P0194

Overview

The P0194 code indicates a fuel rail pressure sensor circuit intermittent condition has been detected by the vehicle's powertrain control module (PCM). This code relates to the fuel delivery and metering system, which is responsible for providing the correct amount of fuel to the engine. When this code is stored, the fuel system is not operating within the expected parameters, which can affect engine performance and fuel economy.

Symptoms

• Loss of power during driving
• Engine stalling or rough idle
• Difficulty starting the engine
• Reduced fuel economy

Common Causes

• Leaking or clogged fuel injectors
• Wiring issues in the fuel system circuit
• Failed fuel pump or weak fuel pressure
• Clogged or dirty fuel filter

Diagnosis Steps

1. 1Connect an OBD-II scanner and read all stored trouble codes and freeze frame data
2. 2Check fuel pressure using a fuel pressure gauge; compare to manufacturer specifications
3. 3Inspect fuel lines, connections, and injectors for leaks or damage
4. 4Test the fuel pressure regulator for proper operation
5. 5Check the fuel pump relay and electrical connections

Estimated Repair Cost

Commonly Affected Vehicles

Related Codes

More Fuel System Codes

Frequently Asked Questions