car fuel pressure sensor

P0193 Trouble Code – Fuel Rail Pressure Sensor Circuit High Input

In OBD2 Trouble Codes by Magnus Sellén3 Comments

What Does the P0193 Code Mean?

Code P0193 indicates that there is a problem with the Fuel Rail Pressure Sensor. If the Powertrain Control Module (PCM) detects that the Fuel Rail Pressure is outside the specified range, it generates code P0193.

fuel pressure sensor

The PCM relies on the fuel rail pressure sensor to provide the correct information to control the fuel injectors and deliver the required amount of fuel to ensure efficient combustion. The resistance of the fuel rail pressure sensor (FRP) varies with pressure. As the pressure increases, the resistance of the sensor increases and as the pressure decreases, the resistance decreases. This change in resistance affects the voltage at the terminal of the sensor and provides a signal to the PCM. Incorrect fuel rail pressure transmits an incorrect signal to the PCM, generating code P0193.

P0193 Symptoms

  • Check engine light illuminates
  • The engine does not start at all
  • Difficulty in acceleration
  • The engine takes a long time to start
  • Lack of power
  • Fuel consumption increases
  • An abnormal smell coming from the exhaust pipe

Possible Causes

  • Fuel rail pressure (FRP) fails
  • Faulty fuel pump
  • Clogged fuel filter
  • Damaged or corroded wiring
  • Vacuum leak
  • Faulty fuel pressure regulator
SEE NEXT:  P0344 Code: Camshaft Position Sensor - Intermittent

Possible Solutions

  • Ensure the fuel tank is not empty
  • Repair the broken connections
  • Replace the dirty/contaminated fuel filter

How to Diagnose the P0193 Code?

Connect the Car Battery Charger

When diagnosing the P0193 code, the engine of your vehicle should be running. There is a risk that the battery will be discharged, which could lead to the generation of an additional error code. To avoid this problem, buy a car battery chargerir?t=askamastermec 20&l=am2&o=1&a=B004LWVEKS and keep it connected at all times while diagnosing the code.

Connect the OBD2 Scanner

An OBD2 scanner is required to read the information contained in the error code. There are generally two types of OBD2 scanners: a regular code reader, which is available at a low price, and an expensive, advanced scan code, which also contains a number of different functions.

You can also use a multimeter to measure the resistance, but it requires a lot more time and is not recommended.

Disconnect then Reconnect the Car Battery

Sometimes the PCM does strange things that cause the sensors to malfunction. An easy way to fix this problem is to remove the negative terminal of the battery and then reconnect it. This will reset all sensors in the car.

Check the Fuel Pump

To check if the fuel pump is working properly, listen to its sound when starting the car. If the car cannot start but you can hear the fuel pump, the fuel filter is probably clogged and needs to be replaced.

Check for Reference Voltage

If the above steps are successful, the next task is to test the reference voltage of the fuel rail pressure sensor. Start the ignition and then check with a digital volt-ohm meter that the reading shows 5 volts. If the reading does not read close to 5 volts, check the connections again.

Check for Ground Wiring

Often the P0193 error code is generated due to improper ground wiring. To test the ground wiring, connect one end of the jumper cable to a good ground point on the motor and the other end to the negative battery terminal. Check the voltage indicator before and after connecting the jumper cable to see the difference. If you notice a better indication when connecting the jumper cable, there is a grounding problem.

SEE NEXT:  P0014 Code - Meaning, Causes & Symptoms

How to Replace the Fuel Rail Pressure Sensor?

If you prefer to work on your car yourself, you can easily replace the fuel rail pressure sensor at home. However, if you have not yet carried out a replacement procedure, we recommend that you consult a professional mechanic.

Tool required:

  • Socket Wrench
  • Gloves
  • Cleaning cloth
  • Safety glasses

Step 1: Park the Car on a Flat Surface

Ensure that your car is parked on a flat surface with parking gear engaged.

Step 2: Disconnect the Car Battery

Open the hood and locate the negative terminal of the battery. Remove the negative terminal of the battery to ensure that there is no current in the circuit.

Step 3: Locate the Fuel Rail Pressure Sensor

You must remove the engine cover and look for the fuel rail pressure sensor. It is located in the top center of the fuel rail.

Step 4: Remove the Sensor

Remove the fuel rail pressure sensor using a screwdriver or socket wrench. You might have to place a cloth towel over the port and a drip pan under the rail.

Step 5: Clean the Harness

Using an electrical cleaner, clean the harness surrounding the fuel rail sensor.

Step 6: Install a new Sensor

Install the new fuel rail sensor in its place and connect the harness. Make sure to tighten all the screws and bolts so that it remains firmly in place.

Step 6: Reconnect the battery terminal

Reconnect the negative terminal of the battery and start the engine.

Fuel Rail Pressure Sensor Replacement Cost

The average cost of replacing the fuel rail pressure sensor is between $260 and $320. The labor cost is about $200 to $250, while the part itself costs between $60 and $80. Pricing may vary depending on the vehicle and the mechanic’s labor costs.

Should I Repair the P0193 Trouble Code Right Away?

Error code P0193 should be corrected immediately, as it causes driveability problems. If the P0193 code is ignored for too long, the engine may be damaged and at some point, the vehicle may not even start.

SEE NEXT:  P0603 OBD2 Code Internal Control Module Keep Alive Memory Error

Recommended Tools to Fix P0193 Code

Car battery charger
Digital multimeter to test voltage and resistance readings
OBD2 scanner to scan the trouble code. Check this website to find reviews about different OBD2 scanners: AutoZik Diagnostic Tools
Electric cleaner to clean to service the dirty sensor

Further Questions?

If the above-provided solutions do not help with the P0193 trouble code, reach out to us by commenting below and we will get back to you as soon as we can.

3 thoughts on “ P0193 Trouble Code – Fuel Rail Pressure Sensor Circuit High Input ”

  1. Hi Magnus, 2007 Ford F150, crank no start. I have no 5 volt ref from PCM to fuel rail pressure sensor. It does share this5 volt ref with the power steering oil sensor. I have checked the wire from the PCM to the connector at the FRPs and its ok. Back probed the wire to the PCM, no voltage. I say no voltage but i checked it with a test light. I also have no codes. I have disconnected sensors to see if it will give an engine check light or code but none. There is communication though to the scanner/ code reader but says the EVAP is not supported.

    1. Author

      If it doesnt start, check the fuel pressure with a manual gauge and check for spark, ignition. You can also try to see in the scanner if you get any rpms to the PCM while cranking, if not it may be a problem with the timing sync like a crankshaft sensor or camshaft position sensor.

  2. Hi
    I have Ford Figo Titanium 1.4 dura torque .but I am getting P0193 faulty much the cost of this one.please suggest.

  3. Due to very high demand and a high amount of comments, you might have trouble getting your comment answered by me. If you want to get fast answers from a certified automotive technician you should ask your questions here: Ask A Mechanic

Leave a Comment