AutoCodes – GMC – P0190 GMC

P0190 GMC Code - Fuel Rail Pressure Sensor Circuit Malfunction

Quick Answer

The Fuel Rail Pressure (FRP) sensor has a 5-volt reference circuit, a signal circuit, and a low reference circuit. Common causes include Low or no fuel, Faulty Rail Pressure (FRP) Sensor, Faulty Rail Pressure (FRP) harness is open or shorted. 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: P0190 GMC indicates Fuel Rail Pressure Sensor Circuit Malfunction.
Common causes: Common causes include Low or no fuel, Faulty Rail Pressure (FRP) Sensor, Faulty Rail Pressure (FRP) harness is open or shorted.
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 2,752

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 Jun 14, 2020

Description
Possible Causes
How To Fix
Cost to Diagnose
Comments
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Code P0190 GMC Description

The Fuel Rail Pressure (FRP) sensor has a 5-volt reference circuit, a signal circuit, and a low reference circuit. The Engine Control Module (ECM) monitors the voltage on the FRP sensor circuits. When the fuel pressure is high, the signal voltage is high. When the fuel pressure is low, the signal voltage is low. The fuel pressure regulator has a solenoid supply voltage circuit and a solenoid control circuit. The ECM controls the fuel pressure regulator, which regulates high pressure fuel that goes to the fuel injector rails and the injectors.

OBDII Code P0190 GMC - Fuel Rail Pressure Sensor Circuit Malfunction - AutoCodes.com — P0190 GMC Code - Fuel Rail Pressure Sensor Circuit Malfunction

What does this mean?

What are the Possible Causes of the DTC P0190 GMC?

Low or no fuel
Faulty Rail Pressure (FRP) Sensor
Faulty Rail Pressure (FRP) harness is open or shorted
Faulty Rail Pressure (FRP) circuit poor electrical connection
Faulty Fuel Pump

How to Fix the DTC P0190 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 is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P0190 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 P0190 GMC 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.