Symptoms
Symptoms of a P2541 engine code may include:
- Malfunction indicator light illuminated
- Vehicle unable to start
- Longer than normal cranking times
- Hesitation during acceleration
- Decreased fuel economy
Potential Causes
The potential causes for this code being set are:
- Short to ground in the signal circuit to the FP sensor
- Short to ground in the power circuit of the FP sensor – possible
- Faulty fuel pressure sensor – likely
- Failed PCM – unlikely
Diagnostic and Repair Procedures
A good starting point is always to check for Technical Service Bulletins (TSBs) for your specific vehicle. Your issue may be a known problem with a known fix published by the manufacturer and can save you time and money when diagnosing.
Next, locate the FPS sensor on your specific vehicle. This sensor is typically directly screwed/mounted into the fuel rail, near the injectors and intake manifold. Once located, visually inspect the connector and wiring. Look for chafing, rubbing, bare wires, burns, or melted plastic. Disconnect the connector and carefully inspect the terminals (the metal parts) inside the connector. See if they appear burnt or have a greenish tint indicating corrosion. Use electrical contact cleaner and a plastic-bristled brush if cleaning the terminals is necessary. Allow it to dry and apply electrical grease where the terminals make contact.
If you have a scan tool, clear the diagnostic codes from memory and see if the P2541 code returns. If it does not, the connections were likely your problem.
If the P2541 code returns, we will need to test the FPS sensor and its associated circuits. With the key off, disconnect the electrical connector from the FP sensor. Connect a black wire from the digital voltmeter to the ground terminal at the FP sensor wiring harness connector. Connect the red wire from the digital voltmeter to the power supply terminal at the FP sensor wiring harness connector. Turn the key to the engine off (run) position. Check the manufacturer’s specifications; the voltmeter should read 12 volts or 5 volts. If not, repair the power or ground wire wiring or replace the PCM.
If the previous test is successful, we will need to test the signal wire. With the connector still disconnected, move the red voltmeter wire from the power wire terminal to the signal wire terminal. The voltmeter should now read 5 volts. If not, repair the signal wire or replace the PCM.
If all previous tests are successful and you continue to get a P2541, this would most likely indicate a faulty FPS sensor, although a faulty PCM cannot be ruled out until the FPS sensor has been replaced. If in doubt, seek assistance from a qualified automotive diagnostician. PCMs must be programmed or calibrated to the vehicle to be installed correctly.