P0090 — Fuel Pressure Regulator 1 Control Circuit/Open — 6.7 Powerstroke
Diagnostic reference for 6.7L Power Stroke (2011–present) P0090.
What it means
The PCM has detected an open or fault in the fuel pressure regulator 1 control circuit. On the 6.7L Power Stroke this relates to the pressure/volume control valve circuit at the high-pressure pump and rail.1
Most likely causes
- Open or damaged wiring/connector at the high-pressure pump pressure/volume control valve — Inspect the valve connector and wiring harness at the high-pressure pump and rail for chafing, corrosion, pin push-out, or moisture intrusion that creates an open in the control circuit.1
- Faulty pressure/volume control valve (regulator) on the high-pressure pump — A failed valve or internal coil open can set the control-circuit/open fault; verify valve electrical integrity before condemning wiring.1
- PCM driver or related power/ground issue for the regulator control circuit — Check PCM-related power and ground supplies and the regulator control driver path for opens or high resistance that the PCM interprets as a circuit fault.1
How to diagnose
- Verify code P0090 is present and review freeze-frame for engine conditions at set.
- Visually inspect the pressure/volume control valve connector and wiring at the high-pressure pump and rail for damage, corrosion, or loose pins.
- Check wiring continuity and isolation to/from the PCM for the regulator control circuit; look for chafing near hot or moving components.
- Perform an electrical check of the pressure/volume control valve coil per manufacturer spec to identify an open or out-of-range resistance.
- If wiring and valve test normal, evaluate PCM power/ground and control driver outputs for the regulator circuit before condemning the PCM.
- Clear codes, run a controlled engine start/idle and monitor fuel-pressure control data for rationality and absence of P0090 reset.
Parts and tools you may need
- Digital multimeter
- Wiring diagram for 6.7L Power Stroke fuel pressure control
- Terminal release tools
- Dielectric grease
- Scan tool with live data
Tools you’ll need
- digital multimeter — Checks continuity, isolation, and coil resistance of the pressure/volume control valve circuit to find opens or shorts.
- OBD-II scan tool — Reads P0090, freeze-frame, and live fuel-pressure control data to confirm the fault and monitor rationality after repairs.
- wiring repair kit — Repairs damaged or corroded wiring and connector pins at the high-pressure pump pressure/volume control valve.
- inspection light — Illuminates the high-pressure pump and rail area for visual detection of chafed, melted, or loose wiring and connectors.
Rough cost and difficulty
| Likely repair | Parts | Shop labor | Who usually does it |
|---|---|---|---|
| Wiring or connector repair | $10–$100 | 1–4 hrs | DIY with tools and a manual |
| Fuel pressure control valve (FCA/regulator) | $100–$400 | 0.5–2 hrs | DIY with tools and a manual |
| ECM/PCM replacement (programmed) | $600–$2,000 | 1–3 hrs | Shop |
Typical US independent-shop figures; labor runs about $120–$180 per hour (dealers charge more). Confirm the diagnosis before buying parts.
When to see a pro
High-pressure fuel systems operate at extreme pressures. If diagnosis points to internal pump or rail components, have a qualified diesel technician perform further evaluation. Do not attempt step-by-step repair of high-pressure fuel injection systems. If the vehicle exhibits hard start, loss of power, or stalls, stop driving and seek professional service.
Check for recalls
Recalls are tied to your truck’s VIN, so check yours directly: enter the VIN at NHTSA’s recall lookup. Open safety recalls are repaired free at a dealer.
Sources
Repair videos: P0090 on the 6.7 Power Stroke
Third-party videos, not ours — picked for this engine. Confirm anything against the factory service information for your truck.
Spotted an error, or something missing? Tell us
Run a 6.7 Powerstroke? This goes straight to the editor — it is not published.