Code P0092: Fuel Pressure Regulator 1 Control Circuit High
Definition and Meaning of Code P0092
The P0092 trouble code is a generic powertrain code applicable to most OBD-II equipped vehicles (Dodge, Chrysler, Ford, Toyota, Honda, etc.). It indicates that the Powertrain Control Module (PCM) has detected an abnormally high voltage in the electronic fuel pressure regulator control circuit (often designated by the number 1 on multi-bank engines).
The PCM controls this regulator by adjusting the voltage to operate a servo motor. This motor opens or closes a valve to achieve the optimal fuel pressure, which is monitored in real-time by a sensor located in the injection rail. A voltage that is too high in the control circuit triggers the P0092 code and illuminates the Malfunction Indicator Lamp (MIL) on the dashboard.
Symptoms and Severity of the Fault
This code is considered severe because excessive fuel pressure can damage the engine, the catalytic converter, and impact safety and performance.
Common symptoms include:
- Reduced performance and fuel consumption
- Hard cold starting
- Black smoke from the exhaust
- Appearance of related trouble codes (misfires, idle issues)
Possible Causes of Code P0092
The origins of this problem are multiple:
- Faulty electronic fuel pressure regulator
- Defective fuel pressure sensor
- Wiring problem (short circuit, open circuit, corroded connector)
- Faulty PCM or one requiring a software update
Diagnosis and Repair Procedures
Diagnosis requires an OBD2 scanner, a digital multimeter (DVOM), a suitable fuel pressure gauge, and access to an accurate wiring diagram for your specific vehicle model.
⚠️ Warning: Working on the high-pressure fuel circuit is dangerous. Avoid any sparks or hot surfaces to prevent the risk of fire.
- Visual Inspection: Carefully examine the wiring and connectors, especially on top of the engine, for signs of wear, corrosion, or damage caused by rodents.
- Code Reading: Using the scanner, retrieve all stored codes and freeze frame data. Note them down before clearing them to perform a drive cycle test.
- Electrical Tests: With the ignition on (engine off), use the multimeter to check for battery voltage and a good ground at the regulator connector. Consult the wiring diagram to locate the relevant fuses, relays, and ground points.
- Fuel Pressure Test: Connect the pressure gauge and compare the actual pressure with the manufacturer’s specifications and the live data from the scanner. A discrepancy often indicates a faulty sensor.
- Regulator and Circuit Testing: Disconnect the connector and test the resistance and continuity of the regulator control circuits with a multimeter, following the manufacturer’s specifications.
Related Codes
- P0087: Fuel Rail/System Pressure Too Low
- P0088: Fuel Rail/System Pressure Too High
- P0090: Fuel Pressure Regulator 1 Control Circuit
- P0091: Fuel Pressure Regulator 1 Control Circuit Low
🔧 Need help diagnosing your vehicle? If these procedures are beyond your comfort level, it is highly recommended to consult a professional mechanic equipped with advanced diagnostic tools. An accurate diagnosis helps avoid costly and unnecessary repairs.