiency, and sometimes a check engine light.

What causes the P0091 code on a 2014 GMC Sierra?

Possible causes include a faulty fuel pressure regulator, wiring issues, a bad PCM (Powertrain Control Module), or corroded electrical connections.

Can a dirty fuel filter trigger the P0091 code on a GMC Sierra?

While not a direct cause, a dirty fuel filter can create fuel delivery problems that may exacerbate issues related to the fuel pressure regulator.

How can I diagnose the P0091 code on my 2014 GMC Sierra?

Start by visually inspecting the wiring and connectors for damage, then use a multimeter to test the fuel pressure regulator control circuit for proper voltage.

Is it safe to drive with the P0091 code on a 2014 GMC Sierra?

Driving with this code may lead to reduced performance and potential engine damage. Itâ€™s best to address the issue promptly.

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

Repair costs can vary but may range from $150 to $500, depending on whether the fuel pressure regulator, wiring, or PCM needs replacement.

Can a faulty PCM cause the P0091 code on a 2014 GMC Sierra?

Yes, a malfunctioning PCM can send incorrect signals to the fuel pressure regulator, triggering this code.

What tools are needed to fix the P0091 code on a GMC Sierra?

Youâ€™ll typically need an OBDII scanner, multimeter, and basic automotive tools for inspecting and repairing electrical connections or replacing components.

Does the P0091 code affect fuel efficiency in a 2014 GMC Sierra?

Yes, this code can lead to poor fuel economy due to improper fuel pressure regulation.