AutoCodes – GMC – P0091 2016 GMC Sierra

P0091 2016 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 2016 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 288

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 2016 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 2016 GMC Sierra - Fuel Pressure Regulator Control Circuit Low Voltage - AutoCodes.com — P0091 2016 GMC Sierra Code - Fuel Pressure Regulator Control Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0091 2016 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 2016 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 2016 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 2016 GMC Sierra Code

1. What are the common symptoms of OBDII code P0091 in a 2016 GMC Sierra?

The common symptoms of code P0091 include poor engine performance, rough idling, difficulty starting the vehicle, and decreased fuel efficiency.

2. What does the OBDII code P0091 Fuel Pressure Regulator Control Circuit Low Voltage mean for a 2016 GMC Sierra?

Code P0091 indicates that the Engine Control Module (ECM) has detected a low voltage condition in the fuel pressure regulator control circuit.

3. What are the possible causes of OBDII code P0091 in a 2016 GMC Sierra?

The possible causes of code P0091 include a faulty fuel pressure regulator, damaged wiring or connectors in the fuel pressure regulator circuit, a defective ECM, or a problem with the fuel pressure sensor.

4. How can I diagnose OBDII code P0091 in my 2016 GMC Sierra?

Diagnosing code P0091 involves using a scan tool to read the fault codes, checking the fuel pressure regulator and its circuit for any visible damage, and testing the fuel pressure sensor for proper function.

5. Can I still drive my 2016 GMC Sierra with OBDII code P0091?

It is not recommended to drive your vehicle with code P0091, as it can lead to further damage to the engine and fuel system. It's best to address the issue promptly to avoid potential safety hazards.

6. How can I repair OBDII code P0091 in my 2016 GMC Sierra?

Repairing code P0091 may involve replacing the fuel pressure regulator, repairing or replacing damaged wiring or connectors, resetting the ECM, or addressing any issues with the fuel pressure sensor.

7. Will resetting the ECM clear OBDII code P0091 in my 2016 GMC Sierra?

Resetting the ECM may temporarily clear the code, but if the underlying issue causing code P0091 is not addressed, the code is likely to return. It's important to diagnose and fix the root cause of the problem.

8. Is OBDII code P0091 in a 2016 GMC Sierra a serious issue?

Code P0091 can potentially cause engine performance issues and affect fuel efficiency. While it may not always result in immediate breakdown, it is essential to address this code promptly to prevent further damage to the vehicle.

9. Can a DIY enthusiast fix OBDII code P0091 in a 2016 GMC Sierra?

Depending on your skill level and access to tools, a DIY enthusiast may be able to diagnose and repair code P0091. However, if you are unsure or lack experience, it's best to seek help from a professional mechanic.

10. How much should I expect to pay for repairing OBDII code P0091 in my 2016 GMC Sierra?

The cost of repairing code P0091 can vary depending on the underlying issue, parts needed for replacement, and labor costs. It's recommended to get a few quotes from different mechanics to compare prices.