PRC Solenoid Circuit Malfunction
The PRC (Pressure Regulator Control) solenoid isn't responding properly to the engine computer's commands, like a stuck valve that won't open or close when told. This disrupts fuel pressure regulation and can cause poor engine performance.
The ECU monitors the PRC solenoid's electrical circuit and its ability to regulate fuel pressure by measuring voltage/current response and fuel pressure feedback. It expects the solenoid to activate within specific timing windows and maintain proper pressure levels. If resistance is out of range or pressure doesn't respond to solenoid commands, a fault is triggered.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Solenoid Coil Resistance | 4-8 ohms | Open circuit (infinite) or short (0 ohms) |
| Fuel Pressure Response | 35-65 PSI regulated | No pressure change or excessive variation |
Code P1255 is a moderate fault. You can generally drive to a workshop, but avoid long trips or high-load driving (motorway, uphill towing) until it is diagnosed. If the code keeps returning after clearing, or if you notice the symptoms listed above worsening, do not delay professional diagnosis. Many moderate codes have multiple possible root causes — a mechanic with live OBD data can identify the exact fault more efficiently than part-by-part trial and error.
Once the fault is repaired, P1255 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.