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P0192 is a diagnostic trouble code (DTC) for "Fuel Rail Pressure Sensor Circuit Low Input". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
Fuel rail pressure sensor circuit low input
The power control module (PCM) has detected that the fuel pressure is not within the normal range which is required for proper engine operation.
The mechanic will inspect the fuel rail pressure sensor wiring and connectors. They will check for wires that are burned or shorted and connectors that are corroded. If necessary, replace the connectors and circuitry.
Collects freeze frame data and the trouble codes stored by the power control module (PCM), using an OBD-II scanner
Clears the trouble codes and perform a test drive to see if any codes come back
There could be an intermittent problem if the trouble code P0190 does not return immediately. It may not be possible to diagnose an intermittent problem right away.
If the test drive cannot be performed, it is because the car won’t start. They will then test the fuel pressure with a fuel pressure gauge.
A low fuel pressure reading could be an indication that the vehicle is out of gas. It is important to make sure there is gas in the car during this step in the diagnosis process.
After confirming that there is gas in the car, make sure the fuel pump is operating by listening to it.
If the fuel pump is operating, but the car will not start, this could be an indication that a fuel filter is clogged, there’s an issue with the fuel injector circuits, or that the power control module (PCM) is faulty.
If they cannot hear the fuel pump, they will tap on the fuel tank while simultaneously attempting to start the car. This step will require two people.
If the car starts, this is an indication that the fuel pump is faulty.
If the car does not start, the battery voltage will need to be checked at the fuel pump connector.
If there is no battery voltage reading at the fuel pump connector, the fuse circuit, fuel pump relay circuit, and power control module (PCM) circuit should be inspected. If the fuse, fuel pump relay, and power control module (PCM) circuits are not working properly, inspect the fuel rail pressure sensor.
Test the fuel rail pressure sensor for a reference voltage at the connector with a digital volt ohmmeter. A good reference voltage reading is 5-volts and this should be tested when the car is running.
If the fuel rail pressure sensor has a 5-volt reading, the next step would be to test the sensor ground wire.
If the results show a reference signal and ground signal, the sensor’s resistance will need to be tested. Use the manufacturer’s pressure-to-resistance chart to make a determination as to whether the fuel rail pressure sensor needs to be replaced.
Retest the fuel system to make sure it is working properly. If the circuitry and sensors are operational, it is possible that there is a problem with the power control module (PCM). This is not common, but would require replacing and reprogramming the power control module (PCM).
A common mistake when diagnosing the P0192 trouble code is replacing the fuel rail pressure sensor without inspecting the other components of the system.
Before replacing the fuel rail pressure sensor or any other component of the system, check the fuel level to see if the vehicle has no fuel.
This code is considered serious because of the drivability issues the driver may experience while operating the vehicle.
The car may not start or will struggle to start, and may have poor pick up during acceleration. For these reasons, the P0192 trouble code should be addressed as soon as possible.
It is common for a low fuel level to cause this trouble code. It is important to check the fuel level, inspect all components of the fuel system, and complete all of the necessary diagnostic steps before replacing the fuel rail pressure sensor.
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