P109C Possible Causes
- Faulty Fuel Pressure Switching Valve
- Fuel Pressure Switching Valve harness is open or shorted
- Fuel Pressure Switching Valve circuit poor electrical connection
- Faulty F/PMP VSV relay
- Faulty Engine Control Module (ECM)
How do I fix code P109C
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.
Cost of diagnosing the P109C code
Labor: 1.0The cost of diagnosing the P109C code is 1.0 hour of labor. The auto repair labor rates vary widely across the country, and even within the same city. Most auto repairs shops charge between $75 and $150 per hour.
P109C Possible Symptoms
- Engine Light ON (or Service Engine Soon Warning Light)
P109C MeaningA Flexible Fuel Vehicle (FFV) can be used with a fuel containing a high concentration of ethyl alcohol.
This FFV uses a fuel pressure switching system which changes the fuel pressure to low or high using a fuel pressure switching valve.
The code is stored when a malfunction is detected in the fuel pressure switching valve circuit. If the voltage of the fuel pressure switching valve circuit is different from the voltage commanded by the Engine Control Module (ECM), the ECM determines that the fuel pressure switching valve circuit is open or shorted, and stores a DTC.
P109C More InformationNeed more information on how to fix the P109C code?
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