Fuel Pressure Regulator 1 Control Circuit High
The Powertrain Control Module (PCM) monitors the fuel pressure regulator to ensure optimal fuel delivery to the engine. Code P0092 is set when the PCM detects that the voltage in the fuel pressure regulator 1 control circuit is higher than the manufacturer's specified range, often indicating a short to power.
This code requires immediate attention as it can cause severe drivability issues, including stalling or a no-start condition. Driving with improper fuel pressure can also lead to internal engine or catalytic converter damage.
Common symptoms
- Illuminated Check Engine Light
- Engine stalling or hesitation during acceleration
- Hard starting or extended cranking time
- Decreased fuel efficiency
- Black smoke from the tailpipe due to a rich running condition
Likely causes
- Short to voltage in the fuel pressure regulator control circuit wiring
- Faulty fuel pressure regulator (internal short)
- Corroded or damaged electrical connector at the regulator
- Open circuit in the control wiring harness
- Faulty Powertrain Control Module (PCM)
What to check before replacing parts
Visually inspect the fuel pressure regulator wiring harness and connector.
Look for: Look for chafed wires, melted insulation, or corrosion inside the connector that could cause a short to voltage.
Disconnect the fuel pressure regulator and check for voltage at the harness connector with the key on.
Look for: If voltage is present on the control ground circuit when it shouldn't be, there is a short to power in the wiring harness.
Measure the internal resistance of the fuel pressure regulator using a digital multimeter.
Look for: Compare the resistance reading to the manufacturer's specifications; an out-of-limits reading indicates a faulty regulator.
Perform a continuity test on the control circuit between the regulator connector and the PCM.
Look for: A lack of continuity indicates an open circuit in the wiring harness that needs to be repaired.
Check actual fuel pressure using a mechanical gauge.
Look for: Compare the mechanical gauge reading to the desired fuel pressure to confirm if the regulator is physically failing to control pressure.
This page explains the generic P0092 definition and is general reference information, not a diagnosis for your specific vehicle. Actual causes, severity, and repairs vary by make, model, engine, and mileage — always confirm with a scan tool and a qualified technician before replacing parts.
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