Engine-Codes - Generic - P109C

P109C - Open in Fuel Pressure Switching Valve Circuit

Repair Importance Level: 3/3
Repair Difficulty Level: 3/3  What is this?
Table of contents

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 is the P109C code repair?

Start by checking 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.

What is the cost to diagnose the P109C code

Labor: 1.0

The cost to diagnose 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.

Possible Symptoms

  • Engine Light ON (or Service Engine Soon Warning Light)

P109C Meaning

A 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.

More Information

Need more information on how to fix the P109C code?
Get Access to Factory Service Manuals

Information for specific makes

  • P109C LEXUS Open in Fuel Pressure Switching Valve Circuit
  • P109C TOYOTA Open in Fuel Pressure Switching Valve Circuit

Need more help?

Get the P109c code diagnosed by a professional: Find a repair shop in your area