P0190 Code - Fuel Rail Pressure Sensor Circuit Malfunction

What Does P0190 Mean?

OBD-II Code P0190 is defined as a Fuel Rail Pressure Sensor "A" Circuit

The engine control module (PCM) uses a fuel rail pressure sensor to know how much pressure is going to the fuel injectors. This is so the PCM can effectively control the amount of fuel going through the fuel injectors to maintain desired power and fuel efficiency. If the PCM detects an erratic signal from the fuel pressure sensor, it will set code P0190.

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What are the common causes of P0190 ?

Probable causes include a faulty fuel pump, clogged fuel filter, a low fuel condition, a faulty fuel pump driver/relay, or a defective fuel rail sensor. Open, shorted, damaged, or corroded electrical wiring and/or electrical connectors are also common causes of this code being stored.

How do you troubleshoot P0190 ?

• Checking the fuel level and refilling it with gas if necessary
• Repairing any wires that are broken or wires that have shorted out
• Repairing corroded wiring or connectors
• Replacing a clogged fuel filter
• Replacing the fuel pump relay
• Replacing the fuel pump fuse
• Replacing the fuel pump
• Replacing the fuel rail pressure sensor

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