P0193: Fuel Rail Pressure Sensor "A" Circuit High
P0193 means Fuel Rail Pressure Sensor "A" Circuit High. The fuel rail pressure sensor reports fuel pressure to the engine computer. The signal voltage is higher than the maximum the module expects. Typical causes are an open ground circuit, a signal wire shorted to voltage, an unplugged connector, or a failed sensor.
Can I keep driving? Drivable with care. Diagnose soon: performance, economy or other components can be affected.
Common symptoms
- Check engine light on
- Hesitation or loss of power
- Hard starting
- Possible limp mode
Possible causes
- Failed fuel rail pressure sensor
- Damaged connector or wiring
- 5 V reference circuit fault
- Actual fuel pressure problem (range/performance codes)
How to diagnose P0193
- Compare the sensor reading with a mechanical fuel pressure gauge where possible.
- Check the connector, 5 V reference, ground and signal.
- Look for other sensor codes on the same 5 V reference.
What the code means, digit by digit
Generic codes have the same definition on every OBD-II vehicle (petrol cars from model year 1996 in the US, 2001 in the EU; diesels later). Manufacturers can add their own enhanced codes; those are not listed here.
Related codes
General guidance only. Fault codes describe what the engine computer saw, not which part failed: confirm with testing before replacing parts, and follow the vehicle's service information.