P0193: Fuel rail pressure sensor signal too high
Fuel rail pressure sensor circuit high input
Severity: Inspect soon
PartsAvatar lists reduced power, hesitation and hard starting; fuel rail pressure faults can limit power.
It gets more serious if:
- Stop: Stop driving if the engine stalls or loses power at speed.
P0193 in short
P0193 means the fuel rail pressure sensor signal is higher than the computer expects. That can be a sensor or wiring fault, or truly high fuel pressure from a regulator, pump or restricted filter. Symptoms include reduced power and hesitation, so get it diagnosed soon.
TaT says the computer sees signal voltage above normal. The cause may be the sensor, a short to power, or wiring.
PartsAvatar says the fault can also be real high pressure from the pump, regulator or a clogged filter.
The way to tell is to compare the sensor with a gauge: if the gauge agrees, the problem is in the fuel system; if not, it is the sensor or circuit.
Most likely causes
These are general causes for this code across vehicles. None is specific to one make or model.
Cause 1: Sensor, wiring or connector fault
Common general cause- Why it ranks here
- TaT lists sensor, short to power and wiring.
- What would change this
- Rises if the gauge pressure is normal. Falls if gauge pressure is truly high.
Cause 2: Real high pressure from regulator, pump or filter
Common general cause- Why it ranks here
- PartsAvatar lists the pump, regulator and clogged filter.
- What would change this
- Rises if the gauge confirms high pressure. Falls if the gauge is normal.
Cause 3: Injectors or engine computer
Possible — needs testing- Why it ranks here
- PartsAvatar lists injectors and ECM later.
- What would change this
- Rises if the sensor, wiring and pressure test good. Falls if any fault is found.
What to test first
Start at step 1. Each result tells you what it means and where to go next.
Step 1: Compare the sensor reading with a fuel pressure gauge.
Warning:Fuel systems are pressurised and flammable. Let a shop do it.
IfGauge shows high pressure
It meansLook for pump, regulator or filter problems.
Points to: Real high pressure from regulator, pump or filter
IfGauge is normal but sensor is high
It meansCheck the sensor and wiring.
Step 2: Inspect the sensor wiring and connector, then test the sensor.
Warning:Let a shop do this near the fuel rail.
IfWiring or sensor fault found
It meansRepair it.
IfBoth good
It meansInjectors or computer.
Symptoms
- Check engine light
- Hesitation or reduced power Gets more serious: stop and have it checked.
- Hard starting
- Poor fuel economy
How to fix
On your vehicle
FordYour car
2018 · F-150
Supported by vehicle dataFord bulletin SSM 47337 names P0193. Some 2018 F-150 with the 3.3L engine built before May or June 2018 set a light and rough running with P0192 and/or P0193, possibly from engine harness chafing near the right cylinder head connector. Whether it is still current is not verified.
SSM 47337Status unverified
Engine harness chafing at the cylinder head with P0192 and/or P0193 (F-150 3.3L)
2018f-150 · issued · NHTSA 10143082
Some 2018 F-150 with the 3.3L engine built before May or June 2018 set a light and rough running with P0192 and/or P0193, possibly from engine harness chafing near the right cylinder head connector.
We couldn't confirm whether this bulletin is still current, so it doesn't count as confirmation.
Related codes
P0193 questions
Is the sensor or the fuel system at fault?
Compare the sensor with a gauge. PartsAvatar says if the circuit is intact and real pressure is normal, the sensor is most likely at fault.
Sources and review
- P0193 OBD error code summary
- P0193 fault code entry
- Ford SSM 47337: Engine harness chafing at the cylinder head with P0192 and/or P0193 (F-150 3.3L)
- Last reviewed
- Written by
- Saurabh K.
- Editorial review
- Pending
- Technician review
- Technician review pending
This page explains what a code usually means; it is not a substitute for a professional inspection. How we source and review · Report an error