OBD-II Diagnostic Trouble Code
P0092 — Fuel Pressure Regulator 1 Control Circuit High
P0092 means the ECM saw a higher-than-expected voltage on the control circuit for fuel pressure regulator 1. On common-rail diesels this regulator is usually the fuel inlet metering valve or rail pressure control valve; on gas trucks it is the electronic fuel pressure regulator. A high reading usually points to a short to battery voltage or an open circuit, depending on how the ECM drives the valve.
Severity 4/5
Truck-relevant
Stop within 50 mi
Severity
Stop within 50 mi
Fuel Pressure Regulator 1 Control Circuit High
Code
P0092
Category
Powertrain
Subsystem
Fuel
Truck-relevant
Yes
What this means for truckers
P0092 (Fuel Pressure Regulator 1 Control Circuit High) — same family, opposite end. Wiring or regulator.
Before you replace parts — try this first
P0092 on the Fuel system is most often chafed regulator control wire shorted to battery voltage, or an open in the control or feed wire — not a dead part. On commercial diesels especially, work these in order before spending money on parts:
- Confirm the symptoms. Match what your truck is doing to the Symptoms section below. If the code is set but the symptoms are not there, clear the code and re-test after a drive cycle — it may not return.
- Clean and dry the sensor connector. Water, road salt, or oil seeping into a connector is the #1 fake sensor failure. Disconnect, look for green corrosion or moisture, spray with electrical contact cleaner, dry, reseat. Many faults clear here for $0.
- Inspect the wiring harness. Trace the wire from the sensor toward the ECM — look for chafing against the engine block, melted insulation near the turbo or exhaust, or pinch points where a clamp has rubbed through.
- Test the sensor before swapping it. Most Common Causes (below) list the expected voltage or resistance range — a $20 multimeter saves a $300 sensor swap that does not fix the problem.
- Only then, replace the part. Use the OEM or a tier-1 aftermarket. Cheap sensors throw the same code in two weeks.
Symptoms
Check engine light, often with low power or a derate because the ECM can no longer control fuel pressure. Some trucks will crank long, start hard, stall, or run rough. On common-rail diesels this code often appears with rail pressure codes.
Common causes
- CommonChafed regulator control wire shorted to battery voltage, or an open in the control or feed wire ($100–$450)
- CommonCorroded, loose or water-intruded connector at the regulator/metering valve ($50–$250)
- OccasionalFailed regulator or metering valve coil (internal short or open) ($250–$900)
- RareECM driver circuit fault ($900–$2500)
How to fix
Inspect the regulator harness and connector for chafing, pin spread and corrosion; repair and clear the code
When to use: First step on every P0092, especially after recent engine or fuel system work
Measure regulator coil resistance and compare to the service spec
When to use: When wiring looks good and you need to decide whether the valve is bad
Check the control circuit for a short to battery voltage and for continuity with the regulator and ECM unplugged
When to use: When the coil checks good but the code returns right away
Replace the regulator or metering valve, then confirm rail pressure tracks commanded pressure
When to use: When coil resistance is out of spec or the valve does not respond to an actuator test
Affects most
No specific vehicle pattern found in our complaint database. This code can appear on any vehicle that supports OBD-II diagnostics.
Related
- → Browse all DTC trouble codes
- → Decode a VIN to check codes for your truck
- → Owner-operator maintenance guides
- → P0087 — Fuel Rail/System Pressure Too Low
- → P0088 — Fuel Rail/System Pressure Too High
- → P0089 — Fuel Pressure Regulator Performance
- → P0091 — Fuel Pressure Regulator 1 Control Circuit Low
Frequently Asked Questions
Can I drive with code P0092?
Drive with caution. P0092 is severity 4 — stop within ~50 miles. Most commercial diesel codes at this severity (turbo, fuel rail, transmission solenoid) can damage adjacent expensive components if left unrepaired. Get to a service location before highway-speed loads.
How much does it cost to fix P0092 on a commercial truck?
Total repair cost ranges $50–$2500 depending on the root cause. The cheapest fix is usually the first one listed below — Chafed regulator control wire shorted to battery voltage, or an open in the control or feed wire — which is also the most common. On commercial trucks the cost is usually higher than passenger vehicles due to part availability and shop labor rates ($120–185/hour at most truck shops, vs $90–130 at general auto shops). DIY-capable fixes (sensors, hoses, filters) are at the low end; major component replacements (turbo actuator, high-pressure fuel pump, transmission solenoid pack) are at the high end. Always diagnose with a scan tool BEFORE replacing parts — guessing wrong on a $1,500 turbo actuator when the actual issue was a $30 boost hose is a common expensive mistake.
Will P0092 fail a DOT inspection?
P0092 itself doesn't automatically fail an inspection, but if the truck is in reduced-power mode (limp mode) at the time of inspection, it WILL be flagged. Most inspectors will note the check engine light but pass the truck if it's running and performance is normal. Fix it before a Level 1 inspection regardless.
What's the difference between P0092 and related codes?
P0092 is closely related to: P0087 (Fuel Rail/System Pressure Too Low), P0088 (Fuel Rail/System Pressure Too High), P0089 (Fuel Pressure Regulator Performance), P0091 (Fuel Pressure Regulator 1 Control Circuit Low). These codes share the same subsystem (fuel) and often appear together. If you see this code, scan for the full code list — fixing the root cause usually clears multiple companion codes at once. If only P0092 is set without the companions, the issue is more isolated.
How do I prevent P0092 from coming back after a repair?
For P0092 (Fuel Pressure Regulator 1 Control Circuit High), prevention centers on the fuel system. Replace fuel filters at the OEM interval — don't stretch them. Use only diesel from high-volume fuel stops (avoid bottom-of-tank fuel at low-traffic stations). Add a water separator if you don't have one. After repair, prime the fuel system per the engine manual.