2012 Buick Enclave Fuel Rail Pressure Sensor Reading

P0191 is a common OBD-Two code.  It indicates that the fuel rail pressure sensor is receiving a signal that is outside of its normal range.  This is a generic code, which indicates that information technology has the same pregnant for the Buick Enclave as it would any other vehicle.

P0191 is typically acquired by a bad fuel force per unit area sensor, fuel pressure level regulator, or an issue with the fuel track pressure sensor wiring harness.

P0191 Symptoms:  Buick Enclave

When P0191 is present, there typically are noticeable symptoms.  Drivability is unremarkably afflicted.

Here are the near common symptoms of P0191:

Stalling

If at that place isn't enough fuel pressure getting to the fuel injectors, the engine may stall out or hesitate in sure situations.

Air/Fuel Mixture Bug

Without a reliable reading from the fuel pressure sensor, your Enclave may finish upward with the incorrect air/fuel mixture.  If it runs also rich, you lot may get black smoke and P0172.  If it runs too lean, you're probable to have p0171 accompany P0191.

Unreliable Idle

P0191 can be acquired when the fuel pressure regulator is bad.  If the fuel pressure level at the injectors is inconsistent, it'll be really hard for your Enclave to maintain a steady idle speed.  This can lead to the engine dying when coming to a stop besides.

Poor Fuel Mileage

Fuel mileage can suffer when the air/fuel mixture isn't correct.

P0191 Causes:  Buick Enclave

Hither are the most common problems that cause P0191 to be thrown:

Fuel Pressure Sensor

The fuel pressure sensor is responsible for telling your Enclave'south ECM/PCM what the actual fuel pressure of the vehicle is.  If it goes bad (or if the fuel pressure really is out of the normal range) P0191 can and volition appear.

A bad fuel pressure sensor can forcefulness the vehicle to overwork the fuel pump, thinking that it'south constantly starving for fuel when it is not.

Wiring

Wiring issues can cause P0191 to be thrown.  Accept a look at the wiring harness around the fuel pressure sensor.  Does it wait cleaved or damaged?  Is the connection to the sensor solid?  If it looks bad, it may demand to be replaced.

Fuel Pressure Regulator

The fuel pressure level regulator is responsible for making certain that the amount of fuel pressure level that reaches the fuel rail is at a abiding level (which will exist less than pushed by the fuel pump).  If it goes bad, it tin can restrict the menstruum of fuel to the point that P0191 can be thrown.

Buick Enclave: Bad Fuel Pressure level Regulator Diagnosis

Fuel Pump

A bad fuel pump would deed exactly like a bad fuel pressure level regulator.  Y'all'd notice hesitation and stalling as the fuel pump struggles to keep up with the demands of the engine.  This is typically noticed under heavy engine load.  Or, correct later heavy engine load when the fuel pressure level isn't recovered enough for a proper idle.

Run into Besides:  Buick Enclave: Bad Fuel Pump

P0191 Diagnosis:  Buick Enclave

Hither's a great video from Airtex:

A skillful scanner can help you look at the conditions that were present when the code was set up.  Y'all tin can likewise use it to check the fuel pressure reading as y'all drive.  If the reading seems off, you'll need to manually check the fuel pressure.

If the manual fuel pressure reading is normal, so yous know that yous've got an issue with the fuel pressure sensor (or the wiring going to and from information technology).  If the fuel pressure level reading is low, than you're going to need to effigy out if it's the fuel pump or fuel force per unit area regulator that is causing P0191.

Decision

P0191 can be a hard code to track down, simply should non be ignored.  Doing so very well could leave your Buick Enclave stranded.  If there is anything that you lot would like to add, please leave a comment beneath.  Good luck.

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Source: https://www.700r4transmissionhq.com/p0191-buick-enclave/