Engine-Codes - Generic - P109D

P109D Code - Short in Fuel Pressure Switching Valve Circuit

- Code Popularity: 1,510 Views
- Repair Importance Level: 3/3
- Repair Difficulty Level: 3/3
Table of contents

|What are the Possible Causes of the P109D Code?

  • 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 to Fix the P109D Code?

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 P109D code?

Labor: 1.0

The cost to diagnose the P109D code is 1.0 hour of labor. The auto repair's diagnosis time and labor rates vary by location, vehicle's make and model, and even your engine type. Most auto repair shops charge between $75 and $150 per hour.

|What are P109D code possible symptoms?

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

|What Does the P109D Code Mean?

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.

Short in Fuel Pressure Switching Valve Circuit

|Need more information with the P109D code?

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|P109D code information for specific makes

  • P109D LEXUS Short in Fuel Pressure Switching Valve Circuit
  • P109D TOYOTA Short in Fuel Pressure Switching Valve Circuit

|Need help with a P109D code?

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