High Pressure Fuel Pump harness is open or shorted
High Pressure Fuel Pump electrical circuit poor connection
Faulty High Pressure Fuel Pump
How do I Fix the Code P228C Cadillac?
Check the "Possible Causes" listed above. Visually inspect the related wiring harness and connectors. Check for damaged components and look for broken, bent, pushed out, or corroded connector's pins.
Does your Cadillac have Safety Recalls? → Check here
What is the Cost to Diagnose the Code P228C Cadillac?
Labor: 1.0
The cost of diagnosing the P228C Cadillac code is 1.0 hour of labor. The auto repair labor rates vary by location, your vehicle's make and model, and even your engine type. Most auto repairs shops charge between $75 and $150 per hour.
What are Code P228C Cadillac Possible Symptoms?
Engine Light ON (or Service Engine Soon Warning Light)
Code P228C Cadillac Description
The fuel rail pressure sensor detects fuel pressure within the fuel rail. The Engine Control Module (ECM) provides a 5V reference voltage on the 5V reference circuit and ground on the low reference circuit. The ECM receives a varying signal voltage on the signal circuit.
High pressure fuel is regulated by the high-pressure fuel pump actuator, which is a part of the high-pressure fuel pump. The high-pressure fuel pump actuator is a solenoid valve. The ECM provides a voltage on the actuator high control circuit and ground on the actuator low control circuit. Both circuits are controlled through output drivers within the ECM. When deactivated, both drivers are disabled. When activated, the high control circuit driver energizes the high-pressure fuel pump actuator, and the low control circuit driver Pulse-Width Modulates (PWM) the low control circuit to ground.
The high-pressure mechanical fuel pump is driven by three lobes on the camshaft. The ECM uses the camshaft and crankshaft position sensor inputs to synchronize the high-pressure fuel pump actuator with the position of each of the camshaft lobes. The ECM regulates fuel pressure by adjusting the portion of each pump stroke that provides fuel to the rail.
The ECM monitors the fuel rail fuel pressure sensor and the high-pressure fuel pump actuator to determine if the commanded and actual pressure are within a predetermined range, or if the amount of fuel pressure correction exceeds a calibrated pressure.
The Diagnostic Trouble Code (DTC) will set if the actual fuel rail pressure is 3 MPa (435 psi) less than the desired fuel pressure. The condition exists for greater than 5 s. P228C Cadillac Code - Fuel Pressure Regulator Control Performance Low Pressure
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