AutoCodes – GMC – P0090 GMC

P0090 GMC Code - Fuel Pressure Regulator Control Circuit

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: P0090 GMC indicates Fuel Pressure Regulator Control Circuit.
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 26,541

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 P0090 GMC 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 an open circuit in the high-pressure fuel pump actuator low control circuit.

OBDII Code P0090 GMC - Fuel Pressure Regulator Control Circuit - AutoCodes.com — P0090 GMC Code - Fuel Pressure Regulator Control Circuit

What does this mean?

What are the Possible Causes of the DTC P0090 GMC?

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 P0090 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 does this mean?

Code Tech Notes

User Submitted Video

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0090 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 P0090 GMC code?

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Information for Specific GMC Models

P0090 2014 GMC Sierra — Fuel Pressure Regulator Control Circuit
P0090 2015 GMC Sierra — Fuel Pressure Regulator Control Circuit
P0090 2016 GMC Sierra — Fuel Pressure Regulator Control Circuit
P0090 2017 GMC Sierra — Fuel Pressure Regulator Control Circuit
P0090 2018 GMC Sierra — Fuel Pressure Regulator Control Circuit

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 P0090 GMC Code

1. What are the common symptoms of OBDII code P0090 GMC (Fuel Pressure Regulator Control Circuit)?

- Common symptoms include poor engine performance, decreased fuel efficiency, rough idling, and stalling.

2. What could cause the OBDII code P0090 GMC to trigger?

- The code may be triggered by a faulty fuel pressure regulator, damaged wiring in the control circuit, or a problem with the engine control module (ECM).

3. How can I diagnose the OBDII code P0090 GMC?

- Diagnosis typically involves using a scan tool to retrieve the code, checking the fuel pressure regulator and related wiring for any visible damage, and testing the fuel pressure system.

4. What are some possible DIY repair tips for fixing the OBDII code P0090 GMC?

- DIY repair tips may include checking and repairing any damaged wiring in the control circuit, replacing the fuel pressure regulator if faulty, and clearing the code with a scan tool.

5. Is it safe to continue driving with the OBDII code P0090 GMC active?

- It is not recommended to drive with this code active as it can lead to further engine damage and potential safety hazards on the road.

6. Can a clogged fuel filter cause the OBDII code P0090 GMC to appear?

- Yes, a clogged fuel filter can cause pressure issues in the fuel system, which may trigger the P0090 code.

7. How much does it typically cost to repair the OBDII code P0090 GMC at a mechanic's shop?

- The cost of repair can vary depending on the specific issue, but it may range from $200 to $500 at a mechanic's shop.

8. Will disconnecting the battery reset the OBDII code P0090 GMC?

- Disconnecting the battery may reset the code temporarily, but it is recommended to diagnose and repair the underlying issue to prevent the code from reappearing.

9. Can extreme weather conditions affect the fuel pressure regulator and trigger the OBDII code P0090 GMC?

- Yes, extreme weather conditions can sometimes affect the performance of the fuel pressure regulator, leading to pressure control issues and triggering the code.

10. How often should the fuel pressure regulator be inspected to prevent the OBDII code P0090 GMC from occurring?

- It is recommended to have the fuel pressure regulator inspected during regular maintenance intervals or whenever you experience symptoms of fuel system problems to prevent the code from appearing.