AutoCodes – Chevrolet – P0091 2014 Chevrolet Silverado

P0091 2014 Chevrolet Silverado 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 Chevrolet Silverado 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 922

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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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 Chevrolet Silverado 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 Chevrolet Silverado - Fuel Pressure Regulator Control Circuit Low Voltage - AutoCodes.com — P0091 2014 Chevrolet Silverado Code - Fuel Pressure Regulator Control Circuit Low Voltage

What does this mean?

What are the Possible Causes of the DTC P0091 2014 Chevrolet Silverado?

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 Chevrolet Silverado?

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 Chevrolet Silverado 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 Chevrolet Silverado 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 Chevrolet Silverado Code

1. What does the OBDII code P0091 mean for a 2014 Chevrolet Silverado?

P0091 indicates a "Fuel Pressure Regulator Control Circuit Low Voltage," meaning the vehicle's engine control module (ECM) has detected a low voltage signal in the fuel pressure regulator control circuit.

2. What are the common symptoms of code P0091 in a 2014 Chevrolet Silverado?

Symptoms may include difficulty starting the engine, reduced engine performance, poor fuel economy, rough idling, and, in some cases, the engine stalling.

3. What causes the P0091 code to appear in a 2014 Chevrolet Silverado?

Common causes include a faulty fuel pressure regulator, a damaged or corroded electrical connector, wiring issues (such as shorts or open circuits), a malfunctioning ECM, or a failing fuel pump.

4. Can I drive my 2014 Chevrolet Silverado with a P0091 code?

It is not recommended to drive with a P0091 code, as it can lead to poor engine performance, potential stalling, or further damage to the fuel system components.

5. How do I diagnose the P0091 code on my 2014 Chevrolet Silverado?

Start by inspecting the fuel pressure regulator and its wiring for damage or corrosion. Use a multimeter to check for proper voltage and continuity in the circuit. If no issues are found, test the fuel pump and ECM.

6. What repairs are commonly needed to fix the P0091 code?

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

7. Can a clogged fuel filter cause a P0091 code?

While a clogged fuel filter might affect fuel pressure, it typically wouldn't cause a low voltage signal in the regulator circuit. However, itâ€™s still a good idea to check the fuel filter as part of the diagnosis.

8. How much does it cost to repair a P0091 code on a 2014 Chevrolet Silverado?

The cost can vary depending on the exact cause. Replacing a fuel pressure regulator typically costs $150â€“$400, while wiring repairs or ECM replacement could increase the expense.

9. How do I test the fuel pressure regulator on my 2014 Chevrolet Silverado?

Use a fuel pressure gauge to measure the fuel pressure and compare it to the manufacturerâ€™s specifications. Additionally, verify the voltage at the regulatorâ€™s electrical connector with a multimeter.

10. Can a weak battery trigger a P0091 code?

Yes, a weak or failing battery can cause low voltage in the fuel pressure regulator circuit, potentially triggering the P0091 code. Always check the battery and charging system during diagnosis.