P228C - FUEL PRESSURE REGULATOR 1 EXCEEDED CONTROL LIMITS - PRESSURE TOO LOW

The Powertrain Control Module (PCM) electronically controls the fuel pressure regulator via sensor signals. To accomplish this task, the control module makes some adjustments to the battery voltage and ground signal of the regulator while the vehicle is running. Thus, it activates a servomotor that triggers a valve that drives the required fuel pressure. The valve opens as the servomotor voltage increases, which is a step up in pressure.

The diagnostic code P228C OBDII is a code that basically signals the detection of a malfunction in the fuel pressure regulator 1. In this case, the code shows that the voltage in the regulator circuit is excessively below the allowable voltage. Consult the vehicle information source for the application for regulator number 1.

• The Check Engine light turns on.
• Loss of fuel efficiency.
• If the engine is cold, there will be delays in starting the engine.
• Exhaust emissions are increased.

The DTC P228C OBD2 is set for one or more of the following reasons:

• The regulator circuit may be faulty at the connectors or its wiring.
• Possibly the engine oil level is not enough.
• The servomotor may not be synchronized properly.
• The Fuel Pressure Sensor may be in poor condition.
• The fuel pressure regulator could be bad.

Steps to troubleshoot the P228C OBDII fault code:

• First, consult the Technical Service Bulletins.
• Verify the integrity of the wiring and the respective regulator circuit connector. Fix or replace the components that require it.
• Use a multimeter to test the regulator for voltage. Also, check the ground signal for the regulator. If one of these values is not present, there may be a blown fuse. Repair if necessary.