OBD-II Code · Powertrain
P0190
Fuel Rail Pressure Sensor "A" Circuit
Severity
high
Left alone, this one tends to take other parts with it.
Can you drive it
Not for long
Driving on this one risks further damage. Get it to a shop rather than carrying on with it.
Indicative cost (USD)
$150–$700
Varies by vehicle, diagnosis, parts, and local labor. This is not a repair quote.
High-pressure fuel rail pressure sensor circuit fault.
How a shop works this
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed.
Note every code that is set, not just this one.
Codes that appear together usually narrow the cause faster than any one of them read alone.
Read the freeze frame — the conditions the fault was recorded under.
Cold or warm, idle or load, road speed and engine speed. A fault that only appears cold is a different fault from one that only appears under load, even with the same code on the scanner.
Confirm the fault is current rather than history.
Clear the code and see whether it returns under those same conditions. A code that does not come back may have been logged during a repair, a flat battery, or a bad connection that has since been disturbed.
Then work the likely-causes list in the order shown.
That order is what a shop checks first for this code — wiring and connections before the component they run to, because a connector costs nothing to inspect and is a common answer.
If the code comes back after a repair, the underlying fault is still there. That is the point to bring in a scanner with live data and freeze-frame, or a shop that has one.
Common symptoms
- Hard start
- Check engine light
- Stall
Likely causes
- Failed sensorMost common
- Wiring
- Connector
Read the full diagnostic procedureP0190 is a generic-circuit fault on the high-pressure fuel rail pressure (FRP) sensor — the sensor mounted directly on the fuel rail of a direct-inje…
P0190 is a generic-circuit fault on the high-pressure fuel rail pressure (FRP) sensor — the sensor mounted directly on the fuel rail of a direct-injection or common-rail diesel engine that reports actual rail pressure back to the ECU in real time (typical operating ranges: 500-2,200 psi on gas direct-injection, 5,000-30,000 psi on modern common-rail diesels). When P0190 sets, the ECU is seeing a signal it can't reconcile and almost always defaults to limp mode — hard-start, no-start, or severely reduced power — because injection timing and duration depend on knowing rail pressure to within a few percent.
Diagnostic order on a shop floor
- Scan-tool the desired-vs-actual fuel-rail-pressure PIDs at KOEO and at crank — if actual reads zero or pegged max while desired tracks normally, the sensor or its wiring is the suspect; if both desired and actual track together but the ECU still sets P0190, the fault is intermittent.
- Inspect the sensor connector — fuel-rail sensors live in a hot, vibration-heavy environment and the connector seal is often the first thing to fail; pull it, look for corrosion or oil/fuel seepage, and reseat with dielectric grease.
- DMM the 5V reference, ground, and signal wires at the connector with KOEO; a missing 5V reference points to an ECU-side problem and a missing ground points to a harness fault.
- Only after wiring is verified, swap the sensor — they fail internally but it's not the #1 cause. Critical safety note: do NOT crack the sensor port on a common-rail diesel with the engine running or recently shut down — rail pressure can persist long enough to inject diesel through skin under skin-penetration pressure.
Vehicle-specific patterns2003-2007 Ford 6.0L Power Stroke is the classic P0190 vehicle — the high-pressure oil rail sensor (IPR-adjacent on this engine) and the fuel rail pre…
- 2003-2007Ford 6.0L Power Stroke is the classic P0190 vehicle — the high-pressure oil rail sensor (IPR-adjacent on this engine) and the fuel rail pressure sensor are both common failures and Ford issued multiple TSBs; expect $200-$400 installed on a known-good aftermarket sensor like Motorcraft.
- 2008-2010Ford 6.4L Power Stroke and 2011-2019 6.7L Power Stroke also throw P0190 routinely from the rail-pressure sensor itself, often paired with hard-start complaints.
- 2004-2010GM Duramax 6.6L LLY/LBZ/LMM throws P0190 from a fuel-rail pressure sensor failure on the driver-side rail — $150-$250 sensor, accessible with normal hand tools.
- 2010-2016BMW N55 / N20 / N63 turbo direct-injection gas engines throw P0190 from HPFP-adjacent rail sensor failures or from a failing high-pressure pump that can't hit commanded rail pressure (the sensor correctly reports the low value, ECU blames the sensor) — verify pump output before parts-throwing.
- 2013-2018RAM Cummins 6.7L and 2007-2018 Dodge Cummins 6.7L throw P0190 from the rail sensor or from contamination after a CP4-style pump failure that sends metal through the rail. Repair cost typically $150-$700: sensor + connector at the low end; if the underlying cause is a failed high-pressure pump (especially the dreaded CP4 on Power Stroke 6.7L or VW/Audi TDI applications), the real bill climbs to $4,000-$12,000 with full fuel-system contamination cleanup.
Look up another code
P0190 — frequently asked
What does a P0190 code mean?
High-pressure fuel rail pressure sensor circuit fault.
What causes a P0190 code?
Common causes: Failed sensor; Wiring; Connector.
What are the symptoms of a P0190 code?
Typical symptoms: Hard start; Check engine light; Stall.
Is it safe to drive with a P0190 code?
Not for long. Driving on this one risks further damage. Get it to a shop rather than carrying on with it. Estimated repair: $150-$700.
How do I diagnose a P0190 code?
Work from evidence to part, not the other way round. A code names a circuit or a symptom; it does not name the part that failed. 1. Note every code that is set, not just this one. 2. Read the freeze frame — the conditions the fault was recorded under. 3. Confirm the fault is current rather than history. 4. Then work the likely-causes list in the order shown.
More free tools