Parts
$40–120
P0193 — Fuel Rail Pressure Sensor Circuit High
STOPIs it safe to drive? Do not drive — the ECU cannot confirm whether fuel pressure is safe; the engine may run dangerously lean, stall, or sustain injector damage from running without adequate fuel.
What P0193 means
The fuel rail pressure sensor signal is reading above the maximum credible voltage, which the ECU interprets as impossibly high fuel pressure or an open circuit. The ECU may use a default pressure value but fueling accuracy is severely compromised.
Most likely causes (in order)
- Open signal or ground circuit at the fuel rail pressure sensor
- Failed fuel rail pressure sensor ($40–120)
- Damaged wiring harness to the sensor (common near hot exhaust or fuel rail)
- Loose or corroded connector
- Faulty ECU (very rare — rule out everything else first)
Symptoms you might notice
- Check engine light on
- Hard starting or no-start
- Engine stalls or hesitates badly
- Very rough running or misfires
- May not start at all if ECU defaults to zero-fuel command
What to check first
Check the sensor connector first — on direct injection engines especially, the fuel rail wiring sees heat cycling and connectors back out. With key on, measure reference voltage at the sensor (should be ~5V), ground (should be 0V), and signal (should be ~0.5V at key-on before cranking). An open on either the signal or ground will drive the reading high.
Repair cost & difficulty
Labor
0.5–1.5 hr
Difficulty
Moderate
Related codes
P0190P0192