Sufficient fuel pressure is very important for the efficient working of the engine. The fuel rail pressure sensor is used to measure the fuel pressure inside the fuel rail. It sends fuel pressure data to the powertrain control module (PCM). The diagnostic trouble code (DTC) P0193 gets stored in the error code memory when the PCM detects a too-high signal from the fuel rail pressure sensor. This article mainly explains the P0193 code symptoms, causes, and repair costs.
P0193 Code Definition
P0193 code stands for “Fuel Rail Pressure Sensor “A” Circuit High Input.”
What does the P0193 Code Mean?
Technically, it means that the fuel pressure is more than the pre-calibrated limit for a pre-calibrated time made by the manufacturer.
The fuel pressure sensor measures the fuel pressure inside the fuel rail. It sends this information to the PCM. Your PCM uses the fuel rail pressure data to control the amount of fuel that needs to be delivered to the engine.
If the PCM gets an abnormally high signal from the fuel pressure sensor over a set period, it triggers the P0193 code.
Symptoms of P0193 Code
- Black smoke from the exhaust pipe
- Illuminated Check Engine Light
- The unusual smell from the exhaust pipe
- The vehicle will not start
- Engine stalling
- Problems in starting the vehicle
- Poor acceleration
- Higher consumption of fuel than usual
- Poor engine performance
- Failed emissions test
Read More: Causes of Check Engine Light Illumination
Causes of the P0193 Code
- Insufficient fuel or an empty fuel tank
- Bad fuel pump
- Abnormal fuel pressure
- Corroded, broken, or shorted wiring
- Defective fuel rail pressure sensor
- Clogged or bad fuel filters
- Corroded connectors of the sensor
- Leaking vacuum hoses to fuel pressure regulator
- Bad PCM
Read More: P0191 Code Symptoms and Causes
How to diagnose the P0193 Code?
You need the following tools to diagnose the P0193 code:
- OBD-II Scan Tool
- Fuel Pressure Gauge
- Auto Repair Manual
- Electrical Contact Cleaner
- Basic Hand Tools
Follow the below-given steps to diagnose or fix the P0193 code:
- Use an OBD-II scanner to scan the P0193 code.
- Record all stored fault codes, along with all available freeze frame data. Clear the codes and make a test drive. If the code returns, then move forward for further inspection.
- If the P0193 doesn’t come back immediately, this shows a likelihood of an intermittent problem. Intermittent issues may need to get worse before a proper diagnosis can be made.
- Inspect the fuel pressure sensor connector plug for corrosion.
- Visually inspect the wirings for damage or corrosion.
- Test the fuel pump operation. For this, try to start your car. If your car starts, it means that your fuel pump is working fine. However, if it doesn’t start, it means there is an issue with your pump. To check the fuel pump problem, inspect the fuel pump connector, fuse circuit, and fuel pump relay circuit.
- Use a volt ohmmeter to check the fuel pressure within the fuel pressure sensor. The voltage reading must be 5 volts. If this test is successful, test the ground wire.
- If the fuel pressure is normal, use an oscilloscope to test the wiring and connector of the sensor.
- If your fuel rail pressure sensor is clogged, then clean it.
- If the fuel pressure is bad, replace it with the new one.
- Replace the powertrain control module if needed.
Common P0193 Code Diagnosis Mistakes
- Inability to confirm the presence of the P0193 code.
- Not inspecting the fuel level before other major repairs because an insufficient fuel level is one of the major causes of DTC P0193.
- Clearing the code without first verifying the problem
- Changing the fuel pressure sensor without inspecting the wiring and connections.
- Not inspecting the fuel rail system for a leak before continuing with diagnostics
- Failing to clear the PCM codes after fixing the codes
Repair Cost of P0193 Code
The repair cost of the P0193 code varies according to your vehicle model, labor cost, and the repair of the relevant part. P0193 repair requires one or more below given repairs:
|Fuel pump replacement||$250 to $1,090|
|Fuel rail pressure sensor replacement||$240 to $420|
|Fuel pressure sensor wiring repair||15$ to 80$|
|Fuel pressure regulator replacement||40$ to 170$|
What are the symptoms of a bad fuel rail pressure sensor?
- Check engine light illumination
- A reduction in fuel pressure
- Engine stalling
- A reduction in engine power
- Poor fuel economy
- Vehicle acceleration problems
What happens if the fuel rail pressure sensor fails?
The fuel rail pressure sensor failure badly affects your vehicle’s air-fuel ratio. It badly affects your car’s performance, such as poor fuel economy, poor engine performance, acceleration issues, and stalling.
What repairs can fix the P0193 code?
- Adding fuel to the fuel tank if needed
- Repairing the damaged or shorted wiring
- Cleaning the fuel pressure sensor connector plugs
- Replacing the fuel pressure regulator vacuum hoses
- Repairing or replacing the corrode connectors
- Replacing the clogged fuel filters
- Replacing the bad fuel pump relay
- Replacing the fuel pump fuse
- Replacing the fuel pump
- Replacing the fuel rail pressure sensor
What does a fuel rail pressure sensor do?
The fuel rail pressure sensor is used to measure the fuel pressure inside the fuel rail.
Can a bad fuel pressure sensor cause a misfire?
A faulty sensor can throw off the fuel mixture and cause the engine to experience different issues, such as stalling, misfiring, poor fuel economy, a reduction in power, and poor acceleration.
How serious is the P0193 code?
The P0193 trouble code is considered serious because it may lead to different drivability issues, such as difficulties in starting the vehicle, poor fuel economy, poor engine performance, or engine stalling that makes operating the vehicle difficult, as well as dangerous.