P0193

Fuel Rail Pressure Sensor A Circuit High Input

P0193 is a generic OBD-II powertrain diagnostic trouble code: Fuel Rail Pressure Sensor A Circuit High Input. It is logged by the engine control unit when the fuel/inj monitor detects that a specific fault threshold has been exceeded — typically resulting in the malfunction-indicator lamp (MIL / check-engine light) being illuminated.

Code
P0193
Group
Powertrain
System
Fuel/Inj
Severity
Warning (MIL on, possible limp mode)
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What P0193 means

DTC P0193 — Fuel Rail Pressure Sensor A Circuit High Input — is set when the Engine Control Module (ECM) detects a voltage signal from the fuel rail pressure (FRP) sensor that is higher than the expected operating range. On modern common-rail direct injection systems, the FRP sensor provides continuous feedback so the ECM can command the high-pressure fuel pump accordingly; a signal that reads at or near supply voltage indicates an open circuit, short to voltage, or a failed sensor rather than an actual over-pressure condition.

When P0193 is stored, the ECM can no longer trust fuel-rail pressure data and typically substitutes a default value or disables the high-pressure pump, placing the engine in limp-home mode. The code belongs to the P019x family alongside P0190 (circuit malfunction), P0191 (range/performance), and P0192 (circuit low input); P0193 specifically indicates the circuit is reading high, pointing toward an open signal wire, loss of sensor ground, or an internally failed sensor.

Diagnosis should begin with a visual inspection of the sensor wiring harness and connector before condemning the sensor itself.

Common causes

Most-frequently reported root causes when P0193 is logged.

  • 1
    Failed fuel rail pressure sensor (internal open circuit or short to supply voltage)
  • 2
    Open circuit in the sensor signal wire between sensor and ECM
  • 3
    Loss of sensor ground (broken or high-resistance ground path)
  • 4
    Chafed, pinched, or heat-damaged wiring harness near the fuel rail
  • 5
    Corroded, bent, or poorly seated connector pins at the sensor or ECM
  • 6
    Short to voltage on the signal wire (e.g., rubbing against a 12 V supply wire)
  • 7
    Failed or out-of-range ECM reference voltage supply to the sensor

Symptoms drivers notice

MIL (Check Engine light) illuminated
Engine hard to start or fails to start
Significant loss of power and hesitation under acceleration
Reduced fuel economy
Engine may enter limp-home mode with limited RPM or load
Rough idle or engine stall, particularly on vehicles without a secondary port injection system

How to diagnose P0193

A typical diagnostic flow when this code is present.

  1. 1
    Retrieve and record all DTCs; note any companion codes such as P0087 or other P019x codes
  2. 2
    Visually inspect the fuel rail pressure sensor wiring harness for chafing, heat damage, pinching
  3. 3
    With the ignition off, disconnect both the ECM and FRP sensor; use a multimeter to verify wire continuity and absence of shorts
  4. 4
    With the ignition on (KOEO) and only the ECM connected, backprobe the sensor connector and verify the ECM is supplying the correct reference voltage and a clean ground
  5. 5
    Reconnect the sensor and monitor live FRP sensor voltage via a scan tool
  6. 6
    If the circuit tests good but the signal remains high, replace the fuel rail pressure sensor and clear the DTC
  7. 7
    Recheck for DTCs after a full drive cycle

Vehicles where we've handled P0193

Platforms in our catalogue with confirmed P0193 coverage.

AUDI A4 20D
AUDI A6
2015
VW TRANSPORTER
AUDI A7 30D
AUDI A6 30D
2015
AUDI A7

Related powertrain codes

Frequently asked questions

Can I drive with a P0193 code active?

It is not recommended. The ECM may disable or reduce high-pressure fuel pump output, resulting in severe power loss or an inability to start.

Is P0193 always a bad fuel rail pressure sensor?

No. While a failed FRP sensor is the most common cause, an open signal wire, loss of sensor ground, corroded connector, or a short to a voltage source can all produce a high-input reading.

What is the difference between P0192 and P0193?

Both relate to the fuel rail pressure sensor circuit, but P0192 indicates the signal is lower than expected (circuit low input), while P0193 indicates the signal is higher than expected.

Will clearing the code fix the problem?

Clearing the DTC without repairing the underlying fault will only temporarily extinguish the MIL.

Disabling P0193 in software

RaceTune can permanently disable P0193 — and any other OBD-II diagnostic trouble code — on every ECU family we support. The monitor is disabled inside the ECU itself, so the fault stops being logged: the warning light stays off and the engine never enters limp mode for this code. The change is tied to your exact software version.

Permanent
The monitor is disabled in the ECU itself — not just cleared. It cannot return.
Tailored to your file
Each patch is matched to your specific software version — never a one-size-fits-all file.
Reversible
The original file is always preserved. Reflash the stock to return the ECU to factory state.

ECUs with a P0193 disable in our catalogue

Confirmed coverage from our recipe database — we support many more families. Upload your file and our identifier will match it automatically.

  • Bosch EDC17C74 verified 2 software versions
  • Bosch EDC17CP44 verified 1 software version
  • Bosch MD1CS001 verified 1 software version

Software modifications affect emissions compliance and are not road-legal in many jurisdictions. RaceTune service files are intended for motorsport, off-road, and export use.

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