Easy one-page printout for the garage or repair shop
This summary uses the existing diagnostic information shown in full below.
The car's computer is saying that the pressure in the fuel system is not what it should be. It's like when a balloon is too full of air and might pop.
The engine control module (ECM) has detected that the fuel rail pressure is higher than expected, which can affect engine performance.
The P108C code is triggered when the ECM detects a deviation in the fuel rail pressure that exceeds the specified limit. This could be due to a malfunction in the fuel pressure sensor, a blockage in the fuel rail, or an issue with the fuel pump.
• Check engine light on
• Poor engine performance
• Engine stalling
• Faulty fuel pressure sensor
• Blocked fuel rail
• Malfunctioning fuel pump
ECM: Engine Control Module, the computer that controls engine functions.
Fuel Rail: A pipe that delivers fuel to the engine's injectors.
• Check for any other related codes.
• Inspect the fuel pressure sensor and its wiring.
• Measure the actual fuel rail pressure and compare it to the expected value.
• Replace the fuel pressure sensor if faulty.
• Clean or replace the fuel rail if blocked.
• Repair or replace the fuel pump if malfunctioning.
• OBD-II scanner
• Fuel pressure gauge
• Multimeter
$150 - $500
Moderate
• BMW 3 Series
• Audi A4
• Volkswagen Golf
• Regular maintenance of the fuel system
• Use high-quality fuel
• Replace fuel filters as recommended
Engine Performance
• Avoid driving the vehicle until repaired to prevent further damage.
• Schedule a diagnostic check with a professional mechanic.
Check if your vehicle's fuel system components are covered under warranty.
This code has been associated with high-performance vehicles that have sensitive fuel systems.
High – This issue can lead to engine damage if not addressed promptly.
Driving with this code can lead to safety hazards due to potential engine stalling.
• Engine running
• Fuel system under load
The fuel rail is located on the engine, typically near the intake manifold.
Q: Can I drive with the P108C code?
A: It's not recommended to drive as it can cause engine damage.
Q: How is the fuel pressure sensor tested?
A: A multimeter can be used to check the sensor's resistance and voltage output.
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