P0090 Code - Fuel Pressure Regulator 1 Control Circuit

What Does P0090 Mean?

The PCM has detected an abnormal fuel pressure reading that what is required for normal engine operation. This type of code may indicate either a lean or rich condition.

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What are the common causes of P0090 ?

Depending on year, make, and model, DTC P0090 may have number of causes. Here are some of the most common.

• Wire Harness Problem – Poor repair practices, bad wire routing, or other wire harness damage can cause a failure in the FRP regulator circuit.
• FRP Regulator Problem – A faulty solenoid coil in the FRP regulator can cause this problem.

What are the symptoms of P0090 ?

Symptoms typically include a no start condition, extended cranking before engine starts, hesitation upon acceleration, and decreased fuel mileage, along with a stored trouble code and malfunction indicator lamp illumination. Other codes will also likely accompany this type of code including engine misfire codes, lean and/or rich exhaust codes, and mass airflow sensor codes.

How do you troubleshoot P0090 ?

The engine system, in conjuction with the engine control module (ECM)/powertrain control module (PCM), activates the P0090 code solenoid valve to control oil pressure to the engine mechanism that is installed in the valve system to switch valve timing between Low and High.If the engine solenoid valve has an open or short circuit, a DTC is stored.

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